| 1 | /* |
| 2 | |
| 3 | Derby - Class org.apache.derby.impl.jdbc.EmbedConnection |
| 4 | |
| 5 | Copyright 1997, 2005 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.jdbc; |
| 22 | |
| 23 | import org.apache.derby.jdbc.InternalDriver; |
| 24 | |
| 25 | import org.apache.derby.iapi.reference.Attribute; |
| 26 | import org.apache.derby.iapi.reference.JDBC20Translation; |
| 27 | import org.apache.derby.iapi.reference.JDBC30Translation; |
| 28 | import org.apache.derby.iapi.reference.MessageId; |
| 29 | import org.apache.derby.iapi.reference.Property; |
| 30 | import org.apache.derby.iapi.reference.SQLState; |
| 31 | |
| 32 | import org.apache.derby.iapi.services.context.ContextManager; |
| 33 | import org.apache.derby.iapi.services.memory.LowMemory; |
| 34 | import org.apache.derby.iapi.services.monitor.Monitor; |
| 35 | import org.apache.derby.iapi.services.sanity.SanityManager; |
| 36 | |
| 37 | import org.apache.derby.iapi.jdbc.AuthenticationService; |
| 38 | import org.apache.derby.iapi.jdbc.EngineConnection; |
| 39 | |
| 40 | import org.apache.derby.iapi.db.Database; |
| 41 | import org.apache.derby.iapi.error.StandardException; |
| 42 | import org.apache.derby.iapi.services.i18n.MessageService; |
| 43 | import org.apache.derby.iapi.sql.conn.LanguageConnectionContext; |
| 44 | import org.apache.derby.iapi.sql.execute.ExecutionContext; |
| 45 | import org.apache.derby.iapi.sql.dictionary.DataDictionary; |
| 46 | import org.apache.derby.iapi.store.access.XATransactionController; |
| 47 | |
| 48 | /* can't import due to name overlap: |
| 49 | import java.sql.Connection; |
| 50 | import java.sql.ResultSet; |
| 51 | */ |
| 52 | import java.sql.PreparedStatement; |
| 53 | import java.sql.CallableStatement; |
| 54 | import java.sql.DatabaseMetaData; |
| 55 | import java.sql.SQLException; |
| 56 | import java.sql.SQLWarning; |
| 57 | import java.sql.Statement; |
| 58 | |
| 59 | import java.util.Properties; |
| 60 | |
| 61 | /** |
| 62 | * Local implementation of Connection for a JDBC driver in |
| 63 | * the same process as the database. |
| 64 | * <p> |
| 65 | * There is always a single root (parent) connection. The |
| 66 | * initial JDBC connection is the root connection. A |
| 67 | * call to <I>getCurrentConnection()</I> or with the URL |
| 68 | * <I>jdbc:default:connection</I> yields a nested connection that shares |
| 69 | * the same root connection as the parent. A nested connection |
| 70 | * is implemented using this class. The nested connection copies the |
| 71 | * state of the parent connection and shares some of the same |
| 72 | * objects (e.g. ContextManager) that are shared across all |
| 73 | * nesting levels. The proxy also maintains its own |
| 74 | * state that is distinct from its parent connection (e.g. |
| 75 | * autocommit or warnings). |
| 76 | * <p> |
| 77 | * <B>SYNCHRONIZATION</B>: Just about all JDBC actions are |
| 78 | * synchronized across all connections stemming from the |
| 79 | * same root connection. The synchronization is upon |
| 80 | * the a synchronized object return by the rootConnection. |
| 81 | <P><B>Supports</B> |
| 82 | <UL> |
| 83 | <LI> JDBC 2.0 |
| 84 | </UL> |
| 85 | * |
| 86 | * @author djd |
| 87 | * |
| 88 | * @see TransactionResourceImpl |
| 89 | * |
| 90 | */ |
| 91 | public class EmbedConnection implements EngineConnection |
| 92 | { |
| 93 | |
| 94 | private static final StandardException exceptionClose = StandardException.closeException(); |
| 95 | |
| 96 | /** |
| 97 | * Static exception to be thrown when a Connection request can not |
| 98 | * be fulfilled due to lack of memory. A static exception as the lack |
| 99 | * of memory would most likely cause another OutOfMemoryException and |
| 100 | * if there is not enough memory to create the OOME exception then something |
| 101 | * like the VM dying could occur. Simpler just to throw a static. |
| 102 | */ |
| 103 | public static final SQLException NO_MEM = |
| 104 | Util.generateCsSQLException(SQLState.LOGIN_FAILED, "java.lang.OutOfMemoryError"); |
| 105 | |
| 106 | /** |
| 107 | * Low memory state object for connection requests. |
| 108 | */ |
| 109 | public static final LowMemory memoryState = new LowMemory(); |
| 110 | |
| 111 | ////////////////////////////////////////////////////////// |
| 112 | // OBJECTS SHARED ACROSS CONNECTION NESTING |
| 113 | ////////////////////////////////////////////////////////// |
| 114 | DatabaseMetaData dbMetadata; |
| 115 | |
| 116 | final TransactionResourceImpl tr; // always access tr thru getTR() |
| 117 | |
| 118 | |
| 119 | ////////////////////////////////////////////////////////// |
| 120 | // STATE (copied to new nested connections, but nesting |
| 121 | // specific) |
| 122 | ////////////////////////////////////////////////////////// |
| 123 | private boolean active; |
| 124 | boolean autoCommit = true; |
| 125 | boolean needCommit; |
| 126 | /* |
| 127 | following is a new feature in JDBC3.0 where you can specify the holdability |
| 128 | of a resultset at the end of the transaction. This gets set by the |
| 129 | new method setHoldability(int) in JDBC3.0 |
| 130 | * |
| 131 | */ |
| 132 | private int connectionHoldAbility = JDBC30Translation.HOLD_CURSORS_OVER_COMMIT; |
| 133 | |
| 134 | |
| 135 | ////////////////////////////////////////////////////////// |
| 136 | // NESTING SPECIFIC OBJECTS |
| 137 | ////////////////////////////////////////////////////////// |
| 138 | /* |
| 139 | ** The root connection is the base connection upon |
| 140 | ** which all actions are synchronized. By default, |
| 141 | ** we are the root connection unless we are created |
| 142 | ** by copying the state from another connection. |
| 143 | */ |
| 144 | final EmbedConnection rootConnection; |
| 145 | private SQLWarning topWarning; |
| 146 | /** |
| 147 | Factory for JDBC objects to be created. |
| 148 | */ |
| 149 | private InternalDriver factory; |
| 150 | |
| 151 | /** |
| 152 | The Connection object the application is using when accessing the |
| 153 | database through this connection. In most cases this will be equal |
| 154 | to this. When Connection pooling is being used, then it will |
| 155 | be set to the Connection object handed to the application. |
| 156 | It is used for the getConnection() methods of various JDBC objects. |
| 157 | */ |
| 158 | private java.sql.Connection applicationConnection; |
| 159 | |
| 160 | /** |
| 161 | An increasing counter to assign to a ResultSet on its creation. |
| 162 | Used for ordering ResultSets returned from a procedure, always |
| 163 | returned in order of their creation. Is maintained at the root connection. |
| 164 | */ |
| 165 | private int resultSetId; |
| 166 | |
| 167 | /** Cached string representation of the connection id */ |
| 168 | private String connString; |
| 169 | |
| 170 | |
| 171 | ////////////////////////////////////////////////////////// |
| 172 | // CONSTRUCTORS |
| 173 | ////////////////////////////////////////////////////////// |
| 174 | |
| 175 | // create a new Local Connection, using a new context manager |
| 176 | // |
| 177 | public EmbedConnection(InternalDriver driver, String url, Properties info) |
| 178 | throws SQLException |
| 179 | { |
| 180 | // Create a root connection. |
| 181 | applicationConnection = rootConnection = this; |
| 182 | factory = driver; |
| 183 | |
| 184 | |
| 185 | tr = new TransactionResourceImpl(driver, url, info); |
| 186 | |
| 187 | active = true; |
| 188 | |
| 189 | // register this thread and its context manager with |
| 190 | // the global context service |
| 191 | setupContextStack(); |
| 192 | |
| 193 | try { |
| 194 | |
| 195 | // stick my context into the context manager |
| 196 | EmbedConnectionContext context = pushConnectionContext(tr.getContextManager()); |
| 197 | |
| 198 | // if we are shutting down don't attempt to boot or create the database |
| 199 | boolean shutdown = Boolean.valueOf(info.getProperty(Attribute.SHUTDOWN_ATTR)).booleanValue(); |
| 200 | |
| 201 | // see if database is already booted |
| 202 | Database database = (Database) Monitor.findService(Property.DATABASE_MODULE, tr.getDBName()); |
| 203 | |
| 204 | // See if user wants to create a new database. |
| 205 | boolean createBoot = createBoot(info); |
| 206 | if (database != null) |
| 207 | { |
| 208 | // database already booted by someone else |
| 209 | tr.setDatabase(database); |
| 210 | } |
| 211 | else if (!shutdown) |
| 212 | { |
| 213 | // Return false iff the monitor cannot handle a service of the type |
| 214 | // indicated by the proptocol within the name. If that's the case |
| 215 | // then we are the wrong driver. |
| 216 | if (!bootDatabase(info)) |
| 217 | { |
| 218 | tr.clearContextInError(); |
| 219 | setInactive(); |
| 220 | return; |
| 221 | } |
| 222 | } |
| 223 | |
| 224 | |
| 225 | if (createBoot && !shutdown) |
| 226 | { |
| 227 | // if we are shutting down don't attempt to boot or create the database |
| 228 | |
| 229 | if (tr.getDatabase() != null) { |
| 230 | addWarning(EmbedSQLWarning.newEmbedSQLWarning(SQLState.DATABASE_EXISTS, getDBName())); |
| 231 | } else { |
| 232 | |
| 233 | // check for user's credential and authenticate the user |
| 234 | // with system level authentication service. |
| 235 | // FIXME: We should also check for CREATE DATABASE operation |
