不灭的焱

革命尚未成功,同志仍须努力下载JDK17

作者:php-note.com  发布于:2021-05-28 16:40  分类:Java框架/系统  编辑

这篇文章记录启用注解事务@Transactional配置

一、准备工作

1)引入相关jar包

<dependency>
	<groupId>mysql</groupId>
	<artifactId>mysql-connector-java</artifactId>
	<version>5.1.34</version>
</dependency>
 
<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-jdbc</artifactId>
	<version>${spring.version}</version>
</dependency>
 
<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-tx</artifactId>
	<version>${spring.version}</version>
</dependency>

2)引入相关约束

<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:context="http://www.springframework.org/schema/context" 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/context 
	http://www.springframework.org/schema/context/spring-context.xsd 
	http://www.springframework.org/schema/tx 
	http://www.springframework.org/schema/tx/spring-tx.xsd">
 
</beans>

二、XML配置事务

<?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:aop="http://www.springframework.org/schema/aop"
	xmlns:context="http://www.springframework.org/schema/context" 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/context 
	http://www.springframework.org/schema/context/spring-context.xsd 
	http://www.springframework.org/schema/tx 
	http://www.springframework.org/schema/tx/spring-tx.xsd">
 
 
	<!-- 开启注解扫描 -->
	<context:component-scan base-package="lzgsea.jdbc"></context:component-scan>
 
	<!-- 配置数据源 -->
	<bean id="dataSource"
		class="org.springframework.jdbc.datasource.DriverManagerDataSource">
		<property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
		<property name="url" value="jdbc:mysql://localhost:3306/test"></property>
		<property name="username" value="root"></property>
		<property name="password" value="root"></property>
	</bean>
	
	<!-- JdbcTemplate -->
	<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
		<property name="dataSource" ref="dataSource"></property>
	</bean>
 
	<!--定义事务管理器(声明式的事务) -->
	<bean id="transactionManager"
		class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
		<property name="dataSource" ref="dataSource"></property>
	</bean>
 
	<!-- 开启事务注解@Transactional支持 -->
	<tx:annotation-driven transaction-manager="transactionManager" />
	
</beans>

三、转账案例测事务

1)创建账户表

CREATE TABLE `tb_account` (
  `id` int(11) NOT NULL COMMENT '账号id',
  `name` varchar(10) NOT NULL COMMENT '姓名',
  `money` double NOT NULL DEFAULT '0' COMMENT '金额',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
 
INSERT INTO `tb_account` VALUES (1, '张三', 10000);
INSERT INTO `tb_account` VALUES (2, '李四', 10000);

2)编写AccountService模拟转账

package lzgsea.jdbc;
 
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
 
@Service("accountService")
public class AccountService {
	
	@Autowired
	private JdbcTemplate jdbcTemplate;
	
	@Transactional
	public void transfer() {
		System.out.println("开始转账");
		String sql = "update tb_account set money = money + ? where id = ?";
		jdbcTemplate.update(sql, -1000,1);
		//异常 测试是否回滚
		int i = 1/0;
		jdbcTemplate.update(sql, 1000,2);
		System.out.println("操作完成");
	}
}

3)测试

ApplicationContext act = new ClassPathXmlApplicationContext("transactional.xml");
AccountService accountService = (AccountService) act.getBean("accountService");
accountService.transfer();