| 1 | /* |
| 2 | |
| 3 | Derby - Class org.apache.derby.impl.sql.conn.GenericLanguageConnectionContext |
| 4 | |
| 5 | Copyright 1997, 2004 The Apache Software Foundation or its licensors, as applicable. |
| 6 | |
| 7 | Licensed under the Apache License, Version 2.0 (the "License"); |
| 8 | you may not use this file except in compliance with the License. |
| 9 | You may obtain a copy of the License at |
| 10 | |
| 11 | http://www.apache.org/licenses/LICENSE-2.0 |
| 12 | |
| 13 | Unless required by applicable law or agreed to in writing, software |
| 14 | distributed under the License is distributed on an "AS IS" BASIS, |
| 15 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 16 | See the License for the specific language governing permissions and |
| 17 | limitations under the License. |
| 18 | |
| 19 | */ |
| 20 | |
| 21 | package org.apache.derby.impl.sql.conn; |
| 22 | |
| 23 | import org.apache.derby.iapi.services.context.ContextImpl; |
| 24 | import org.apache.derby.iapi.services.cache.CacheManager; |
| 25 | |
| 26 | import org.apache.derby.impl.sql.compile.CompilerContextImpl; |
| 27 | import org.apache.derby.impl.sql.execute.InternalTriggerExecutionContext; |
| 28 | import org.apache.derby.impl.sql.execute.AutoincrementCounter; |
| 29 | import org.apache.derby.impl.sql.GenericPreparedStatement; |
| 30 | import org.apache.derby.impl.sql.GenericStatement; |
| 31 | import org.apache.derby.iapi.sql.Statement; |
| 32 | import org.apache.derby.impl.sql.conn.CachedStatement; |
| 33 | |
| 34 | import org.apache.derby.iapi.services.property.PropertyUtil; |
| 35 | import org.apache.derby.iapi.services.context.Context; |
| 36 | import org.apache.derby.iapi.services.context.ContextManager; |
| 37 | import org.apache.derby.iapi.services.monitor.Monitor; |
| 38 | import org.apache.derby.iapi.services.sanity.SanityManager; |
| 39 | import org.apache.derby.iapi.services.stream.HeaderPrintWriter; |
| 40 | import org.apache.derby.iapi.services.loader.GeneratedClass; |
| 41 | import org.apache.derby.iapi.services.cache.Cacheable; |
| 42 | import org.apache.derby.iapi.db.Database; |
| 43 | import org.apache.derby.iapi.error.StandardException; |
| 44 | import org.apache.derby.iapi.sql.compile.CompilerContext; |
| 45 | import org.apache.derby.iapi.sql.compile.OptimizerFactory; |
| 46 | import org.apache.derby.iapi.sql.conn.Authorizer; |
| 47 | import org.apache.derby.iapi.error.ExceptionSeverity; |
| 48 | import org.apache.derby.iapi.sql.conn.LanguageConnectionContext; |
| 49 | import org.apache.derby.iapi.sql.conn.LanguageConnectionFactory; |
| 50 | import org.apache.derby.iapi.sql.conn.StatementContext; |
| 51 | import org.apache.derby.iapi.sql.dictionary.ConglomerateDescriptor; |
| 52 | import org.apache.derby.iapi.sql.dictionary.ConglomerateDescriptorList; |
| 53 | import org.apache.derby.iapi.sql.dictionary.DataDictionary; |
| 54 | import org.apache.derby.iapi.sql.dictionary.DataDictionaryContext; |
| 55 | import org.apache.derby.iapi.sql.dictionary.SchemaDescriptor; |
| 56 | import org.apache.derby.iapi.sql.dictionary.TableDescriptor; |
| 57 | import org.apache.derby.iapi.types.DataValueFactory; |
| 58 | import org.apache.derby.iapi.sql.compile.TypeCompilerFactory; |
| 59 | import org.apache.derby.iapi.sql.depend.DependencyManager; |
| 60 | import org.apache.derby.iapi.sql.depend.Provider; |
| 61 | import org.apache.derby.iapi.reference.SQLState; |
| 62 | import org.apache.derby.iapi.reference.Limits; |
| 63 | import org.apache.derby.iapi.sql.execute.ConstantAction; |
| 64 | import org.apache.derby.iapi.sql.execute.CursorActivation; |
| 65 | import org.apache.derby.iapi.sql.execute.ExecPreparedStatement; |
| 66 | import org.apache.derby.iapi.sql.execute.ExecutionContext; |
| 67 | import org.apache.derby.iapi.sql.execute.ExecutionStmtValidator; |
| 68 | import org.apache.derby.iapi.sql.Activation; |
| 69 | import org.apache.derby.iapi.sql.LanguageFactory; |
| 70 | import org.apache.derby.iapi.sql.PreparedStatement; |
| 71 | import org.apache.derby.iapi.sql.ResultSet; |
| 72 | import org.apache.derby.iapi.sql.ParameterValueSet; |
| 73 | |
| 74 | import org.apache.derby.iapi.store.access.TransactionController; |
| 75 | import org.apache.derby.iapi.store.access.AccessFactory; |
| 76 | import org.apache.derby.iapi.store.access.XATransactionController; |
| 77 | import org.apache.derby.iapi.util.IdUtil; |
| 78 | import org.apache.derby.iapi.util.StringUtil; |
| 79 | |
| 80 | import org.apache.derby.catalog.UUID; |
| 81 | import org.apache.derby.iapi.sql.execute.RunTimeStatistics; |
| 82 | import org.apache.derby.iapi.db.TriggerExecutionContext; |
| 83 | import org.apache.derby.iapi.reference.Property; |
| 84 | |
| 85 | import java.util.List; |
| 86 | import java.util.ArrayList; |
| 87 | import java.util.Enumeration; |
| 88 | import java.util.Hashtable; |
| 89 | import java.util.Properties; |
| 90 | import java.util.Vector; |
| 91 | import java.util.Stack; |
| 92 | import java.io.Serializable; |
| 93 | |
| 94 | /** |
| 95 | * LanguageConnectionContext keeps the pool of prepared statements, |
| 96 | * activations, and cursors in use by the current connection. |
| 97 | * <p> |
| 98 | * The generic impl does not provide statement caching. |
| 99 | * |
| 100 | * @author ames |
| 101 | * |
| 102 | */ |
| 103 | public class GenericLanguageConnectionContext |
| 104 | extends ContextImpl |
| 105 | implements LanguageConnectionContext |
| 106 | { |
| 107 | |
| 108 | // make sure these are not zeros |
| 109 | private final static int NON_XA = 0; |
| 110 | private final static int XA_ONE_PHASE = 1; |
| 111 | private final static int XA_TWO_PHASE = 2; |
| 112 | |
| 113 | /* |
| 114 | fields |
| 115 | */ |
| 116 | |
| 117 | private final Vector acts; |
| 118 | protected int bindCount; |
| 119 | private boolean ddWriteMode; |
| 120 | private boolean runTimeStatisticsSetting ; |
| 121 | private boolean statisticsTiming; |
| 122 | |
| 123 | //all the temporary tables declared for this connection |
| 124 | private ArrayList allDeclaredGlobalTempTables; |
| 125 | //The currentSavepointLevel is used to provide the rollback behavior of temporary tables. |
| 126 | //At any point, this variable has the total number of savepoints defined for the transaction. |
| 127 | private int currentSavepointLevel = 0; |
| 128 | |
| 129 | protected long nextCursorId; |
| 130 | |
| 131 | protected int nextSavepointId; |
| 132 | |
| 133 | private RunTimeStatistics runTimeStatisticsObject; |
| 134 | private StringBuffer sb; |
| 135 | |
| 136 | private Database db; |
| 137 | |
| 138 | private final int instanceNumber; |
| 139 | private String drdaID; |
| 140 | private String dbname; |
| 141 | |
| 142 | private int identifierCasing = UNKNOWN_CASING; |
| 143 | |
| 144 | /** |
| 145 | The transaction to use within this language connection context. It may |
| 146 | be more appropriate to have it in a separate context (LanguageTransactionContext?). |
| 147 | REVISIT (nat): I shoehorned the transaction context that |
| 148 | the language uses into this class. The main purpose is so |
| 149 | that the various language code can find out what its |
| 150 | transaction is. |
| 151 | **/ |
| 152 | protected TransactionController tran; |
| 153 | |
| 154 | /** |
| 155 | * If non-null indicates that a nested user transaction is in progress. |
| 156 | */ |
| 157 | protected TransactionController childTransaction; |
| 158 | |
| 159 | /** |
| 160 | * queryNestingDepth is a counter used to keep track of how many calls |
| 161 | * have been made to begin nested transactions. Only the first call |
| 162 | * actually starts a Nested User Transaction with the store. Subsequent |
| 163 | * calls simply increment this counter. commitNestedTransaction only |
| 164 | * decrements the counter and when it drops to 0 actually commits the |
| 165 | * nested user transaction. |
| 166 | */ |
| 167 | protected int queryNestingDepth; |
| 168 | |
| 169 | protected DataValueFactory dataFactory; |
| 170 | protected LanguageFactory langFactory; |
| 171 | protected TypeCompilerFactory tcf; |
| 172 | protected OptimizerFactory of; |
| 173 | protected LanguageConnectionFactory connFactory; |
| 174 | |
| 175 | /* |
| 176 | * A statement context is "pushed" and "popped" at the beginning and |
| 177 | * end of every statement so that only that statement is cleaned up |
| 178 | * on a Statement Exception. As a performance optimization, we only push |
| 179 | * the outermost statement context once, and never pop it. Also, we |
| 180 | * save off a 2nd StatementContext for speeding server side method |
| 181 | * invocation, though we still push and pop it as needed. All other |
| 182 | * statement contexts will allocated and pushed and popped on demand. |
| 183 | */ |
| 184 | private final StatementContext[] statementContexts = new StatementContext[2]; |
| 185 | private int statementDepth; |
| 186 | protected int outermostTrigger = -1; |
| 187 | |
| 188 | protected Authorizer authorizer; |
| 189 | protected String userName = null; //The name the user connects with. |
| 190 | //May still be quoted. |
| 191 | |
| 192 | protected SchemaDescriptor sd; |
| 193 | |
| 194 | // RESOLVE - How do we want to set the default. |
| 195 | private int defaultIsolationLevel = ExecutionContext.READ_COMMITTED_ISOLATION_LEVEL; |
| 196 | protected int isolationLevel = defaultIsolationLevel; |
| 197 | |
| 198 | private boolean isolationLevelExplicitlySet = false; |
| 199 | // Isolation level can be changed using JDBC api Connection.setTransactionIsolation |
| 200 | // or it can be changed using SQL "set current isolation = NEWLEVEL". |
| 201 | // |
| 202 | // In XA transactions, BrokeredConnection keeps isolation state information. |
| 203 | // When isolation is changed in XA transaction using JDBC, that state gets |
| 204 | // correctly set in BrokeredConnection.setTransactionIsolation method. But |
| 205 | // when SQL is used to set the isolation level, the code path is different |
| 206 | // and it does not go through BrokeredConnection's setTransactionIsolation |
| 207 | // method and hence the state is not maintained correctly when coming through |
| 208 | // SQL. To get around this, I am adding following flag which will get set |
| 209 | // everytime the isolation level is set using JDBC or SQL. This flag will be |
| 210 | // checked at global transaction start and end time. If the flag is set to true |
| 211 | // then BrokeredConnection's isolation level state will be brought upto date |
| 212 | // with Real Connection's isolation level and this flag will be set to false |
| 213 | // after that. |
| 214 | private boolean isolationLevelSetUsingSQLorJDBC = false; |
| 215 | |
| 216 | // isolation level to when preparing statements. |
| 217 | // if unspecified, the statement won't be prepared with a specific |
| 218 | // scan isolationlevel |
| 219 | protected int prepareIsolationLevel = ExecutionContext.UNSPECIFIED_ISOLATION_LEVEL; |
| 220 | |
| 221 | // Whether or not to write executing statement info to db2j.log |
| 222 | private boolean logStatementText; |
| 223 | private boolean logQueryPlan; |
| 224 | private HeaderPrintWriter istream; |
| 225 | |
| 226 | // this used to be computed in OptimizerFactoryContextImpl; i.e everytime a |
| 227 | // connection was made. To keep the semantics same I'm putting it out here |
| 228 | // instead of in the OptimizerFactory which is only initialized when the |
| 229 | // database is booted. |
| 230 | private int lockEscalationThreshold; |
| 231 | |
| 232 | private Vector stmtValidators; |
| 233 | private Vector triggerExecutionContexts; |
| 234 | private Vector triggerTables; |
| 235 | |
| 236 | protected AccessFactory af; |
| 237 | |
| 238 | // OptimizerTrace |
| 239 | private boolean optimizerTrace; |
| 240 | private boolean optimizerTraceHtml; |
| 241 | private String lastOptimizerTraceOutput; |
| 242 | private String optimizerTraceOutput; |
| 243 | |
| 244 | //// Support for AUTOINCREMENT |
| 245 | |
| 246 | /** |
| 247 | * To support lastAutoincrementValue: This is a hashtable which maps |
| 248 | * schemaName,tableName,columnName to a Long value. |
| 249 | */ |
| 250 | private Hashtable autoincrementHT; |
| 251 | /** |
| 252 | * whether to allow updates or not. |
| 253 | */ |
| 254 | private boolean autoincrementUpdate; |
| 255 | private long identityVal; //support IDENTITY_VAL_LOCAL function |
| 256 | private boolean identityNotNull; //frugal programmer |
| 257 | |
| 258 | // cache of ai being handled in memory (bulk insert + alter table). |
| 259 | private Hashtable autoincrementCacheHashtable; |
| 260 | |
| 261 | // temp public |
| 262 | public CacheManager statementCache; |
| 263 | |
| 264 | /* |
| 265 | constructor |
| 266 | */ |
| 267 | public GenericLanguageConnectionContext |
| 268 | ( |
| 269 | ContextManager cm, |
| 270 | TransactionController tranCtrl, |
| 271 | |
| 272 | LanguageFactory lf, |
| 273 | LanguageConnectionFactory lcf, |
| 274 | Database db, |
| 275 | String userName, |
| 276 | int instanceNumber, |
| 277 | String drdaID, |
| 278 | String dbname) |
| 279 | throws StandardException |
| 280 | { |
| 281 | super(cm, org.apache.derby.iapi.reference.ContextId.LANG_CONNECTION); |
| 282 | acts = new Vector(); |
| 283 | tran = tranCtrl; |
| 284 | |
| 285 | dataFactory = lcf.getDataValueFactory(); |
| 286 | tcf = lcf.getTypeCompilerFactory(); |
| 287 | of = lcf.getOptimizerFactory(); |
| 288 | langFactory = lf; |
| 289 | connFactory = lcf; |
| 290 | this.db = db; |
| 291 | this.userName = userName; |
| 292 | this.instanceNumber = instanceNumber; |
| 293 | this.drdaID = drdaID; |
| 294 | this.dbname = dbname; |
| 295 | |
| 296 | /* Find out whether or not to log info on executing statements to error log |
| 297 | */ |
| 298 | String logStatementProperty = PropertyUtil.getServiceProperty(getTransactionCompile(), |
| 299 | "derby.language.logStatementText"); |
| 300 | logStatementText = Boolean.valueOf(logStatementProperty).booleanValue(); |
| 301 | |
| 302 | String logQueryPlanProperty = PropertyUtil.getServiceProperty(getTransactionCompile(), |
| 303 | "derby.language.logQueryPlan"); |
| 304 | logQueryPlan = Boolean.valueOf(logQueryPlanProperty).booleanValue(); |
| 305 | |
| 306 | setRunTimeStatisticsMode(logQueryPlan); |
| 307 | |
| 308 | lockEscalationThreshold = |
| 309 | PropertyUtil.getServiceInt(tranCtrl, |
| 310 | Property.LOCKS_ESCALATION_THRESHOLD, |
| 311 | Property.MIN_LOCKS_ESCALATION_THRESHOLD, |
| 312 | Integer.MAX_VALUE, |
| 313 | Property.DEFAULT_LOCKS_ESCALATION_THRESHOLD); |
| 314 | stmtValidators = new Vector(); |
| 315 | triggerExecutionContexts = new Vector(); |
| 316 | triggerTables = new Vector(); |
| 317 | |
| 318 | af = lcf.getAccessFactory(); |
| 319 | statementCache = lcf.getStatementCache(); |
| 320 | } |
| 321 | |
| 322 | public void initialize(boolean sqlConnection) throws StandardException |
| 323 | { |
| 324 | // |
| 325 | //Creating the authorizer authorizes the connection. |
| 326 | authorizer = new GenericAuthorizer(IdUtil.getUserAuthorizationId(userName),this, sqlConnection); |
| 327 | |
