jdbc-连接池(推荐)

jdbcUtil.java

package a_utils;

import javax.sql.DataSource;

import org.apache.commons.dbutils.QueryRunner;

import com.mchange.v2.c3p0.ComboPooledDataSource;

public class jdbcUtils {

    /*
     * 1.初始化C3P0连接池
     * */
    private static DataSource dataSource;
    static{
        dataSource = new ComboPooledDataSource();
    }

    /*
     * 2.创建DBUtils核心工具类对象
     * */
    public static QueryRunner getQueryRunner(){
        //创建QueryRunner对象，传入连接池对象
        //在创建QueryRunner对象的时候，如果传入了数据源对象；
        //那么在使用QueryRunner对象方法的时候，就不需要传入连接对象；
        //会自动从数据源中获取连接(不用关闭连接)
        return new QueryRunner(dataSource);
    }

}

c3p0-config.xml

<c3p0-config>
  <default-config>
     <property name="driverClass">com.mysql.jdbc.Driverproperty> 
     <property name="jdbcUrl">jdbc:mysql:///testproperty> 
     <property name="user">rootproperty> 
     <property name="password">rootproperty> 
     <property name="initialPoolSize">5property> 
     <property name="maxPoolSize">10property> 

  default-config>


  <named-config name="oracleConfig">
    <property name="driverClass">com.mysql.jdbc.Driverproperty> 
     <property name="jdbcUrl">jdbc:mysql:///testproperty> 
     <property name="user">rootproperty> 
     <property name="password">rootproperty> 
     <property name="initialPoolSize">5property> 
     <property name="maxPoolSize">10property> 
   named-config>

c3p0-config>