| 236 | // authorization for the user if authorization was |
| 237 | // set at the system level. |
| 238 | // Right now, the authorization service does not |
| 239 | // restrict/account for Create database op. |
| 240 | checkUserCredentials(null, info); |
| 241 | |
| 242 | // Process with database creation |
| 243 | database = createDatabase(tr.getDBName(), info); |
| 244 | tr.setDatabase(database); |
| 245 | } |
| 246 | } |
| 247 | |
| 248 | |
| 249 | if (tr.getDatabase() == null) { |
| 250 | String dbname = tr.getDBName(); |
| 251 | // do not clear the TransactionResource context. It will be restored |
| 252 | // as part of the finally clause below. |
| 253 | this.setInactive(); |
| 254 | throw newSQLException(SQLState.DATABASE_NOT_FOUND, dbname); |
| 255 | } |
| 256 | |
| 257 | |
| 258 | // Check User's credentials and if it is a valid user of |
| 259 | // the database |
| 260 | // |
| 261 | checkUserCredentials(tr.getDBName(), info); |
| 262 | |
| 263 | // Make a real connection into the database, setup lcc, tc and all |
| 264 | // the rest. |
| 265 | tr.startTransaction(); |
| 266 | |
| 267 | // now we have the database connection, we can shut down |
| 268 | if (shutdown) { |
| 269 | throw tr.shutdownDatabaseException(); |
| 270 | } |
| 271 | |
| 272 | } |
| 273 | catch (OutOfMemoryError noMemory) |
| 274 | { |
| 275 | //System.out.println("freeA"); |
| 276 | restoreContextStack(); |
| 277 | tr.lcc = null; |
| 278 | tr.cm = null; |
| 279 | |
| 280 | //System.out.println("free"); |
| 281 | //System.out.println(Runtime.getRuntime().freeMemory()); |
| 282 | memoryState.setLowMemory(); |
| 283 | |
| 284 | //noMemory.printStackTrace(); |
| 285 | // throw Util.generateCsSQLException(SQLState.LOGIN_FAILED, noMemory.getMessage(), noMemory); |
| 286 | throw NO_MEM; |
| 287 | } |
| 288 | catch (Throwable t) { |
| 289 | throw handleException(t); |
| 290 | } finally { |
| 291 | restoreContextStack(); |
| 292 | } |
| 293 | } |
| 294 | |
| 295 | |
| 296 | /** |
| 297 | Examine the attributes set provided and determine if this is a create |
| 298 | boot. A boot is a create boot iff. |
| 299 | |
| 300 | <OL> |
| 301 | <LI>create=true - This means create a standard database. |
| 302 | <LI> createFrom = Path - creates database from backup if it does not exist. |
| 303 | <LI> restoreFrom = Path - database is restored completley from backup. |
| 304 | if a database exists in the same place it is replaced by the version |
| 305 | in the backup otherwise a new one is created using the backup copy. |
| 306 | <LI> rollForwardRecoveryFrom = Path - rollforward is performed |
| 307 | using the version backup and any active and archived log files. |
| 308 | </OL> |
| 309 | |
| 310 | @param p the attribute set. |
| 311 | |
| 312 | @exception SQLException Ooops. |
| 313 | */ |
| 314 | private boolean createBoot(Properties p) throws SQLException |
| 315 | { |
| 316 | int createCount = 0; |
| 317 | |
| 318 | if (Boolean.valueOf(p.getProperty(Attribute.CREATE_ATTR)).booleanValue()) |
| 319 | createCount++; |
| 320 | |
| 321 | int restoreCount=0; |
| 322 | //check if the user has specified any /create/restore/recover from backup attributes. |
| 323 | if (p.getProperty(Attribute.CREATE_FROM) != null) |
| 324 | restoreCount++; |
| 325 | if (p.getProperty(Attribute.RESTORE_FROM) != null) |
| 326 | restoreCount++; |
| 327 | if (p.getProperty(Attribute.ROLL_FORWARD_RECOVERY_FROM)!=null) |
| 328 | restoreCount++; |
| 329 | if(restoreCount > 1) |
| 330 | throw newSQLException(SQLState.CONFLICTING_RESTORE_ATTRIBUTES); |
| 331 | |
| 332 | //add the restore count to create count to make sure |
| 333 | //user has not specified and restore together by mistake. |
| 334 | createCount = createCount + restoreCount ; |
| 335 | |
| 336 | // |
| 337 | if (createCount > 1) throw newSQLException(SQLState.CONFLICTING_CREATE_ATTRIBUTES); |
| 338 | |
| 339 | //retuns true only for the create flag not for restore flags |
| 340 | return (createCount - restoreCount) == 1; |
| 341 | } |
| 342 | |
| 343 | /** |
| 344 | * Create a new connection based off of the |
| 345 | * connection passed in. Initializes state |
| 346 | * based on input connection, and copies |
| 347 | * appropriate object pointers. This is only used |
| 348 | for nested connections. |
| 349 | * |
| 350 | * @param inputConnection the input connection |
| 351 | */ |
| 352 | public EmbedConnection(EmbedConnection inputConnection) |
| 353 | { |
| 354 | if (SanityManager.DEBUG) |
| 355 | { |
| 356 | SanityManager.ASSERT(inputConnection.active, |
| 357 | "trying to create a proxy for an inactive conneciton"); |
| 358 | } |
| 359 | |
| 360 | // Proxy connections are always autocommit false |
| 361 | // thus needCommit is irrelavent. |
| 362 | autoCommit = false; |
| 363 | |
| 364 | |
| 365 | /* |
| 366 | ** Nesting specific state we are copying from |
| 367 | ** the inputConnection |
| 368 | */ |
| 369 | |
| 370 | /* |
| 371 | ** Objects we are sharing across nestings |
| 372 | */ |
| 373 | // set it to null to allow it to be final. |
| 374 | tr = null; // a proxy connection has no direct |
| 375 | // pointer to the tr. Every call has to go |
| 376 | // thru the rootConnection's tr. |
| 377 | active = true; |
| 378 | this.rootConnection = inputConnection.rootConnection; |
| 379 | this.applicationConnection = this; |
| 380 | this.factory = inputConnection.factory; |
| 381 | |
| 382 | //if no holdability specified for the resultset, use the holability |
| 383 | //defined for the connection |
| 384 | this.connectionHoldAbility = inputConnection.connectionHoldAbility; |
| 385 | |
| 386 | //RESOLVE: although it looks like the right |
| 387 | // thing to share the metadata object, if |
| 388 | // we do we'll get the wrong behavior on |
| 389 | // getCurrentConnection().getMetaData().isReadOnly() |
| 390 | // so don't try to be smart and uncomment the |
| 391 | // following. Ultimately, the metadata should |
| 392 | // be shared by all connections anyway. |
| 393 | //dbMetadata = inputConnection.dbMetadata; |
| 394 | } |
| 395 | |
| 396 | // |
| 397 | // Check passed-in user's credentials. |
| 398 | // |
| 399 | private void checkUserCredentials(String dbname, |
| 400 | Properties userInfo) |
| 401 | throws SQLException |
| 402 | { |
| 403 | if (SanityManager.DEBUG) |
| 404 | SanityManager.ASSERT(!isClosed(), "connection is closed"); |
| 405 | |
| 406 | // If a database name was passed-in then check user's credential |
| 407 | // in that database using the database's authentication service, |
| 408 | // otherwise check if it is a valid user in the JBMS system. |
| 409 | // |
| 410 | // NOTE: We always expect an authentication service per database |
| 411 | // and one at the system level. |
| 412 | // |
| 413 | AuthenticationService authenticationService = null; |
| 414 | |
| 415 | // Retrieve appropriate authentication service handle |
| 416 | if (dbname == null) |
| 417 | authenticationService = getLocalDriver().getAuthenticationService(); |
| 418 | else |
| 419 | authenticationService = getTR().getDatabase().getAuthenticationService(); |
| 420 | |
| 421 | // check that we do have a authentication service |
| 422 | // it is _always_ expected. |
| 423 | if (authenticationService == null) |
| 424 | { |
| 425 | String failedString = MessageService.getTextMessage( |
| 426 | (dbname == null) ? MessageId.AUTH_NO_SERVICE_FOR_SYSTEM : MessageId.AUTH_NO_SERVICE_FOR_DB); |
| 427 | |
| 428 | throw newSQLException(SQLState.LOGIN_FAILED, failedString); |
| 429 | } |
| 430 | |
| 431 | // Let's authenticate now |
| 432 | |
| 433 | if (!authenticationService.authenticate( |
| 434 | dbname, |
| 435 | userInfo |
| 436 | )) { |
| 437 | |
| 438 | throw newSQLException(SQLState.LOGIN_FAILED, MessageService.getTextMessage(MessageId.AUTH_INVALID)); |
| 439 | |
| 440 | } |
| 441 | } |
| 442 | |
| 443 | /** |
| 444 | * Gets the EngineType of the connected database. |
| 445 | * |
| 446 | * @return 0 if there is no database, the engine type otherwise. @see org.apache.derby.iapi.reference.EngineType |
| 447 | */ |
| 448 | public int getEngineType() |
| 449 | { |
| 450 | Database db = getDatabase(); |
| 451 | |
| 452 | if( null == db) |
| 453 | return 0; |
| 454 | return db.getEngineType(); |
| 455 | } |
| 456 | |
| 457 | /* |
| 458 | ** Methods from java.sql.Connection |
| 459 | */ |
| 460 | |
| 461 | /** |
| 462 | * SQL statements without parameters are normally |
| 463 | * executed using Statement objects. If the same SQL statement |
| 464 | * is executed many times, it is more efficient to use a |
| 465 | * PreparedStatement |
| 466 | * |
| 467 | * JDBC 2.0 |
| 468 | * |
| 469 | * Result sets created using the returned Statement will have |
| 470 | * forward-only type, and read-only concurrency, by default. |
| 471 | * |
| 472 | * @return a new Statement object |
| 473 | * @exception SQLException if a database-access error occurs. |
| 474 | */ |
| 475 | public final Statement createStatement() throws SQLException |
| 476 | { |
| 477 | return createStatement(JDBC20Translation.TYPE_FORWARD_ONLY, |
| 478 | JDBC20Translation.CONCUR_READ_ONLY, |
| 479 | connectionHoldAbility); |
| 480 | } |
| 481 | |
| 482 | /** |
| 483 | * JDBC 2.0 |
| 484 | * |
| 485 | * Same as createStatement() above, but allows the default result set |
| 486 | * type and result set concurrency type to be overridden. |
