| 1 | /* |
| 2 | |
| 3 | Derby - Class org.apache.derby.impl.jdbc.EmbedSavepoint30 |
| 4 | |
| 5 | Copyright 2002, 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.jdbc; |
| 22 | |
| 23 | import org.apache.derby.impl.jdbc.EmbedConnection; |
| 24 | import org.apache.derby.impl.jdbc.ConnectionChild; |
| 25 | import org.apache.derby.impl.jdbc.Util; |
| 26 | |
| 27 | import org.apache.derby.iapi.reference.SQLState; |
| 28 | |
| 29 | import org.apache.derby.iapi.error.StandardException; |
| 30 | |
| 31 | import java.sql.Savepoint; |
| 32 | import java.sql.SQLException; |
| 33 | |
| 34 | /** |
| 35 | * This class implements the Savepoint interface from JDBC3.0 |
| 36 | * This allows to set, release, or rollback a transaction to |
| 37 | * designated Savepoints. Savepoints provide finer-grained |
| 38 | * control of transactions by marking intermediate points within |
| 39 | * a transaction. Once a savepoint has been set, the transaction |
| 40 | * can be rolled back to that savepoint without affecting preceding work. |
| 41 | <P><B>Supports</B> |
| 42 | <UL> |
| 43 | <LI> JSR169 - no subsetting for java.sql.Savepoint |
| 44 | <LI> JDBC 3.0 - class introduced in JDBC 3.0 |
| 45 | </UL> |
| 46 | * |
| 47 | * @see java.sql.Savepoint |
| 48 | * |
| 49 | */ |
| 50 | final class EmbedSavepoint30 extends ConnectionChild |
| 51 | implements Savepoint { |
| 52 | |
| 53 | //In order to avoid name conflict, the external names are prepanded |
| 54 | //with "e." and internal names always start with "i." This is for bug 4467 |
| 55 | private final String savepointName; |
| 56 | private final int savepointID; |
| 57 | |
| 58 | ////////////////////////////////////////////////////////////// |
| 59 | // |
| 60 | // CONSTRUCTORS |
| 61 | // |
| 62 | ////////////////////////////////////////////////////////////// |
| 63 | /* |
| 64 | Constructor assumes caller will setup context stack |
| 65 | and restore it. |
| 66 | @exception SQLException on error |
| 67 | */ |
| 68 | EmbedSavepoint30(EmbedConnection conn, String name) |
| 69 | throws StandardException { |
| 70 | super(conn); |
| 71 | if (name == null) //this is an unnamed savepoint |
| 72 | { |
| 73 | //Generating a unique internal name for unnamed savepoints |
| 74 | savepointName = "i." + conn.getLanguageConnection().getUniqueSavepointName(); |
| 75 | savepointID = conn.getLanguageConnection().getUniqueSavepointID(); |
| 76 | } else |
| 77 | { |
| 78 | savepointName = "e." + name; |
| 79 | savepointID = -1; |
| 80 | } |
| 81 | conn.getLanguageConnection().languageSetSavePoint(savepointName, this); |
| 82 | } |
| 83 | |
| 84 | /** |
| 85 | * |
| 86 | * Retrieves the generated ID for the savepoint that this Savepoint object |
| 87 | * represents. |
| 88 | * |
| 89 | * @return the numeric ID of this savepoint |
| 90 | * @exception SQLException if this is a named savepoint |
| 91 | */ |
| 92 | public int getSavepointId() throws SQLException { |
| 93 | if (savepointID == -1) |
| 94 | throw newSQLException(SQLState.NO_ID_FOR_NAMED_SAVEPOINT); |
| 95 | return savepointID; |
| 96 | } |
| 97 | |
| 98 | /** |
| 99 | * |
| 100 | * Retrieves the name of the savepoint that this Savepoint object |
| 101 | * represents. |
| 102 | * |
| 103 | * @return the name of this savepoint |
| 104 | * @exception SQLException if this is an un-named savepoint |
| 105 | */ |
| 106 | public String getSavepointName() throws SQLException { |
| 107 | if (savepointID != -1) |
| 108 | throw newSQLException(SQLState.NO_NAME_FOR_UNNAMED_SAVEPOINT); |
| 109 | return savepointName.substring(2); |
| 110 | } |
| 111 | |
| 112 | //Cloudscape internally keeps name for both named and unnamed savepoints |
| 113 | String getInternalName() { |
| 114 | return savepointName; |
| 115 | } |
| 116 | |
| 117 | |
| 118 | //bug 4468 - verify that savepoint rollback/release is for a savepoint from |
| 119 | //the current connection |
| 120 | boolean sameConnection(EmbedConnection con) { |
| 121 | return (getEmbedConnection().getLanguageConnection() == con.getLanguageConnection()); |
| 122 | } |
| 123 | } |
| 124 | |