| 328 | //we can ignore the following if this is a database connection |
| 329 | //associated with internal thread such as logSniffer and StageTrunc |
| 330 | if(!sqlConnection) |
| 331 | return; |
| 332 | |
| 333 | /* |
| 334 | ** Set the authorization id. User shouldn't |
| 335 | ** be null or else we are going to blow up trying |
| 336 | ** to create a schema for this user. |
| 337 | */ |
| 338 | if (SanityManager.DEBUG) |
| 339 | { |
| 340 | if (getAuthorizationId() == null) |
| 341 | { |
| 342 | SanityManager.THROWASSERT("User name is null," + |
| 343 | " check the connection manager to make sure it is set" + |
| 344 | " reasonably"); |
| 345 | } |
| 346 | } |
| 347 | |
| 348 | |
| 349 | setDefaultSchema(initDefaultSchemaDescriptor()); |
| 350 | } |
| 351 | |
| 352 | protected SchemaDescriptor initDefaultSchemaDescriptor() |
| 353 | throws StandardException { |
| 354 | /* |
| 355 | ** - If the database supports schemas and a schema with the |
| 356 | ** same name as the user's name exists (has been created using |
| 357 | ** create schema already) the database will set the users |
| 358 | ** default schema to the the schema with the same name as the |
| 359 | ** user. |
| 360 | ** - Else Set the default schema to APP. |
| 361 | */ |
| 362 | // SchemaDescriptor sd; |
| 363 | |
| 364 | DataDictionary dd = getDataDictionary(); |
| 365 | String authorizationId = getAuthorizationId(); |
| 366 | |
| 367 | if ( (sd = dd.getSchemaDescriptor(authorizationId, getTransactionCompile(), false)) == null ) |
| 368 | { |
| 369 | sd = new SchemaDescriptor(dd, authorizationId, authorizationId, (UUID) null, false); |
| 370 | } |
| 371 | return sd; |
| 372 | } |
| 373 | |
| 374 | // |
| 375 | // LanguageConnectionContext interface |
| 376 | // |
| 377 | /** |
| 378 | * @see LanguageConnectionContext#getLogStatementText |
| 379 | */ |
| 380 | public boolean getLogStatementText() |
| 381 | { |
| 382 | return logStatementText; |
| 383 | } |
| 384 | |
| 385 | /** |
| 386 | * @see LanguageConnectionContext#setLogStatementText |
| 387 | */ |
| 388 | public void setLogStatementText(boolean logStatementText) |
| 389 | { |
| 390 | this.logStatementText = logStatementText; |
| 391 | } |
| 392 | |
| 393 | /** |
| 394 | * @see LanguageConnectionContext#getLogQueryPlan |
| 395 | */ |
| 396 | public boolean getLogQueryPlan() |
| 397 | { |
| 398 | return logQueryPlan; |
| 399 | } |
| 400 | |
| 401 | /** |
| 402 | * @see LanguageConnectionContext#usesSqlAuthorization |
| 403 | */ |
| 404 | public boolean usesSqlAuthorization() |
| 405 | { |
| 406 | return getDataDictionary().usesSqlAuthorization(); |
| 407 | } |
| 408 | |
| 409 | /** |
| 410 | * get the lock escalation threshold. |
| 411 | */ |
| 412 | public int getLockEscalationThreshold() |
| 413 | { |
| 414 | return lockEscalationThreshold; |
| 415 | } |
| 416 | |
| 417 | /* |
| 418 | The methods that follow are for consistency checking purposes |
| 419 | */ |
| 420 | |
| 421 | public int getCacheSize() { |
| 422 | if (statementCache != null) |
| 423 | return statementCache.getNumberInUse(); |
| 424 | else |
| 425 | return 0; |
| 426 | } |
| 427 | |
| 428 | /** |
| 429 | * Add the activation to those known about by this connection. |
| 430 | */ |
| 431 | public void addActivation(Activation a) { |
| 432 | acts.addElement(a); |
| 433 | |
| 434 | if (SanityManager.DEBUG) { |
| 435 | |
| 436 | if (SanityManager.DEBUG_ON("memoryLeakTrace")) { |
| 437 | |
| 438 | if (acts.size() > 20) |
| 439 | System.out.println("memoryLeakTrace:GenericLanguageContext:activations " + acts.size()); |
| 440 | } |
| 441 | } |
| 442 | } |
| 443 | |
| 444 | /** |
| 445 | * @see LanguageConnectionContext#checkIfAnyDeclaredGlobalTempTablesForThisConnection |
| 446 | */ |
| 447 | public boolean checkIfAnyDeclaredGlobalTempTablesForThisConnection() { |
| 448 | return (allDeclaredGlobalTempTables == null ? false : true); |
| 449 | } |
| 450 | |
| 451 | /** |
| 452 | * @see LanguageConnectionContext#addDeclaredGlobalTempTable |
| 453 | */ |
| 454 | public void addDeclaredGlobalTempTable(TableDescriptor td) |
| 455 | throws StandardException { |
| 456 | |
| 457 | if (findDeclaredGlobalTempTable(td.getName()) != null) //if table already declared, throw an exception |
| 458 | { |
| 459 | throw |
| 460 | StandardException.newException( |
| 461 | SQLState.LANG_OBJECT_ALREADY_EXISTS_IN_OBJECT, |
| 462 | "Declared global temporary table", |
| 463 | td.getName(), |
| 464 | "Schema", |
| 465 | SchemaDescriptor.STD_DECLARED_GLOBAL_TEMPORARY_TABLES_SCHEMA_NAME); |
| 466 | } |
| 467 | |
| 468 | //save all the information about temp table in this special class |
| 469 | TempTableInfo tempTableInfo = new TempTableInfo(td, currentSavepointLevel); |
| 470 | |
| 471 | if (allDeclaredGlobalTempTables == null) |
| 472 | allDeclaredGlobalTempTables = new ArrayList(); |
| 473 | |
| 474 | allDeclaredGlobalTempTables.add(tempTableInfo); |
| 475 | } |
| 476 | |
| 477 | /** |
| 478 | * @see LanguageConnectionContext#dropDeclaredGlobalTempTable |
| 479 | */ |
| 480 | public boolean dropDeclaredGlobalTempTable(String tableName) { |
| 481 | TempTableInfo tempTableInfo = findDeclaredGlobalTempTable(tableName); |
| 482 | if (tempTableInfo != null) |
| 483 | { |
| 484 | if (SanityManager.DEBUG) |
| 485 | if (tempTableInfo.getDeclaredInSavepointLevel() > currentSavepointLevel) |
| 486 | SanityManager.THROWASSERT("declared in savepoint level can not be higher than the current savepoint level"); |
| 487 | |
| 488 | //following checks if the table was declared in the current unit of work. |
| 489 | if (tempTableInfo.getDeclaredInSavepointLevel() == currentSavepointLevel) |
| 490 | { |
| 491 | //since the table was declared in this unit of work, |
| 492 | //the drop table method should remove it from the valid list of temp table for this unit of work |
| 493 | allDeclaredGlobalTempTables.remove(allDeclaredGlobalTempTables.indexOf(tempTableInfo)); |
| 494 | if (allDeclaredGlobalTempTables.size() == 0) |
| 495 | allDeclaredGlobalTempTables = null; |
| 496 | } |
| 497 | else |
| 498 | { |
| 499 | //since the table was not declared in this unit of work, the drop table method will just mark the table as dropped |
| 500 | //in the current unit of work. This information will be used at rollback time. |
| 501 | tempTableInfo.setDroppedInSavepointLevel(currentSavepointLevel); |
| 502 | } |
| 503 | return true; |
| 504 | } else |
| 505 | return false; |
| 506 | } |
| 507 | |
| 508 | /** |
| 509 | * After a release of a savepoint, we need to go through our temp tables list. If there are tables with their declare or drop |
| 510 | * or modified in savepoint levels set to savepoint levels higher than the current savepoint level, then we should change them |
| 511 | * to the current savepoint level |
| 512 | */ |
| 513 | private void tempTablesReleaseSavepointLevels() { |
| 514 | //unlike rollback, here we check for dropped in / declared in / modified in savepoint levels > current savepoint level only. |
| 515 | //This is because the temp tables with their savepoint levels same as currentSavepointLevel have correct value assigned to them and |
| 516 | //do not need to be changed and hence no need to check for >= |
| 517 | for (int i = 0; i < allDeclaredGlobalTempTables.size(); i++) { |
| 518 | TempTableInfo tempTableInfo = (TempTableInfo)allDeclaredGlobalTempTables.get(i); |
| 519 | if (tempTableInfo.getDroppedInSavepointLevel() > currentSavepointLevel) |
| 520 | tempTableInfo.setDroppedInSavepointLevel(currentSavepointLevel); |
| 521 | |
| 522 | if (tempTableInfo.getDeclaredInSavepointLevel() > currentSavepointLevel) |
| 523 | tempTableInfo.setDeclaredInSavepointLevel(currentSavepointLevel); |
| 524 | |
| 525 | if (tempTableInfo.getModifiedInSavepointLevel() > currentSavepointLevel) |
| 526 | tempTableInfo.setModifiedInSavepointLevel(currentSavepointLevel); |
| 527 | } |
| 528 | } |
| 529 | |
| 530 | /** |
| 531 | * do the necessary work at commit time for temporary tables |
| 532 | * 1)If a temporary table was marked as dropped in this transaction, then remove it from the list of temp tables for this connection |
| 533 | * 2)If a temporary table was not dropped in this transaction, then mark it's declared savepoint level and modified savepoint level as -1 |
| 534 | */ |
| 535 | private void tempTablesAndCommit() { |
| 536 | for (int i = allDeclaredGlobalTempTables.size()-1; i >= 0; i--) { |
| 537 | TempTableInfo tempTableInfo = (TempTableInfo)allDeclaredGlobalTempTables.get(i); |
| 538 | if (tempTableInfo.getDroppedInSavepointLevel() != -1) |
| 539 | { |
| 540 | //this means table was dropped in this unit of work and hence should be removed from valid list of temp tables |
| 541 | allDeclaredGlobalTempTables.remove(i); |
| 542 | } else //this table was not dropped in this unit of work, hence set its declaredInSavepointLevel as -1 and also mark it as not modified |
| 543 | { |
| 544 | tempTableInfo.setDeclaredInSavepointLevel(-1); |
| 545 | tempTableInfo.setModifiedInSavepointLevel(-1); |
| 546 | } |
| 547 | } |
| 548 | } |
| 549 | |
| 550 | /** |
| 551 | Reset the connection before it is returned (indirectly) by |
| 552 | a PooledConnection object. See EmbeddedConnection. |
| 553 | */ |
| 554 | public void resetFromPool() |
| 555 | throws StandardException |
| 556 | { |
| 557 | // Reset IDENTITY_VAL_LOCAL |
| 558 | identityNotNull = false; |
| 559 | |
| 560 | // drop all temp tables. |
| 561 | dropAllDeclaredGlobalTempTables(); |
| 562 | } |
| 563 | |
| 564 | /** |
| 565 | * Drop all the declared global temporary tables associated with this connection. This gets called |
| 566 | * when a getConnection() is done on a PooledConnection. This will ensure all the temporary tables |
| 567 | * declared on earlier connection handle associated with this physical database connection are dropped |
| 568 | * before a new connection handle is issued on that same physical database connection. |
| 569 | */ |
| 570 | private void dropAllDeclaredGlobalTempTables() throws StandardException { |
| 571 | if (allDeclaredGlobalTempTables == null) |
| 572 | return; |
| 573 | |
| 574 | DependencyManager dm = getDataDictionary().getDependencyManager(); |
| 575 | StandardException topLevelStandardException = null; |
| 576 | |
| 577 | //collect all the exceptions we might receive while dropping the temporary tables and throw them as one chained exception at the end. |
| 578 | for (int i = 0; i < allDeclaredGlobalTempTables.size(); i++) { |
| 579 | try { |
| 580 | TempTableInfo tempTableInfo = (TempTableInfo)allDeclaredGlobalTempTables.get(i); |
| 581 | TableDescriptor td = tempTableInfo.getTableDescriptor(); |
| 582 | //the following 2 lines of code has been copied from DropTableConstantAction. If there are any changes made there in future, |
| 583 | //we should check if they need to be made here too. |
| 584 | dm.invalidateFor(td, DependencyManager.DROP_TABLE, this); |
| 585 | tran.dropConglomerate(td.getHeapConglomerateId()); |
| 586 | } catch (StandardException e) { |
| 587 | e.setNestedException(topLevelStandardException); |
| 588 | topLevelStandardException = e; |
| 589 | } |
| 590 | } |
| 591 | |
| 592 | allDeclaredGlobalTempTables = null; |
| 593 | try { |
| 594 | internalCommit(true); |
| 595 | } catch (StandardException e) { |
| 596 | e.setNestedException(topLevelStandardException); |
| 597 | topLevelStandardException = e; |
| 598 | } |
| 599 | if (topLevelStandardException != null) throw topLevelStandardException; |
| 600 | } |
| 601 | |
| 602 | //do the necessary work at rollback time for temporary tables |
| 603 | /** |
| 604 | * do the necessary work at rollback time for temporary tables |
| 605 | * 1)If a temp table was declared in the UOW, then drop it and remove it from list of temporary tables. |
| 606 | * 2)If a temp table was declared and dropped in the UOW, then remove it from list of temporary tables. |
| 607 | * 3)If an existing temp table was dropped in the UOW, then recreate it with no data. |
| 608 | * 4)If an existing temp table was modified in the UOW, then get rid of all the rows from the table. |
| 609 | */ |
| 610 | private void tempTablesAndRollback() |
| 611 | throws StandardException { |
| 612 | for (int i = allDeclaredGlobalTempTables.size()-1; i >= 0; i--) { |
| 613 | TempTableInfo tempTableInfo = (TempTableInfo)allDeclaredGlobalTempTables.get(i); |
| 614 | if (tempTableInfo.getDeclaredInSavepointLevel() >= currentSavepointLevel) |
| 615 | { |
| 616 | if (tempTableInfo.getDroppedInSavepointLevel() == -1) |
| 617 | { |
| 618 | //the table was declared but not dropped in the unit of work getting rolled back and hence we will remove |
| 619 | //it from valid list of temporary tables and drop the conglomerate associated with it |
| 620 | TableDescriptor td = tempTableInfo.getTableDescriptor(); |
| 621 | tran.dropConglomerate(td.getHeapConglomerateId()); //remove the conglomerate created for this temp table |
| 622 | allDeclaredGlobalTempTables.remove(i); //remove it from the list of temp tables |
| 623 | } else if (tempTableInfo.getDroppedInSavepointLevel() >= currentSavepointLevel) |
| 624 | { |
| 625 | //the table was declared and dropped in the unit of work getting rolled back |
| 626 | allDeclaredGlobalTempTables.remove(i); |
| 627 | } |
| 628 | } else if (tempTableInfo.getDroppedInSavepointLevel() >= currentSavepointLevel) //this means the table was declared in an earlier savepoint unit / transaction and then dropped in current UOW |
| 629 | { |
| 630 | //restore the old definition of temp table because drop is being rolledback |
| 631 | TableDescriptor td = tempTableInfo.getTableDescriptor(); |
| 632 | td = cleanupTempTableOnCommitOrRollback(td, false); |
| 633 | //In order to store the old conglomerate information for the temp table, we need to replace the |
| 634 | //existing table descriptor with the old table descriptor which has the old conglomerate information |
| 635 | tempTableInfo.setTableDescriptor(td); |
| 636 | tempTableInfo.setDroppedInSavepointLevel(-1); |
| 637 | //following will mark the table as not modified. This is because the table data has been deleted as part of the current rollback |
| 638 | tempTableInfo.setModifiedInSavepointLevel(-1); |
| 639 | allDeclaredGlobalTempTables.set(i, tempTableInfo); |
| 640 | } else if (tempTableInfo.getModifiedInSavepointLevel() >= currentSavepointLevel) //this means the table was declared in an earlier savepoint unit / transaction and modified in current UOW |
| 641 | { |
| 642 | //following will mark the table as not modified. This is because the table data will be deleted as part of the current rollback |
| 643 | tempTableInfo.setModifiedInSavepointLevel(-1); |
| 644 | TableDescriptor td = tempTableInfo.getTableDescriptor(); |
| 645 | getDataDictionary().getDependencyManager().invalidateFor(td, DependencyManager.DROP_TABLE, this); |
| 646 | cleanupTempTableOnCommitOrRollback(td, true); |
| 647 | } // there is no else here because there is no special processing required for temp tables declares in earlier work of unit/transaction and not modified |
| 648 | } |
| 649 | |