| 487 | * |
| 488 | * @param resultSetType a result set type, see ResultSet.TYPE_XXX |
| 489 | * @param resultSetConcurrency a concurrency type, see ResultSet.CONCUR_XXX |
| 490 | * @return a new Statement object |
| 491 | * @exception SQLException if a database-access error occurs. |
| 492 | */ |
| 493 | public final Statement createStatement(int resultSetType, |
| 494 | int resultSetConcurrency) |
| 495 | throws SQLException |
| 496 | { |
| 497 | return createStatement(resultSetType, resultSetConcurrency, |
| 498 | connectionHoldAbility); |
| 499 | } |
| 500 | |
| 501 | /** |
| 502 | * JDBC 3.0 |
| 503 | * |
| 504 | * Same as createStatement() above, but allows the default result set |
| 505 | * type, result set concurrency type and result set holdability type to |
| 506 | * be overridden. |
| 507 | * |
| 508 | * @param resultSetType a result set type, see ResultSet.TYPE_XXX |
| 509 | * @param resultSetConcurrency a concurrency type, see ResultSet.CONCUR_XXX |
| 510 | * @param resultSetHoldability a holdability type, |
| 511 | * ResultSet.HOLD_CURSORS_OVER_COMMIT or ResultSet.CLOSE_CURSORS_AT_COMMIT |
| 512 | * @return a new Statement object |
| 513 | * @exception SQLException if a database-access error occurs. |
| 514 | */ |
| 515 | public final Statement createStatement(int resultSetType, |
| 516 | int resultSetConcurrency, |
| 517 | int resultSetHoldability) |
| 518 | throws SQLException |
| 519 | { |
| 520 | checkIfClosed(); |
| 521 | |
| 522 | return factory.newEmbedStatement(this, false, |
| 523 | setResultSetType(resultSetType), resultSetConcurrency, |
| 524 | resultSetHoldability); |
| 525 | } |
| 526 | |
| 527 | /** |
| 528 | * A SQL statement with or without IN parameters can be |
| 529 | * pre-compiled and stored in a PreparedStatement object. This |
| 530 | * object can then be used to efficiently execute this statement |
| 531 | * multiple times. |
| 532 | * |
| 533 | * <P><B>Note:</B> This method is optimized for handling |
| 534 | * parametric SQL statements that benefit from precompilation. If |
| 535 | * the driver supports precompilation, prepareStatement will send |
| 536 | * the statement to the database for precompilation. Some drivers |
| 537 | * may not support precompilation. In this case, the statement may |
| 538 | * not be sent to the database until the PreparedStatement is |
| 539 | * executed. This has no direct affect on users; however, it does |
| 540 | * affect which method throws certain SQLExceptions. |
| 541 | * |
| 542 | * JDBC 2.0 |
| 543 | * |
| 544 | * Result sets created using the returned PreparedStatement will have |
| 545 | * forward-only type, and read-only concurrency, by default. |
| 546 | * |
| 547 | * @param sql a SQL statement that may contain one or more '?' IN |
| 548 | * parameter placeholders |
| 549 | * @return a new PreparedStatement object containing the |
| 550 | * pre-compiled statement |
| 551 | * @exception SQLException if a database-access error occurs. |
| 552 | */ |
| 553 | public final PreparedStatement prepareStatement(String sql) |
| 554 | throws SQLException |
| 555 | { |
| 556 | return prepareStatement(sql,JDBC20Translation.TYPE_FORWARD_ONLY, |
| 557 | JDBC20Translation.CONCUR_READ_ONLY, |
| 558 | connectionHoldAbility, |
| 559 | JDBC30Translation.NO_GENERATED_KEYS, |
| 560 | null, |
| 561 | null); |
| 562 | } |
| 563 | |
| 564 | |
| 565 | /** |
| 566 | * JDBC 2.0 |
| 567 | * |
| 568 | * Same as prepareStatement() above, but allows the default result set |
| 569 | * type and result set concurrency type to be overridden. |
| 570 | * |
| 571 | * @param resultSetType a result set type, see ResultSet.TYPE_XXX |
| 572 | * @param resultSetConcurrency a concurrency type, see ResultSet.CONCUR_XXX |
| 573 | * @return a new PreparedStatement object containing the |
| 574 | * pre-compiled SQL statement |
| 575 | * @exception SQLException if a database-access error occurs. |
| 576 | */ |
| 577 | public final PreparedStatement prepareStatement(String sql, int resultSetType, |
| 578 | int resultSetConcurrency) |
| 579 | throws SQLException |
| 580 | { |
| 581 | return prepareStatement(sql, |
| 582 | resultSetType, |
| 583 | resultSetConcurrency, |
| 584 | connectionHoldAbility, |
| 585 | JDBC30Translation.NO_GENERATED_KEYS, |
| 586 | null, |
| 587 | null); |
| 588 | } |
| 589 | |
| 590 | /** |
| 591 | * JDBC 3.0 |
| 592 | * |
| 593 | * Same as prepareStatement() above, but allows the default result set |
| 594 | * type, result set concurrency type and result set holdability |
| 595 | * to be overridden. |
| 596 | * |
| 597 | * @param resultSetType a result set type, see ResultSet.TYPE_XXX |
| 598 | * @param resultSetConcurrency a concurrency type, see ResultSet.CONCUR_XXX |
| 599 | * @param resultSetHoldability - one of the following ResultSet constants: |
| 600 | * ResultSet.HOLD_CURSORS_OVER_COMMIT or ResultSet.CLOSE_CURSORS_AT_COMMIT |
| 601 | * @return a new PreparedStatement object containing the |
| 602 | * pre-compiled SQL statement |
| 603 | * @exception SQLException if a database-access error occurs. |
| 604 | */ |
| 605 | public final PreparedStatement prepareStatement(String sql, int resultSetType, |
| 606 | int resultSetConcurrency, int resultSetHoldability) |
| 607 | throws SQLException |
| 608 | { |
| 609 | return prepareStatement(sql, |
| 610 | resultSetType, |
| 611 | resultSetConcurrency, |
| 612 | resultSetHoldability, |
| 613 | JDBC30Translation.NO_GENERATED_KEYS, |
| 614 | null, |
| 615 | null); |
| 616 | } |
| 617 | |
| 618 | |
| 619 | /** |
| 620 | * Creates a default PreparedStatement object capable of returning |
| 621 | * the auto-generated keys designated by the given array. This array contains |
| 622 | * the indexes of the columns in the target table that contain the auto-generated |
| 623 | * keys that should be made available. This array is ignored if the SQL statement |
| 624 | * is not an INSERT statement |
| 625 | |
| 626 | JDBC 3.0 |
| 627 | * |
| 628 | * |
| 629 | * @param sql An SQL statement that may contain one or more ? IN parameter placeholders |
| 630 | * @param columnIndexes An array of column indexes indicating the columns |
| 631 | * that should be returned from the inserted row or rows |
| 632 | * |
| 633 | * @return A new PreparedStatement object, containing the pre-compiled |
| 634 | * SQL statement, that will have the capability of returning auto-generated keys |
| 635 | * designated by the given array of column indexes |
| 636 | * |
| 637 | * @exception SQLException Feature not implemented for now. |
| 638 | */ |
| 639 | public final PreparedStatement prepareStatement( |
| 640 | String sql, |
| 641 | int[] columnIndexes) |
| 642 | throws SQLException |
| 643 | { |
| 644 | throw Util.notImplemented("prepareStatement(String, int[])"); |
| 645 | } |
| 646 | |
| 647 | /** |
| 648 | * Creates a default PreparedStatement object capable of returning |
| 649 | * the auto-generated keys designated by the given array. This array contains |
| 650 | * the names of the columns in the target table that contain the auto-generated |
| 651 | * keys that should be returned. This array is ignored if the SQL statement |
| 652 | * is not an INSERT statement |
| 653 | * |
| 654 | JDBC 3.0 |
| 655 | * |
| 656 | * @param sql An SQL statement that may contain one or more ? IN parameter placeholders |
| 657 | * @param columnNames An array of column names indicating the columns |
| 658 | * that should be returned from the inserted row or rows |
| 659 | * |
| 660 | * @return A new PreparedStatement object, containing the pre-compiled |
| 661 | * SQL statement, that will have the capability of returning auto-generated keys |
| 662 | * designated by the given array of column names |
| 663 | * |
| 664 | * @exception SQLException Feature not implemented for now. |
| 665 | */ |
| 666 | public final PreparedStatement prepareStatement( |
| 667 | String sql, |
| 668 | String[] columnNames) |
| 669 | throws SQLException |
| 670 | { |
| 671 | throw Util.notImplemented("prepareStatement(String, String[])"); |
| 672 | } |
| 673 | |
| 674 | /** |
| 675 | * Creates a default PreparedStatement object that has the capability to |
| 676 | * retieve auto-generated keys. The given constant tells the driver |
| 677 | * whether it should make auto-generated keys available for retrieval. |
| 678 | * This parameter is ignored if the SQL statement is not an INSERT statement. |
| 679 | * JDBC 3.0 |
| 680 | * |
| 681 | * @param sql A SQL statement that may contain one or more ? IN parameter placeholders |
| 682 | * @param autoGeneratedKeys A flag indicating whether auto-generated keys |
| 683 | * should be returned |
| 684 | * |
| 685 | * @return A new PreparedStatement object, containing the pre-compiled |
| 686 | * SQL statement, that will have the capability of returning auto-generated keys |
| 687 | * |
| 688 | * @exception SQLException Feature not implemented for now. |
| 689 | */ |
| 690 | public final PreparedStatement prepareStatement( |
| 691 | String sql, |
| 692 | int autoGeneratedKeys) |
| 693 | throws SQLException |
| 694 | { |
| 695 | return prepareStatement(sql, |
| 696 | JDBC20Translation.TYPE_FORWARD_ONLY, |
| 697 | JDBC20Translation.CONCUR_READ_ONLY, |
| 698 | connectionHoldAbility, |
| 699 | autoGeneratedKeys, |
| 700 | null, |
| 701 | null); |
