Spring学习（九）——声明式事务

墨蓝 2023-01-05 12:06 141阅读 0赞

### 声明式事务 ###

*  事物的ACID原则
 *  环境准备
 *  模拟事务
 *   *  spring中的事务管理
     *   *  声明式事务
         *  编程式事务

在不改变原有的代码的基础上实现事务

# 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][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoYXJfbQ_size_16_color_FFFFFF_t_70]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoYXJfbQ_size_16_color_FFFFFF_t_70 1]

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">
    
    <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" ?>
    <!DOCTYPE configuration
            PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
            "http://mybatis.org/dtd/mybatis-3-config.dtd">
    
    <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">
    
    
        <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&characterEncoding=utf-8&useSSL=false"/>
            <property name="username" value="root"/>
            <property name="password" value="123456"/>
        </bean>
    
    
        <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
            <property name="dataSource" ref="dataSource" />
            
            <property name="configLocation" value="classpath:mybatis-config.xml"/>
            <property name="mapperLocations" value="classpath:com/my/mapper/*.xml"/>
        </bean>
    
        
        <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
            
            <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);
            }
    
        }
    }

![在这里插入图片描述][20210112125302813.png]

# 模拟事务 #

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoYXJfbQ_size_16_color_FFFFFF_t_70 2]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoYXJfbQ_size_16_color_FFFFFF_t_70 3]

![在这里插入图片描述][20210112135825530.png]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoYXJfbQ_size_16_color_FFFFFF_t_70 4]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoYXJfbQ_size_16_color_FFFFFF_t_70 5]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoYXJfbQ_size_16_color_FFFFFF_t_70 6]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoYXJfbQ_size_16_color_FFFFFF_t_70 7]

## spring中的事务管理 ##

### 声明式事务 ###

AOP

### 编程式事务 ###

需要在代码中进行事务的管理，有些麻烦

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[20210112125302813.png]: https://img-blog.csdnimg.cn/20210112125302813.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoYXJfbQ_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20210112134717260.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoYXJfbQ==,size_16,color_FFFFFF,t_70
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[20210112135825530.png]: https://img-blog.csdnimg.cn/20210112135825530.png
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