package com.c3p0.cn;import org.junit.Test;import com.mchange.v2.c3p0.ComboPooledDataSource;public class C3P0_Test {/*** 硬链接* @throws Exception*/@Testpublic void c3p0_Test_old() throws Exception {ComboPooledDataSource dataSource = new ComboPooledDataSource();//数据源端口池dataSource.setDriverClass("com.mysql.jdbc.Driver");dataSource.setJdbcUrl("jdbc:mysql://localhost:3306/staff");dataSource.setUser("root");dataSource.setPassword("123456");dataSource.setInitialPoolSize(3);//设置初始链接数dataSource.setMaxPoolSize(6);//设置最大连接数dataSource.setMaxIdleTime(3000);//设置最大活跃时间dataSource.getConnection().prepareStatement("delete from user where id = 18").executeUpdate();}/*** 配置方式链接* @throws Exception*/@Testpublic void c3p0_Test() throws Exception {ComboPooledDataSource dataSource = new ComboPooledDataSource();//默认会调用src下面的c3p0_config.xml配置文件dataSource.getConnection().prepareStatement("delete from user where id = 19").executeUpdate();}
}

package com.xinzhi.utils;import org.apache.commons.dbutils.QueryRunner;import com.mchange.v2.c3p0.ComboPooledDataSource;public class JdbcUtils {public static QueryRunner getQueryRunner(){ComboPooledDataSource comboPooledDataSource = new ComboPooledDataSource();QueryRunner queryRunner = new QueryRunner(comboPooledDataSource);return queryRunner;}
}

package com.xinzhi.dao.impl;import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanListHandler;import com.xinzhi.dao.UserDao;
import com.xinzhi.empity.User;
import com.xinzhi.utils.JdbcUtils;public class UserDaoImpl implements UserDao {public List<User> getAll() {QueryRunner queryRunner = JdbcUtils.getQueryRunner();String sql = "select * from userempity";List<User> users = new ArrayList<User>();try {users = queryRunner.query(sql,new BeanListHandler<User>(User.class));} catch (SQLException e) {throw new RuntimeException(e);}return users;}}

<c3p0-config><default-config><property name="driverClass">com.mysql.jdbc.Driver</property><property name="jdbcUrl">jdbc:mysql://localhost:3306/staff</property><property name="user">root</property><property name="password">123456</property></default-config><named-config name="oracle_database"><property name="driverClass">com.mysql.jdbc.Driver</property><property name="jdbcUrl">jdbc:mysql://localhost:3306/staff</property><property name="user">root</property><property name="password">123456</property></named-config></c3p0-config>