| 702 | } |
| 703 | |
| 704 | private PreparedStatement prepareStatement(String sql, int resultSetType, |
| 705 | int resultSetConcurrency, int resultSetHoldability, |
| 706 | int autoGeneratedKeys, int[] columnIndexes, String[] columnNames) |
| 707 | throws SQLException |
| 708 | { |
| 709 | synchronized (getConnectionSynchronization()) { |
| 710 | setupContextStack(); |
| 711 | try { |
| 712 | return factory.newEmbedPreparedStatement(this, sql, false, |
| 713 | setResultSetType(resultSetType), |
| 714 | resultSetConcurrency, |
| 715 | resultSetHoldability, |
| 716 | autoGeneratedKeys, |
| 717 | columnIndexes, |
| 718 | columnNames); |
| 719 | } finally { |
| 720 | restoreContextStack(); |
| 721 | } |
| 722 | } |
| 723 | } |
| 724 | |
| 725 | /** |
| 726 | * A SQL stored procedure call statement is handled by creating a |
| 727 | * CallableStatement for it. The CallableStatement provides |
| 728 | * methods for setting up its IN and OUT parameters, and |
| 729 | * methods for executing it. |
| 730 | * |
| 731 | * <P><B>Note:</B> This method is optimized for handling stored |
| 732 | * procedure call statements. Some drivers may send the call |
| 733 | * statement to the database when the prepareCall is done; others |
| 734 | * may wait until the CallableStatement is executed. This has no |
| 735 | * direct affect on users; however, it does affect which method |
| 736 | * throws certain SQLExceptions. |
| 737 | * |
| 738 | * JDBC 2.0 |
| 739 | * |
| 740 | * Result sets created using the returned CallableStatement will have |
| 741 | * forward-only type, and read-only concurrency, by default. |
| 742 | * |
| 743 | * @param sql a SQL statement that may contain one or more '?' |
| 744 | * parameter placeholders. Typically this statement is a JDBC |
| 745 | * function call escape string. |
| 746 | * @return a new CallableStatement object containing the |
| 747 | * pre-compiled SQL statement |
| 748 | * @exception SQLException if a database-access error occurs. |
| 749 | */ |
| 750 | public final CallableStatement prepareCall(String sql) |
| 751 | throws SQLException |
| 752 | { |
| 753 | return prepareCall(sql, JDBC20Translation.TYPE_FORWARD_ONLY, |
| 754 | JDBC20Translation.CONCUR_READ_ONLY, |
| 755 | connectionHoldAbility); |
| 756 | } |
| 757 | |
| 758 | /** |
| 759 | * JDBC 2.0 |
| 760 | * |
| 761 | * Same as prepareCall() above, but allows the default result set |
| 762 | * type and result set concurrency type to be overridden. |
| 763 | * |
| 764 | * @param resultSetType a result set type, see ResultSet.TYPE_XXX |
| 765 | * @param resultSetConcurrency a concurrency type, see ResultSet.CONCUR_XXX |
| 766 | * @return a new CallableStatement object containing the |
| 767 | * pre-compiled SQL statement |
| 768 | * @exception SQLException if a database-access error occurs. |
| 769 | */ |
| 770 | public final CallableStatement prepareCall(String sql, int resultSetType, |
| 771 | int resultSetConcurrency) |
| 772 | throws SQLException |
| 773 | { |
| 774 | return prepareCall(sql, resultSetType, resultSetConcurrency, |
| 775 | connectionHoldAbility); |
| 776 | } |
| 777 | |
| 778 | /** |
| 779 | * JDBC 3.0 |
| 780 | * |
| 781 | * Same as prepareCall() above, but allows the default result set |
| 782 | * type, result set concurrency type and result set holdability |
| 783 | * to be overridden. |
| 784 | * |
| 785 | * @param resultSetType a result set type, see ResultSet.TYPE_XXX |
| 786 | * @param resultSetConcurrency a concurrency type, see ResultSet.CONCUR_XXX |
| 787 | * @param resultSetHoldability - one of the following ResultSet constants: |
| 788 | * ResultSet.HOLD_CURSORS_OVER_COMMIT or ResultSet.CLOSE_CURSORS_AT_COMMIT |
| 789 | * @return a new CallableStatement object containing the |
| 790 | * pre-compiled SQL statement |
| 791 | * @exception SQLException if a database-access error occurs. |
| 792 | */ |
| 793 | public final CallableStatement prepareCall(String sql, int resultSetType, |
| 794 | int resultSetConcurrency, int resultSetHoldability) |
| 795 | throws SQLException |
| 796 | { |
| 797 | checkIfClosed(); |
| 798 | |
| 799 | synchronized (getConnectionSynchronization()) |
| 800 | { |
| 801 | setupContextStack(); |
| 802 | try |
| 803 | { |
| 804 | return factory.newEmbedCallableStatement(this, sql, |
| 805 | setResultSetType(resultSetType), |
| 806 | resultSetConcurrency, |
| 807 | resultSetHoldability); |
| 808 | } |
| 809 | finally |
| 810 | { |
| 811 | restoreContextStack(); |
| 812 | } |
| 813 | } |
| 814 | } |
| 815 | |
| 816 | /** |
| 817 | * A driver may convert the JDBC sql grammar into its system's |
| 818 | * native SQL grammar prior to sending it; nativeSQL returns the |
| 819 | * native form of the statement that the driver would have sent. |
| 820 | * |
| 821 | * @param sql a SQL statement that may contain one or more '?' |
| 822 | * parameter placeholders |
| 823 | * @return the native form of this statement |
| 824 | */ |
| 825 | public String nativeSQL(String sql) throws SQLException { |
| 826 | checkIfClosed(); |
| 827 | // we don't massage the strings at all, so this is easy: |
| 828 | return sql; |
| 829 | } |
| 830 | |
| 831 | /** |
| 832 | * If a connection is in auto-commit mode, then all its SQL |
| 833 | * statements will be executed and committed as individual |
| 834 | * transactions. Otherwise, its SQL statements are grouped into |
| 835 | * transactions that are terminated by either commit() or |
| 836 | * rollback(). By default, new connections are in auto-commit |
| 837 | * mode. |
| 838 | * |
| 839 | * The commit occurs when the statement completes or the next |
| 840 | * execute occurs, whichever comes first. In the case of |
| 841 | * statements returning a ResultSet, the statement completes when |
| 842 | * the last row of the ResultSet has been retrieved or the |
| 843 | * ResultSet has been closed. In advanced cases, a single |
| 844 | * statement may return multiple results as well as output |
| 845 | * parameter values. Here the commit occurs when all results and |
| 846 | * output param values have been retrieved. |
| 847 | * |
| 848 | * @param autoCommit true enables auto-commit; false disables |
| 849 | * auto-commit. |
| 850 | * @exception SQLException if a database-access error occurs. |
| 851 | */ |
| 852 | public void setAutoCommit(boolean autoCommit) throws SQLException { |
| 853 | checkIfClosed(); |
| 854 | |
| 855 | // Is this a nested connection |
| 856 | if (rootConnection != this) { |
| 857 | if (autoCommit) |
| 858 | throw newSQLException(SQLState.NO_AUTO_COMMIT_ON); |
| 859 | } |
| 860 | |
| 861 | if (this.autoCommit != autoCommit) |
| 862 | commit(); |
| 863 | |
| 864 | this.autoCommit = autoCommit; |
| 865 | } |
| 866 | |
| 867 | /** |
| 868 | * Get the current auto-commit state. |
| 869 | * |
| 870 | * @return Current state of auto-commit mode. |
| 871 | * @see #setAutoCommit |
| 872 | */ |
| 873 | public boolean getAutoCommit() throws SQLException { |
| 874 | checkIfClosed(); |
| 875 | return autoCommit; |
| 876 | } |
| 877 | |
| 878 | /** |
| 879 | * Commit makes all changes made since the previous |
| 880 | * commit/rollback permanent and releases any database locks |
| 881 | * currently held by the Connection. This method should only be |
| 882 | * used when auto commit has been disabled. |
| 883 | * |
| 884 | * @exception SQLException if a database-access error occurs. |
| 885 | * @see #setAutoCommit |
| 886 | */ |
| 887 | public void commit() throws SQLException { |
| 888 | synchronized (getConnectionSynchronization()) |
| 889 | { |
| 890 | /* |
| 891 | ** Note that the context stack is |
| 892 | ** needed even for rollback & commit |
| 893 | */ |
| 894 | setupContextStack(); |
| 895 | |
| 896 | try |
| 897 | { |
| 898 | getTR().commit(); |
| 899 | } |
| 900 | catch (Throwable t) |
| 901 | { |
| 902 | throw handleException(t); |
| 903 | } |
| 904 | finally |
| 905 | { |
| 906 | restoreContextStack(); |
| 907 | } |
| 908 | |
| 909 | needCommit = false; |
| 910 | } |
| 911 | } |
| 912 | |
| 913 | /** |
| 914 | * Rollback drops all changes made since the previous |
| 915 | * commit/rollback and releases any database locks currently held |
| 916 | * by the Connection. This method should only be used when auto |
| 917 | * commit has been disabled. |
| 918 | * |
| 919 | * @exception SQLException if a database-access error occurs. |
| 920 | * @see #setAutoCommit |
| 921 | */ |
| 922 | public void rollback() throws SQLException { |
| 923 | |
| 924 | synchronized (getConnectionSynchronization()) |
| 925 | { |
| 926 | /* |
| 927 | ** Note that the context stack is |
| 928 | ** needed even for rollback & commit |
| 929 | */ |
| 930 | setupContextStack(); |
| 931 | try |
| 932 | { |
| 933 | getTR().rollback(); |
| 934 | } catch (Throwable t) { |
| 935 | throw handleException(t); |
| 936 | } |
| 937 | finally |
| 938 | { |
| 939 | restoreContextStack(); |
| 940 | } |
| 941 | needCommit = false; |
| 942 | } |
| 943 | } |
| 944 | |
| 945 | /** |
| 946 | * In some cases, it is desirable to immediately release a |
| 947 | * Connection's database and JDBC resources instead of waiting for |
| 948 | * them to be automatically released; the close method provides this |
| 949 | * immediate release. |
| 950 | * |
| 951 | * <P><B>Note:</B> A Connection is automatically closed when it is |
