| 1 | /* |
| 2 | |
| 3 | Derby - Class org.apache.derby.jdbc.XAStatementControl |
| 4 | |
| 5 | Copyright 2003, 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.jdbc; |
| 22 | |
| 23 | import org.apache.derby.iapi.jdbc.BrokeredConnection; |
| 24 | import org.apache.derby.iapi.jdbc.BrokeredStatementControl; |
| 25 | import org.apache.derby.iapi.jdbc.BrokeredStatement; |
| 26 | import org.apache.derby.iapi.jdbc.BrokeredPreparedStatement; |
| 27 | import org.apache.derby.iapi.jdbc.BrokeredCallableStatement; |
| 28 | import org.apache.derby.iapi.jdbc.EngineStatement; |
| 29 | import org.apache.derby.impl.jdbc.EmbedConnection; |
| 30 | import org.apache.derby.impl.jdbc.EmbedResultSet; |
| 31 | import org.apache.derby.impl.jdbc.EmbedStatement; |
| 32 | import org.apache.derby.impl.jdbc.EmbedPreparedStatement; |
| 33 | |
| 34 | import java.sql.*; |
| 35 | |
| 36 | /** |
| 37 | The Statement returned by an Connection returned by a XAConnection |
| 38 | needs to float across the underlying real connections. We do this by implementing |
| 39 | a wrapper statement. |
| 40 | */ |
| 41 | final class XAStatementControl implements BrokeredStatementControl { |
| 42 | |
| 43 | /** |
| 44 | */ |
| 45 | private final EmbedXAConnection xaConnection; |
| 46 | private final BrokeredConnection applicationConnection; |
| 47 | BrokeredStatement applicationStatement; |
| 48 | private EmbedConnection realConnection; |
| 49 | private Statement realStatement; |
| 50 | private PreparedStatement realPreparedStatement; |
| 51 | private CallableStatement realCallableStatement; |
| 52 | |
| 53 | private XAStatementControl(EmbedXAConnection xaConnection) { |
| 54 | this.xaConnection = xaConnection; |
| 55 | this.realConnection = xaConnection.realConnection; |
| 56 | this.applicationConnection = xaConnection.currentConnectionHandle; |
| 57 | } |
| 58 | |
| 59 | XAStatementControl(EmbedXAConnection xaConnection, |
| 60 | Statement realStatement) throws SQLException { |
| 61 | this(xaConnection); |
| 62 | this.realStatement = realStatement; |
| 63 | this.applicationStatement = applicationConnection.newBrokeredStatement(this); |
| 64 | |
| 65 | ((EmbedStatement) realStatement).setApplicationStatement( |
| 66 | applicationStatement); |
| 67 | } |
| 68 | XAStatementControl(EmbedXAConnection xaConnection, |
| 69 | PreparedStatement realPreparedStatement, |
| 70 | String sql, Object generatedKeys) throws SQLException { |
| 71 | this(xaConnection); |
| 72 | this.realPreparedStatement = realPreparedStatement; |
| 73 | this.applicationStatement = applicationConnection.newBrokeredStatement(this, sql, generatedKeys); |
| 74 | ((EmbedStatement) realPreparedStatement).setApplicationStatement( |
| 75 | applicationStatement); |
| 76 | } |
| 77 | XAStatementControl(EmbedXAConnection xaConnection, |
| 78 | CallableStatement realCallableStatement, |
| 79 | String sql) throws SQLException { |
| 80 | this(xaConnection); |
| 81 | this.realCallableStatement = realCallableStatement; |
| 82 | this.applicationStatement = applicationConnection.newBrokeredStatement(this, sql); |
| 83 | ((EmbedStatement) realCallableStatement).setApplicationStatement( |
| 84 | applicationStatement); |
| 85 | } |
| 86 | |
| 87 | public Statement getRealStatement() throws SQLException { |
| 88 | |
| 89 | // |
| 90 | if (applicationConnection == xaConnection.currentConnectionHandle) { |
| 91 | |
| 92 | // Application connection is the same. |
| 93 | if (realConnection == xaConnection.realConnection) |
| 94 | return realStatement; |
| 95 | |
| 96 | // If we switched back to a local connection, and the first access is through |
| 97 | // a non-connection object (e.g. statement then realConnection will be null) |
| 98 | if (xaConnection.realConnection == null) { |
| 99 | // force the connection |
| 100 | xaConnection.getRealConnection(); |
| 101 | } |
| 102 | |
| 103 | // underlying connection has changed. |
| 104 | // create new Statement |
| 105 | Statement newStatement = applicationStatement.createDuplicateStatement(xaConnection.realConnection, realStatement); |
| 106 | ((EmbedStatement) realStatement).transferBatch((EmbedStatement) newStatement); |
| 107 | |
| 108 | try { |
| 109 | realStatement.close(); |
| 110 | } catch (SQLException sqle) { |
| 111 | } |
| 112 | |
| 113 | realStatement = newStatement; |
| 114 | realConnection = xaConnection.realConnection; |
| 115 | ((EmbedStatement) realStatement).setApplicationStatement( |
| 116 | applicationStatement); |
| 117 | } |
| 118 | else { |
| 119 | // application connection is different, therefore the outer application |
