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## How to use Jakarta's DBCP for connection pooling

Introduction
Intended audience
Steps
Configuration
References

## Introduction

This HOW-TO provide users with instructions on hot to configure Castor JDO so that Apache Jakarta's DBCP package is used as a connection pool.

## Intended audience

Anyone who wants to use DBCP as connection pool mechanism with Castor JDO.

## Steps

Below are defined the steps to configure Castor JDO to use DBCP's `BasicDataSource` for connection pooling.

### Configuration

To use a DBCP `BasicDataSource` with Castor JDO, please provide the following `<data-source>` entry in the jdo-conf.xml file.

      <data-source class-name="org.apache.commons.dbcp.BasicDataSource">
        <param name="driver-class-name" value="com.mysql.jdbc.Driver" />
        <param name="username" value="test" />
        <param name="password" value="test" />
        <param name="url" value="jdbc:mysql://localhost/test" />
        <param name="min-active" value="10" />
        <param name="max-active" value="40" />
      </data-source>

Above example makes use of the mySQL JDBC driver to establish a connection pool to a mySQL instance named 'test' running on the same machine as Castor itself. The pool initially holds 10 connections, but is configured to allow a maximum of 40 active connections at the same time.

## References

- | Other pooling examples

<notice> Copyright © 1999-2005 ExoLab Group, Intalio Inc., and Contributors. All rights reserved. </notice>
<notice> Java, EJB, JDBC, JNDI, JTA, Sun, Sun Microsystems are trademarks or registered trademarks of Sun Microsystems, Inc. in the United States and in other countries. XML, XML Schema, XSLT and related standards are trademarks or registered trademarks of MIT, INRIA, Keio or others, and a product of the World Wide Web Consortium. All other product names mentioned herein are trademarks of their respective owners. </notice>