| 952 | * garbage collected. Certain fatal errors also result in a closed |
| 953 | * Connection. |
| 954 | * |
| 955 | * @exception SQLException if a database-access error occurs. |
| 956 | */ |
| 957 | public void close() throws SQLException { |
| 958 | // JDK 1.4 javadoc indicates close on a closed connection is a no-op |
| 959 | if (isClosed()) |
| 960 | return; |
| 961 | |
| 962 | |
| 963 | if (rootConnection == this) |
| 964 | { |
| 965 | /* Throw error to match DB2/JDBC if a tran is pending in non-autocommit mode */ |
| 966 | if (!autoCommit && !transactionIsIdle()) { |
| 967 | throw newSQLException(SQLState.LANG_INVALID_TRANSACTION_STATE); |
| 968 | } |
| 969 | |
| 970 | close(exceptionClose); |
| 971 | } |
| 972 | else |
| 973 | setInactive(); // nested connection |
| 974 | } |
| 975 | |
| 976 | // This inner close takes the exception and calls |
| 977 | // the context manager to make the connection close. |
| 978 | // The exception must be a session severity exception. |
| 979 | // |
| 980 | // NOTE: This method is not part of JDBC specs. |
| 981 | // |
| 982 | private void close(StandardException e) throws SQLException { |
| 983 | |
| 984 | synchronized(getConnectionSynchronization()) |
| 985 | { |
| 986 | if (rootConnection == this) |
| 987 | { |
| 988 | /* |
| 989 | * If it isn't active, it's already been closed. |
| 990 | */ |
| 991 | if (active) { |
| 992 | setupContextStack(); |
| 993 | try { |
| 994 | tr.rollback(); |
| 995 | |
| 996 | // Let go of lcc reference so it can be GC'ed after |
| 997 | // cleanupOnError, the tr will stay around until the |
| 998 | // rootConnection itself is GC'ed, which is dependent |
| 999 | // on how long the client program wants to hold on to |
| 1000 | // the Connection object. |
| 1001 | tr.clearLcc(); |
| 1002 | tr.cleanupOnError(e); |
| 1003 | |
| 1004 | } catch (Throwable t) { |
| 1005 | throw handleException(t); |
| 1006 | } finally { |
| 1007 | restoreContextStack(); |
| 1008 | } |
| 1009 | } |
| 1010 | } |
| 1011 | |
| 1012 | if (!isClosed()) |
| 1013 | setInactive(); |
| 1014 | } |
| 1015 | } |
| 1016 | |
| 1017 | /** |
| 1018 | * Tests to see if a Connection is closed. |
| 1019 | * |
| 1020 | * @return true if the connection is closed; false if it's still open |
| 1021 | */ |
| 1022 | public final boolean isClosed() { |
| 1023 | if (active) { |
| 1024 | |
| 1025 | // I am attached, check the database state |
| 1026 | if (getTR().isActive()) { |
| 1027 | return false; |
| 1028 | } |
| 1029 | |
| 1030 | setInactive(); |
| 1031 | |
| 1032 | } |
| 1033 | return true; |
| 1034 | } |
| 1035 | |
| 1036 | /** |
| 1037 | * A Connection's database is able to provide information |
| 1038 | * describing its tables, its supported SQL grammar, its stored |
| 1039 | * procedures, the capabilities of this connection, etc. This |
| 1040 | * information is made available through a DatabaseMetaData |
| 1041 | * object. |
| 1042 | * |
| 1043 | * @return a DatabaseMetaData object for this Connection |
| 1044 | * @exception SQLException if a database-access error occurs. |
| 1045 | */ |
| 1046 | public DatabaseMetaData getMetaData() throws SQLException { |
| 1047 | checkIfClosed(); |
| 1048 | |
| 1049 | if (dbMetadata == null) { |
| 1050 | |
| 1051 | // There is a case where dbname can be null. |
| 1052 | // Replication client of this method does not have a |
| 1053 | // JDBC connection; therefore dbname is null and this |
| 1054 | // is expected. |
| 1055 | // |
| 1056 | dbMetadata = factory.newEmbedDatabaseMetaData(this, getTR().getUrl()); |
| 1057 | } |
| 1058 | return dbMetadata; |
| 1059 | } |
| 1060 | |
| 1061 | /** |
| 1062 | JDBC 3.0 |
| 1063 | * Retrieves the current holdability of ResultSet objects created using this |
| 1064 | * Connection object. |
| 1065 | * |
| 1066 | * |
| 1067 | * @return The holdability, one of ResultSet.HOLD_CURSORS_OVER_COMMIT |
| 1068 | * or ResultSet.CLOSE_CURSORS_AT_COMMIT |
| 1069 | * |
| 1070 | */ |
| 1071 | public final int getHoldability() throws SQLException { |
| 1072 | checkIfClosed(); |
| 1073 | return connectionHoldAbility; |
| 1074 | } |
| 1075 | |
| 1076 | /** |
| 1077 | JDBC 3.0 |
| 1078 | * Changes the holdability of ResultSet objects created using this |
| 1079 | * Connection object to the given holdability. |
| 1080 | * |
| 1081 | * |
| 1082 | * @param holdability A ResultSet holdability constant, one of ResultSet.HOLD_CURSORS_OVER_COMMIT |
| 1083 | * or ResultSet.CLOSE_CURSORS_AT_COMMIT |
| 1084 | * |
| 1085 | */ |
| 1086 | public final void setHoldability(int holdability) throws SQLException { |
| 1087 | checkIfClosed(); |
| 1088 | connectionHoldAbility = holdability; |
| 1089 | } |
| 1090 | |
| 1091 | /** |
| 1092 | * You can put a connection in read-only mode as a hint to enable |
| 1093 | * database optimizations. |
| 1094 | * |
| 1095 | * <P><B>Note:</B> setReadOnly cannot be called while in the |
| 1096 | * middle of a transaction. |
| 1097 | * |
| 1098 | * @param readOnly true enables read-only mode; false disables |
| 1099 | * read-only mode. |
| 1100 | * @exception SQLException if a database-access error occurs. |
| 1101 | */ |
| 1102 | public final void setReadOnly(boolean readOnly) throws SQLException |
| 1103 | { |
| 1104 | synchronized(getConnectionSynchronization()) |
| 1105 | { |
| 1106 | setupContextStack(); |
| 1107 | try { |
| 1108 | getLanguageConnection().setReadOnly(readOnly); |
| 1109 | } catch (StandardException e) { |
| 1110 | throw handleException(e); |
| 1111 | } finally { |
| 1112 | restoreContextStack(); |
| 1113 | } |
| 1114 | } |
| 1115 | } |
| 1116 | |
| 1117 | /** |
| 1118 | * Tests to see if the connection is in read-only mode. |
| 1119 | * |
| 1120 | * @return true if connection is read-only |
| 1121 | * @exception SQLException if a database-access error occurs. |
| 1122 | */ |
| 1123 | public final boolean isReadOnly() throws SQLException |
| 1124 | { |
| 1125 | checkIfClosed(); |
| 1126 | return getLanguageConnection().isReadOnly(); |
| 1127 | } |
| 1128 | |
| 1129 | /** |
| 1130 | * A sub-space of this Connection's database may be selected by setting a |
| 1131 | * catalog name. If the driver does not support catalogs it will |
| 1132 | * silently ignore this request. |
| 1133 | * |
| 1134 | * @exception SQLException if a database-access error occurs. |
| 1135 | */ |
| 1136 | public void setCatalog(String catalog) throws SQLException { |
| 1137 | checkIfClosed(); |
| 1138 | // silently ignoring this request like the javadoc said. |
| 1139 | return; |
| 1140 | } |
| 1141 | |
| 1142 | /** |
| 1143 | * Return the Connection's current catalog name. |
| 1144 | * |
| 1145 | * @return the current catalog name or null |
| 1146 | * @exception SQLException if a database-access error occurs. |
| 1147 | */ |
| 1148 | public String getCatalog() throws SQLException { |
| 1149 | checkIfClosed(); |
| 1150 | // we do not have support for Catalog, just return null as |
| 1151 | // the JDBC specs mentions then. |
| 1152 | return null; |
| 1153 | } |
| 1154 | |
| 1155 | /** |
| 1156 | * You can call this method to try to change the transaction |
| 1157 | * isolation level using one of the TRANSACTION_* values. |
| 1158 | * |
| 1159 | * <P><B>Note:</B> setTransactionIsolation causes the current |
| 1160 | * transaction to commit |
| 1161 | * |
| 1162 | * @param level one of the TRANSACTION_* isolation values with the |
| 1163 | * exception of TRANSACTION_NONE; some databases may not support |
| 1164 | * other values |
| 1165 | * @exception SQLException if a database-access error occurs. |
| 1166 | * @see DatabaseMetaData#supportsTransactionIsolationLevel |
| 1167 | */ |
| 1168 | public void setTransactionIsolation(int level) throws SQLException { |
| 1169 | |
| 1170 | if (level == getTransactionIsolation()) |
| 1171 | return; |
| 1172 | |
| 1173 | // Convert the isolation level to the internal one |
| 1174 | int iLevel; |
| 1175 | switch (level) |
| 1176 | { |
| 1177 | case java.sql.Connection.TRANSACTION_READ_UNCOMMITTED: |
| 1178 | iLevel = ExecutionContext.READ_UNCOMMITTED_ISOLATION_LEVEL; |
| 1179 | break; |
| 1180 | |
| 1181 | case java.sql.Connection.TRANSACTION_READ_COMMITTED: |
| 1182 | iLevel = ExecutionContext.READ_COMMITTED_ISOLATION_LEVEL; |
| 1183 | break; |
| 1184 | |
| 1185 | case java.sql.Connection.TRANSACTION_REPEATABLE_READ: |
| 1186 | iLevel = ExecutionContext.REPEATABLE_READ_ISOLATION_LEVEL; |
| 1187 | break; |
| 1188 | |
| 1189 | case java.sql.Connection.TRANSACTION_SERIALIZABLE: |
| 1190 | iLevel = ExecutionContext.SERIALIZABLE_ISOLATION_LEVEL; |
| 1191 | break; |
| 1192 | default: |
| 1193 | throw newSQLException(SQLState.UNIMPLEMENTED_ISOLATION_LEVEL, new Integer(level)); |
| 1194 | } |
| 1195 | |
| 1196 | synchronized(getConnectionSynchronization()) |
| 1197 | { |
| 1198 | setupContextStack(); |
| 1199 | try { |
| 1200 | getLanguageConnection().setIsolationLevel(iLevel); |
| 1201 | } catch (StandardException e) { |
| 1202 | throw handleException(e); |
| 1203 | } finally { |
| 1204 | restoreContextStack(); |
| 1205 | } |
| 1206 | } |
| 1207 | } |
| 1208 | |
| 1209 | |
| 1210 | /** |
| 1211 | * Get this Connection's current transaction isolation mode. |
| 1212 | * |
| 1213 | * @return the current TRANSACTION_* mode value |
| 1214 | * @exception SQLException if a database-access error occurs. |
