Commons DBCP example source code file (TestPStmtPooling.java)

This example Commons DBCP source code file (TestPStmtPooling.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Commons DBCP tags/keywords

connection, connection, datasource, delegatingstatement, delegatingstatement, drivermanagerconnectionfactory, generickeyedobjectpoolfactory, genericobjectpool, jdbc, poolableconnectionfactory, poolingdatasource, poolingdatasource, sql, statement, statement, testerdriver

The Commons DBCP TestPStmtPooling.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.Connection;
import java.sql.Statement;
import java.sql.SQLException;

import javax.sql.DataSource;

import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;

import org.apache.commons.pool.KeyedObjectPoolFactory;
import org.apache.commons.pool.ObjectPool;
import org.apache.commons.pool.impl.GenericKeyedObjectPoolFactory;
import org.apache.commons.pool.impl.GenericObjectPool;

/**
 * TestSuite for BasicDataSource with prepared statement pooling enabled
 * 
 * @author Dirk Verbeeck
 * @version $Revision: 882981 $ $Date: 2009-11-21 15:04:53 -0500 (Sat, 21 Nov 2009) $
 */
public class TestPStmtPooling extends TestCase {
    public TestPStmtPooling(String testName) {
        super(testName);
    }

    public static Test suite() {
        return new TestSuite(TestPStmtPooling.class);
    }

    public void testStmtPool() throws Exception {
        new TesterDriver();
        ConnectionFactory connFactory = new DriverManagerConnectionFactory(
                "jdbc:apache:commons:testdriver","u1","p1");

        ObjectPool connPool = new GenericObjectPool();
        KeyedObjectPoolFactory stmtPoolFactory = new GenericKeyedObjectPoolFactory(null);

        new PoolableConnectionFactory(connFactory, connPool, stmtPoolFactory,
                null, false, true);

        DataSource ds = new PoolingDataSource(connPool);

        Connection conn = ds.getConnection();
        Statement stmt1 = conn.prepareStatement("select 1 from dual");
        Statement ustmt1 = ((DelegatingStatement) stmt1).getInnermostDelegate();
        stmt1.close();
        Statement stmt2 = conn.prepareStatement("select 1 from dual");
        Statement ustmt2 = ((DelegatingStatement) stmt2).getInnermostDelegate();
        stmt2.close();
        assertSame(ustmt1, ustmt2);
    }
    
    public void testCallableStatementPooling() throws Exception {
        new TesterDriver();
        ConnectionFactory connFactory = new DriverManagerConnectionFactory(
                "jdbc:apache:commons:testdriver","u1","p1");

        ObjectPool connPool = new GenericObjectPool();
        KeyedObjectPoolFactory stmtPoolFactory = new GenericKeyedObjectPoolFactory(null);

        new PoolableConnectionFactory(connFactory, connPool, stmtPoolFactory,
                null, false, true);

        DataSource ds = new PoolingDataSource(connPool);

        Connection conn = ds.getConnection();
        Statement stmt1 = conn.prepareStatement("select 1 from dual");
        Statement ustmt1 = ((DelegatingStatement) stmt1).getInnermostDelegate();
        Statement cstmt1 = conn.prepareCall("{call home}");
        Statement ucstmt1 = ((DelegatingStatement) cstmt1).getInnermostDelegate();
        stmt1.close();  // Return to pool
        cstmt1.close(); // ""
        Statement stmt2 = conn.prepareStatement("select 1 from dual"); // Check out from pool
        Statement ustmt2 = ((DelegatingStatement) stmt2).getInnermostDelegate();
        Statement cstmt2 = conn.prepareCall("{call home}");
        Statement ucstmt2 = ((DelegatingStatement) cstmt2).getInnermostDelegate();
        stmt2.close();  // Return to pool
        cstmt2.close(); // ""
        assertSame(ustmt1, ustmt2);
        assertSame(ucstmt1, ucstmt2);
        // Verify key distinguishes Callable from Prepared Statements in the pool
        Statement stmt3 = conn.prepareCall("select 1 from dual");
        Statement ustmt3 = ((DelegatingStatement) stmt3).getInnermostDelegate();
        stmt3.close();
        assertNotSame(ustmt1, ustmt3);
        assertNotSame(ustmt3, ucstmt1);
    }
    
    public void testClosePool() throws Exception {
        new TesterDriver();
        ConnectionFactory connFactory = new DriverManagerConnectionFactory(
                "jdbc:apache:commons:testdriver","u1","p1");

        ObjectPool connPool = new GenericObjectPool();
        KeyedObjectPoolFactory stmtPoolFactory = new GenericKeyedObjectPoolFactory(null);

        new PoolableConnectionFactory(connFactory, connPool, stmtPoolFactory,
                null, false, true);

        DataSource ds = new PoolingDataSource(connPool);
        ((PoolingDataSource) ds).setAccessToUnderlyingConnectionAllowed(true);

        Connection conn = ds.getConnection();
        conn.prepareStatement("select 1 from dual");
        
        Connection poolableConnection = ((DelegatingConnection) conn).getDelegate();
        Connection poolingConnection = 
            ((DelegatingConnection) poolableConnection).getDelegate();
        poolingConnection.close();
        try {
            conn.prepareStatement("select 1 from dual");
            fail("Expecting SQLException");
        } catch (SQLException ex) {
            assertTrue(ex.getMessage().endsWith("invalid PoolingConnection."));
        }     
    }
}