C3P0连接池工具类使用

c3p0的基本连接配置文件 c3p0-config.xml

<c3p0-config>

    <default-config>
        <property name="driverClass">com.mysql.jdbc.Driver</property>
        <property name="jdbcUrl">jdbc:mysql:///mybase</property>
        <property name="user">root</property>
        <property name="password">123456</property>
        <property name="initialPoolSize">5</property>
        <property name="maxPoolSize">20</property>
    </default-config>

    <named-config name="another">
        <property name="driverClass">com.mysql.jdbc.Driver</property>
        <property name="jdbcUrl">jdbc:mysql:///mybase</property>
        <property name="user">root</property>
        <property name="password">123456</property>
    </named-config>

</c3p0-config>

c3p0工具类

package cn.cc.jdbc.utls;

import java.sql.Connection;
import java.sql.SQLException;

import javax.sql.DataSource;

import com.mchange.v2.c3p0.ComboPooledDataSource;

public class C3P0Utils {
    private static ComboPooledDataSource dataSource=new ComboPooledDataSource();
    public  static DataSource getDataSource(){
        return dataSource;
    }

    public static Connection getConnection(){
        try{
            return dataSource.getConnection();
        }catch (SQLException e){
            throw new RuntimeException(e);
        }
    }
}

测试类

public class TestC3p0 {

    @Test
    public void testAddUser1(){
        Connection conn=null;
        PreparedStatement ps=null;

        try{
            //2.从池子中获取连接
            conn=C3P0Utils.getConnection();
            String sql="insert into tbl_user values(null,?,?)";
            //3.必须在自定义的connection实现类中重写preparedStatement方法
            ps=conn.prepareStatement(sql);
            ps.setString(1, "吕布3");
            ps.setString(2, "貂蝉3");
            int rows=ps.executeUpdate();
            if(rows>0){
                System.out.println("添加成功");
            }else{
                System.out.println("添加失败");
            }
        }catch (Exception e){
            throw new RuntimeException(e);
        }finally {
            JDBCUtils_v3.release(conn, ps, null);
        }
    }

}