| 1215 | */ |
| 1216 | public final int getTransactionIsolation() throws SQLException { |
| 1217 | checkIfClosed(); |
| 1218 | return ExecutionContext.CS_TO_JDBC_ISOLATION_LEVEL_MAP[getLanguageConnection().getCurrentIsolationLevel()]; |
| 1219 | } |
| 1220 | |
| 1221 | /** |
| 1222 | * The first warning reported by calls on this Connection is |
| 1223 | * returned. |
| 1224 | * |
| 1225 | * <P><B>Note:</B> Subsequent warnings will be chained to this |
| 1226 | * SQLWarning. |
| 1227 | * |
| 1228 | * @return the first SQLWarning or null |
| 1229 | * |
| 1230 | * Synchronization note: Warnings are synchronized |
| 1231 | * on nesting level |
| 1232 | */ |
| 1233 | public final synchronized SQLWarning getWarnings() throws SQLException { |
| 1234 | checkIfClosed(); |
| 1235 | return topWarning; |
| 1236 | } |
| 1237 | |
| 1238 | /** |
| 1239 | * After this call, getWarnings returns null until a new warning is |
| 1240 | * reported for this Connection. |
| 1241 | * |
| 1242 | * Synchronization node: Warnings are synchonized |
| 1243 | * on nesting level |
| 1244 | */ |
| 1245 | public final synchronized void clearWarnings() throws SQLException { |
| 1246 | checkIfClosed(); |
| 1247 | topWarning = null; |
| 1248 | } |
| 1249 | |
| 1250 | ///////////////////////////////////////////////////////////////////////// |
| 1251 | // |
| 1252 | // JDBC 2.0 - New public methods |
| 1253 | // |
| 1254 | ///////////////////////////////////////////////////////////////////////// |
| 1255 | |
| 1256 | /** |
| 1257 | * |
| 1258 | * Get the type-map object associated with this connection. |
| 1259 | * By default, the map returned is empty. |
| 1260 | * JDBC 2.0 - java.util.Map requires JDK 1 |
| 1261 | * |
| 1262 | */ |
| 1263 | public java.util.Map getTypeMap() throws SQLException { |
| 1264 | checkIfClosed(); |
| 1265 | // just return an immuntable empty map |
| 1266 | return java.util.Collections.EMPTY_MAP; |
| 1267 | } |
| 1268 | |
| 1269 | /** |
| 1270 | * Install a type-map object as the default type-map for |
| 1271 | * this connection. |
| 1272 | * JDBC 2.0 - java.util.Map requires JDK 1 |
| 1273 | * |
| 1274 | * @exception SQLException Feature not implemented for now. |
| 1275 | */ |
| 1276 | public final void setTypeMap(java.util.Map map) throws SQLException { |
| 1277 | checkIfClosed(); |
| 1278 | if( map == null) |
| 1279 | throw Util.generateCsSQLException(SQLState.INVALID_API_PARAMETER,map,"map", |
| 1280 | "java.sql.Connection.setTypeMap"); |
| 1281 | if(!(map.isEmpty())) |
| 1282 | throw Util.notImplemented(); |
| 1283 | } |
| 1284 | |
| 1285 | ///////////////////////////////////////////////////////////////////////// |
| 1286 | // |
| 1287 | // Implementation specific methods |
| 1288 | // |
| 1289 | ///////////////////////////////////////////////////////////////////////// |
| 1290 | |
| 1291 | /** |
| 1292 | Add a warning to the current list of warnings, to follow |
| 1293 | this note from Connection.getWarnings. |
| 1294 | Note: Subsequent warnings will be chained to this SQLWarning. |
| 1295 | |
| 1296 | @see java.sql.Connection#getWarnings |
| 1297 | */ |
| 1298 | public final synchronized void addWarning(SQLWarning newWarning) { |
| 1299 | if (topWarning == null) { |
| 1300 | topWarning = newWarning; |
| 1301 | return; |
| 1302 | } |
| 1303 | |
| 1304 | topWarning.setNextWarning(newWarning); |
| 1305 | } |
| 1306 | |
| 1307 | /** |
| 1308 | * Return the dbname for this connection. |
| 1309 | * |
| 1310 | * @return String The dbname for this connection. |
| 1311 | */ |
| 1312 | public String getDBName() |
| 1313 | { |
| 1314 | if (SanityManager.DEBUG) |
| 1315 | SanityManager.ASSERT(!isClosed(), "connection is closed"); |
| 1316 | |
| 1317 | return getTR().getDBName(); |
| 1318 | } |
| 1319 | |
| 1320 | public final LanguageConnectionContext getLanguageConnection() { |
| 1321 | |
| 1322 | if (SanityManager.DEBUG) |
| 1323 | SanityManager.ASSERT(!isClosed(), "connection is closed"); |
| 1324 | |
| 1325 | return getTR().getLcc(); |
| 1326 | } |
| 1327 | |
| 1328 | /** |
| 1329 | * Raises an exception if the connection is closed. |
| 1330 | * |
| 1331 | * @exception SQLException if the connection is closed |
| 1332 | */ |
| 1333 | protected final void checkIfClosed() throws SQLException { |
| 1334 | if (isClosed()) { |
| 1335 | throw Util.noCurrentConnection(); |
| 1336 | } |
| 1337 | } |
| 1338 | |
| 1339 | //EmbedConnection30 overrides this method so it can release the savepoints array if |
| 1340 | //the exception severity is transaction level |
| 1341 | SQLException handleException(Throwable thrownException) |
| 1342 | throws SQLException |
| 1343 | { |
| 1344 | /* |
| 1345 | ** By default, rollback the connection on if autocommit |
| 1346 | ** is on. |
| 1347 | */ |
| 1348 | return getTR().handleException(thrownException, |
| 1349 | autoCommit, |
| 1350 | true // Rollback xact on auto commit |
| 1351 | ); |
| 1352 | } |
| 1353 | |
| 1354 | /** |
| 1355 | Handle any type of Exception. |
| 1356 | <UL> |
| 1357 | <LI> Inform the contexts of the error |
| 1358 | <LI> Throw an Util based upon the thrown exception. |
| 1359 | </UL> |
| 1360 | |
| 1361 | REMIND: now that we know all the exceptions from our driver |
| 1362 | are Utils, would it make sense to shut down the system |
| 1363 | for unknown SQLExceptions? At present, we do not. |
| 1364 | |
| 1365 | Because this is the last stop for exceptions, |
| 1366 | it will catch anything that occurs in it and try |
| 1367 | to cleanup before re-throwing them. |
| 1368 | |
| 1369 | @param thrownException the exception |
| 1370 | @param rollbackOnAutoCommit rollback the xact on if autocommit is |
| 1371 | on, otherwise rollback stmt but leave xact open (and |
| 1372 | continue to hold on to locks). Most of the time, this |
| 1373 | will be true, excepting operations on result sets, like |
| 1374 | getInt(). |
| 1375 | */ |
| 1376 | final SQLException handleException(Throwable thrownException, |
| 1377 | boolean rollbackOnAutoCommit) |
| 1378 | throws SQLException |
| 1379 | { |
| 1380 | return getTR().handleException(thrownException, autoCommit, |
| 1381 | rollbackOnAutoCommit); |
| 1382 | |
| 1383 | } |
| 1384 | |
| 1385 | /* |
| 1386 | This is called from the EmbedConnectionContext to |
| 1387 | close on errors. We assume all handling of the connectin |
| 1388 | is dealt with via the context stack, and our only role |
| 1389 | is to mark ourself as closed. |
| 1390 | */ |
| 1391 | |
| 1392 | /** |
| 1393 | Close the connection when processing errors, or when |
| 1394 | closing a nested connection. |
| 1395 | <p> |
| 1396 | This only marks it as closed and frees up its resources; |
| 1397 | any closing of the underlying connection or commit work |
| 1398 | is assumed to be done elsewhere. |
| 1399 | |
| 1400 | Called from EmbedConnectionContext's cleanup routine, |
| 1401 | and by proxy.close(). |
| 1402 | */ |
| 1403 | |
| 1404 | public final void setInactive() { |
| 1405 | |
| 1406 | if (active == false) |
| 1407 | return; |
| 1408 | // active = false |
| 1409 | // tr = null !-> active = false |
| 1410 | |
| 1411 | synchronized (getConnectionSynchronization()) { |
| 1412 | active = false; |
| 1413 | // tr = null; cleanupOnerror sets inactive but still needs tr to |
| 1414 | // restore context later |
| 1415 | dbMetadata = null; |
| 1416 | } |
| 1417 | } |
| 1418 | |
| 1419 | /** |
| 1420 | @exception Throwable standard error policy |
| 1421 | */ |
| 1422 | protected void finalize() throws Throwable |
| 1423 | { |
| 1424 | if (rootConnection == this) |
| 1425 | { |
| 1426 | super.finalize(); |
| 1427 | if (!isClosed()) |
| 1428 | close(exceptionClose); |
| 1429 | } |
| 1430 | } |
| 1431 | |
| 1432 | /** |
| 1433 | * if auto commit is on, remember that we need to commit |
| 1434 | * the current statement. |
| 1435 | */ |
| 1436 | protected void needCommit() { |
| 1437 | if (!needCommit) needCommit = true; |
| 1438 | } |
| 1439 | |
| 1440 | /** |
| 1441 | * if a commit is needed, perform it. |
| 1442 | * |
| 1443 | * Must have connection synchonization and context set up already. |
| 1444 | * |
| 1445 | * @exception SQLException if commit returns error |
| 1446 | */ |
| 1447 | protected void commitIfNeeded() throws SQLException |
| 1448 | { |
| 1449 | if (autoCommit && needCommit) |
| 1450 | { |
| 1451 | try |
| 1452 | { |
| 1453 | getTR().commit(); |
| 1454 | } |
| 1455 | catch (Throwable t) |
| 1456 | { |
| 1457 | throw handleException(t); |
| 1458 | } |
| 1459 | needCommit = false; |
| 1460 | } |
| 1461 | } |
| 1462 | |
| 1463 | /** |
| 1464 | * If in autocommit, then commit. |
| 1465 | * |
| 1466 | * Used to force a commit after a result set closes in autocommit mode. |
| 1467 | * The needCommit mechanism does not work correctly as there are times |
| 1468 | * with cursors (like a commit, followed by a next, followed by a close) |
| 1469 | * where the system does not think it needs a commit but we need to |
| 1470 | * force the commit on close. It seemed safer to just force a commit |
| 1471 | * on close rather than count on keeping the needCommit flag correct for |
| 1472 | * all cursor cases. |
| 1473 | * |
| 1474 | * Must have connection synchonization and context set up already. |
| 1475 | * |
| 1476 | * @exception SQLException if commit returns error |
| 1477 | */ |
