Java學習路線-61：MyBatis聲明式事務

1、完整配置

（1）beans.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
       http://www.springframework.org/schema/aop/spring-aop.xsd
       http://www.springframework.org/schema/tx
       http://www.springframework.org/schema/tx/spring-tx.xsd
">

    <!-- 配置資料源-->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.cj.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://127.0.0.1:3306/data"/>
        <property name="username" value="root"/>
        <property name="password" value="123456"/>
    </bean>

    <!-- 配置 sqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="configLocation" value="mybatis-config.xml"/>
    </bean>

    <bean id="sqlSessionTemplate" class="org.mybatis.spring.SqlSessionTemplate">
        <constructor-arg index="0" ref="sqlSessionFactory"/>
    </bean>

    <bean id="StudentDao" class="com.pengshiyu.mybatis.dao.impl.StudentDaoImpl">
        <property name="sqlSession" ref="sqlSessionTemplate"/>
    </bean>

    <!--  聲明式事務管理-->
    <!--  配置事務管理器-->
    <bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!-- 配置事務通知-->
    <tx:advice id="txAdvice" transaction-manager="txManager">
        <!-- 配置事務的傳播特性-->
        <tx:attributes>
            <tx:method name="*" propagation="REQUIRED"/>
        </tx:attributes>
    </tx:advice>

    <aop:config>
        <aop:pointcut id="pointcut"
        expression="execution(* com.pengshiyu.mybatis.dao.impl.*.* (..))"/>
        <aop:advisor advice-ref="txAdvice" pointcut-ref="pointcut"/>
    </aop:config>
</beans>
      

（2）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>

    <settings>
        <!-- 列印sql日志 -->
        <setting name="logImpl" value="STDOUT_LOGGING"/>
    </settings>

    <typeAliases>
        <package name="com.pengshiyu.mybatis.entity"/>
    </typeAliases>

    <mappers>
        <mapper resource="StudentMapper.xml"/>
    </mappers>

</configuration>      

（3）StudentMapper.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.pengshiyu.mybatis.entity.StudentMapper">
    <select id="getById" resultType="Student">
        select * from students where id = #{id}
    </select>

    <select id="selectAll" resultType="Student">
        select * from students
    </select>

    <update id="updateById" parameterType="Student">
        update students set age = #{age} where id = #{id}
    </update>

    <delete id="deleteById" parameterType="Student">
        <!-- 故意将sql寫錯，觸發事務管理-->
        deletes from students where id = #{id}
    </delete>

</mapper>      

2、DAO

（1）接口

package com.pengshiyu.mybatis.dao;

import com.pengshiyu.mybatis.entity.Student;

public interface StudentDao {

    public void update(Student studentA, int id);
    public Student getById(int id);

}
      

（2）實作

package com.pengshiyu.mybatis.dao.impl;

import com.pengshiyu.mybatis.dao.StudentDao;
import com.pengshiyu.mybatis.entity.Student;
import org.mybatis.spring.SqlSessionTemplate;

public class StudentDaoImpl implements StudentDao {
    private SqlSessionTemplate sqlSession;

    @Override
    public Student getById(int id) {
        return sqlSession.selectOne("com.pengshiyu.mybatis.entity.StudentMapper.getById", id);
    }

    @Override
    public void update(Student studentA, int id) {
        sqlSession.update("com.pengshiyu.mybatis.entity.StudentMapper.updateById", studentA);
        sqlSession.delete("com.pengshiyu.mybatis.entity.StudentMapper.deleteById", id);
    }

    public void setSqlSession(SqlSessionTemplate sqlSession) {
        this.sqlSession = sqlSession;
    }
}
      

3、測試

package com.pengshiyu.mybatis.test;

import com.pengshiyu.mybatis.dao.StudentDao;
import com.pengshiyu.mybatis.entity.Student;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.io.IOException;

public class Demo {
    public static void main(String[] args) throws IOException {
        ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");

        StudentDao studentDao = (StudentDao) context.getBean("StudentDao");

        Student studentA = studentDao.getById(1);
        studentA.setAge(25);

        studentDao.update(studentA, 3);
    }
}