c3p0连接池

配置信息便不写了，其中，配置中有ComboPooledDataSource这个类：

 

<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"  
        destroy-method="close">  

 ComboPooledDataSource类继承自AbstractPoolBackedDataSource，该类继承PooledDataSource->DataSource接口，实现了getConnection()方法，该方法实现如下：

 

public Connection getConnection() throws SQLException {
       PooledConnection pc = this.getPoolManager().getPool().checkoutPooledConnection();
       return pc.getConnection();
    }
 
    public Connection getConnection(String username, String password) throws SQLException {
       PooledConnection pc = this.getPoolManager().getPool(username, password).checkoutPooledConnection();
       return pc.getConnection();
    }

 其中，getPoolManager()、getPool()、checkoutPooledConnection()这三个方法对应于C3P0PooledConnectionPoolManager连接池的管理类，C3P0PooledConnectionPool连接池类，BasicResourcePool真正管理数据库连接池的类。

 

待续。。。