事物的ACID原则

原子性

确保事务要么都成功要么都失败

一致性

一旦事务提交，要么成功要么失败

隔离性

多个业务可能操作同一个资源，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，结果都不会再被影响，被持久化的写到存储器中

环境准备

在这里插入图片描述

package com.my.mapper;

import com.my.pojo.User;

import java.util.List;

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

<?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">
<!--核心配置文件-->
<mapper namespace="com.my.mapper.UserMapper">
    <select id="selectUser" resultType="user">
        select * from mybatis.user;
    </select>


</mapper>

package com.my.mapper;

import com.my.pojo.User;
import org.mybatis.spring.support.SqlSessionDaoSupport;

import java.util.List;

public class UserMapperImpl extends SqlSessionDaoSupport implements UserMapper {
    
    


    public List<User> selectUser() {
    
    
       UserMapper mapper =  getSqlSession().getMapper(UserMapper.class);
       return mapper.selectUser();
    }


}

package com.my.pojo;


import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

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

}

<?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
        http://www.springframework.org/schema/aop/spring-aop.xsd">

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

</beans>

<?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">
<!--核心配置文件-->
<configuration>
    <typeAliases>
        <package name="com.my.pojo"/>
    </typeAliases>

</configuration>

<?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
        http://www.springframework.org/schema/aop/spring-aop.xsd">

<!--DataSource使用Spring的数据源替换mybatis的配置
使用Spring'提供的jdbc:org.springframework.jdbc.datasource.DriverManagerDataSource-->
    <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?useUnicode=true&amp;characterEncoding=utf-8&amp;useSSL=false"/>
        <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配置文件-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
        <property name="mapperLocations" value="classpath:com/my/mapper/*.xml"/>
    </bean>

    <!--创建sqlSession-->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
        <!--因为没有set方法，所以只能通过构造器注入sqlSessionFactory-->
        <constructor-arg index="0" ref="sqlSessionFactory"/>
    </bean>



</beans>

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

import java.io.IOException;


public class MyTest {
    
    
    @Test
    public void Test() throws IOException {
    
    
        ApplicationContext context =  new ClassPathXmlApplicationContext("applicationConfig.xml");
       UserMapper userMapper =  context.getBean("userMapper",UserMapper.class);
        for (User user : userMapper.selectUser()) {
    
    
            System.out.println(user);
        }

    }
}