Spring声明式事务

1.实体类

@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
    private int id;
    private String name;
    private String pwd;
}

2.UserMapper接口

public interface UserMapper {
    List<User> findUser();

    //添加一个用户
    public int addUser(User user);
    //删除一个用户
    public int deleteUser(int id);
}

3.UserMapper.xml

在这里故意制造一个错误： deletes from user where id=#{id};

<?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.kuang.mapper.UserMapper">
    <select id="findUser" resultType="user">
        select * from user;
    </select>
    <insert id="addUser" parameterType="user">
    insert into mybatis.user(id, name, pwd) values(#{id},#{name},#{pwd})
    </insert>

    <delete id="deleteUser" parameterType="int">
    deletes from user where id=#{id};
    </delete>
</mapper>

4.mybatis-config.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>
        <package name="com.kuang.pojo"/>
    </typeAliases>

</configuration>

5.spring-dao.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: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.xsd
        http://www.springframework.org/schema/aop
         https://www.springframework.org/schema/aop/spring-aop.xsd
         http://www.springframework.org/schema/tx
         https://www.springframework.org/schema/tx/spring-tx.xsd">

    <!--DataSource:使用Spring的数据源替换mybatis的配置-->
    <bean id="datasource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=true&amp;useUnicode=true&amp;characterEncoding=UTF-8&amp;serverTimezone=UTC"/>
        <property name="username" value="root"/>
        <property name="password" value="123"/>
    </bean>

    <!--sqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="datasource"/>
        <!--绑定mybatis核心配置文件-->
        <property name="configLocation" value="mybatis-config.xml"/>
        <property name="mapperLocations" value="classpath:com/kuang/mapper/UserMapper.xml"/>
    </bean>

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

    <!--结合AOP实现事务的织入-->
    <!--配置事务通知-->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <!--给哪些方法配置事务-->
        <!--配置事务的传播特性 new propagation=-->
        <tx:attributes>
            <tx:method name="add" propagation="REQUIRED"/>
            <tx:method name="delete" propagation="REQUIRED"/>
            <tx:method name="update" propagation="REQUIRED"/>
            <tx:method name="query" read-only="true"/>
            <tx:method name="*" propagation="REQUIRED"/>
        </tx:attributes>
    </tx:advice>

    <!--配置事务切入-->
    <aop:config>
        <aop:pointcut id="txPointCut" expression="execution(* com.kuang.mapper.*.*(..))"/>
        <aop:advisor advice-ref="txAdvice" pointcut-ref="txPointCut"/>
    </aop:config>

</beans>

6.UserMapperImpl

在执行findUser()方法时，会执行增加用户和删除用户的操作
但是删除用户会报错，增加用户会执行成功

public class UserMapperImpl  extends SqlSessionDaoSupport implements UserMapper{
    public List<User> findUser() {
        User user = new User(4,"ghh","123");
        UserMapper mapper = getSqlSession().getMapper(UserMapper.class);

        mapper.addUser(user);
        mapper.deleteUser(4);
        return mapper.findUser();
    }

    public int addUser(User user) {
        UserMapper mapper = getSqlSession().getMapper(UserMapper.class);
        return mapper.addUser(user);
    }

    public int deleteUser(int id) {
        UserMapper mapper = getSqlSession().getMapper(UserMapper.class);
        return mapper.deleteUser(id);
    }
}

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

    <import resource="spring-dao.xml"/>
    <bean id="userMapper" class="com.kuang.mapper.UserMapperImpl">
        <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
    </bean>
</beans>

8.测试类

public class MyTest {
    @Test
    public void test() throws IOException {
        ApplicationContext context =
                new ClassPathXmlApplicationContext("applicationContext.xml");
        UserMapper userMapper =
                context.getBean("userMapper", UserMapper.class);
        List<User> users = userMapper.findUser();
        for(User user:users){
            System.out.println(user);
        }
    }
}

增加事务以后，删除失败，添加也会失败。