Configuring Grails to use own DataSource implementation or to proxy the standard DataSource

Question

In an application I want to use my own implementation of javax.sql.DataSource that extends the standard org.apache.commons.dbcp.BasicDataSource use

Answer 1

here is my resources.groovy

import org.codehaus.groovy.grails.commons.ConfigurationHolder as CH

// Place your Spring DSL code here
beans = {

    /**
     * c3P0 pooled data source that forces renewal of DB connections of certain age 
     * to prevent stale/closed DB connections and evicts excess idle connections
     * Still using the JDBC configuration settings from DataSource.groovy
     * to have easy environment specific setup available
     */
    dataSource(com.mchange.v2.c3p0.ComboPooledDataSource) { bean ->
        bean.destroyMethod = 'close'
        //use grails' datasource configuration for connection user, password, driver and JDBC url
        user = CH.config.dataSource.username 
        password = CH.config.dataSource.password
        driverClass = CH.config.dataSource.driverClassName
        jdbcUrl = CH.config.dataSource.url
        //force connections to renew after 2 hours
        maxConnectionAge = 2 * 60 * 60
        //get rid too many of idle connections after 30 minutes 
        maxIdleTimeExcessConnections = 30 * 60
    }

}

i'm using c3p0 ComboPooledDataSource