| 1478 | protected void commitIfAutoCommit() throws SQLException |
| 1479 | { |
| 1480 | if (autoCommit) |
| 1481 | { |
| 1482 | try |
| 1483 | { |
| 1484 | getTR().commit(); |
| 1485 | } |
| 1486 | catch (Throwable t) |
| 1487 | { |
| 1488 | throw handleException(t); |
| 1489 | } |
| 1490 | needCommit = false; |
| 1491 | } |
| 1492 | } |
| 1493 | |
| 1494 | |
| 1495 | final protected Object getConnectionSynchronization() |
| 1496 | { |
| 1497 | return rootConnection; |
| 1498 | } |
| 1499 | |
| 1500 | /** |
| 1501 | Install the context manager for this thread. Check connection status here. |
| 1502 | @exception SQLException if fails |
| 1503 | */ |
| 1504 | protected final void setupContextStack() throws SQLException { |
| 1505 | |
| 1506 | /* |
| 1507 | Track this entry, then throw an exception |
| 1508 | rather than doing the quiet return. Need the |
| 1509 | track before the throw because the backtrack |
| 1510 | is in a finally block. |
| 1511 | */ |
| 1512 | |
| 1513 | checkIfClosed(); |
| 1514 | |
| 1515 | getTR().setupContextStack(); |
| 1516 | |
| 1517 | } |
| 1518 | |
| 1519 | protected final void restoreContextStack() throws SQLException { |
| 1520 | |
| 1521 | if (SanityManager.DEBUG) |
| 1522 | Util.ASSERT(this, (active) || getTR().getCsf() !=null, "No context service to do restore"); |
| 1523 | |
| 1524 | TransactionResourceImpl tr = getTR(); |
| 1525 | |
| 1526 | //REMIND: someone is leaving an incorrect manager on when they |
| 1527 | // are exiting the system in the nested case. |
| 1528 | if (SanityManager.DEBUG) |
| 1529 | { |
| 1530 | if ((tr.getCsf() != null) && (tr.getCsf().getCurrentContextManager() != |
| 1531 | tr.getContextManager())) |
| 1532 | { |
| 1533 | Util.THROWASSERT(this, |
| 1534 | "Current Context Manager not the one was expected: " + |
| 1535 | tr.getCsf().getCurrentContextManager() + " " + |
| 1536 | tr.getContextManager()); |
| 1537 | } |
| 1538 | } |
| 1539 | |
| 1540 | tr.restoreContextStack(); |
| 1541 | } |
| 1542 | |
| 1543 | /* |
| 1544 | ** Create database methods. |
| 1545 | */ |
| 1546 | |
| 1547 | /** |
| 1548 | Create a new database. |
| 1549 | @param dbname the database name |
| 1550 | @param info the properties |
| 1551 | |
| 1552 | @return Database The newly created database or null. |
| 1553 | |
| 1554 | @exception SQLException if fails to create database |
| 1555 | */ |
| 1556 | |
| 1557 | private Database createDatabase(String dbname, Properties info) |
| 1558 | throws SQLException { |
| 1559 | |
| 1560 | info = filterProperties(info); |
| 1561 | |
| 1562 | try { |
| 1563 | if (Monitor.createPersistentService(Property.DATABASE_MODULE, dbname, info) == null) |
| 1564 | { |
| 1565 | // service already exists, create a warning |
| 1566 | addWarning(EmbedSQLWarning.newEmbedSQLWarning(SQLState.DATABASE_EXISTS, dbname)); |
| 1567 | } |
| 1568 | } catch (StandardException mse) { |
| 1569 | |
| 1570 | SQLException se = newSQLException(SQLState.CREATE_DATABASE_FAILED, dbname); |
| 1571 | se.setNextException(handleException(mse)); |
| 1572 | throw se; |
| 1573 | } |
| 1574 | |
| 1575 | // clear these values as some modules hang onto |
| 1576 | // the properties set corresponding to service.properties |
| 1577 | // and they shouldn't be interested in these JDBC attributes. |
| 1578 | info.clear(); |
| 1579 | |
| 1580 | return (Database) Monitor.findService(Property.DATABASE_MODULE, dbname); |
| 1581 | } |
| 1582 | |
| 1583 | |
| 1584 | /** |
| 1585 | Return false iff the monitor cannot handle a service |
| 1586 | of the type indicated by the protocol within the name. |
| 1587 | If that's the case then we are the wrong driver. |
| 1588 | |
| 1589 | Throw exception if anything else is wrong. |
| 1590 | */ |
| 1591 | |
| 1592 | private boolean bootDatabase(Properties info) throws Throwable |
| 1593 | { |
| 1594 | String dbname = tr.getDBName(); |
| 1595 | |
| 1596 | // boot database now |
| 1597 | try { |
| 1598 | |
| 1599 | info = filterProperties(info); |
| 1600 | |
| 1601 | // try to start the service if it doesn't already exist |
| 1602 | if (!Monitor.startPersistentService(dbname, info)) { |
| 1603 | // a false indicates the monitor cannot handle a service |
| 1604 | // of the type indicated by the protocol within the name. |
| 1605 | // If that's the case then we are the wrong driver |
| 1606 | // so just return null. |
| 1607 | return false; |
| 1608 | } |
| 1609 | |
| 1610 | // clear these values as some modules hang onto |
| 1611 | // the properties set corresponding to service.properties |
| 1612 | // and they shouldn't be interested in these JDBC attributes. |
| 1613 | info.clear(); |
| 1614 | |
| 1615 | Database database = (Database) Monitor.findService(Property.DATABASE_MODULE, dbname); |
| 1616 | tr.setDatabase(database); |
| 1617 | |
| 1618 | } catch (StandardException mse) { |
| 1619 | SQLException se = newSQLException(SQLState.BOOT_DATABASE_FAILED, dbname); |
| 1620 | |
| 1621 | Throwable ne = mse.getNestedException(); |
| 1622 | SQLException nse; |
| 1623 | |
| 1624 | /* |
| 1625 | If there is a next exception, assume |
| 1626 | that the first one is just a redundant "see the |
| 1627 | next exception" message. |
| 1628 | if it is a BEI, treat it as a database exception. |
| 1629 | If there isn't a BEI, treat it as a java exception. |
| 1630 | |
| 1631 | In general we probably want to walk the chain |
| 1632 | and return all of them, but empirically, this |
| 1633 | is all we need to do for now. |
| 1634 | */ |
| 1635 | if (ne instanceof StandardException) |
| 1636 | nse = Util.generateCsSQLException((StandardException)ne); |
| 1637 | else if (ne != null) |
| 1638 | nse = Util.javaException(ne); |
| 1639 | else |
| 1640 | nse = Util.generateCsSQLException(mse); |
| 1641 | |
| 1642 | se.setNextException(nse); |
| 1643 | throw se; |
| 1644 | } |
| 1645 | |
| 1646 | // If database exists, getDatabase() will return the database object. |
| 1647 | // If any error occured while booting an existing database, an |
| 1648 | // exception would have been thrown already. |
| 1649 | return true; |
| 1650 | |
| 1651 | } |
| 1652 | |
| 1653 | /* |
| 1654 | * Class interface methods used by database metadata to ensure |
| 1655 | * good relations with autocommit. |
| 1656 | */ |
| 1657 | |
| 1658 | PreparedStatement prepareMetaDataStatement(String sql) |
| 1659 | throws SQLException { |
| 1660 | synchronized (getConnectionSynchronization()) { |
| 1661 | setupContextStack(); |
| 1662 | PreparedStatement s = null; |
| 1663 | try { |
| 1664 | s = factory.newEmbedPreparedStatement(this, sql, true, |
| 1665 | JDBC20Translation.TYPE_FORWARD_ONLY, |
| 1666 | JDBC20Translation.CONCUR_READ_ONLY, |
| 1667 | connectionHoldAbility, |
| 1668 | JDBC30Translation.NO_GENERATED_KEYS, |
| 1669 | null, |
| 1670 | null); |
| 1671 | } finally { |
| 1672 | restoreContextStack(); |
| 1673 | } |
| 1674 | return s; |
| 1675 | } |
| 1676 | } |
| 1677 | |
| 1678 | public final InternalDriver getLocalDriver() |
| 1679 | { |
| 1680 | if (SanityManager.DEBUG) |
| 1681 | SanityManager.ASSERT(!isClosed(), "connection is closed"); |
| 1682 | |
| 1683 | return getTR().getDriver(); |
| 1684 | } |
| 1685 | |
| 1686 | /** |
| 1687 | Return the context manager for this connection. |
| 1688 | */ |
| 1689 | public final ContextManager getContextManager() { |
| 1690 | |
| 1691 | if (SanityManager.DEBUG) |
| 1692 | SanityManager.ASSERT(!isClosed(), "connection is closed"); |
| 1693 | |
| 1694 | return getTR().getContextManager(); |
| 1695 | } |
| 1696 | |
| 1697 | /** |
| 1698 | * Filter out properties from the passed in set of JDBC attributes |
| 1699 | * to remove any derby.* properties. This is to ensure that setting |
| 1700 | * derby.* properties does not work this way, it's not a defined way |
| 1701 | * to set such properties and could be a secuirty hole in allowing |
| 1702 | * remote connections to override system, application or database settings. |
| 1703 | * |
| 1704 | * @return a new Properties set copied from the parameter but with no |
| 1705 | * derby.* properties. |
| 1706 | */ |
| 1707 | private Properties filterProperties(Properties inputSet) { |
| 1708 | Properties limited = new Properties(); |
| 1709 | |
| 1710 | // filter out any derby.* properties, only |
| 1711 | // JDBC attributes can be set this way |
| 1712 | for (java.util.Enumeration e = inputSet.propertyNames(); e.hasMoreElements(); ) { |
| 1713 | |
| 1714 | String key = (String) e.nextElement(); |
| 1715 | |
| 1716 | // we don't allow properties to be set this way |
| 1717 | if (key.startsWith("derby.")) |
| 1718 | continue; |
| 1719 | limited.put(key, inputSet.getProperty(key)); |
| 1720 | } |
| 1721 | return limited; |
| 1722 | } |
| 1723 | |
| 1724 | /* |
| 1725 | ** methods to be overridden by subimplementations wishing to insert |
| 1726 | ** their classes into the mix. |
| 1727 | */ |
| 1728 | |
| 1729 | protected Database getDatabase() |
| 1730 | { |
| 1731 | if (SanityManager.DEBUG) |
| 1732 | SanityManager.ASSERT(!isClosed(), "connection is closed"); |
| 1733 | |
| 1734 | return getTR().getDatabase(); |
| 1735 | } |
| 1736 | |
| 1737 | final protected TransactionResourceImpl getTR() |
| 1738 | { |
| 1739 | return rootConnection.tr; |
| 1740 | } |
| 1741 | |
| 1742 | private EmbedConnectionContext pushConnectionContext(ContextManager cm) { |
