Java Spring声明式事务

Spring声明式事务

事务：要么都成功，要么都失败，十分重要，涉及到数据一致性，确保完整性和一致性。

事务的acid原则：

原子性
一致性
隔离性
多个业务可能操作一个资源，防止数据损坏
持久性
事务一旦提交，无论系统发生什么问题，结果都不会被影响。

Spring中的事务管理

声明式事务
编程式事务

声明式事务

<?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:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation="http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/tx https://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/aop https://www.springframework.org/schema/aop/spring-tx.aop">
    <!--data source-->
    <bean id="datasource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://111.230.212.103:3306/mybatis?userSSL=true& userUnicode=true&characterEncoding=UTF-8"/>
        <property name="username" value="root"/>
        <property name="password" value="hdk123"/>
    </bean>
    <!--sqlsession-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="datasource" />
        <!--bound mybatis-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
        <property name="mapperLocations" value="classpath:com/mapper/*.xml"/>
    </bean>
    <!--声明式事务-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <constructor-arg ref="datasource" />
    </bean>
    <!--结合aop实现事务置入-->
    <!--配置事务的类-->
    <tx:advice id="tx1" transaction-manager="transactionManager">
        <!--给哪些方法配置事务-->
        <!--配置事务的传播特性-->
        <tx:attributes>
            <tx:method name="add" propagation="REQUIRED"/>
            <tx:method name="delete" propagation="REQUIRED"/>
            <tx:method name="update" propagation="REQUIRED"/>
            <tx:method name="*" propagation="REQUIRED"/>
            <tx:method name="query" read-only="true"/>
        </tx:attributes>
    </tx:advice>
    <!--配置事务切入-->
    <aop:config>
        <aop:pointcut id="txpointxut" expression="execution(* com.mapper.*.*(..))"/>
        <aop:advisor advice-ref="tx1" pointcut-ref="txpointxut"/>
    </aop:config>
</beans>
<?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 https://www.springframework.org/schema/beans/spring-beans.xsd">
    <import resource="spring-dao.xml"/>
    <bean id="userMapper2" class="com.mapper.UserMapperIml2">
        <property name="sqlSessionFactory" ref="sqlSessionFactory"></property>
    </bean>
</beans>

Mapper

package com.mapper;
import com.pojo.User;
import java.util.List;
public interface UserMapper { 
    List<User> selectUser();
    int addUser(User user);
    int delete(int id);
}
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.mapper.UserMapper">
    <select id="selectUser" resultType="user">
        select * from mybatis.user;
    </select>
    <insert id="addUser" parameterType="user">
        insert into mybatis.user (id, name, pwd) values
        (#{id}, #{name}, #{pwd})
    </insert>
    <delete id="delete" parameterType="int">
        delete from mybatis.user where id=#{id}
    </delete>
</mapper>
package com.mapper;
import com.pojo.User;
import org.apache.ibatis.session.SqlSession;
import org.mybatis.spring.support.SqlSessionDaoSupport;
import java.util.List;
public class UserMapperIml2 extends SqlSessionDaoSupport implements UserMapper { 
    public List<User> selectUser() { 
        User user = new User(6, "long", "zhi");
        SqlSession sqlSession = getSqlSession();
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        mapper.addUser(user);
        mapper.delete(6);
        return mapper.selectUser();
    }
    public int addUser(User user) { 
        return getSqlSession().getMapper(UserMapper.class).addUser(user);
    }
    public int delete(int id) { 
        return getSqlSession().getMapper(UserMapper.class).delete(id);
    }
}