| 650 | if (allDeclaredGlobalTempTables.size() == 0) |
| 651 | allDeclaredGlobalTempTables = null; |
| 652 | } |
| 653 | |
| 654 | /** |
| 655 | * This is called at the commit time for temporary tables with ON COMMIT DELETE ROWS |
| 656 | * If a temp table with ON COMMIT DELETE ROWS doesn't have any held cursor open on them, we delete the data from |
| 657 | * them by dropping the conglomerate and recreating the conglomerate. In order to store the new conglomerate |
| 658 | * information for the temp table, we need to replace the existing table descriptor with the new table descriptor |
| 659 | * which has the new conglomerate information |
| 660 | * @param tableName Temporary table name whose table descriptor is getting changed |
| 661 | * @param td New table descriptor for the temporary table |
| 662 | */ |
| 663 | private void replaceDeclaredGlobalTempTable(String tableName, TableDescriptor td) { |
| 664 | TempTableInfo tempTableInfo = findDeclaredGlobalTempTable(tableName); |
| 665 | tempTableInfo.setDroppedInSavepointLevel(-1); |
| 666 | tempTableInfo.setDeclaredInSavepointLevel(-1); |
| 667 | tempTableInfo.setTableDescriptor(td); |
| 668 | allDeclaredGlobalTempTables.set(allDeclaredGlobalTempTables.indexOf(tempTableInfo), tempTableInfo); |
| 669 | } |
| 670 | |
| 671 | /** |
| 672 | * @see LanguageConnectionContext#getTableDescriptorForDeclaredGlobalTempTable |
| 673 | */ |
| 674 | public TableDescriptor getTableDescriptorForDeclaredGlobalTempTable(String tableName) { |
| 675 | TempTableInfo tempTableInfo = findDeclaredGlobalTempTable(tableName); |
| 676 | if (tempTableInfo == null) |
| 677 | return null; |
| 678 | else |
| 679 | return tempTableInfo.getTableDescriptor(); |
| 680 | } |
| 681 | |
| 682 | /** |
| 683 | * Find the declared global temporary table in the list of temporary tables known by this connection. |
| 684 | * @param tableName look for this table name in the saved list |
| 685 | * @return data structure defining the temporary table if found. Else, return null |
| 686 | * |
| 687 | */ |
| 688 | private TempTableInfo findDeclaredGlobalTempTable(String tableName) { |
| 689 | if (allDeclaredGlobalTempTables == null) |
| 690 | return null; |
| 691 | |
| 692 | for (int i = 0; i < allDeclaredGlobalTempTables.size(); i++) { |
| 693 | if (((TempTableInfo)allDeclaredGlobalTempTables.get(i)).matches(tableName)) |
| 694 | return (TempTableInfo)allDeclaredGlobalTempTables.get(i); |
| 695 | } |
| 696 | return null; |
| 697 | } |
| 698 | |
| 699 | /** |
| 700 | * @see LanguageConnectionContext#markTempTableAsModifiedInUnitOfWork |
| 701 | */ |
| 702 | public void markTempTableAsModifiedInUnitOfWork(String tableName) { |
| 703 | TempTableInfo tempTableInfo = findDeclaredGlobalTempTable(tableName); |
| 704 | tempTableInfo.setModifiedInSavepointLevel(currentSavepointLevel); |
| 705 | } |
| 706 | |
| 707 | /** |
| 708 | * @see LanguageConnectionContext#prepareInternalStatement |
| 709 | */ |
| 710 | public PreparedStatement prepareInternalStatement(SchemaDescriptor compilationSchema, String sqlText, boolean isForReadOnly, boolean forMetaData) |
| 711 | throws StandardException |
| 712 | { |
| 713 | return connFactory.getStatement(compilationSchema, sqlText, isForReadOnly).prepare(this, forMetaData); |
| 714 | } |
| 715 | |
| 716 | /** |
| 717 | * @see LanguageConnectionContext#prepareInternalStatement |
| 718 | */ |
| 719 | public PreparedStatement prepareInternalStatement(String sqlText) |
| 720 | throws StandardException |
| 721 | { |
| 722 | return connFactory.getStatement(sd, sqlText, true).prepare(this); |
| 723 | } |
| 724 | |
| 725 | /** |
| 726 | * Remove the activation to those known about by this connection. |
| 727 | * |
| 728 | */ |
| 729 | public void removeActivation(Activation a) |
| 730 | { |
| 731 | if (SanityManager.DEBUG) { |
| 732 | SanityManager.ASSERT(a.isClosed(), "Activation is not closed"); |
| 733 | } |
| 734 | |
| 735 | acts.removeElement(a); |
| 736 | |
| 737 | int capacity = acts.capacity(); |
| 738 | |
| 739 | if (capacity > 20 && (capacity > 2 * acts.size())) { |
| 740 | acts.trimToSize(); |
| 741 | } |
| 742 | } |
| 743 | |
| 744 | /** |
| 745 | * Return the number of activations known for this connection. |
| 746 | * Note that some of these activations may not be in use |
| 747 | * (when a prepared statement is finalized, its activations |
| 748 | * are marked as unused and later closed and removed on |
| 749 | * the next commit/rollback). |
| 750 | */ |
| 751 | public int getActivationCount() { |
| 752 | return acts.size(); |
| 753 | } |
| 754 | |
| 755 | /** |
| 756 | * See if a given cursor is available for use. |
| 757 | * if so return its activation. Returns null if not found. |
| 758 | * For use in execution. |
| 759 | * |
| 760 | * @return the activation for the given cursor, null |
| 761 | * if none was found. |
| 762 | */ |
| 763 | public CursorActivation lookupCursorActivation(String cursorName) { |
| 764 | |
| 765 | int size = acts.size(); |
| 766 | if (size > 0) |
| 767 | { |
| 768 | for (int i = 0; i < size; i++) { |
| 769 | Activation a = (Activation) acts.elementAt(i); |
| 770 | |
| 771 | if (!a.isInUse()) |
| 772 | { |
| 773 | continue; |
| 774 | } |
| 775 | |
| 776 | |
| 777 | |
| 778 | String executingCursorName = a.getCursorName(); |
| 779 | |
| 780 | if (cursorName.equals(executingCursorName)) { |
| 781 | |
| 782 | ResultSet rs = a.getResultSet(); |
| 783 | if (rs == null) |
| 784 | continue; |
| 785 | |
| 786 | // if the result set is closed, the the cursor doesn't exist |
| 787 | if (rs.isClosed()) { |
| 788 | continue; |
| 789 | } |
| 790 | |
| 791 | return (CursorActivation)a; |
| 792 | } |
| 793 | } |
| 794 | } |
| 795 | return null; |
| 796 | } |
| 797 | |
| 798 | /** |
| 799 | * This method will remove a statement from the statement cache. |
| 800 | * It will be called, for example, if there is an exception preparing |
| 801 | * the statement. |
| 802 | * |
| 803 | * @param statement Statement to remove |
| 804 | * @exception StandardException thrown if lookup goes wrong. |
| 805 | */ |
| 806 | public void removeStatement(Statement statement) |
| 807 | throws StandardException { |
| 808 | |
| 809 | if (statementCache == null) |
| 810 | return; |
| 811 | |
| 812 | Cacheable cachedItem = statementCache.findCached(statement); |
| 813 | if (cachedItem != null) |
| 814 | statementCache.remove(cachedItem); |
| 815 | } |
| 816 | |
| 817 | /** |
| 818 | * See if a given statement has already been compiled for this user, and |
| 819 | * if so use its prepared statement. Returns null if not found. |
| 820 | * |
| 821 | * @exception StandardException thrown if lookup goes wrong. |
| 822 | * @return the prepared statement for the given string, null |
| 823 | * if none was found. |
| 824 | */ |
| 825 | public PreparedStatement lookupStatement(GenericStatement statement) |
| 826 | throws StandardException { |
| 827 | |
| 828 | |
| 829 | if (statementCache == null) |
| 830 | return null; |
| 831 | |
| 832 | // statement caching disable when in DDL mode |
| 833 | if (dataDictionaryInWriteMode()) { |
| 834 | return null; |
| 835 | } |
| 836 | |
| 837 | Cacheable cachedItem = statementCache.find(statement); |
| 838 | |
| 839 | CachedStatement cs = (CachedStatement) cachedItem; |
| 840 | |
| 841 | |
| 842 | GenericPreparedStatement ps = cs.getPreparedStatement(); |
| 843 | |
| 844 | synchronized (ps) { |
| 845 | if (ps.upToDate()) { |
| 846 | GeneratedClass ac = ps.getActivationClass(); |
| 847 | |
| 848 | // Check to see if the statement was prepared before some change |
| 849 | // in the class loading set. If this is the case then force it to be invalid |
| 850 | int currentClasses = |
| 851 | getLanguageConnectionFactory().getClassFactory().getClassLoaderVersion(); |
| 852 | |
| 853 | if (ac.getClassLoaderVersion() != currentClasses) { |
| 854 | ps.makeInvalid(DependencyManager.INTERNAL_RECOMPILE_REQUEST, this); |
| 855 | } |
| 856 | |
| 857 | // note that the PreparedStatement is not kept in the cache. This is because |
| 858 | // having items kept in the cache that ultimately are held onto by |
| 859 | // user code is impossible to manage. E.g. an open ResultSet would hold onto |
| 860 | // a PreparedStatement (through its activation) and the user can allow |
| 861 | // this object to be garbage collected. Pushing a context stack is impossible |
| 862 | // in garbage collection as it may deadlock with the open connection and |
| 863 | // the context manager assumes a singel current thread per context stack |
| 864 | } |
| 865 | } |
| 866 | |
| 867 | statementCache.release(cachedItem); |
| 868 | return ps; |
| 869 | } |
| 870 | |
| 871 | /** |
| 872 | Get a connection unique system generated name for a cursor. |
| 873 | */ |
| 874 | public String getUniqueCursorName() |
| 875 | { |
| 876 | return getNameString("SQLCUR", nextCursorId++); |
| 877 | } |
| 878 | |
| 879 | /** |
| 880 | Get a connection unique system generated name for an unnamed savepoint. |
| 881 | */ |
| 882 | public String getUniqueSavepointName() |
| 883 | { |
| 884 | return getNameString("SAVEPT", nextSavepointId++); |
| 885 | } |
| 886 | |
| 887 | /** |
| 888 | Get a connection unique system generated id for an unnamed savepoint. |
| 889 | */ |
| 890 | public int getUniqueSavepointID() |
| 891 | { |
| 892 | return nextSavepointId-1; |
| 893 | } |
| 894 | |
| 895 | /** |
| 896 | * Build a String for a statement name. |
| 897 | * |
| 898 | * @param prefix The prefix for the statement name. |
| 899 | * @param number The number to append for uniqueness |
| 900 | * |
| 901 | * @return A unique String for a statement name. |
| 902 | */ |
| 903 | private String getNameString(String prefix, long number) |
| 904 | { |
| 905 | if (sb != null) |
| 906 | { |
| 907 | sb.setLength(0); |
| 908 | } |
| 909 | else |
| 910 | { |
| 911 | sb = new StringBuffer(); |
| 912 | } |
| 913 | sb.append(prefix).append(number); |
| 914 | |
| 915 | return sb.toString(); |
| 916 | } |
| 917 | |
| 918 | /** |
| 919 | * Do a commit as appropriate for an internally generated |
| 920 | * commit (e.g. as needed by sync, or autocommit). |
| 921 | * |
| 922 | * @param commitStore true if we should commit the Store transaction |
| 923 | * |
| 924 | * @exception StandardException thrown on failure |
| 925 | */ |
| 926 | public void internalCommit(boolean commitStore) throws StandardException |
| 927 | { |
| 928 | doCommit(commitStore, |
| 929 | true, |
| 930 | NON_XA, |
| 931 | false); |
| 932 | } |
| 933 | |
| 934 | /** |
| 935 | * Do a commmit as is appropriate for a user requested |
| 936 | * commit (e.g. a java.sql.Connection.commit() or a language |
| 937 | * 'COMMIT' statement. Does some extra checking to make |
| 938 | * sure that users aren't doing anything bad. |
| 939 | * |
| 940 | * @exception StandardException thrown on failure |
| 941 | */ |
| 942 | public void userCommit() throws StandardException |
| 943 | { |
| 944 | doCommit(true, |
| 945 | true, |
| 946 | NON_XA, |
| 947 | true); |
| 948 | } |
| 949 | |
| 950 | |
| 951 | /** |
| 952 | Commit the language transaction by doing a commitNoSync() |
| 953 | on the store's TransactionController. |
| 954 | |
| 955 | <p> |
| 956 | Do *NOT* tell the data dictionary that the transaction is |
| 957 | finished. The reason is that this would allow other transactions |
| 958 | to see comitted DDL that could be undone in the event of a |
| 959 | system crash. |
| 960 | |
| 961 | @param commitflag the flags to pass to commitNoSync in the store's |
| 962 | TransactionController |
| 963 | |
| 964 | @exception StandardException thrown on failure |
| 965 | */ |
| 966 | public final void internalCommitNoSync(int commitflag) throws StandardException |
| 967 | { |
| 968 | doCommit(true, false, commitflag, false); |
| 969 | } |
| 970 | |
| 971 | |
| 972 | /** |
| 973 | Same as userCommit except commit a distributed transaction. |
| 974 | This commit always commit store and sync the commit. |
| 975 | |
| 976 | @param onePhase if true, allow it to commit without first going thru a |
| 977 | prepared state. |
| 978 | |
| 979 | @exception StandardException thrown if something goes wrong |
| 980 | */ |
| 981 | public final void xaCommit(boolean onePhase) throws StandardException |
| 982 | { |
| 983 | // further overload internalCommit to make it understand 2 phase commit |
| 984 | doCommit(true /* commit store */, |
| 985 | true /* sync */, |
| 986 | onePhase ? XA_ONE_PHASE : XA_TWO_PHASE, |
| 987 | true); |
| 988 | } |
| 989 | |
| 990 | |
| 991 | /** |
| 992 | * This is where the work on internalCommit(), userCOmmit() and |
| 993 | * internalCommitNoSync() actually takes place. |
| 994 | * <p> |
| 995 | * When a commit happens, the language connection context |
| 996 | * will close all open activations/cursors and commit the |
| 997 | * Store transaction. |
| 998 | * <p> |
| 999 | * REVISIT: we talked about having a LanguageTransactionContext, |
| 1000 | * but since store transaction management is currently in flux |
| 1001 | * and our context might want to delegate to that context, |
| 1002 | * for now all commit/rollback actions are handled directly by |
| 1003 | * the language connection context. |
| 1004 | * REVISIT: this may need additional alterations when |
| 1005 | * RELEASE SAVEPOINT/ROLLBACK TO SAVEPOINT show up. |
| 1006 | * <P> |
| 1007 | * Since the access manager's own context takes care of its own |
| 1008 | * resources on commit, and the transaction stays open, there is |
| 1009 | * nothing that this context has to do with the transaction controller. |
| 1010 | * <p> |
| 1011 | * Also, tell the data dictionary that the transaction is finished, |
| 1012 | * if necessary (that is, if the data dictionary was put into |
| 1013 | * DDL mode in this transaction. |
| 1014 | * |
| 1015 | * |
| 1016 | * @param commitStore true if we should commit the Store transaction |
| 1017 | * @param sync true means do a synchronized commit, |
| 1018 | * false means do an unsynchronized commit |
| 1019 | * @param commitflag if this is an unsynchronized commit, the flags to |
| 1020 | * pass to commitNoSync in the store's |
| 1021 | * TransactionController. If this is a synchronized |
| 1022 | * commit, this flag is overloaded for xacommit. |
| 1023 | * @param requestedByUser False iff the commit is for internal use and |
| 1024 | * we should ignore the check to prevent commits |
| 1025 | * in an atomic statement. |
| 1026 | * |
| 1027 | * @exception StandardException Thrown on error |
| 1028 | */ |
| 1029 | |
| 1030 | protected void doCommit(boolean commitStore, |
| 1031 | boolean sync, |
| 1032 | int commitflag, |
| 1033 | boolean requestedByUser) |
| 1034 | throws StandardException |
| 1035 | { |
| 1036 | StatementContext statementContext = getStatementContext(); |
| 1037 | if (requestedByUser && |
| 1038 | (statementContext != null) && |
| 1039 | statementContext.inUse() && |
| 1040 | statementContext.isAtomic()) |
| 1041 | { |
| 1042 | throw StandardException.newException(SQLState.LANG_NO_COMMIT_IN_NESTED_CONNECTION); |
| 1043 | } |
| 1044 | |
