spring与mybatis整合及事务控制

一. 简介

本文将会使用spring整合mybatis, 并添加事务管理, 以此为记, 方便以后查阅。

二. 例子

1. 代码结构图：

2. 建表语句：

DROP DATABASE test;
CREATE DATABASE test;  

USE test;  

CREATE TABLE USER(
  id VARCHAR(36) PRIMARY KEY,
  username VARCHAR(64),
  address VARCHAR(128)
)  

INSERT INTO USER (id, username, address) VALUES("001", "zhangsan", "Wuhan");
INSERT INTO USER (id, username, address) VALUES("002", "lisi", "Shanghai");   

3. 实体类：

public class User {

	private String id;

	private String uname;

	private String address;

	@Override
	public String toString() {
		return "id: " + id + ", uname: " + uname + ", address: " + address;
	}
}

// 省略getter与setter方法

4. 实体映射配置：user.xml

<?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.zdp.domain.User">

	<resultMap type="User" id="userBean">
		<id column="id" property="id"/>
		<result column="username" property="uname"/>
		<result column="address" property="address"/>
	</resultMap>

	<select id="selectUserById" parameterType="string" resultMap="userBean">
		select * from user where id = #{id}
	</select>

	<update id="updateUserByCondition" parameterType="User">
		update user
		<set>
			<if test="uname != null">
				username = #{uname} ,
			</if>
			<if test="address != null">
				address = #{address}
			</if>
		</set>
		where id = #{id}
	</update>

</mapper>

5. service接口：

public interface UserService {
	void updateUser(User user);
}

6. service实现：

public class UserServiceImpl implements UserService {

	private UserDao userDao;

	public void setUserDao(UserDao userDao) {
		this.userDao = userDao;
	}

	@Override
	public void updateUser(User user) {
		userDao.updateUser(user);
		System.out.println(1/0); // 运行时异常
	}
}

7. dao接口：

public interface UserDao {
	User findUserById(String id);
	void updateUser(User user);
}

8. dao实现：

public class UserDaoImpl extends SqlSessionDaoSupport implements UserDao {

	@Override
	public User findUserById(String id) {
		SqlSession sqlSession = super.getSqlSession();
		User user = (User) sqlSession.selectOne(User.class.getName() + ".selectUserById", id);
		return user;
	}

	@Override
	public void updateUser(User user) {
		super.getSqlSession().update(User.class.getName() + ".updateUserByCondition", user);
	}
}

9. mybatis总配置：sqlMapConfig.xml

<?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>
	<typeAliases>
		<typeAlias type="com.zdp.domain.User" alias="User"/>
	</typeAliases>
	<mappers>
		<!-- 映射文件的位置  -->
		<mapper resource="com/zdp/domain/User.xml" />
	</mappers>
</configuration>

10. spring配置：ApplicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:aop="http://www.springframework.org/schema/aop"
	xmlns:tx="http://www.springframework.org/schema/tx"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-3.0.xsd
    http://www.springframework.org/schema/tx
    http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
    http://www.springframework.org/schema/aop
    http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">

	<!-- 配置数据源 -->
	<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
		<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
		<property name="url" value="jdbc:mysql:///test"/>
		<property name="username" value="root"/>
		<property name="password" value="root"/>

		<!-- 请测试另一种 配置数据库连接方式 -->
	</bean>

	<!-- session工厂 -->
	<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
		<property name="dataSource" ref="dataSource" />

		<!-- mybatis总配置文件的位置 -->
		<property name="configLocation" value="classpath:sqlMapConfig.xml"/>
	</bean>

	<!-- 配置事务管理 -->
	<bean name="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
		<property name="dataSource" ref="dataSource"/>
	</bean>

	<tx:advice id="transactionAdvice" transaction-manager="transactionManager">
	    <tx:attributes>
	        <tx:method name="delete*" propagation="REQUIRED" />
	        <tx:method name="save*" propagation="REQUIRED" />
	        <tx:method name="update*" propagation="REQUIRED" />
	        <tx:method name="find*" read-only="true" />
	        <tx:method name="get*" read-only="true" />
	        <tx:method name="select*" read-only="true" />
	    </tx:attributes>
	</tx:advice>  

	<aop:config>
	    <!-- 第一个"*"代表所有类, 第二个"*"代表所有方法, ".."代表任意参数 -->
	    <aop:pointcut id="pointcut" expression="execution(* com.zdp.service.*.*(..))" />  

	    <!-- 把事务控制在service层 -->
	    <aop:advisor pointcut-ref="pointcut" advice-ref="transactionAdvice" />
	</aop:config> 

	<!-- 业务处理 -->
	<bean id="userDao" class="com.zdp.dao.impl.UserDaoImpl">
		<property name="sqlSessionFactory" ref="sqlSessionFactory" />
	</bean>

	<bean id="userService" class="com.zdp.service.impl.UserServiceImpl">
		<property name="userDao" ref="userDao"/>
	</bean>
</beans>

11. junit测试：

public class SpringTest {
	private ApplicationContext context;

	@Before
	public void sprintInit() {
		context = new ClassPathXmlApplicationContext("ApplicationContext.xml");
	}

	@Test
	public void testFindUserById() {
		UserDao userDao = (UserDao) context.getBean("userDao");
		User user = userDao.findUserById("001");
		System.out.println(user);
	}	

	@Test
	public void testUpdateUser() {
		UserService userService = (UserService) context.getBean("userService");
		User user = new User();
		user.setId("001");
		user.setUname("zhangsan1");
		userService.updateUser(user);
	}
}