Use spring c3p0 data source

1. Import jar package (the c3p0)

2. The configuration of the data source and the bean JdbcTemplate spring configuration file

<?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">

<! - source configuration data (stored inside a number of connection objects): database interaction. Data source: c3p0, druid (Ali) ->

</bean>

<-! SpringJdbc template class configuration ->

</bean>

</beans>

3. Unit Testing

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);

}

Use spring c3p0 data source

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