| 1045 | // Log commit to error log, if appropriate |
| 1046 | if (logStatementText) |
| 1047 | { |
| 1048 | if (istream == null) |
| 1049 | { |
| 1050 | istream = Monitor.getStream(); |
| 1051 | } |
| 1052 | String xactId = tran.getTransactionIdString(); |
| 1053 | istream.printlnWithHeader(LanguageConnectionContext.xidStr + |
| 1054 | xactId + |
| 1055 | "), " + |
| 1056 | LanguageConnectionContext.lccStr + |
| 1057 | instanceNumber + |
| 1058 | "), " + LanguageConnectionContext.dbnameStr + |
| 1059 | dbname + |
| 1060 | "), " + |
| 1061 | LanguageConnectionContext.drdaStr + |
| 1062 | drdaID + |
| 1063 | "), Committing"); |
| 1064 | } |
| 1065 | |
| 1066 | resetActivations(false); |
| 1067 | |
| 1068 | //do the clean up work required for temporary tables at the commit time. This cleanup work |
| 1069 | //can possibly remove entries from allDeclaredGlobalTempTables and that's why we need to check |
| 1070 | //again later to see if we there are still any entries in allDeclaredGlobalTempTables |
| 1071 | if (allDeclaredGlobalTempTables != null) |
| 1072 | { |
| 1073 | tempTablesAndCommit(); |
| 1074 | //at commit time, for all the temp tables declared with ON COMMIT DELETE ROWS, make sure there are no held cursor open on them. |
| 1075 | //If there are no held cursors open on ON COMMIT DELETE ROWS, drop those temp tables and redeclare them to get rid of all the data in them |
| 1076 | if (allDeclaredGlobalTempTables != null) { |
| 1077 | for (int i=0; i<allDeclaredGlobalTempTables.size(); i++) |
| 1078 | { |
| 1079 | TableDescriptor td = ((TempTableInfo)(allDeclaredGlobalTempTables.get(i))).getTableDescriptor(); |
| 1080 | if (td.isOnCommitDeleteRows() == false) //do nothing for temp table with ON COMMIT PRESERVE ROWS |
| 1081 | { |
| 1082 | continue; |
| 1083 | } |
| 1084 | if (checkIfAnyActivationHasHoldCursor(td.getName()) == false)//temp tables with ON COMMIT DELETE ROWS and no open held cursors |
| 1085 | { |
| 1086 | getDataDictionary().getDependencyManager().invalidateFor(td, DependencyManager.DROP_TABLE, this); |
| 1087 | cleanupTempTableOnCommitOrRollback(td, true); |
| 1088 | } |
| 1089 | } |
| 1090 | } |
| 1091 | } |
| 1092 | |
| 1093 | |
| 1094 | currentSavepointLevel = 0; //reset the current savepoint level for the connection to 0 at the end of commit work for temp tables |
| 1095 | |
| 1096 | // Do *NOT* tell the DataDictionary to start using its cache again |
| 1097 | // if this is an unsynchronized commit. The reason is that it |
| 1098 | // would allow other transactions to see this transaction's DDL, |
| 1099 | // which could be rolled back in case of a system crash. |
| 1100 | if (sync) |
| 1101 | { |
| 1102 | finishDDTransaction(); |
| 1103 | } |
| 1104 | |
| 1105 | // now commit the Store transaction |
| 1106 | TransactionController tc = getTransactionExecute(); |
| 1107 | if ( tc != null && commitStore ) |
| 1108 | { |
| 1109 | if (sync) |
| 1110 | { |
| 1111 | if (commitflag == NON_XA) |
| 1112 | { |
| 1113 | // regular commit |
| 1114 | tc.commit(); |
| 1115 | } |
| 1116 | else |
| 1117 | { |
| 1118 | // This may be a xa_commit, check overloaded commitflag. |
| 1119 | |
| 1120 | if (SanityManager.DEBUG) |
| 1121 | SanityManager.ASSERT(commitflag == XA_ONE_PHASE || |
| 1122 | commitflag == XA_TWO_PHASE, |
| 1123 | "invalid commit flag"); |
| 1124 | |
| 1125 | ((XATransactionController)tc).xa_commit(commitflag == XA_ONE_PHASE); |
| 1126 | |
| 1127 | } |
| 1128 | } |
| 1129 | else |
| 1130 | { |
| 1131 | tc.commitNoSync(commitflag); |
| 1132 | } |
| 1133 | |
| 1134 | // reset the savepoints to the new |
| 1135 | // location, since any outer nesting |
| 1136 | // levels expect there to be a savepoint |
| 1137 | resetSavepoints(); |
| 1138 | } |
| 1139 | } |
| 1140 | |
| 1141 | /** |
| 1142 | * If dropAndRedeclare is true, that means we have come here for temp tables with on commit delete rows |
| 1143 | * and no held curosr open on them. We will drop the existing conglomerate and redeclare a new conglomerate |
| 1144 | * similar to old conglomerate. This is a more efficient way of deleting all rows from the table. |
| 1145 | * |
| 1146 | * If dropAndRedeclare is false, that means we have come here for the rollback cleanup work. We are trying |
| 1147 | * to restore old definition of the temp table (because the drop on it is being rolled back). |
| 1148 | */ |
| 1149 | private TableDescriptor cleanupTempTableOnCommitOrRollback(TableDescriptor td, boolean dropAndRedeclare) |
| 1150 | throws StandardException |
| 1151 | { |
| 1152 | //create new conglomerate with same properties as the old conglomerate and same row template as the old conglomerate |
| 1153 | long conglomId = tran.createConglomerate( |
| 1154 | "heap", // we're requesting a heap conglomerate |
| 1155 | td.getEmptyExecRow(getContextManager()).getRowArray(), // row template |
| 1156 | null, //column sort order - not required for heap |
| 1157 | null, // properties |
| 1158 | (TransactionController.IS_TEMPORARY | TransactionController.IS_KEPT)); |
| 1159 | |
| 1160 | long cid = td.getHeapConglomerateId(); |
| 1161 | |
| 1162 | //remove the old conglomerate descriptor from the table descriptor |
| 1163 | ConglomerateDescriptor cgd = td.getConglomerateDescriptor(cid); |
| 1164 | td.getConglomerateDescriptorList().dropConglomerateDescriptorByUUID(cgd.getUUID()); |
| 1165 | //add the new conglomerate descriptor to the table descriptor |
| 1166 | cgd = getDataDictionary().getDataDescriptorGenerator().newConglomerateDescriptor(conglomId, null, false, null, false, null, td.getUUID(), |
| 1167 | td.getSchemaDescriptor().getUUID()); |
| 1168 | ConglomerateDescriptorList conglomList = td.getConglomerateDescriptorList(); |
| 1169 | conglomList.add(cgd); |
| 1170 | |
| 1171 | //reset the heap conglomerate number in table descriptor to -1 so it will be refetched next time with the new value |
| 1172 | td.resetHeapConglomNumber(); |
| 1173 | |
| 1174 | if(dropAndRedeclare) |
| 1175 | { |
| 1176 | tran.dropConglomerate(cid); //remove the old conglomerate from the system |
| 1177 | replaceDeclaredGlobalTempTable(td.getName(), td); |
| 1178 | } |
| 1179 | |
| 1180 | return(td); |
| 1181 | } |
| 1182 | |
| 1183 | /** |
| 1184 | Do a rollback as appropriate for an internally generated |
| 1185 | rollback (e.g. as needed by sync, or autocommit). |
| 1186 | |
| 1187 | When a rollback happens, we |
| 1188 | close all open activations and invalidate their |
| 1189 | prepared statements. We then tell the cache to |
| 1190 | age out everything else, which effectively invalidates |
| 1191 | them. Thus, all prepared statements will be |
| 1192 | compiled anew on their 1st execution after |
| 1193 | a rollback. |
| 1194 | <p> |
| 1195 | The invalidated statements can revalidate themselves without |
| 1196 | a full recompile if they verify their dependencies' providers still |
| 1197 | exist unchanged. REVISIT when invalidation types are created. |
| 1198 | <p> |
| 1199 | REVISIT: this may need additional alterations when |
| 1200 | RELEASE SAVEPOINT/ROLLBACK TO SAVEPOINT show up. |
| 1201 | <p> |
| 1202 | Also, tell the data dictionary that the transaction is finished, |
| 1203 | if necessary (that is, if the data dictionary was put into |
| 1204 | DDL mode in this transaction. |
| 1205 | |
| 1206 | @exception StandardException thrown on failure |
| 1207 | */ |
| 1208 | |
| 1209 | public void internalRollback() throws StandardException |
| 1210 | { |
| 1211 | doRollback(false /* non-xa */, false); |
| 1212 | } |
| 1213 | |
| 1214 | /** |
| 1215 | * Do a rollback as is appropriate for a user requested |
| 1216 | * rollback (e.g. a java.sql.Connection.rollback() or a language |
| 1217 | * 'ROLLBACk' statement. Does some extra checking to make |
| 1218 | * sure that users aren't doing anything bad. |
| 1219 | * |
| 1220 | * @exception StandardException thrown on failure |
| 1221 | */ |
| 1222 | public void userRollback() throws StandardException |
| 1223 | { |
| 1224 | doRollback(false /* non-xa */, true); |
| 1225 | } |
| 1226 | |
| 1227 | /** |
| 1228 | Same as userRollback() except rolls back a distrubuted transaction. |
| 1229 | |
| 1230 | @exception StandardException thrown if something goes wrong |
| 1231 | */ |
| 1232 | public void xaRollback() throws StandardException |
| 1233 | { |
| 1234 | doRollback(true /* xa */, true); |
| 1235 | } |
| 1236 | |
| 1237 | /** |
| 1238 | * When a rollback happens, the language connection context |
| 1239 | * will close all open activations and invalidate |
| 1240 | * their prepared statements. Then the language will abort the |
| 1241 | * Store transaction. |
| 1242 | * <p> |
| 1243 | * The invalidated statements can revalidate themselves without |
| 1244 | * a full recompile if they verify their dependencies' providers still |
| 1245 | * exist unchanged. REVISIT when invalidation types are created. |
| 1246 | * <p> |
| 1247 | * REVISIT: this may need additional alterations when |
| 1248 | * RELEASE SAVEPOINT/ROLLBACK TO SAVEPOINT show up. |
| 1249 | * <p> |
| 1250 | * Also, tell the data dictionary that the transaction is finished, |
| 1251 | * if necessary (that is, if the data dictionary was put into |
| 1252 | * DDL mode in this transaction. |
| 1253 | * |
| 1254 | * @param xa true if this is an xa rollback |
| 1255 | * @param requestedByUser true if requested by user |
| 1256 | * |
| 1257 | * @exception StandardException thrown on failure |
| 1258 | */ |
| 1259 | private void doRollback(boolean xa, boolean requestedByUser) throws StandardException |
| 1260 | { |
| 1261 | StatementContext statementContext = getStatementContext(); |
| 1262 | if (requestedByUser && |
| 1263 | (statementContext != null) && |
| 1264 | statementContext.inUse() && |
| 1265 | statementContext.isAtomic()) |
| 1266 | { |
| 1267 | throw StandardException.newException(SQLState.LANG_NO_ROLLBACK_IN_NESTED_CONNECTION); |
| 1268 | } |
| 1269 | |
| 1270 | // Log rollback to error log, if appropriate |
| 1271 | if (logStatementText) |
| 1272 | { |
| 1273 | if (istream == null) |
| 1274 | { |
| 1275 | istream = Monitor.getStream(); |
| 1276 | } |
| 1277 | String xactId = tran.getTransactionIdString(); |
| 1278 | istream.printlnWithHeader(LanguageConnectionContext.xidStr + |
| 1279 | xactId + |
| 1280 | "), " + |
| 1281 | LanguageConnectionContext.lccStr + |
| 1282 | instanceNumber + |
| 1283 | "), " + LanguageConnectionContext.dbnameStr + |
| 1284 | dbname + |
| 1285 | "), " + |
| 1286 | LanguageConnectionContext.dbnameStr + |
| 1287 | dbname + |
| 1288 | "), " + |
| 1289 | LanguageConnectionContext.drdaStr + |
| 1290 | drdaID + |
| 1291 | "), Rolling back"); |
| 1292 | } |
| 1293 | |
| 1294 | resetActivations(true); |
| 1295 | |
| 1296 | currentSavepointLevel = 0; //reset the current savepoint level for the connection to 0 at the beginning of rollback work for temp tables |
| 1297 | if (allDeclaredGlobalTempTables != null) |
| 1298 | tempTablesAndRollback(); |
| 1299 | |
| 1300 | finishDDTransaction(); |
| 1301 | |
| 1302 | // now rollback the Store transaction |
| 1303 | TransactionController tc = getTransactionExecute(); |
| 1304 | if (tc != null) |
| 1305 | { |
| 1306 | if (xa) |
| 1307 | ((XATransactionController)tc).xa_rollback(); |
| 1308 | else |
| 1309 | tc.abort(); |
| 1310 | // reset the savepoints to the new |
| 1311 | // location, since any outer nesting |
| 1312 | // levels expet there to be a savepoint |
| 1313 | resetSavepoints(); |
| 1314 | } |
| 1315 | } |
| 1316 | |
| 1317 | /** |
| 1318 | * Reset all statement savepoints. Traverses the StatementContext |
| 1319 | * stack from bottom to top, calling resetSavePoint() |
| 1320 | * on each element. |
| 1321 | * |
| 1322 | * @exception StandardException thrown if something goes wrong |
| 1323 | */ |
| 1324 | private void resetSavepoints() throws StandardException |
| 1325 | { |
| 1326 | final ContextManager cm = getContextManager(); |
| 1327 | final List stmts = cm.getContextStack(org.apache.derby. |
| 1328 | iapi.reference. |
| 1329 | ContextId.LANG_STATEMENT); |
| 1330 | final int end = stmts.size(); |
| 1331 | for (int i = 0; i < end; ++i) { |
| 1332 | ((StatementContext)stmts.get(i)).resetSavePoint(); |
| 1333 | } |
| 1334 | } |
| 1335 | |
| 1336 | /** |
| 1337 | * Let the context deal with a rollback to savepoint |
| 1338 | * |
| 1339 | * @param savepointName Name of the savepoint that needs to be rolled back |
| 1340 | * @param refreshStyle boolean indicating whether or not the controller should close |
| 1341 | * open conglomerates and scans. Also used to determine if language should close |
| 1342 | * open activations. |
| 1343 | * @param kindOfSavepoint A NULL value means it is an internal savepoint (ie not a user defined savepoint) |
| 1344 | * Non NULL value means it is a user defined savepoint which can be a SQL savepoint or a JDBC savepoint |
| 1345 | * A String value for kindOfSavepoint would mean it is SQL savepoint |
| 1346 | * A JDBC Savepoint object value for kindOfSavepoint would mean it is JDBC savepoint |
| 1347 | * |
| 1348 | * @exception StandardException thrown if something goes wrong |
| 1349 | */ |
| 1350 | public void internalRollbackToSavepoint( String savepointName, boolean refreshStyle, Object kindOfSavepoint ) |
| 1351 | throws StandardException |
| 1352 | { |
| 1353 | // now rollback the Store transaction to the savepoint |
| 1354 | TransactionController tc = getTransactionExecute(); |
| 1355 | if (tc != null) |
| 1356 | { |
| 1357 | boolean closeConglomerates; |
| 1358 | |
| 1359 | if ( refreshStyle ) |
| 1360 | { |
| 1361 | closeConglomerates = true; |
| 1362 | // bug 5145 - don't forget to close the activations while rolling |
| 1363 | // back to a savepoint |
| 1364 | resetActivations(true); |
| 1365 | } |
| 1366 | else { closeConglomerates = false; } |
| 1367 | |
| 1368 | currentSavepointLevel = tc.rollbackToSavePoint( savepointName, closeConglomerates, kindOfSavepoint ); |
| 1369 | } |
| 1370 | |
| 1371 | if (tc != null && refreshStyle && allDeclaredGlobalTempTables != null) |
| 1372 | tempTablesAndRollback(); |
| 1373 | } |
| 1374 | |
| 1375 | /** |
| 1376 | Let the context deal with a release of a savepoint |
| 1377 | |
| 1378 | @param savepointName Name of the savepoint that needs to be released |
| 1379 | @param kindOfSavepoint A NULL value means it is an internal savepoint (ie not a user defined savepoint) |
| 1380 | Non NULL value means it is a user defined savepoint which can be a SQL savepoint or a JDBC savepoint |
| 1381 | A String value for kindOfSavepoint would mean it is SQL savepoint |
| 1382 | A JDBC Savepoint object value for kindOfSavepoint would mean it is JDBC savepoint |
| 1383 | |
| 1384 | @exception StandardException thrown if something goes wrong |
| 1385 | */ |
| 1386 | public void releaseSavePoint( String savepointName, Object kindOfSavepoint ) throws StandardException |
| 1387 | { |
| 1388 | TransactionController tc = getTransactionExecute(); |
| 1389 | if (tc != null) |
| 1390 | { |
| 1391 | currentSavepointLevel = tc.releaseSavePoint( savepointName, kindOfSavepoint ); |
