spring使用c3p0数据源

1.导入jar包（c3p0）

 

2.在spring配置文件中配置数据源和JdbcTemplate的bean

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

       <!-- 配置数据源（里面存放了若干个连接对象）：数据库交互的。    数据源：c3p0，druid（阿里） -->

       <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">

              <property name="user" value="root"/>

              <property name="password" value="123"/>

              <property name="driverClass" value="com.mysql.jdbc.Driver"></property>

              <property name="jdbcUrl" value="jdbc:mysql://127.0.0.1:3306/test"></property>

       </bean>

      

       <!-- 配置springJdbc的模板类 -->

       <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">

              <property name="dataSource" ref="dataSource"></property>

       </bean>

</beans>

3.在单元测试测试

package com.zhiyou100.kfs.test;

import java.util.ArrayList;

import java.util.List;

import org.junit.jupiter.api.AfterAll;

import org.junit.jupiter.api.BeforeAll;

import org.junit.jupiter.api.Test;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import org.springframework.jdbc.core.BeanPropertyRowMapper;

import org.springframework.jdbc.core.JdbcTemplate;

import org.springframework.jdbc.core.RowMapper;

import com.zhiyou100.kfs.bean.User;

class TestJdbcTemplate {

       private static JdbcTemplate jdbcTemplate;

       @BeforeAll

       static void setUpBeforeClass() throws Exception {

              jdbcTemplate =(JdbcTemplate)new ClassPathXmlApplicationContext("applicationContext.xml").getBean("jdbcTemplate");

       }

       @AfterAll

       static void tearDownAfterClass() throws Exception {

       }

       /**

        *   增删改

        */

       @Test

       void testUpdate() {

              String sql="insert into tb_user (uusername) value('张八');";

              jdbcTemplate.update(sql);

       }

       /**

        *   多条添加

        */

       @Test

       void testBatchUpdate() {

              String sql1="insert into tb_user (uusername) value(?);";

              String sql2="insert into tb_user (uusername) value('张十');";

              List<Object[]> list=new ArrayList<>();

              String[] uusername1=new String[] {new String("张九2")};

              String[] uusername2=new String[] {new String("张九3")};

              jdbcTemplate.batchUpdate(sql1, list);

       }

       /**

        *   查询一条记录

        */

       @Test

       void testQueryOne() {

              String sql="select * from tb_user where u_id=?;";

              RowMapper<User> rowMapper=new BeanPropertyRowMapper<>(User.class);

              User user=jdbcTemplate.queryForObject(sql, rowMapper,1);

              System.out.println(user);

       }

       /**

        *   查询多条记录

        */

       @Test

       void testQueryList() {

              String sql="select * from tb_user;";

              RowMapper<User> rowMapper=new BeanPropertyRowMapper<>(User.class);

              List<User> list=jdbcTemplate.query(sql, rowMapper);

              System.out.println(list);

       }

       /**

        *   查询单值（有多少条记录）

        */

       @Test

       void testQuerySingtonColumn() {

              String sql="select count(u_id) c from tb_user;";

              int a=jdbcTemplate.queryForObject(sql, Integer.class);

              System.out.println(a);

       }

}