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Commons DBCP example source code file (PoolableCallableStatement.java)
The Commons DBCP PoolableCallableStatement.java source code/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.apache.commons.dbcp; import java.sql.CallableStatement; import java.sql.Connection; import java.sql.ResultSet; import java.sql.SQLException; import java.util.List; import org.apache.commons.pool.KeyedObjectPool; /** * A {@link DelegatingCallableStatement} that cooperates with * {@link PoolingConnection} to implement a pool of {@link CallableStatement}s. * <p> * The {@link #close} method returns this statement to its containing pool. (See {@link PoolingConnection}.) * * @see PoolingConnection * @version $Revision: 883040 $ $Date: 2009-11-22 01:01:20 -0500 (Sun, 22 Nov 2009) $ * @since 1.3 */ public class PoolableCallableStatement extends DelegatingCallableStatement implements CallableStatement { /** * The {@link KeyedObjectPool} from which this CallableStatement was obtained. */ private final KeyedObjectPool _pool; /** * Key for this statement in the containing {@link KeyedObjectPool}. */ private final Object _key; /** * Constructor. * * @param stmt the underlying {@link CallableStatement} * @param key the key for this statement in the {@link KeyedObjectPool} * @param pool the {@link KeyedObjectPool} from which this CallableStatement was obtained * @param conn the {@link Connection} that created this CallableStatement */ public PoolableCallableStatement(CallableStatement stmt, Object key, KeyedObjectPool pool, Connection conn) { super((DelegatingConnection)conn, stmt); _pool = pool; _key = key; // Remove from trace now because this statement will be // added by the activate method. if(_conn != null) { _conn.removeTrace(this); } } /** * Returns the CallableStatement to the pool. If {{@link #isClosed()}, this is a No-op. */ public void close() throws SQLException { // calling close twice should have no effect if (!isClosed()) { try { _pool.returnObject(_key,this); } catch(SQLException e) { throw e; } catch(RuntimeException e) { throw e; } catch(Exception e) { throw new SQLNestedException("Cannot close CallableStatement (return to pool failed)", e); } } } /** * Activates after retrieval from the pool. Adds a trace for this CallableStatement to the Connection * that created it. */ protected void activate() throws SQLException { _closed = false; if( _conn != null ) { _conn.addTrace( this ); } super.activate(); } /** * Passivates to prepare for return to the pool. Removes the trace associated with this CallableStatement * from the Connection that created it. Also closes any associated ResultSets. */ protected void passivate() throws SQLException { _closed = true; if( _conn != null ) { _conn.removeTrace(this); } // The JDBC spec requires that a statment close any open // ResultSet's when it is closed. // FIXME The PreparedStatement we're wrapping should handle this for us. // See DBCP-10 for what could happen when ResultSets are closed twice. List resultSets = getTrace(); if(resultSets != null) { ResultSet[] set = (ResultSet[])resultSets.toArray(new ResultSet[resultSets.size()]); for(int i = 0; i < set.length; i++) { set[i].close(); } clearTrace(); } super.passivate(); } } Other Commons DBCP examples (source code examples)Here is a short list of links related to this Commons DBCP PoolableCallableStatement.java source code file: |
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