| 1392 | //after a release of a savepoint, we need to go through our temp tables list. |
| 1393 | if (allDeclaredGlobalTempTables != null) |
| 1394 | tempTablesReleaseSavepointLevels(); |
| 1395 | } |
| 1396 | } |
| 1397 | |
| 1398 | /** |
| 1399 | Sets a savepoint. Causes the Store to set a savepoint. |
| 1400 | |
| 1401 | @param savepointName name of savepoint |
| 1402 | @param kindOfSavepoint A NULL value means it is an internal savepoint (ie not a user defined savepoint) |
| 1403 | Non NULL value means it is a user defined savepoint which can be a SQL savepoint or a JDBC savepoint |
| 1404 | A String value for kindOfSavepoint would mean it is SQL savepoint |
| 1405 | A JDBC Savepoint object value for kindOfSavepoint would mean it is JDBC savepoint |
| 1406 | |
| 1407 | @exception StandardException thrown if something goes wrong |
| 1408 | */ |
| 1409 | public void languageSetSavePoint( String savepointName, Object kindOfSavepoint ) throws StandardException |
| 1410 | { |
| 1411 | TransactionController tc = getTransactionExecute(); |
| 1412 | if (tc != null) |
| 1413 | { |
| 1414 | currentSavepointLevel = tc.setSavePoint( savepointName, kindOfSavepoint ); |
| 1415 | } |
| 1416 | } |
| 1417 | |
| 1418 | /** |
| 1419 | * Return true if any transaction is blocked, even if not by this one |
| 1420 | * |
| 1421 | */ |
| 1422 | public boolean anyoneBlocked() |
| 1423 | { |
| 1424 | return getTransactionExecute().anyoneBlocked(); |
| 1425 | } |
| 1426 | |
| 1427 | /** |
| 1428 | Sets the transaction controller to use with this language connection |
| 1429 | context. |
| 1430 | |
| 1431 | @param tran the transaction to use with this language connection context |
| 1432 | */ |
| 1433 | public void setTransaction( TransactionController tran ) { this.tran = tran; } |
| 1434 | |
| 1435 | |
| 1436 | /** |
| 1437 | * Start a Nested User Transaction (NUT) with the store. If a NUT is |
| 1438 | * already active simply increment a counter, queryNestingDepth, to keep |
| 1439 | * track of how many times we have tried to start a NUT. |
| 1440 | */ |
| 1441 | public void beginNestedTransaction(boolean readOnly) throws StandardException |
| 1442 | { |
| 1443 | if (childTransaction == null) |
| 1444 | childTransaction = tran.startNestedUserTransaction(readOnly); |
| 1445 | queryNestingDepth++; |
| 1446 | return; |
| 1447 | } |
| 1448 | |
| 1449 | public void commitNestedTransaction() |
| 1450 | throws StandardException |
| 1451 | { |
| 1452 | if (--queryNestingDepth == 0) |
| 1453 | { |
| 1454 | childTransaction.commit(); |
| 1455 | childTransaction.destroy(); |
| 1456 | childTransaction = null; |
| 1457 | return; |
| 1458 | } |
| 1459 | } |
| 1460 | |
| 1461 | /** |
| 1462 | * Get the transaction controller to use at compile time with this language |
| 1463 | * connection context. If a NUT is active then return NUT else return parent |
| 1464 | * transaction. |
| 1465 | */ |
| 1466 | public TransactionController getTransactionCompile() |
| 1467 | { |
| 1468 | return (childTransaction != null) ? childTransaction : tran; |
| 1469 | } |
| 1470 | |
| 1471 | public TransactionController getTransactionExecute() |
| 1472 | { |
| 1473 | return tran; |
| 1474 | } |
| 1475 | |
| 1476 | /** Get the data value factory to use with this language connection |
| 1477 | context. |
| 1478 | */ |
| 1479 | public DataValueFactory getDataValueFactory() { |
| 1480 | return dataFactory; |
| 1481 | } |
| 1482 | |
| 1483 | /** |
| 1484 | Get the language factory to use with this language connection |
| 1485 | context. |
| 1486 | */ |
| 1487 | public LanguageFactory getLanguageFactory() { |
| 1488 | return langFactory; |
| 1489 | } |
| 1490 | |
| 1491 | public OptimizerFactory getOptimizerFactory() { |
| 1492 | return of; |
| 1493 | } |
| 1494 | |
| 1495 | /** |
| 1496 | Get the language connection factory to use with this language connection |
| 1497 | context. |
| 1498 | */ |
| 1499 | public LanguageConnectionFactory getLanguageConnectionFactory() { |
| 1500 | return connFactory; |
| 1501 | } |
| 1502 | |
| 1503 | /** |
| 1504 | * check if there are any activations that reference this temporary table |
| 1505 | * @param tableName look for any activations referencing this table name |
| 1506 | * @return boolean false if found no activations |
| 1507 | */ |
| 1508 | private boolean checkIfAnyActivationHasHoldCursor(String tableName) |
| 1509 | throws StandardException |
| 1510 | { |
| 1511 | for (int i = acts.size() - 1; i >= 0; i--) { |
| 1512 | Activation a = (Activation) acts.elementAt(i); |
| 1513 | if (a.checkIfThisActivationHasHoldCursor(tableName)) |
| 1514 | return true; |
| 1515 | } |
| 1516 | return false; |
| 1517 | } |
| 1518 | |
| 1519 | |
| 1520 | /** |
| 1521 | * Verify that there are no activations with open held result sets. |
| 1522 | * |
| 1523 | * @return boolean Found no open (held) resultsets. |
| 1524 | * |
| 1525 | * @exception StandardException thrown on failure |
| 1526 | */ |
| 1527 | /* This gets used in case of hold cursors. If there are any hold cursors open |
| 1528 | * then user can't change the isolation level without closing them. At the |
| 1529 | * execution time, set transaction isolation level calls this method before |
| 1530 | * changing the isolation level. |
| 1531 | */ |
| 1532 | public boolean verifyAllHeldResultSetsAreClosed() |
| 1533 | throws StandardException |
| 1534 | { |
| 1535 | boolean seenOpenResultSets = false; |
| 1536 | |
| 1537 | /* For every activation */ |
| 1538 | for (int i = acts.size() - 1; i >= 0; i--) { |
| 1539 | |
| 1540 | Activation a = (Activation) acts.elementAt(i); |
| 1541 | |
| 1542 | if (SanityManager.DEBUG) |
| 1543 | { |
| 1544 | SanityManager.ASSERT(a instanceof CursorActivation, "a is not a CursorActivation"); |
| 1545 | } |
| 1546 | |
| 1547 | if (!a.isInUse()) |
| 1548 | { |
| 1549 | continue; |
| 1550 | } |
| 1551 | |
| 1552 | if (!a.getResultSetHoldability()) |
| 1553 | { |
| 1554 | continue; |
| 1555 | } |
| 1556 | |
| 1557 | ResultSet rs = ((CursorActivation) a).getResultSet(); |
| 1558 | |
| 1559 | /* is there an open result set? */ |
| 1560 | if ((rs != null) && !rs.isClosed() && rs.returnsRows()) |
| 1561 | { |
| 1562 | seenOpenResultSets = true; |
| 1563 | break; |
| 1564 | } |
| 1565 | } |
| 1566 | |
| 1567 | if (!seenOpenResultSets) |
| 1568 | return(true); |
| 1569 | |
| 1570 | // There may be open ResultSet's that are yet to be garbage collected |
| 1571 | // let's try and force these out rather than throw an error |
| 1572 | System.gc(); |
| 1573 | System.runFinalization(); |
| 1574 | |
| 1575 | |
| 1576 | /* For every activation */ |
| 1577 | for (int i = acts.size() - 1; i >= 0; i--) { |
| 1578 | |
| 1579 | Activation a = (Activation) acts.elementAt(i); |
| 1580 | |
| 1581 | if (SanityManager.DEBUG) |
| 1582 | { |
| 1583 | SanityManager.ASSERT(a instanceof CursorActivation, "a is not a CursorActivation"); |
| 1584 | } |
| 1585 | |
| 1586 | if (!a.isInUse()) |
| 1587 | { |
| 1588 | continue; |
| 1589 | } |
| 1590 | |
| 1591 | if (!a.getResultSetHoldability()) |
| 1592 | { |
| 1593 | continue; |
| 1594 | } |
| 1595 | |
| 1596 | ResultSet rs = ((CursorActivation) a).getResultSet(); |
| 1597 | |
| 1598 | /* is there an open held result set? */ |
| 1599 | if ((rs != null) && !rs.isClosed() && rs.returnsRows()) |
| 1600 | { |
| 1601 | return(false); |
| 1602 | } |
| 1603 | } |
| 1604 | return(true); |
| 1605 | } |
| 1606 | |
| 1607 | /** |
| 1608 | * Verify that there are no activations with open result sets |
| 1609 | * on the specified prepared statement. |
| 1610 | * |
| 1611 | * @param pStmt The prepared Statement |
| 1612 | * @param provider The object precipitating a possible invalidation |
| 1613 | * @param action The action causing the possible invalidation |
| 1614 | * |
| 1615 | * @return Nothing. |
| 1616 | * |
| 1617 | * @exception StandardException thrown on failure |
| 1618 | */ |
| 1619 | public boolean verifyNoOpenResultSets(PreparedStatement pStmt, Provider provider, |
| 1620 | int action) |
| 1621 | throws StandardException |
| 1622 | { |
| 1623 | /* |
| 1624 | ** It is not a problem to create an index when there is an open |
| 1625 | ** result set, since it doesn't invalidate the access path that was |
| 1626 | ** chosen for the result set. |
| 1627 | */ |
| 1628 | boolean seenOpenResultSets = false; |
| 1629 | |
| 1630 | /* For every activation */ |
| 1631 | |
| 1632 | // synchronize on acts as other threads may be closing activations |
| 1633 | // in this list, thus invalidating the Enumeration |
| 1634 | for (int i = acts.size() - 1; i >= 0; i--) { |
| 1635 | |
| 1636 | Activation a = (Activation) acts.elementAt(i); |
| 1637 | |
| 1638 | if (!a.isInUse()) |
| 1639 | { |
| 1640 | continue; |
| 1641 | } |
| 1642 | |
| 1643 | /* for this prepared statement */ |
| 1644 | if (pStmt == a.getPreparedStatement()) { |
| 1645 | ResultSet rs = a.getResultSet(); |
| 1646 | |
| 1647 | /* is there an open result set? */ |
| 1648 | if (rs != null && ! rs.isClosed()) |
| 1649 | { |
| 1650 | if (!rs.returnsRows()) |
| 1651 | continue; |
| 1652 | seenOpenResultSets = true; |
| 1653 | break; |
| 1654 | } |
| 1655 | |
| 1656 | } |
| 1657 | } |
| 1658 | |
| 1659 | if (!seenOpenResultSets) |
| 1660 | return false; |
| 1661 | |
| 1662 | // There may be open ResultSet's that are yet to be garbage collected |
| 1663 | // let's try and force these out rather than throw an error |
| 1664 | System.gc(); |
| 1665 | System.runFinalization(); |
| 1666 | |
| 1667 | |
| 1668 | /* For every activation */ |
| 1669 | // synchronize on acts as other threads may be closing activations |
| 1670 | // in this list, thus invalidating the Enumeration |
| 1671 | for (int i = acts.size() - 1; i >= 0; i--) { |
| 1672 | |
| 1673 | Activation a = (Activation) acts.elementAt(i); |
| 1674 | |
| 1675 | if (!a.isInUse()) |
| 1676 | { |
| 1677 | continue; |
| 1678 | } |
| 1679 | |
| 1680 | /* for this prepared statement */ |
| 1681 | if (pStmt == a.getPreparedStatement()) { |
| 1682 | ResultSet rs = a.getResultSet(); |
| 1683 | |
| 1684 | /* is there an open result set? */ |
| 1685 | if (rs != null && ! rs.isClosed()) |
| 1686 | { |
| 1687 | if ((provider != null) && rs.returnsRows()) { |
| 1688 | DependencyManager dmgr = getDataDictionary().getDependencyManager(); |
| 1689 | |
| 1690 | throw StandardException.newException(SQLState.LANG_CANT_INVALIDATE_OPEN_RESULT_SET, |
| 1691 | dmgr.getActionString(action), |
| 1692 | provider.getObjectName()); |
| 1693 | |
| 1694 | } |
| 1695 | return true; |
| 1696 | } |
| 1697 | } |
| 1698 | } |
| 1699 | return false; |
| 1700 | } |
| 1701 | |
| 1702 | /** |
| 1703 | * Get the Authorization Id |
| 1704 | * |
| 1705 | * @return String the authorization id |
| 1706 | */ |
| 1707 | public String getAuthorizationId() |
| 1708 | { |
| 1709 | return authorizer.getAuthorizationId(); |
| 1710 | } |
| 1711 | |
| 1712 | /** |
| 1713 | * Get the default schema |
| 1714 | * |
| 1715 | * @return SchemaDescriptor the default schema |
| 1716 | */ |
| 1717 | public SchemaDescriptor getDefaultSchema() |
| 1718 | { |
| 1719 | return sd; |
| 1720 | } |
| 1721 | /** |
| 1722 | * Get the current schema name |
| 1723 | * |
| 1724 | * @return current schema name |
| 1725 | */ |
| 1726 | public String getCurrentSchemaName() |
| 1727 | { |
| 1728 | if( null == sd) |
| 1729 | return null; |
| 1730 | return sd.getSchemaName(); |
| 1731 | } |
| 1732 | |
| 1733 | /** |
| 1734 | * Set the default schema -- used by SET SCHEMA. |
| 1735 | * |
| 1736 | * @param sd the new default schema. |
| 1737 | * If null, then the default schema descriptor is used. |
| 1738 | * |
| 1739 | * @exception StandardException thrown on failure |
| 1740 | */ |
| 1741 | public void setDefaultSchema(SchemaDescriptor sd) |
| 1742 | throws StandardException |
| 1743 | { |
| 1744 | if (sd == null) |
| 1745 | { |
| 1746 | sd = initDefaultSchemaDescriptor(); |
| 1747 | } |
| 1748 | this.sd = sd; |
| 1749 | |
| 1750 | } |
| 1751 | |
| 1752 | /** |
| 1753 | * Get the identity column value most recently generated. |
| 1754 | * |
| 1755 | * @return the generated identity column value |
| 1756 | */ |
| 1757 | public Long getIdentityValue() |
| 1758 | { |
| 1759 | return identityNotNull ? new Long(identityVal) : null; |
| 1760 | } |
| 1761 | |
| 1762 | /** |
| 1763 | * Set the field of most recently generated identity column value. |
| 1764 | * |
| 1765 | * @param val the generated identity column value |
| 1766 | */ |
| 1767 | public void setIdentityValue(long val) |
| 1768 | { |
| 1769 | identityVal = val; |
| 1770 | identityNotNull = true; |
| 1771 | } |
| 1772 | |
| 1773 | /** |
| 1774 | Empty as much of the cache as possible. It is not guaranteed |
| 1775 | that the cache is empty after this call, as statements may be kept |
| 1776 | by currently executing queries, activations that are about to be garbage |
| 1777 | collected. |
| 1778 | */ |
| 1779 | public void emptyCache() { |
| 1780 | /* We know prepared statements don't become dirty |
| 1781 | ** statementCache.cleanAll(); |
| 1782 | */ |
| 1783 | if (statementCache != null) |
| 1784 | statementCache.ageOut(); |
| 1785 | } |
| 1786 | |
| 1787 | /** |
| 1788 | * Push a CompilerContext on the context stack with |
| 1789 | * the current default schema as the default schema |
| 1790 | * which we compile against. |
| 1791 | * |
| 1792 | * @return the compiler context |
| 1793 | * |
| 1794 | * @exception StandardException thrown on failure |
| 1795 | */ |
| 1796 | public final CompilerContext pushCompilerContext() |
| 1797 | { |
| 1798 | return pushCompilerContext((SchemaDescriptor)null); |
| 1799 | } |
| 1800 | |
| 1801 | /** |
| 1802 | * Push a CompilerContext on the context stack with |
| 1803 | * the passed in default schema as the default schema |
| 1804 | * we compile against. |
| 1805 | * |
| 1806 | * @param sd the default schema |
| 1807 | * |
| 1808 | * @return the compiler context |
| 1809 | * |
| 1810 | */ |
| 1811 | public CompilerContext pushCompilerContext(SchemaDescriptor sd) |
| 1812 | { |
| 1813 | CompilerContext cc; |
| 1814 | boolean firstCompilerContext = false; |
| 1815 | |
| 1816 | // DEBUG END |
| 1817 | |
| 1818 | cc = (CompilerContext) (getContextManager().getContext(CompilerContext.CONTEXT_ID)); |
| 1819 | |
| 1820 | /* |
| 1821 | ** If there is no compiler context, this is the first one on the |
| 1822 | ** stack, so don't pop it when we're done (saves time). |
| 1823 | */ |
| 1824 | if (cc == null) { firstCompilerContext = true; } |
| 1825 | |
| 1826 | if (cc == null || cc.getInUse()) |
| 1827 | { |
| 1828 | cc = new CompilerContextImpl(getContextManager(), this, tcf); |
| 1829 | if (firstCompilerContext) { cc.firstOnStack(); } |
| 1830 | } |
| 1831 | else |
| 1832 | { |
| 1833 | /* Reset the next column,table, subquery and ResultSet numbers at |
| 1834 | * the beginning of each statement |
| 1835 | */ |
| 1836 | cc.resetContext(); |
| 1837 | } |
| 1838 | |
| 1839 | cc.setInUse(true); |
| 1840 | |
| 1841 | // Save off the current isolation level on entry so that it gets restored |
| 1842 | cc.setEntryIsolationLevel( getCurrentIsolationLevel()); |
