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案例：利用Spring的编程式事务管理模拟转账过程
数据库准备
-- 创建表
CREATE TABLE `account`(
`id` INT NOT NULL AUTO_INCREMENT,
`name` VARCHAR(100) NOT NULL,
`money` DOUBLE DEFAULT 0,
PRIMARY KEY (`id`)
)ENGINE = INNODB DEFAULT CHARSET = UTF8;
-- 初始化数据
INSERT INTO account (name, money) VALUES ('张三', 1000);
INSERT INTO account (name, money) VALUES ('李四', 1000);
INSERT INTO account (name, money) VALUES ('王五', 1000);
实例
1.项目结构
2.pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.spring</groupId>
<artifactId>SpringTransaction-001</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>SpringTransaction-001 Maven Webapp</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<spring.verion>4.3.8.RELEASE</spring.verion>
</properties>
<dependencies>
<!-- junit -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<!-- spring-core -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.verion}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>${spring.verion}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.verion}</version>
</dependency>
<!-- spring-dao -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${spring.verion}</version>
</dependency>
<!-- spring-test -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring.verion}</version>
</dependency>
<!-- MySQL -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.42</version>
</dependency>
<!-- C3P0 -->
<dependency>
<groupId>com.mchange</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.5.2</version>
</dependency>
</dependencies>
<build>
<finalName>SpringTransaction-001</finalName>
</build>
</project>
3.jdbc.properties
jdbc.username=root jdbc.password=*** jdbc.driver=com.mysql.jdbc.Driver jdbc.url=jdbc:mysql:///spring_transaction?useSSL=true&characterEncoding=UTF-8
4.AccountDao.java
package org.spring.dao;
/**
* 转账DAO层接口
*/
public interface AccountDao {
/**
* 转出
*
* @param out
* 转出账号
* @param money
* 转出金额
*/
void outMoney(String out, double money);
/**
* 转入
*
* @param in
* 转入账号
* @param money
* 转入金额
*/
void inMoney(String in, double money);
}
5.AccountDaoImpl.java
package org.spring.dao.impl;
import org.spring.dao.AccountDao;
import org.springframework.jdbc.core.support.JdbcDaoSupport;
/**
* 转账DAO层实现类
*
*/
public class AccountDaoImpl extends JdbcDaoSupport implements AccountDao {
// 转出
public void outMoney(String out, double money) {
String sql = "update account set money = money - ? where name = ?";
this.getJdbcTemplate().update(sql, money, out);
}
// 转入
public void inMoney(String in, double money) {
String sql = "update account set money = money + ? where name = ?";
this.getJdbcTemplate().update(sql, money, in);
}
}
6.AccountService.java
package org.spring.service;
/**
* 转账业务层接口
*
*/
public interface AccountService {
/**
* 转账
*
* @param out
* 转出账号
* @param in
* 转入账号
* @param money
* 转账金额
*/
void transfer(String out, String in, Double money);
}
7.AccountServiceImpl.java
package org.spring.service.impl;
import org.spring.dao.AccountDao;
import org.spring.service.AccountService;import org.springframework.transaction.TransactionStatus;
import org.springframework.transaction.support.TransactionCallbackWithoutResult;
import org.springframework.transaction.support.TransactionTemplate;
/**
* 转账业务层实现类
*
*/
public class AccountServiceImpl implements AccountService {
private AccountDao accountDao;
private TransactionTemplate transactionTemplate;
public void setAccountDao(AccountDao accountDao) {
this.accountDao = accountDao;
}
public void setTransactionTemplate(TransactionTemplate transactionTemplate) {
this.transactionTemplate = transactionTemplate;
}
// 转账
public void transfer(final String out, final String in, final Double money) {
transactionTemplate.execute(new TransactionCallbackWithoutResult() {//使用事务进行管理
@Override
protected void doInTransactionWithoutResult(TransactionStatus transactionStatus) {
accountDao.outMoney(out, money);
accountDao.inMoney(in, money);
}
});
}
}
8.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:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<!-- 引入外部的属性文件 -->
<context:property-placeholder location="classpath:jdbc.properties"/>
<!-- 配置C3P0连接池 -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="${jdbc.driver}"/>
<property name="jdbcUrl" value="${jdbc.url}"/>
<property name="user" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
</bean>
<!-- 配置业务层类 -->
<bean id="accountService" class ="org.spring.service.impl.AccountServiceImpl">
<!-- 注入DAO -->
<property name="accountDao" ref="accountDao"/>
<!-- 注入事务管理模板 -->
<property name="transactionTemplate" ref="transactionTemplate"/>
</bean>
<!-- 配置DAO层类 -->
<bean id="accountDao" class="org.spring.dao.impl.AccountDaoImpl">
<!-- 注入连接池 -->
<property name="dataSource" ref="dataSource"/>
</bean>
<!-- 配置事务管理器 -->
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<!-- 注入连接池 -->
<property name="dataSource" ref="dataSource"/>
</bean>
<!-- 配置事务管理的模板：Spring为了简化事务管理的代码而提供的类 -->
<bean id="transactionTemplate" class="org.springframework.transaction.support.TransactionTemplate">
<!-- 注入事务管理器 -->
<property name="transactionManager" ref="transactionManager"/>
</bean>
</beans>
9.TestAccount.java
package org.spring.test;
import javax.annotation.Resource;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.spring.service.AccountService;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class TestAccount {
@Resource(name="accountService")
private AccountService accountService;
@Test
public void testTransfer() {
accountService.transfer("张三", "李四", 100d);
}
}
10.效果预览
10.1 正常执行
10.2 将AccountServiceImpl.java代码修改如下，执行
package org.spring.service.impl;
import org.spring.dao.AccountDao;
import org.spring.service.AccountService;import org.springframework.transaction.TransactionStatus;
import org.springframework.transaction.support.TransactionCallbackWithoutResult;
import org.springframework.transaction.support.TransactionTemplate;
/**
* 转账业务层实现类
*
*/
public class AccountServiceImpl implements AccountService {
private AccountDao accountDao;
private TransactionTemplate transactionTemplate;
public void setAccountDao(AccountDao accountDao) {
this.accountDao = accountDao;
}
public void setTransactionTemplate(TransactionTemplate transactionTemplate) {
this.transactionTemplate = transactionTemplate;
}
// 转账
public void transfer(final String out, final String in, final Double money) {
transactionTemplate.execute(new TransactionCallbackWithoutResult() {//使用事务进行管理
@Override
protected void doInTransactionWithoutResult(TransactionStatus transactionStatus) {
accountDao.outMoney(out, money);
int i = 1 / 0;//手动抛出异常
accountDao.inMoney(in, money);
}
});
}
}