| 120 | // statement is closed, so just return the realStatement. It should be |
| 121 | // closed by virtue of its application connection being closed. |
| 122 | } |
| 123 | return realStatement; |
| 124 | } |
| 125 | |
| 126 | public PreparedStatement getRealPreparedStatement() throws SQLException { |
| 127 | // |
| 128 | if (applicationConnection == xaConnection.currentConnectionHandle) { |
| 129 | // Application connection is the same. |
| 130 | if (realConnection == xaConnection.realConnection) |
| 131 | return realPreparedStatement; |
| 132 | |
| 133 | // If we switched back to a local connection, and the first access is through |
| 134 | // a non-connection object (e.g. statement then realConnection will be null) |
| 135 | if (xaConnection.realConnection == null) { |
| 136 | // force the connection |
| 137 | xaConnection.getRealConnection(); |
| 138 | } |
| 139 | |
| 140 | // underlying connection has changed. |
| 141 | // create new PreparedStatement |
| 142 | PreparedStatement newPreparedStatement = |
| 143 | ((BrokeredPreparedStatement) applicationStatement).createDuplicateStatement(xaConnection.realConnection, realPreparedStatement); |
| 144 | |
| 145 | |
| 146 | // ((EmbedStatement) realPreparedStatement).transferBatch((EmbedStatement) newPreparedStatement); |
| 147 | ((EmbedPreparedStatement) realPreparedStatement).transferParameters((EmbedPreparedStatement) newPreparedStatement); |
| 148 | |
| 149 | try { |
| 150 | realPreparedStatement.close(); |
| 151 | } catch (SQLException sqle) { |
| 152 | } |
| 153 | |
| 154 | realPreparedStatement = newPreparedStatement; |
| 155 | realConnection = xaConnection.realConnection; |
| 156 | ((EmbedStatement) realPreparedStatement).setApplicationStatement( |
| 157 | applicationStatement); |
| 158 | } |
| 159 | else { |
| 160 | // application connection is different, therefore the outer application |
| 161 | // statement is closed, so just return the realStatement. It should be |
| 162 | // closed by virtue of its application connection being closed. |
| 163 | } |
| 164 | return realPreparedStatement; |
| 165 | } |
| 166 | |
| 167 | public CallableStatement getRealCallableStatement() throws SQLException { |
| 168 | if (applicationConnection == xaConnection.currentConnectionHandle) { |
| 169 | // Application connection is the same. |
| 170 | if (realConnection == xaConnection.realConnection) |
| 171 | return realCallableStatement; |
| 172 | |
| 173 | // If we switched back to a local connection, and the first access is through |
| 174 | // a non-connection object (e.g. statement then realConnection will be null) |
| 175 | if (xaConnection.realConnection == null) { |
| 176 | // force the connection |
| 177 | xaConnection.getRealConnection(); |
| 178 | } |
| 179 | |
| 180 | // underlying connection has changed. |
| 181 | // create new PreparedStatement |
| 182 | CallableStatement newCallableStatement = |
| 183 | ((BrokeredCallableStatement) applicationStatement).createDuplicateStatement(xaConnection.realConnection, realCallableStatement); |
| 184 | |
| 185 | ((EmbedStatement) realCallableStatement).transferBatch((EmbedStatement) newCallableStatement); |
| 186 | |
| 187 | try { |
| 188 | realCallableStatement.close(); |
| 189 | } catch (SQLException sqle) { |
| 190 | } |
| 191 | |
| 192 | realCallableStatement = newCallableStatement; |
| 193 | realConnection = xaConnection.realConnection; |
| 194 | ((EmbedStatement) realCallableStatement).setApplicationStatement( |
| 195 | applicationStatement); |
| 196 | } |
| 197 | else { |
| 198 | // application connection is different, therefore the outer application |
| 199 | // statement is closed, so just return the realStatement. It should be |
| 200 | // closed by virtue of its application connection being closed. |
| 201 | } |
| 202 | return realCallableStatement; |
| 203 | } |
| 204 | |
| 205 | /** |
| 206 | * Don't need to wrap the ResultSet but do need to update its |
| 207 | * application Statement reference to be the one the application |
| 208 | * used to create the ResultSet. |
| 209 | */ |
| 210 | public ResultSet wrapResultSet(Statement s, ResultSet rs) { |
| 211 | if (rs != null) |
| 212 | ((EmbedResultSet) rs).setApplicationStatement(s); |
| 213 | return rs; |
| 214 | } |
| 215 | |
| 216 | /** |
| 217 | Can cursors be held across commits. |
| 218 | */ |
| 219 | public int checkHoldCursors(int holdability) throws SQLException { |
| 220 | return xaConnection.checkHoldCursors(holdability, true); |
| 221 | } |
| 222 | } |