| 1843 | |
| 1844 | StatementContext sc = getStatementContext(); |
| 1845 | if (sc.getSystemCode()) |
| 1846 | cc.setReliability(CompilerContext.INTERNAL_SQL_LEGAL); |
| 1847 | |
| 1848 | return cc; |
| 1849 | } |
| 1850 | |
| 1851 | |
| 1852 | /** |
| 1853 | * Pop a CompilerContext off the context stack. |
| 1854 | * |
| 1855 | * @param cc The compiler context. |
| 1856 | */ |
| 1857 | public void popCompilerContext(CompilerContext cc) |
| 1858 | { |
| 1859 | cc.setCurrentDependent(null); |
| 1860 | |
| 1861 | cc.setInUse(false); |
| 1862 | |
| 1863 | // Restore the isolation level at the time of entry to CompilerContext |
| 1864 | isolationLevel = cc.getEntryIsolationLevel(); |
| 1865 | |
| 1866 | /* |
| 1867 | ** Only pop the compiler context if it's not the first one |
| 1868 | ** on the stack. |
| 1869 | */ |
| 1870 | if (! cc.isFirstOnStack()) |
| 1871 | { |
| 1872 | cc.popMe(); |
| 1873 | } |
| 1874 | else |
| 1875 | { |
| 1876 | cc.setCompilationSchema((SchemaDescriptor)null); |
| 1877 | } |
| 1878 | } |
| 1879 | |
| 1880 | /** |
| 1881 | * Push a StatementContext on the context stack. |
| 1882 | * |
| 1883 | * @param isAtomic whether this statement is atomic or not |
| 1884 | * @param isForReadOnly whether this statement is for a read only resultset |
| 1885 | * @param stmtText the text of the statement. Needed for any language |
| 1886 | * statement (currently, for any statement that can cause a trigger |
| 1887 | * to fire). Please set this unless you are some funky jdbc setXXX |
| 1888 | * method or something. |
| 1889 | * @param pvs parameter value set, if it has one |
| 1890 | * @param rollbackParentContext True if 1) the statement context is |
| 1891 | * NOT a top-level context, AND 2) in the event of a statement-level |
| 1892 | * exception, the parent context needs to be rolled back, too. |
| 1893 | * @param timeoutMillis timeout value for this statement, in milliseconds. |
| 1894 | * The value 0 means that no timeout is set. |
| 1895 | * |
| 1896 | * @return StatementContext The statement context. |
| 1897 | * |
| 1898 | */ |
| 1899 | public StatementContext pushStatementContext (boolean isAtomic, boolean isForReadOnly, |
| 1900 | String stmtText, ParameterValueSet pvs, |
| 1901 | boolean rollbackParentContext, |
| 1902 | long timeoutMillis) |
| 1903 | { |
| 1904 | int parentStatementDepth = statementDepth; |
| 1905 | boolean inTrigger = false; |
| 1906 | boolean parentIsAtomic = false; |
| 1907 | |
| 1908 | // by default, assume we are going to use the outermost statement context |
| 1909 | StatementContext statementContext = statementContexts[0]; |
| 1910 | |
| 1911 | /* |
| 1912 | ** If we haven't allocated any statement contexts yet, allocate |
| 1913 | ** the outermost stmt context now and push it. |
| 1914 | */ |
| 1915 | if (statementContext == null) |
| 1916 | { |
| 1917 | statementContext = statementContexts[0] = new GenericStatementContext(this, tran); |
| 1918 | } |
| 1919 | else if (statementDepth > 0) |
| 1920 | { |
| 1921 | StatementContext parentStatementContext; |
| 1922 | /* |
| 1923 | ** We also cache a 2nd statement context, though we still |
| 1924 | ** push and pop it. Note, new contexts are automatically pushed. |
| 1925 | */ |
| 1926 | if (statementDepth == 1) |
| 1927 | { |
| 1928 | statementContext = statementContexts[1]; |
| 1929 | |
| 1930 | if (statementContext == null) |
| 1931 | statementContext = statementContexts[1] = new GenericStatementContext(this, tran); |
| 1932 | else |
| 1933 | statementContext.pushMe(); |
| 1934 | |
| 1935 | parentStatementContext = statementContexts[0]; |
| 1936 | } |
| 1937 | else |
| 1938 | { |
| 1939 | parentStatementContext = getStatementContext(); |
| 1940 | statementContext = new GenericStatementContext(this, tran); |
| 1941 | } |
| 1942 | |
| 1943 | inTrigger = parentStatementContext.inTrigger() || (outermostTrigger == parentStatementDepth); |
| 1944 | parentIsAtomic = parentStatementContext.isAtomic(); |
| 1945 | statementContext.setSQLAllowed(parentStatementContext.getSQLAllowed(), false); |
| 1946 | if (parentStatementContext.getSystemCode()) |
| 1947 | statementContext.setSystemCode(); |
| 1948 | } |
| 1949 | |
| 1950 | incrementStatementDepth(); |
| 1951 | |
| 1952 | statementContext.setInUse(inTrigger, isAtomic || parentIsAtomic, isForReadOnly, stmtText, pvs, timeoutMillis); |
| 1953 | if (rollbackParentContext) |
| 1954 | statementContext.setParentRollback(); |
| 1955 | return statementContext; |
| 1956 | } |
| 1957 | |
| 1958 | /** |
| 1959 | * Pop a StatementContext of the context stack. |
| 1960 | * |
| 1961 | * @param statementContext The statement context. |
| 1962 | * @param error The error, if any (Only relevant for DEBUG) |
| 1963 | */ |
| 1964 | public void popStatementContext(StatementContext statementContext, |
| 1965 | Throwable error) |
| 1966 | { |
| 1967 | if ( statementContext != null ) |
| 1968 | { |
| 1969 | /* |
| 1970 | ** If someone beat us to the punch, then it is ok, |
| 1971 | ** just silently ignore it. We probably got here |
| 1972 | ** because we had a try catch block around a push/pop |
| 1973 | ** statement context, and we already got the context |
| 1974 | ** on a cleanupOnError. |
| 1975 | */ |
| 1976 | if (!statementContext.inUse()) |
| 1977 | { |
| 1978 | return; |
| 1979 | } |
| 1980 | statementContext.clearInUse(); |
| 1981 | } |
| 1982 | |
| 1983 | decrementStatementDepth(); |
| 1984 | if (statementDepth == -1) |
| 1985 | { |
| 1986 | /* |
| 1987 | * Only ignore the pop request for an already |
| 1988 | * empty stack when dealing with a session exception. |
| 1989 | */ |
| 1990 | if (SanityManager.DEBUG) |
| 1991 | { |
| 1992 | int severity = (error instanceof StandardException) ? |
| 1993 | ((StandardException)error).getSeverity() : |
| 1994 | 0; |
| 1995 | SanityManager.ASSERT(error != null, |
| 1996 | "Must have error to try popStatementContext with 0 depth"); |
| 1997 | SanityManager.ASSERT( |
| 1998 | (severity == ExceptionSeverity.SESSION_SEVERITY), |
| 1999 | "Must have session severity error to try popStatementContext with 0 depth"); |
| 2000 | SanityManager.ASSERT(statementContext == statementContexts[0], |
| 2001 | "statementContext is expected to equal statementContexts[0]"); |
| 2002 | } |
| 2003 | resetStatementDepth(); // pretend we did nothing. |
| 2004 | } |
| 2005 | else if (statementDepth == 0) |
| 2006 | { |
| 2007 | if (SanityManager.DEBUG) |
| 2008 | { |
| 2009 | /* Okay to pop last context on a session exception. |
| 2010 | * (We call clean up on error when exiting connection.) |
| 2011 | */ |
| 2012 | int severity = (error instanceof StandardException) ? |
| 2013 | ((StandardException)error).getSeverity() : |
| 2014 | 0; |
| 2015 | if ((error == null) || |
| 2016 | (severity != ExceptionSeverity.SESSION_SEVERITY)) |
| 2017 | { |
| 2018 | SanityManager.ASSERT(statementContext == statementContexts[0], |
| 2019 | "statementContext is expected to equal statementContexts[0]"); |
| 2020 | } |
| 2021 | } |
| 2022 | } |
| 2023 | else |
| 2024 | { |
| 2025 | if (SanityManager.DEBUG) |
| 2026 | { |
| 2027 | SanityManager.ASSERT(statementContext != statementContexts[0], |
| 2028 | "statementContext is not expected to equal statementContexts[0]"); |
| 2029 | if (statementDepth <= 0) |
| 2030 | SanityManager.THROWASSERT( |
| 2031 | "statement depth expected to be >0, was "+statementDepth); |
| 2032 | |
| 2033 | if (getContextManager().getContext(statementContext.getIdName()) != statementContext) |
| 2034 | { |
| 2035 | SanityManager.THROWASSERT("trying to pop statement context from middle of stack"); |
| 2036 | } |
| 2037 | } |
| 2038 | |
| 2039 | statementContext.popMe(); |
| 2040 | } |
| 2041 | |
| 2042 | } |
| 2043 | |
| 2044 | /** |
| 2045 | * Push a new execution statement validator. An execution statement |
| 2046 | * validator is an object that validates the current statement to |
| 2047 | * ensure that it is permitted given the current execution context. |
| 2048 | * An example of a validator a trigger ExecutionStmtValidator that |
| 2049 | * doesn't allow ddl on the trigger target table. |
| 2050 | * <p> |
| 2051 | * Multiple ExecutionStmtValidators may be active at any given time. |
| 2052 | * This mirrors the way there can be multiple connection nestings |
| 2053 | * at a single time. The validation is performed by calling each |
| 2054 | * validator's validateStatement() method. This yields the union |
| 2055 | * of all validations. |
| 2056 | * |
| 2057 | * @param validator the validator to add |
| 2058 | */ |
| 2059 | public void pushExecutionStmtValidator(ExecutionStmtValidator validator) |
| 2060 | { |
| 2061 | stmtValidators.addElement(validator); |
| 2062 | } |
| 2063 | |
| 2064 | /** |
| 2065 | * Remove the validator. Does an object identity (validator == validator) |
| 2066 | * comparison. Asserts that the validator is found. |
| 2067 | * |
| 2068 | * @param validator the validator to remove |
| 2069 | * |
| 2070 | * @exception StandardException on error |
| 2071 | */ |
| 2072 | public void popExecutionStmtValidator(ExecutionStmtValidator validator) |
| 2073 | throws StandardException |
| 2074 | { |
| 2075 | boolean foundElement = stmtValidators.removeElement(validator); |
| 2076 | if (SanityManager.DEBUG) |
| 2077 | { |
| 2078 | if (!foundElement) |
| 2079 | { |
| 2080 | SanityManager.THROWASSERT("statement validator "+validator+" not found"); |
| 2081 | } |
| 2082 | } |
| 2083 | } |
| 2084 | |
| 2085 | /** |
| 2086 | * Push a new trigger execution context. |
| 2087 | * <p> |
| 2088 | * Multiple TriggerExecutionContexts may be active at any given time. |
| 2089 | * |
| 2090 | * @param tec the trigger execution context |
| 2091 | * |
| 2092 | * @exception StandardException on trigger recursion error |
| 2093 | */ |
| 2094 | public void pushTriggerExecutionContext(TriggerExecutionContext tec) throws StandardException |
| 2095 | { |
| 2096 | if (outermostTrigger == -1) |
| 2097 | { |
| 2098 | outermostTrigger = statementDepth; |
| 2099 | } |
| 2100 | |
| 2101 | /* Maximum 16 nesting levels allowed */ |
| 2102 | if (triggerExecutionContexts.size() >= Limits.DB2_MAX_TRIGGER_RECURSION) |
| 2103 | { |
| 2104 | throw StandardException.newException(SQLState.LANG_TRIGGER_RECURSION_EXCEEDED); |
| 2105 | } |
| 2106 | |
| 2107 | triggerExecutionContexts.addElement(tec); |
| 2108 | } |
| 2109 | |
| 2110 | /** |
| 2111 | * Remove the tec. Does an object identity (tec == tec) |
| 2112 | * comparison. Asserts that the tec is found. |
| 2113 | * |
| 2114 | * @param tec the tec to remove |
| 2115 | * |
| 2116 | * @exception StandardException on error |
| 2117 | */ |
| 2118 | public void popTriggerExecutionContext(TriggerExecutionContext tec) |
| 2119 | throws StandardException |
| 2120 | { |
| 2121 | if (outermostTrigger == statementDepth) |
| 2122 | { |
| 2123 | outermostTrigger = -1; |
| 2124 | } |
| 2125 | |
| 2126 | boolean foundElement = triggerExecutionContexts.removeElement(tec); |
| 2127 | if (SanityManager.DEBUG) |
| 2128 | { |
| 2129 | if (!foundElement) |
| 2130 | { |
| 2131 | SanityManager.THROWASSERT("trigger execution context "+tec+" not found"); |
| 2132 | } |
| 2133 | } |
| 2134 | } |
| 2135 | |
| 2136 | /** |
| 2137 | * Get the topmost tec. |
| 2138 | * |
| 2139 | * @return the tec |
| 2140 | */ |
| 2141 | public TriggerExecutionContext getTriggerExecutionContext() |
| 2142 | { |
| 2143 | return triggerExecutionContexts.size() == 0 ? |
| 2144 | (TriggerExecutionContext)null : |
| 2145 | (TriggerExecutionContext)triggerExecutionContexts.lastElement(); |
| 2146 | } |
| 2147 | |
| 2148 | /** |
| 2149 | * Validate a statement. Does so by stepping through all the validators |
| 2150 | * and executing them. If a validator throws and exception, then the |
| 2151 | * checking is stopped and the exception is passed up. |
| 2152 | * |
| 2153 | * @param constantAction the constantAction that is about to be executed (and |
| 2154 | * should be validated |
| 2155 | * |
| 2156 | * @exception StandardException on validation failure |
| 2157 | */ |
| 2158 | public void validateStmtExecution(ConstantAction constantAction) |
| 2159 | throws StandardException |
| 2160 | { |
| 2161 | if (SanityManager.DEBUG) |
| 2162 | { |
| 2163 | SanityManager.ASSERT(constantAction!=null, "constantAction is null"); |
| 2164 | } |
| 2165 | |
| 2166 | if (stmtValidators.size() > 0) |
| 2167 | { |
| 2168 | for (Enumeration e = stmtValidators.elements(); e.hasMoreElements(); ) |
| 2169 | { |
| 2170 | ((ExecutionStmtValidator)e.nextElement()).validateStatement(constantAction); |
| 2171 | } |
| 2172 | } |
| 2173 | } |
| 2174 | |
| 2175 | /** |
| 2176 | * Set the trigger table descriptor. Used to compile |
| 2177 | * statements that may special trigger pseudo tables. |
| 2178 | * |
| 2179 | * @param td the table that the trigger is |
| 2180 | * defined upon |
| 2181 | * |
| 2182 | */ |
| 2183 | public void pushTriggerTable(TableDescriptor td) |
| 2184 | { |
| 2185 | triggerTables.addElement(td); |
| 2186 | } |
| 2187 | |
| 2188 | /** |
| 2189 | * Remove the trigger table descriptor. |
| 2190 | * |
| 2191 | * @param td the table to remove from the stack. |
| 2192 | */ |
| 2193 | public void popTriggerTable(TableDescriptor td) |
| 2194 | { |
| 2195 | boolean foundElement = triggerTables.removeElement(td); |
| 2196 | if (SanityManager.DEBUG) |
| 2197 | { |
| 2198 | if (!foundElement) |
| 2199 | { |
| 2200 | SanityManager.THROWASSERT("trigger table not found: "+td); |
| 2201 | } |
| 2202 | } |
| 2203 | } |
| 2204 | |
| 2205 | /** |
| 2206 | * Get the topmost trigger table descriptor |
| 2207 | * |
| 2208 | * @return the table descriptor, or null if we |
| 2209 | * aren't in the middle of compiling a create |
| 2210 | * trigger. |
| 2211 | */ |
| 2212 | public TableDescriptor getTriggerTable() |
| 2213 | { |
| 2214 | return triggerTables.size() == 0 ? |
| 2215 | (TableDescriptor)null : |
| 2216 | (TableDescriptor)triggerTables.lastElement(); |
| 2217 | } |
| 2218 | /** |
| 2219 | * @see LanguageConnectionContext#getDatabase |
| 2220 | */ |
| 2221 | public Database |
| 2222 | getDatabase() |
| 2223 | { |
| 2224 | return db; |
| 2225 | } |
| 2226 | |
| 2227 | /** @see LanguageConnectionContext#incrementBindCount */ |
| 2228 | public int incrementBindCount() |
| 2229 | { |
| 2230 | bindCount++; |
| 2231 | return bindCount; |
| 2232 | } |
| 2233 | |
| 2234 | |
| 2235 | /** @see LanguageConnectionContext#decrementBindCount */ |
| 2236 | public int decrementBindCount() |
| 2237 | { |
| 2238 | bindCount--; |
| 2239 | |
| 2240 | if (SanityManager.DEBUG) |
| 2241 | { |
| 2242 | if (bindCount < 0) |
| 2243 | SanityManager.THROWASSERT( |
| 2244 | "Level of nested binding == " + bindCount); |
| 2245 | } |
| 2246 | |
| 2247 | return bindCount; |
| 2248 | } |
| 2249 | |
| 2250 | /** @see LanguageConnectionContext#getBindCount */ |
| 2251 | public int getBindCount() |
| 2252 | { |
| 2253 | return bindCount; |
| 2254 | } |
| 2255 | |
| 2256 | /** @see LanguageConnectionContext#setDataDictionaryWriteMode */ |
| 2257 | public final void setDataDictionaryWriteMode() |
| 2258 | { |
