Mybatis学习笔记（八）--整合spring

版权声明：版权归JansonLin所有，转载请标明出处。 https://blog.csdn.net/Janson_Lin/article/details/84257779

一.整合思路

1. SqlSessionFactory对象应该放到spring容器中作为单例存在。
2. 传统dao的开发方式中，应该从spring容器中获得sqlsession对象。
3. Mapper代理形式中，应该从spring容器中直接获得mapper的代理对象。
4. 数据库的连接以及数据库连接池事务管理都交给spring容器来完成。

二.需要的jar包

1. spring的jar包
2. Mybatis的jar包
3. Spring+mybatis的整合包。
4. Mysql的数据库驱动jar包。
5. 数据库连接池的jar包

ps：需要jar可以留言邮箱，博主会发给你，后期代码上传到Github，大家可以去clone或者下载！！！

程序目录

三.配置applicationContext.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
	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-4.0.xsd
	http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
	http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
	http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd">

	<!-- 配置jdbc -->
	<context:property-placeholder location="classpath:jdbc.properties"/>
	
	<!-- 配置DataSource数据源 -->
	<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
		destroy-method="close">
		<property name="driverClassName" value="${jdbc.driver}" />
		<property name="url" value="${jdbc.url}" />
		<property name="username" value="${jdbc.username}" />
		<property name="password" value="${jdbc.password}" />
		<property name="maxActive" value="10" />
		<property name="maxIdle" value="5" />
	</bean>
	
	<!-- 配置mybatis工厂 -->
	<bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
		<property name="dataSource" ref="dataSource"/>
		<!-- 核心配置文件的位置 -->
		<property name="configLocation" value="classpath:sqlMapConfig.xml"/>
	</bean>
	
	<!-- 
		dao开发
		1.可以自动注入respority
		2.手动注入
	 -->
	 <!-- <bean id="userDao" class="com.janson.dao.UserDaoImpl">
	 	注入sqlSessionFactory工厂
	 	<property name="sqlSessionFactory" ref="sqlSessionFactoryBean"/>
	 </bean> -->
	 
	 <!-- 
	 	Mapper动态代理开发
	 	这里以userMapper为例子
	  -->
	  <bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">
	  	<!-- 
	  		这里的sqlSessionFactory相当于在之钱mapper开发中的
	  		SqlSession session = sqlSessionFactory.openSession();
	  		这一句代码的作用是一样，获得SqlSession
	  	 -->
		<property name="sqlSessionFactory" ref="sqlSessionFactoryBean"/>
		<!-- 
			这里的mapperInterface也就是相当于获得mapper
			UserMapper userMapper = session.getMapper(UserMapper.class);
		 -->
		<property name="mapperInterface" value="com.janson.mapper.UserMapper"/>
	</bean>
	
</beans>

四.配置jdbc.properties与log4j.properties文件

jdbc.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/db_mybatis?characterEncoding=utf-8
jdbc.username=root
jdbc.password=root

log4j.properties

# Global logging configuration
log4j.rootLogger=DEBUG, stdout
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n

五.配置sqlMapConfig.xml文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <!-- 配置别名 -->
	<typeAliases>
		<package name="com.janson.pojo"/>
	</typeAliases>
    <!-- 包映射 -->
	<mappers>
		<package name="com.janson.mapper"/>
	</mappers>
</configuration>

六.Mapper.xml与UserMapper.java

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.janson.mapper.UserMapper">
	<!-- 通过ID查询一个用户 -->
	<select id="findUserById" parameterType="Integer" resultType="User">
		select * from user where id = #{v}
	</select>
</mapper>

package com.janson.mapper;

import com.janson.pojo.User;

public interface UserMapper {
	
	public User findUserById(Integer id);

}

七.测试代码

package com.janson.test;

import static org.junit.Assert.*;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.janson.mapper.UserMapper;
import com.janson.pojo.User;

public class MybaitsAndSringTest {

	//非增强版的测试  导入的是接口的地址
	@Test
	public void findUserByIdTest() throws Exception {
		//获得spring
		ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
		UserMapper mapper = (UserMapper) context.getBean("userMapper");
		User user = mapper.findUserById(2);
		System.out.println(user);
	}
	
	//非增强版的测试  导入的是接口的地址
	@Test
	public void findUserByIdTest2() throws Exception {
		//获得spring
		ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
		UserMapper mapper = context.getBean(UserMapper.class);
		User user = mapper.findUserById(2);
		System.out.println(user);
	}
	
}

八.测试结果