Spring-事务声明

1，保证了四个原则

UserMapper

package com.miao.mapper;

import com.miao.pojo.User;

import java.util.List;

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

    public int addUser(User user);

    public int deleteUser(int id);
}

UserMapperImpl.java

package com.miao.mapper;

import com.miao.pojo.User;
import org.mybatis.spring.SqlSessionTemplate;

import java.util.List;

//第一种Spring操作mybatis的方式
public class UserMapperImpl implements UserMapper{

    //之前操作mybatis都使用sqlSession，现在都使用sqlSessiontemplate

    private SqlSessionTemplate sqlSessionTemplate;
    public void setSqlSessionTemplate(SqlSessionTemplate sqlSessionTemplate)
    {
        this.sqlSessionTemplate=sqlSessionTemplate;
    }

    public List<User> selectUser() {
        User user=new User(6,"苗可卓6","15351");
        UserMapper mapper = sqlSessionTemplate.getMapper(UserMapper.class);
        mapper.addUser(user);
        mapper.deleteUser(6);

        return mapper.selectUser();
    }

    public int addUser(User user) {

        return sqlSessionTemplate.getMapper(UserMapper.class).addUser(user);
    }

    public int deleteUser(int id) {
        return sqlSessionTemplate.getMapper(UserMapper.class).deleteUser(id);
    }
}

UserMapper.xml

<?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.miao.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="deleteUser" parameterType="int">
        delete from mybatis.user where id=#{id}
    </delete>


</mapper>

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
        https://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"/>

    <!--方式一：重点理解这步-->
    <bean id="userMapper" class="com.miao.mapper.UserMapperImpl">
        <property name="sqlSessionTemplate" ref="sqlSessionTemplate"/>
    </bean>


    <!--方式二，此处直接使用sqlSessionFactory，跳过了sqlSessionTemplate这步-->
  <!--  <bean id="userMapper2" class="com.miao.mapper.UserMapperImpl2">
        <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
    </bean>-->

</beans>

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>
    <!--这些标签的引入还需要注意顺序-->






    <!--别名   简化代码-->
    <typeAliases>
        <package name="com.miao.pojo"/>
    </typeAliases>




    <!--此处的绑定接口会与spring中的   <property name="mapperLocations" value="classpath:com/miao/mapper/*.xml"/>    冲突-->
    <!--绑定接口-->
    <!--<mappers>
        <package name="com/miao/mapper"/>
    </mappers>-->

</configuration>

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
        https://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
">



    <!--DataSources: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.cj.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useUnicode=true&amp;characterEncoding=utf-8&amp;zeroDateTimeBehavior=convertToNull&amp;serverTimezone=UTC"/>
        <property name="username" value="root"/>
        <property name="password" value="123456"/>
    </bean>

    <!--SqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <!--绑定mybatis-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
        <property name="mapperLocations" value="classpath:com/miao/mapper/*.xml"/>
    </bean>

    <!--SqlSessionTemplate是我们使用的sqlSession-->
    <bean id="sqlSessionTemplate" class="org.mybatis.spring.SqlSessionTemplate">
        <!--只能用构造器注入sqlSession,因为他没有sqlSession-->
        <constructor-arg index="0" ref="sqlSessionFactory"/>
    </bean>




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


    <!--该配置保持了四个原则，原子，一致，隔离，。。。。-->
    <!--结合AOP实现事务的织入-->
    <!--配置事务的类-->

    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <!--给方法配置事务-->
        <!--配置事务传播特性-->
        <tx:attributes>
            <tx:method name="add" propagation="REQUIRED"/>
            <tx:method name="delete" propagation="REQUIRED"/>
            <tx:method name="*" propagation="REQUIRED"/>
        </tx:attributes>
    </tx:advice>

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

</beans>

spring-dao.xml是事务配置的重点，包括四个原则性的方法，自动回滚等

test.java

import com.miao.mapper.UserMapper;
import com.miao.pojo.User;
import org.junit.Test;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.util.List;

public class test {
    @Test
    public void test1()
    {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        UserMapper userMapper = context.getBean("userMapper",UserMapper.class);
        List<User> userList = userMapper.selectUser();
        for (User user : userList)
        {
            System.out.println(user);
        }
    }
    @Test
    public void test2()
    {

    }
}