| 2259 | ddWriteMode = true; |
| 2260 | } |
| 2261 | |
| 2262 | /** @see LanguageConnectionContext#dataDictionaryInWriteMode */ |
| 2263 | public final boolean dataDictionaryInWriteMode() |
| 2264 | { |
| 2265 | return ddWriteMode; |
| 2266 | } |
| 2267 | |
| 2268 | /** @see LanguageConnectionContext#setRunTimeStatisticsMode */ |
| 2269 | public void setRunTimeStatisticsMode(boolean onOrOff) |
| 2270 | { |
| 2271 | runTimeStatisticsSetting = onOrOff; |
| 2272 | } |
| 2273 | |
| 2274 | /** @see LanguageConnectionContext#getRunTimeStatisticsMode */ |
| 2275 | public boolean getRunTimeStatisticsMode() |
| 2276 | { |
| 2277 | return runTimeStatisticsSetting; |
| 2278 | } |
| 2279 | |
| 2280 | /** @see LanguageConnectionContext#setStatisticsTiming */ |
| 2281 | public void setStatisticsTiming(boolean onOrOff) |
| 2282 | { |
| 2283 | statisticsTiming = onOrOff; |
| 2284 | } |
| 2285 | |
| 2286 | /** @see LanguageConnectionContext#getStatisticsTiming */ |
| 2287 | public boolean getStatisticsTiming() |
| 2288 | { |
| 2289 | return statisticsTiming; |
| 2290 | } |
| 2291 | |
| 2292 | /** @see LanguageConnectionContext#setRunTimeStatisticsObject */ |
| 2293 | public void setRunTimeStatisticsObject(RunTimeStatistics runTimeStatisticsObject) |
| 2294 | { |
| 2295 | this.runTimeStatisticsObject = runTimeStatisticsObject; |
| 2296 | } |
| 2297 | |
| 2298 | /** @see LanguageConnectionContext#getRunTimeStatisticsObject */ |
| 2299 | public RunTimeStatistics getRunTimeStatisticsObject() |
| 2300 | { |
| 2301 | return runTimeStatisticsObject; |
| 2302 | } |
| 2303 | |
| 2304 | |
| 2305 | /** |
| 2306 | * Reports how many statement levels deep we are. |
| 2307 | * |
| 2308 | * @return a statement level >= OUTERMOST_STATEMENT |
| 2309 | */ |
| 2310 | public int getStatementDepth() |
| 2311 | { return statementDepth; } |
| 2312 | |
| 2313 | /** |
| 2314 | * @see LanguageConnectionContext#isIsolationLevelSetUsingSQLorJDBC |
| 2315 | */ |
| 2316 | public boolean isIsolationLevelSetUsingSQLorJDBC() |
| 2317 | { |
| 2318 | return isolationLevelSetUsingSQLorJDBC; |
| 2319 | } |
| 2320 | |
| 2321 | /** |
| 2322 | * @see LanguageConnectionContext#resetIsolationLevelFlagUsedForSQLandJDBC |
| 2323 | */ |
| 2324 | public void resetIsolationLevelFlagUsedForSQLandJDBC() |
| 2325 | { |
| 2326 | isolationLevelSetUsingSQLorJDBC = false; |
| 2327 | } |
| 2328 | |
| 2329 | /** |
| 2330 | * @see LanguageConnectionContext#setIsolationLevel |
| 2331 | */ |
| 2332 | public void setIsolationLevel(int isolationLevel) throws StandardException |
| 2333 | { |
| 2334 | StatementContext stmtCtxt = getStatementContext(); |
| 2335 | if (stmtCtxt!= null && stmtCtxt.inTrigger()) |
| 2336 | throw StandardException.newException(SQLState.LANG_NO_XACT_IN_TRIGGER, getTriggerExecutionContext().toString()); |
| 2337 | |
| 2338 | // find if there are any held cursors from previous isolation level. |
| 2339 | // if yes, then throw an exception that isolation change not allowed until |
| 2340 | // the held cursors are closed. |
| 2341 | // I had to move this check outside of transaction idle check because if a |
| 2342 | // transactions creates held cursors and commits the transaction, then |
| 2343 | // there still would be held cursors but the transaction state would be idle. |
| 2344 | // In order to check the above mentioned case, the held cursor check |
| 2345 | // shouldn't rely on transaction state. |
| 2346 | if (this.isolationLevel != isolationLevel) |
| 2347 | { |
| 2348 | if (!verifyAllHeldResultSetsAreClosed()) |
| 2349 | { |
| 2350 | throw StandardException.newException(SQLState.LANG_CANT_CHANGE_ISOLATION_HOLD_CURSOR); |
| 2351 | } |
| 2352 | } |
| 2353 | |
| 2354 | /* Commit and set to new isolation level. |
| 2355 | * NOTE: We commit first in case there's some kind |
| 2356 | * of error, like can't commit within a server side jdbc call. |
| 2357 | */ |
| 2358 | TransactionController tc = getTransactionExecute(); |
| 2359 | if (!tc.isIdle()) |
| 2360 | { |
| 2361 | // If this transaction is in progress, commit it. |
| 2362 | // However, do not allow commit to happen if this is a global |
| 2363 | // transaction. |
| 2364 | if (tc.isGlobal()) |
| 2365 | throw StandardException.newException(SQLState.LANG_NO_SET_TRAN_ISO_IN_GLOBAL_CONNECTION); |
| 2366 | |
| 2367 | userCommit(); |
| 2368 | } |
| 2369 | this.isolationLevel = isolationLevel; |
| 2370 | this.isolationLevelExplicitlySet = true; |
| 2371 | this.isolationLevelSetUsingSQLorJDBC = true; |
| 2372 | } |
| 2373 | |
| 2374 | /** |
| 2375 | * @see LanguageConnectionContext#getCurrentIsolationLevel |
| 2376 | */ |
| 2377 | public int getCurrentIsolationLevel() |
| 2378 | { |
| 2379 | return (isolationLevel == ExecutionContext.UNSPECIFIED_ISOLATION_LEVEL) ? defaultIsolationLevel : isolationLevel; |
| 2380 | } |
| 2381 | |
| 2382 | /** |
| 2383 | * @see LanguageConnectionContext#getCurrentIsolationLevel |
| 2384 | */ |
| 2385 | public String getCurrentIsolationLevelStr() |
| 2386 | { |
| 2387 | if( isolationLevel >= 0 && isolationLevel < ExecutionContext.CS_TO_SQL_ISOLATION_MAP.length) |
| 2388 | return ExecutionContext.CS_TO_SQL_ISOLATION_MAP[ isolationLevel][0]; |
| 2389 | return ExecutionContext.CS_TO_SQL_ISOLATION_MAP[ ExecutionContext.UNSPECIFIED_ISOLATION_LEVEL][0]; |
| 2390 | } |
| 2391 | |
| 2392 | /** |
| 2393 | * @see LanguageConnectionContext#setPrepareIsolationLevel |
| 2394 | */ |
| 2395 | public void setPrepareIsolationLevel(int level) |
| 2396 | { |
| 2397 | prepareIsolationLevel = level; |
| 2398 | } |
| 2399 | |
| 2400 | /** |
| 2401 | * @see LanguageConnectionContext#getPrepareIsolationLevel |
| 2402 | */ |
| 2403 | public int getPrepareIsolationLevel() |
| 2404 | { |
| 2405 | if (!isolationLevelExplicitlySet) |
| 2406 | return prepareIsolationLevel; |
| 2407 | else |
| 2408 | return ExecutionContext.UNSPECIFIED_ISOLATION_LEVEL; |
| 2409 | } |
| 2410 | |
| 2411 | /** |
| 2412 | * @see LanguageConnectionContext#getExecutionContext |
| 2413 | */ |
| 2414 | public ExecutionContext getExecutionContext() |
| 2415 | { |
| 2416 | return (ExecutionContext) getContextManager().getContext(ExecutionContext.CONTEXT_ID); |
| 2417 | } |
| 2418 | |
| 2419 | /** |
| 2420 | * @see LanguageConnectionContext#getStatementContext |
| 2421 | */ |
| 2422 | public StatementContext getStatementContext() |
| 2423 | { |
| 2424 | return (StatementContext) getContextManager().getContext(org.apache.derby.iapi.reference.ContextId.LANG_STATEMENT); |
| 2425 | } |
| 2426 | |
| 2427 | /** |
| 2428 | * @see LanguageConnectionContext#setOptimizerTrace |
| 2429 | */ |
| 2430 | public boolean setOptimizerTrace(boolean onOrOff) |
| 2431 | { |
| 2432 | if (of == null) |
| 2433 | { |
| 2434 | return false; |
| 2435 | } |
| 2436 | if (! of.supportsOptimizerTrace()) |
| 2437 | { |
| 2438 | return false; |
| 2439 | } |
| 2440 | optimizerTrace = onOrOff; |
| 2441 | return true; |
| 2442 | } |
| 2443 | |
| 2444 | /** |
| 2445 | * @see LanguageConnectionContext#getOptimizerTrace |
| 2446 | */ |
| 2447 | public boolean getOptimizerTrace() |
| 2448 | { |
| 2449 | return optimizerTrace; |
| 2450 | } |
| 2451 | |
| 2452 | /** |
| 2453 | * @see LanguageConnectionContext#setOptimizerTraceHtml |
| 2454 | */ |
| 2455 | public boolean setOptimizerTraceHtml(boolean onOrOff) |
| 2456 | { |
| 2457 | if (of == null) |
| 2458 | { |
| 2459 | return false; |
| 2460 | } |
| 2461 | if (! of.supportsOptimizerTrace()) |
| 2462 | { |
| 2463 | return false; |
| 2464 | } |
| 2465 | optimizerTraceHtml = onOrOff; |
| 2466 | return true; |
| 2467 | } |
| 2468 | |
| 2469 | /** |
| 2470 | * @see LanguageConnectionContext#getOptimizerTraceHtml |
| 2471 | */ |
| 2472 | public boolean getOptimizerTraceHtml() |
| 2473 | { |
| 2474 | return optimizerTraceHtml; |
| 2475 | } |
| 2476 | |
| 2477 | /** |
| 2478 | * @see LanguageConnectionContext#setOptimizerTraceOutput |
| 2479 | */ |
| 2480 | public void setOptimizerTraceOutput(String startingText) |
| 2481 | { |
| 2482 | if (optimizerTrace) |
| 2483 | { |
| 2484 | lastOptimizerTraceOutput = optimizerTraceOutput; |
| 2485 | optimizerTraceOutput = startingText; |
| 2486 | } |
| 2487 | } |
| 2488 | |
| 2489 | /** |
| 2490 | * @see LanguageConnectionContext#appendOptimizerTraceOutput |
| 2491 | */ |
| 2492 | public void appendOptimizerTraceOutput(String output) |
| 2493 | { |
| 2494 | optimizerTraceOutput = |
| 2495 | (optimizerTraceOutput == null) ? output : optimizerTraceOutput + output; |
| 2496 | } |
| 2497 | |
| 2498 | /** |
| 2499 | * @see LanguageConnectionContext#getOptimizerTraceOutput |
| 2500 | */ |
| 2501 | public String getOptimizerTraceOutput() |
| 2502 | { |
| 2503 | return lastOptimizerTraceOutput; |
| 2504 | } |
| 2505 | |
| 2506 | /** |
| 2507 | * Reports whether there is any outstanding work in the transaction. |
| 2508 | * |
| 2509 | * @return true if there is outstanding work in the transaction |
| 2510 | * false otherwise |
| 2511 | */ |
| 2512 | public boolean isTransactionPristine() |
| 2513 | { |
| 2514 | return getTransactionExecute().isPristine(); |
| 2515 | } |
| 2516 | |
| 2517 | /** |
| 2518 | * Get the lock handle for the current transaction. |
| 2519 | * |
| 2520 | * @param lockScope SINGLE_TRANSACTION_LOCK or MULTI_TRANSACTION_LOCK |
| 2521 | * |
| 2522 | * @return the current lock handle |
| 2523 | * |
| 2524 | * @exception StandardException thrown if something goes wrong |
| 2525 | */ |
| 2526 | public Object getLockObject( int lockScope ) throws StandardException |
| 2527 | { |
| 2528 | switch( lockScope ) |
| 2529 | { |
| 2530 | case SINGLE_TRANSACTION_LOCK: |
| 2531 | return getTransactionExecute().getLockObject(); |
| 2532 | |
| 2533 | case MULTI_TRANSACTION_LOCK: |
| 2534 | return new Object(); |
| 2535 | |
| 2536 | default: |
| 2537 | throw StandardException.newException(SQLState.NOT_IMPLEMENTED); |
| 2538 | } |
| 2539 | } |
| 2540 | |
| 2541 | /** |
| 2542 | * Convert an identifier to the proper case for this connection. This method |
| 2543 | * is here to support the Plugin. |
| 2544 | * |
| 2545 | * @param id an identifier string |
| 2546 | * @return the string converted to upper or lower case, as appropriate |
| 2547 | * |
| 2548 | * @exception StandardException thrown if something goes wrong |
| 2549 | */ |
| 2550 | public String convertIdentifierCase( String id) throws StandardException |
| 2551 | { |
| 2552 | if( ANTI_ANSI_CASING == getIdentifierCasing()) |
| 2553 | return StringUtil.SQLToLowerCase(id); |
| 2554 | else |
| 2555 | return StringUtil.SQLToUpperCase(id); |
| 2556 | } |
| 2557 | |
| 2558 | /** |
| 2559 | * Get casing for delimited identifiers. This feature is here to |
| 2560 | * support the Plugin. |
| 2561 | * |
| 2562 | * @return ANSI_CASING or ANTI_ANSI_CASING. |
| 2563 | * |
| 2564 | * @exception StandardException thrown if something goes wrong |
| 2565 | */ |
| 2566 | public int getIdentifierCasing() throws StandardException |
| 2567 | { |
| 2568 | if( UNKNOWN_CASING == identifierCasing) |
| 2569 | { |
| 2570 | identifierCasing = ANSI_CASING; |
| 2571 | } |
| 2572 | return identifierCasing; |
| 2573 | } |
| 2574 | |
| 2575 | // |
| 2576 | // Context interface |
| 2577 | // |
| 2578 | /** |
| 2579 | If worse than a transaction error, everything goes; we |
| 2580 | rely on other contexts to kill the context manager |
| 2581 | for this session. |
| 2582 | <p> |
| 2583 | If a transaction error, act like we saw a rollback. |
| 2584 | <p> |
| 2585 | If more severe or a java error, the outer cleanup |
| 2586 | will shutdown the connection, so we don't have to clean up. |
| 2587 | <p> |
| 2588 | REMIND: connection should throw out all contexts and start |
| 2589 | over when the connection is closed... perhaps by throwing |
| 2590 | out the context manager? |
| 2591 | <p> |
| 2592 | REVISIT: If statement error, should we do anything? |
| 2593 | <P> |
| 2594 | Since the access manager's own context takes care of its own |
| 2595 | resources on errors, there is nothing that this context has |
| 2596 | to do with the transaction controller. |
| 2597 | |
| 2598 | @exception StandardException thrown on error. REVISIT: don't want |
| 2599 | cleanupOnError's to throw exceptions. |
| 2600 | */ |
| 2601 | public void cleanupOnError(Throwable error) throws StandardException { |
| 2602 | |
| 2603 | /* |
| 2604 | ** If it isn't a StandardException, then assume |
| 2605 | ** xact severity. It is probably an unexpected |
| 2606 | ** java error somewhere in the language. |
| 2607 | */ |
| 2608 | int severity = (error instanceof StandardException) ? |
| 2609 | ((StandardException) error).getSeverity() : |
| 2610 | ExceptionSeverity.TRANSACTION_SEVERITY; |
| 2611 | |
| 2612 | if (statementContexts[0] != null) |
| 2613 | { |
| 2614 | statementContexts[0].clearInUse(); |
| 2615 | |
| 2616 | // Force the StatementContext that's normally |
| 2617 | // left on the stack for optimization to be popped |
| 2618 | // when the session is closed. Ensures full cleanup |
| 2619 | // and no hanging refrences in the ContextManager. |
| 2620 | if (severity >= ExceptionSeverity.SESSION_SEVERITY) |
| 2621 | statementContexts[0].popMe(); |
| 2622 | } |
| 2623 | if (statementContexts[1] != null) |
| 2624 | { |
| 2625 | statementContexts[1].clearInUse(); |
| 2626 | } |
| 2627 | |
| 2628 | // closing the activations closes all the open cursors. |
| 2629 | // the activations are, for all intents and purposes, the |
| 2630 | // cursors. |
| 2631 | if (severity >= ExceptionSeverity.SESSION_SEVERITY) |
| 2632 | { |
| 2633 | for (int i = acts.size() - 1; i >= 0; i--) { |
| 2634 | // it maybe the case that a reset()/close() ends up closing |
| 2635 | // one or more activation leaving our index beyond |
| 2636 | // the end of the array |
| 2637 | if (i >= acts.size()) |
| 2638 | continue; |
| 2639 | Activation a = (Activation) acts.elementAt(i); |
| 2640 | a.reset(); |
| 2641 | a.close(); |
| 2642 | } |
| 2643 | |
| 2644 | popMe(); |
| 2645 | } |
| 2646 | |
| 2647 | /* |
| 2648 | ** We have some global state that we need |
| 2649 | ** to clean up no matter what. Be sure |
| 2650 | ** to do so. |
| 2651 | */ |
| 2652 | else if (severity >= ExceptionSeverity.TRANSACTION_SEVERITY) |
| 2653 | { |
| 2654 | internalRollback(); |
| 2655 | } |
| 2656 | } |
| 2657 | |
| 2658 | /** |
| 2659 | * @see Context#isLastHandler |
| 2660 | */ |
| 2661 | public boolean isLastHandler(int severity) |
| 2662 | { |
| 2663 | return false; |
| 2664 | } |
| 2665 | |
| 2666 | // |
| 2667 | // class implementation |
| 2668 | // |
| 2669 | |
| 2670 | |
| 2671 | /** |
| 2672 | resets all open activations, to close their result sets. |
| 2673 | Also cleans up (close()) activations that have been |
| 2674 | marked as unused during statement finalization. |
| 2675 | |
| 2676 | @exception StandardException thrown on failure |
| 2677 | */ |
| 2678 | private void resetActivations(boolean andClose) throws StandardException { |
| 2679 | |
| 2680 | // don't use an enumeration as the activation may remove |
| 2681 | // itself from the list, thus invalidating the Enumeration |
| 2682 | for (int i = acts.size() - 1; i >= 0; i--) { |