| 1743 | return new EmbedConnectionContext(cm, this); |
| 1744 | } |
| 1745 | |
| 1746 | public final void setApplicationConnection(java.sql.Connection applicationConnection) { |
| 1747 | this.applicationConnection = applicationConnection; |
| 1748 | } |
| 1749 | |
| 1750 | public final java.sql.Connection getApplicationConnection() { |
| 1751 | return applicationConnection; |
| 1752 | } |
| 1753 | |
| 1754 | public void setDrdaID(String drdaID) { |
| 1755 | getLanguageConnection().setDrdaID(drdaID); |
| 1756 | } |
| 1757 | |
| 1758 | /** |
| 1759 | Reset the connection before it is returned from a PooledConnection |
| 1760 | to a new application request (wrapped by a BrokeredConnection). |
| 1761 | Examples of reset covered here is dropping session temporary tables |
| 1762 | and reseting IDENTITY_VAL_LOCAL. |
| 1763 | Most JDBC level reset is handled by calling standard java.sql.Connection |
| 1764 | methods from EmbedPooledConnection. |
| 1765 | */ |
| 1766 | public void resetFromPool() throws SQLException { |
| 1767 | synchronized (getConnectionSynchronization()) |
| 1768 | { |
| 1769 | setupContextStack(); |
| 1770 | try { |
| 1771 | getLanguageConnection().resetFromPool(); |
| 1772 | } catch (StandardException t) { |
| 1773 | throw handleException(t); |
| 1774 | } |
| 1775 | finally |
| 1776 | { |
| 1777 | restoreContextStack(); |
| 1778 | } |
| 1779 | } |
| 1780 | } |
| 1781 | |
| 1782 | /* |
| 1783 | ** methods to be overridden by subimplementations wishing to insert |
| 1784 | ** their classes into the mix. |
| 1785 | ** The reason we need to override them is because we want to create a |
| 1786 | ** Local20/LocalStatment object (etc) rather than a Local/LocalStatment |
| 1787 | ** object (etc). |
| 1788 | */ |
| 1789 | |
| 1790 | |
| 1791 | /* |
| 1792 | ** XA support |
| 1793 | */ |
| 1794 | |
| 1795 | public final int xa_prepare() throws SQLException { |
| 1796 | |
| 1797 | synchronized (getConnectionSynchronization()) |
| 1798 | { |
| 1799 | setupContextStack(); |
| 1800 | try |
| 1801 | { |
| 1802 | XATransactionController tc = |
| 1803 | (XATransactionController) getLanguageConnection().getTransactionExecute(); |
| 1804 | |
| 1805 | int ret = tc.xa_prepare(); |
| 1806 | |
| 1807 | if (ret == XATransactionController.XA_RDONLY) |
| 1808 | { |
| 1809 | // On a prepare call, xa allows an optimization that if the |
| 1810 | // transaction is read only, the RM can just go ahead and |
| 1811 | // commit it. So if store returns this read only status - |
| 1812 | // meaning store has taken the liberty to commit already - we |
| 1813 | // needs to turn around and call internalCommit (without |
| 1814 | // committing the store again) to make sure the state is |
| 1815 | // consistent. Since the transaction is read only, there is |
| 1816 | // probably not much that needs to be done. |
| 1817 | |
| 1818 | getLanguageConnection().internalCommit(false /* don't commitStore again */); |
| 1819 | } |
| 1820 | return ret; |
| 1821 | } catch (StandardException t) |
| 1822 | { |
| 1823 | throw handleException(t); |
| 1824 | } |
| 1825 | finally |
| 1826 | { |
| 1827 | restoreContextStack(); |
| 1828 | } |
| 1829 | } |
| 1830 | } |
| 1831 | |
| 1832 | |
| 1833 | public final void xa_commit(boolean onePhase) throws SQLException { |
| 1834 | |
| 1835 | synchronized (getConnectionSynchronization()) |
| 1836 | { |
| 1837 | setupContextStack(); |
| 1838 | try |
| 1839 | { |
| 1840 | getLanguageConnection().xaCommit(onePhase); |
| 1841 | } catch (StandardException t) |
| 1842 | { |
| 1843 | throw handleException(t); |
| 1844 | } |
| 1845 | finally |
| 1846 | { |
| 1847 | restoreContextStack(); |
| 1848 | } |
| 1849 | } |
| 1850 | } |
| 1851 | public final void xa_rollback() throws SQLException { |
| 1852 | |
| 1853 | synchronized (getConnectionSynchronization()) |
| 1854 | { |
| 1855 | setupContextStack(); |
| 1856 | try |
| 1857 | { |
| 1858 | getLanguageConnection().xaRollback(); |
| 1859 | } catch (StandardException t) |
| 1860 | { |
| 1861 | throw handleException(t); |
| 1862 | } |
| 1863 | finally |
| 1864 | { |
| 1865 | restoreContextStack(); |
| 1866 | } |
| 1867 | } |
| 1868 | } |
| 1869 | /** |
| 1870 | * returns false if there is an underlying transaction and that transaction |
| 1871 | * has done work. True if there is no underlying transaction or that |
| 1872 | * underlying transaction is idle |
| 1873 | */ |
| 1874 | public final boolean transactionIsIdle() |
| 1875 | { |
| 1876 | return getTR().isIdle(); |
| 1877 | } |
| 1878 | private int setResultSetType(int resultSetType) { |
| 1879 | |
| 1880 | /* Add warning if scroll sensitive cursor |
| 1881 | * and downgrade to scroll insensitive cursor. |
| 1882 | */ |
| 1883 | if (resultSetType == JDBC20Translation.TYPE_SCROLL_SENSITIVE) |
| 1884 | { |
| 1885 | addWarning(EmbedSQLWarning.newEmbedSQLWarning(SQLState.NO_SCROLL_SENSITIVE_CURSORS)); |
| 1886 | resultSetType = JDBC20Translation.TYPE_SCROLL_INSENSITIVE; |
| 1887 | } |
| 1888 | return resultSetType; |
| 1889 | } |
| 1890 | |
| 1891 | |
| 1892 | /** |
| 1893 | * Set the transaction isolation level that will be used for the |
| 1894 | * next prepare. Used by network server to implement DB2 style |
| 1895 | * isolation levels. |
| 1896 | * @param level Isolation level to change to. level is the DB2 level |
| 1897 | * specified in the package names which happen to correspond |
| 1898 | * to our internal levels. If |
| 1899 | * level == ExecutionContext.UNSPECIFIED_ISOLATION, |
| 1900 | * the statement won't be prepared with an isolation level. |
| 1901 | * |
| 1902 | * |
| 1903 | */ |
| 1904 | public void setPrepareIsolation(int level) throws SQLException |
| 1905 | { |
| 1906 | if (level == getPrepareIsolation()) |
| 1907 | return; |
| 1908 | |
| 1909 | switch (level) |
| 1910 | { |
| 1911 | case ExecutionContext.READ_UNCOMMITTED_ISOLATION_LEVEL: |
| 1912 | case ExecutionContext.REPEATABLE_READ_ISOLATION_LEVEL: |
| 1913 | case ExecutionContext.READ_COMMITTED_ISOLATION_LEVEL: |
| 1914 | case ExecutionContext.SERIALIZABLE_ISOLATION_LEVEL: |
| 1915 | case ExecutionContext.UNSPECIFIED_ISOLATION_LEVEL: |
| 1916 | break; |
| 1917 | default: |
| 1918 | throw Util.generateCsSQLException( |
| 1919 | SQLState.UNIMPLEMENTED_ISOLATION_LEVEL, new Integer(level)); |
| 1920 | } |
| 1921 | |
| 1922 | synchronized(getConnectionSynchronization()) |
| 1923 | { |
| 1924 | getLanguageConnection().setPrepareIsolationLevel(level); |
| 1925 | } |
| 1926 | } |
| 1927 | |
| 1928 | /** |
| 1929 | * Return prepare isolation |
| 1930 | */ |
| 1931 | public int getPrepareIsolation() |
| 1932 | { |
| 1933 | return getLanguageConnection().getPrepareIsolationLevel(); |
| 1934 | } |
| 1935 | |
| 1936 | /** |
| 1937 | Return a unique order number for a result set. |
| 1938 | A unique value is only needed if the result set is |
| 1939 | being created within procedure and thus must be using |
| 1940 | a nested connection. |
| 1941 | */ |
| 1942 | final int getResultSetOrderId() { |
| 1943 | |
| 1944 | if (this == rootConnection) { |
| 1945 | return 0; |
| 1946 | } else { |
| 1947 | return rootConnection.resultSetId++; |
| 1948 | } |
| 1949 | } |
| 1950 | |
| 1951 | protected SQLException newSQLException(String messageId) { |
| 1952 | return Util.generateCsSQLException(messageId); |
| 1953 | } |
| 1954 | protected SQLException newSQLException(String messageId, Object arg1) { |
| 1955 | return Util.generateCsSQLException(messageId, arg1); |
| 1956 | } |
| 1957 | protected SQLException newSQLException(String messageId, Object arg1, Object arg2) { |
| 1958 | return Util.generateCsSQLException(messageId, arg1, arg2); |
| 1959 | } |
| 1960 | |
| 1961 | ///////////////////////////////////////////////////////////////////////// |
| 1962 | // |
| 1963 | // OBJECT OVERLOADS |
| 1964 | // |
| 1965 | ///////////////////////////////////////////////////////////////////////// |
| 1966 | |
| 1967 | /** |
| 1968 | * Get a String representation that uniquely identifies |
| 1969 | * this connection. Include the same information that is |
| 1970 | * printed in the log for various trace and error messages. |
| 1971 | * |
| 1972 | * In Derby the "physical" connection is a LanguageConnectionContext, |
| 1973 | * or LCC. |
| 1974 | * The JDBC Connection is an JDBC-specific layer on top of this. Rather |
| 1975 | * than create a new id here, we simply use the id of the underlying LCC. |
| 1976 | * Note that this is a big aid in debugging, because much of the |
| 1977 | * engine trace and log code prints the LCC id. |
| 1978 | * |
| 1979 | * @return a string representation for this connection |
| 1980 | */ |
| 1981 | public String toString() |
| 1982 | { |
| 1983 | if ( connString == null ) |
| 1984 | { |
| 1985 | |
| 1986 | LanguageConnectionContext lcc = getLanguageConnection(); |
| 1987 | |
| 1988 | connString = |
| 1989 | this.getClass().getName() + "@" + this.hashCode() + " " + |
| 1990 | lcc.xidStr + |
| 1991 | lcc.getTransactionExecute().getTransactionIdString() + |
| 1992 | "), " + |
| 1993 | lcc.lccStr + |
| 1994 | Integer.toString(lcc.getInstanceNumber()) + "), " + |
| 1995 | lcc.dbnameStr + lcc.getDbname() + "), " + |
| 1996 | lcc.drdaStr + lcc.getDrdaID() + ") "; |
| 1997 | } |
| 1998 | |
| 1999 | return connString; |
| 2000 | } |
| 2001 | |
| 2002 | |
| 2003 | } |