Commons DBCP example source code file (JOCLPoolingDriverExample.java)

This example Commons DBCP source code file (JOCLPoolingDriverExample.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, jdbc, joclpoolingdriverexample, joclpoolingdriverexample, resultset, resultset, sql, statement, statement

The Commons DBCP JOCLPoolingDriverExample.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.
 */

import java.sql.DriverManager;
import java.sql.Connection;
import java.sql.Statement;
import java.sql.ResultSet;
import java.sql.SQLException;


//
// Here's a simple example of how to use the PoolingDriver.
// In this example, we'll construct the PoolingDriver implictly
// using the JOCL configuration mechanism.
//
// Note that there is absolutely nothing DBCP specific about
// this code, it's just straight JDBC.  You can simply
// switch connection strings to use the "native" drivers
// directly.
//

//
// To compile this example, you'll need nothing but the JDK (1.2+)
// in your classpath.
//
// To run this example, you'll want:
//  * commons-pool-1.5.4.jar
//  * commons-dbcp-1.2.2.jar
//  * the classes for your (underlying) JDBC driver
//  * sax2.jar (the SAX 2 API)
//  * a SAX2 friendly XML parser (jaxp.jar and parser.jar,
//    for example)
//  * the JOCL configuration for your database connection pool
//    (poolingDriverExample.jocl, for example)
// in your classpath.
//
// Invoke the class using two arguments:
//  * the connect string for the JDBC driver (see below)
//  * the query you'd like to execute
// You'll also want to ensure your both your underlying JDBC
// driver and the org.apache.commons.dbcp.PoolingDriver
// are registered.  You can use the "jdbc.drivers"
// property to do this.  Note that jdbc.drivers is colon
// seperated list, on all platforms.
//
// Depending upon your XML parser, you may need to register
// the "default" SAX driver, using the "org.xml.sax.driver"
// property.
//
// For example, to invoke this class with an Oracle driver only
// (no pooling):
//
//  java -Djdbc.drivers=oracle.jdbc.driver.OracleDriver \
//       -classpath oracle-jdbc.jar:. \
//       JOCLPoolingDriverExample \
//       "jdbc:oracle:thin:scott/tiger@myhost:1521:mysid" \
//       "SELECT * FROM DUAL"
//
// For pooling:
//
//  java -Djdbc.drivers=oracle.jdbc.driver.OracleDriver:org.apache.commons.dbcp.PoolingDriver \
//       -classpath commons-pool-1.5.4.jar:commons-dbcp-1.2.2.jar:oracle-jdbc.jar:jaxp.jar:parser.jar:sax2.jar:. \
//       JOCLPoolingDriverExample \
//       "jdbc:apache:commons:dbcp:/poolingDriverExample" \
//       "SELECT * FROM DUAL"
//
// The last token in DBCP connect string (when suffixed with ".jocl")
// is the resource the PoolingDriver reads as the JOCL configuration.
// See Class.getResource for details on resource loading.
//
public class JOCLPoolingDriverExample {

    public static void main(String[] args) {
        //
        // Just plain-old JDBC.
        //

        Connection conn = null;
        Statement stmt = null;
        ResultSet rset = null;

        try {
            System.out.println("Creating connection.");
            conn = DriverManager.getConnection(args[0]);
            System.out.println("Creating statement.");
            stmt = conn.createStatement();
            System.out.println("Executing statement.");
            rset = stmt.executeQuery(args[1]);
            System.out.println("Results:");
            int numcols = rset.getMetaData().getColumnCount();
            while(rset.next()) {
                for(int i=1;i<=numcols;i++) {
                    System.out.print("\t" + rset.getString(i));
                }
                System.out.println("");
            }
        } catch(SQLException e) {
            e.printStackTrace();
        } finally {
            try { if (rset != null) rset.close(); } catch(Exception e) { }
            try { if (stmt != null) stmt.close(); } catch(Exception e) { }
            try { if (conn != null) conn.close(); } catch(Exception e) { }
        }
    }
}