| 2683 | |
| 2684 | // it maybe the case that a reset() ends up closing |
| 2685 | // one or more activation leaving our index beyond |
| 2686 | // the end of the array |
| 2687 | if (i >= acts.size()) |
| 2688 | continue; |
| 2689 | |
| 2690 | Activation a = (Activation) acts.elementAt(i); |
| 2691 | /* |
| 2692 | ** andClose true means we are here for rollback. |
| 2693 | ** In case of rollback, we don't care for holding |
| 2694 | ** cursors and that's why I am resetting holdability |
| 2695 | ** to false for all activations just before rollback |
| 2696 | */ |
| 2697 | if (andClose) |
| 2698 | a.setResultSetHoldability(false); |
| 2699 | |
| 2700 | /* |
| 2701 | ** Look for stale activations. Activations are |
| 2702 | ** marked as unused during statement finalization. |
| 2703 | ** Here, we sweep and remove this inactive ones. |
| 2704 | */ |
| 2705 | if (!a.isInUse()) |
| 2706 | { |
| 2707 | a.close(); |
| 2708 | continue; |
| 2709 | } |
| 2710 | |
| 2711 | a.reset(); |
| 2712 | |
| 2713 | // Only invalidate statements if we performed DDL. |
| 2714 | if (andClose && dataDictionaryInWriteMode()) { |
| 2715 | ExecPreparedStatement ps = a.getPreparedStatement(); |
| 2716 | if (ps != null) { |
| 2717 | ps.makeInvalid(DependencyManager.ROLLBACK, this); |
| 2718 | } |
| 2719 | } |
| 2720 | } |
| 2721 | } |
| 2722 | |
| 2723 | /** |
| 2724 | Finish the data dictionary transaction, if any. |
| 2725 | |
| 2726 | @exception StandardException Thrown on error |
| 2727 | */ |
| 2728 | private void finishDDTransaction() throws StandardException { |
| 2729 | |
| 2730 | /* Was the data dictionary put into write mode? */ |
| 2731 | if (ddWriteMode) { |
| 2732 | DataDictionary dd = getDataDictionary(); |
| 2733 | |
| 2734 | /* Tell the data dictionary that the transaction is finished */ |
| 2735 | dd.transactionFinished(); |
| 2736 | |
| 2737 | /* The data dictionary isn't in write mode any more */ |
| 2738 | ddWriteMode = false; |
| 2739 | } |
| 2740 | } |
| 2741 | |
| 2742 | //////////////////////////////////////////////////////////////////// |
| 2743 | // |
| 2744 | // MINIONS |
| 2745 | // |
| 2746 | //////////////////////////////////////////////////////////////////// |
| 2747 | |
| 2748 | /** |
| 2749 | * Increments the statement depth. |
| 2750 | */ |
| 2751 | private void incrementStatementDepth() { statementDepth++; } |
| 2752 | |
| 2753 | /** |
| 2754 | * Decrements the statement depth |
| 2755 | */ |
| 2756 | private void decrementStatementDepth() |
| 2757 | { |
| 2758 | statementDepth--; |
| 2759 | } |
| 2760 | |
| 2761 | /** |
| 2762 | * Resets the statementDepth. |
| 2763 | */ |
| 2764 | protected void resetStatementDepth() |
| 2765 | { |
| 2766 | statementDepth = 0; |
| 2767 | } |
| 2768 | |
| 2769 | /** |
| 2770 | * Get the name of the system schema. |
| 2771 | * |
| 2772 | * @return A String containing the name of the system schema. |
| 2773 | * @throws StandardException |
| 2774 | */ |
| 2775 | public String getSystemSchemaName() throws StandardException |
| 2776 | { |
| 2777 | return convertIdentifierCase( SchemaDescriptor.STD_SYSTEM_SCHEMA_NAME); |
| 2778 | } |
| 2779 | |
| 2780 | /** |
| 2781 | * Get the name of the SYSIBM schema. |
| 2782 | * |
| 2783 | * @return A String containing the name of the SYSIBM schema. |
| 2784 | * @throws StandardException |
| 2785 | */ |
| 2786 | public String getSysIBMSchemaName() throws StandardException |
| 2787 | { |
| 2788 | return convertIdentifierCase( SchemaDescriptor.IBM_SYSTEM_SCHEMA_NAME); |
| 2789 | } |
| 2790 | |
| 2791 | /** |
| 2792 | * Get the name of the SYSCS_DIAG schema. |
| 2793 | * |
| 2794 | * @return A String containing the name of the SYSIBM schema. |
| 2795 | * @throws StandardException |
| 2796 | */ |
| 2797 | public String getSystemDiagSchemaName() throws StandardException |
| 2798 | { |
| 2799 | return( |
| 2800 | convertIdentifierCase( |
| 2801 | SchemaDescriptor.STD_SYSTEM_DIAG_SCHEMA_NAME)); |
| 2802 | } |
| 2803 | |
| 2804 | /** |
| 2805 | * Get the name of the SYSCS_UTIL schema. |
| 2806 | * |
| 2807 | * @return A String containing the name of the SYSIBM schema. |
| 2808 | * @throws StandardException |
| 2809 | */ |
| 2810 | public String getSystemUtilSchemaName() throws StandardException |
| 2811 | { |
| 2812 | return( |
| 2813 | convertIdentifierCase( |
| 2814 | SchemaDescriptor.STD_SYSTEM_UTIL_SCHEMA_NAME)); |
| 2815 | } |
| 2816 | |
| 2817 | /** |
| 2818 | * Get the declared global temporary tables schema name. |
| 2819 | * |
| 2820 | * @return a String containing the declared global temporary tables schema name. |
| 2821 | * @throws StandardException |
| 2822 | */ |
| 2823 | public String getDeclaredGlobalTemporaryTablesSchemaName() throws StandardException |
| 2824 | { |
| 2825 | return convertIdentifierCase( SchemaDescriptor.STD_DECLARED_GLOBAL_TEMPORARY_TABLES_SCHEMA_NAME); |
| 2826 | } |
| 2827 | |
| 2828 | public DataDictionary getDataDictionary() |
| 2829 | { |
| 2830 | DataDictionaryContext ddc = |
| 2831 | (DataDictionaryContext) getContextManager().getContext(DataDictionaryContext.CONTEXT_ID); |
| 2832 | |
| 2833 | if (ddc != null) |
| 2834 | { |
| 2835 | return ddc.getDataDictionary(); |
| 2836 | } |
| 2837 | else |
| 2838 | { |
| 2839 | return null; |
| 2840 | } |
| 2841 | } |
| 2842 | |
| 2843 | /** |
| 2844 | @see LanguageConnectionContext#setReadOnly |
| 2845 | @exception StandardException The operation is disallowed. |
| 2846 | */ |
| 2847 | public void setReadOnly(boolean on) throws StandardException |
| 2848 | { |
| 2849 | if (!tran.isPristine()) |
| 2850 | throw StandardException.newException(SQLState.AUTH_SET_CONNECTION_READ_ONLY_IN_ACTIVE_XACT); |
| 2851 | authorizer.setReadOnlyConnection(on,true); |
| 2852 | } |
| 2853 | |
| 2854 | /** |
| 2855 | @see LanguageConnectionContext#isReadOnly |
| 2856 | */ |
| 2857 | public boolean isReadOnly() |
| 2858 | { |
| 2859 | return authorizer.isReadOnlyConnection(); |
| 2860 | } |
| 2861 | |
| 2862 | /** |
| 2863 | @see LanguageConnectionContext#getAuthorizer |
| 2864 | */ |
| 2865 | public Authorizer getAuthorizer() |
| 2866 | { |
| 2867 | return authorizer; |
| 2868 | } |
| 2869 | |
| 2870 | /** @see LanguageConnectionContext#getAccessFactory */ |
| 2871 | public AccessFactory getAccessFactory() |
| 2872 | { |
| 2873 | return af; |
| 2874 | } |
| 2875 | |
| 2876 | /** |
| 2877 | * Implements ConnectionInfo.lastAutoincrementValue. |
| 2878 | * lastAutoincrementValue searches for the last autoincrement value inserted |
| 2879 | * into a column specified by the user. The search for the "last" value |
| 2880 | * supports nesting levels caused by triggers (Only triggers cause nesting, |
| 2881 | * not server side JDBC). |
| 2882 | * If lastAutoincrementValue is called from within a trigger, the search |
| 2883 | * space for ai-values are those values that are inserted by this trigger as |
| 2884 | * well as previous triggers; |
| 2885 | * i.e if a SQL statement fires trigger T1, which in turn does something |
| 2886 | * that fires trigger t2, and if lastAutoincrementValue is called from |
| 2887 | * within t2, then autoincrement values genereated by t1 are visible to |
| 2888 | * it. By the same logic, if it is called from within t1, then it does not |
| 2889 | * see values inserted by t2. |
| 2890 | * |
| 2891 | * @see LanguageConnectionContext#lastAutoincrementValue |
| 2892 | * @see org.apache.derby.iapi.db.ConnectionInfo#lastAutoincrementValue |
| 2893 | */ |
| 2894 | public Long lastAutoincrementValue(String schemaName, String tableName, |
| 2895 | String columnName) |
| 2896 | { |
| 2897 | String aiKey = AutoincrementCounter.makeIdentity(schemaName, tableName, columnName); |
| 2898 | |
| 2899 | int size = triggerExecutionContexts.size(); |
| 2900 | // System.out.println(" searching for " + aiKey); |
| 2901 | for (int i = size - 1; i >= 0; i--) |
| 2902 | { |
| 2903 | // first loop through triggers. |
| 2904 | InternalTriggerExecutionContext itec = |
| 2905 | (InternalTriggerExecutionContext)triggerExecutionContexts.elementAt(i); |
| 2906 | Long value = itec.getAutoincrementValue(aiKey); |
| 2907 | if (value == null) |
| 2908 | continue; |
| 2909 | |
| 2910 | return value; |
| 2911 | } |
| 2912 | if (autoincrementHT == null) |
| 2913 | return null; |
| 2914 | return (Long)autoincrementHT.get(aiKey); |
| 2915 | } |
| 2916 | |
| 2917 | /** |
| 2918 | * @see LanguageConnectionContext#setAutoincrementUpdate |
| 2919 | */ |
| 2920 | public void setAutoincrementUpdate(boolean flag) |
| 2921 | { |
| 2922 | autoincrementUpdate = flag; |
| 2923 | } |
| 2924 | |
| 2925 | /** |
| 2926 | * @see LanguageConnectionContext#getAutoincrementUpdate |
| 2927 | */ |
| 2928 | public boolean getAutoincrementUpdate() |
| 2929 | { |
| 2930 | return autoincrementUpdate; |
| 2931 | } |
| 2932 | |
| 2933 | /** |
| 2934 | * @see LanguageConnectionContext#autoincrementCreateCounter |
| 2935 | */ |
| 2936 | public void autoincrementCreateCounter(String s, String t, String c, |
| 2937 | Long initialValue, long increment, |
| 2938 | int position) |
| 2939 | { |
| 2940 | String key = AutoincrementCounter.makeIdentity(s,t,c); |
| 2941 | |
| 2942 | if (autoincrementCacheHashtable == null) |
| 2943 | { |
| 2944 | autoincrementCacheHashtable = new Hashtable(); |
| 2945 | } |
| 2946 | |
| 2947 | AutoincrementCounter aic = |
| 2948 | (AutoincrementCounter)autoincrementCacheHashtable.get(key); |
| 2949 | if (aic != null) |
| 2950 | { |
| 2951 | if (SanityManager.DEBUG) |
| 2952 | { |
| 2953 | SanityManager.THROWASSERT( |
| 2954 | "Autoincrement Counter already exists:" + key); |
| 2955 | } |
| 2956 | return; |
| 2957 | } |
| 2958 | |
| 2959 | aic = new AutoincrementCounter(initialValue, |
| 2960 | increment, 0, s, t, c, position); |
| 2961 | autoincrementCacheHashtable.put(key, aic); |
| 2962 | } |
| 2963 | |
| 2964 | /** |
| 2965 | * returns the <b>next</b> value to be inserted into an autoincrement col. |
| 2966 | * This is used internally by the system to generate autoincrement values |
| 2967 | * which are going to be inserted into a autoincrement column. This is |
| 2968 | * used when as autoincrement column is added to a table by an alter |
| 2969 | * table statemenet and during bulk insert. |
| 2970 | * |
| 2971 | * @param schemaName |
| 2972 | * @param tableName |
| 2973 | * @param columnName identify the column uniquely in the system. |
| 2974 | */ |
| 2975 | public long nextAutoincrementValue(String schemaName, String tableName, |
| 2976 | String columnName) |
| 2977 | throws StandardException |
| 2978 | { |
| 2979 | String key = AutoincrementCounter.makeIdentity(schemaName,tableName, |
| 2980 | columnName); |
| 2981 | |
| 2982 | AutoincrementCounter aic = |
| 2983 | (AutoincrementCounter)autoincrementCacheHashtable.get(key); |
| 2984 | |
| 2985 | if (aic == null) |
| 2986 | { |
| 2987 | if (SanityManager.DEBUG) |
| 2988 | { |
| 2989 | SanityManager.THROWASSERT("counter doesn't exist:" + key); |
| 2990 | } |
| 2991 | return 0; |
| 2992 | } |
| 2993 | else |
| 2994 | { |
| 2995 | return aic.update(); |
| 2996 | } |
| 2997 | } |
| 2998 | |
| 2999 | /** |
| 3000 | * Flush the cache of autoincrement values being kept by the lcc. |
| 3001 | * This will result in the autoincrement values being written to the |
| 3002 | * SYSCOLUMNS table as well as the mapping used by lastAutoincrementValue |
| 3003 | * |
| 3004 | * @exception StandardException thrown on error. |
| 3005 | * @see LanguageConnectionContext#lastAutoincrementValue |
| 3006 | * @see GenericLanguageConnectionContext#lastAutoincrementValue |
| 3007 | * @see org.apache.derby.iapi.db.ConnectionInfo#lastAutoincrementValue |
| 3008 | */ |
| 3009 | public void autoincrementFlushCache(UUID tableUUID) |
| 3010 | throws StandardException |
| 3011 | { |
| 3012 | if (autoincrementCacheHashtable == null) |
| 3013 | return; |
| 3014 | |
| 3015 | if (autoincrementHT == null) |
| 3016 | autoincrementHT = new Hashtable(); |
| 3017 | |
| 3018 | DataDictionary dd = getDataDictionary(); |
| 3019 | for (Enumeration e = autoincrementCacheHashtable.keys(); |
| 3020 | e.hasMoreElements(); ) |
| 3021 | { |
| 3022 | Object key = e.nextElement(); |
| 3023 | AutoincrementCounter aic = |
| 3024 | (AutoincrementCounter)autoincrementCacheHashtable.get(key); |
| 3025 | Long value = aic.getCurrentValue(); |
| 3026 | aic.flushToDisk(getTransactionExecute(), dd, tableUUID); |
| 3027 | if (value != null) |
| 3028 | { |
| 3029 | autoincrementHT.put(key, value); |
| 3030 | } |
| 3031 | } |
| 3032 | autoincrementCacheHashtable.clear(); |
| 3033 | } |
| 3034 | |
| 3035 | /** |
| 3036 | * Copies an existing hashtable of autoincrement mappings |
| 3037 | * into autoincrementHT, the cache of autoincrement values |
| 3038 | * kept in the languageconnectioncontext. |
| 3039 | */ |
| 3040 | public void copyHashtableToAIHT(Hashtable from) |
| 3041 | { |
| 3042 | if (from.isEmpty()) |
| 3043 | return; |
| 3044 | if (autoincrementHT == null) |
| 3045 | autoincrementHT = new Hashtable(); |
| 3046 | |
| 3047 | for (Enumeration e = from.keys(); e.hasMoreElements(); ) |
| 3048 | { |
| 3049 | Object key = e.nextElement(); |
| 3050 | Object value = from.get(key); |
| 3051 | autoincrementHT.put(key, value); |
| 3052 | } |
| 3053 | } |
| 3054 | |
| 3055 | /** |
| 3056 | * @see LanguageConnectionContext#getInstanceNumber |
| 3057 | */ |
| 3058 | public int getInstanceNumber() |
| 3059 | { |
| 3060 | return instanceNumber; |
| 3061 | } |
| 3062 | |
| 3063 | /** |
| 3064 | * @see LanguageConnectionContext#getDrdaID |
| 3065 | */ |
| 3066 | public String getDrdaID() |
| 3067 | { |
| 3068 | return drdaID; |
| 3069 | } |
| 3070 | |
| 3071 | /** |
| 3072 | * @see LanguageConnectionContext#setDrdaID |
| 3073 | */ |
| 3074 | public void setDrdaID(String drdaID) |
| 3075 | { |
| 3076 | this.drdaID = drdaID; |
| 3077 | } |
| 3078 | |
| 3079 | /** |
| 3080 | * @see LanguageConnectionContext#getDbname |
| 3081 | */ |
| 3082 | public String getDbname() |
| 3083 | { |
| 3084 | return dbname; |
| 3085 | } |
| 3086 | |
| 3087 | /** |
| 3088 | * @see LanguageConnectionContext#getLastActivation |
| 3089 | */ |
| 3090 | public Activation getLastActivation() |
| 3091 | { |
| 3092 | return (Activation)acts.lastElement(); |
| 3093 | } |
| 3094 | |
| 3095 | public StringBuffer appendErrorInfo() { |
| 3096 | |
| 3097 | TransactionController tc = getTransactionExecute(); |
| 3098 | if (tc == null) |
| 3099 | return null; |
| 3100 | |
| 3101 | StringBuffer sb = new StringBuffer(200); |
| 3102 | |
| 3103 | sb.append(LanguageConnectionContext.xidStr); |
| 3104 | sb.append(tc.getTransactionIdString()); |
| 3105 | sb.append("), "); |
| 3106 | |
| 3107 | sb.append(LanguageConnectionContext.lccStr); |
| 3108 | sb.append(Integer.toString(getInstanceNumber())); |
| 3109 | sb.append("), "); |
| 3110 | |
| 3111 | sb.append(LanguageConnectionContext.dbnameStr); |
| 3112 | sb.append(getDbname()); |
| 3113 | sb.append("), "); |
| 3114 | |
| 3115 | sb.append(LanguageConnectionContext.drdaStr); |
| 3116 | sb.append(getDrdaID()); |
| 3117 | sb.append("), "); |
| 3118 | |
| 3119 | return sb; |
| 3120 | } |
| 3121 | } |