Spring事务案例有哪些具体应用场景？

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案例准备：

1.导入jar包

注意版本一致性 !-- Spring --> org.springframework spring-context 4.1.3.RELEASE

案例准备:
1.导入jar包
注意版本一致

<!-- Spring -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.1.3.Release</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>4.1.3.Release</version>
</dependency>

<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>4.1.3.Release</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>4.1.3.Release</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-expression</artifactId>
<version>4.1.3.RELEASE</version>
</dependency>

<!-- spring jdbc 相关的包 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.37</version>
</dependency>
<dependency>
<groupId>com.mchange</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.5.2</version>
</dependency>
<!-- 配置的 spring-jdbc -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>4.1.3.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>4.1.3.RELEASE</version>
</dependency>

<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
<version>4.1.3.RELEASE</version>
</dependency>

<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>4.1.3.RELEASE</version>
</dependency>

创建数据库
在springjdbc库中直接创建表

/*Table structure for table `cardinfo` (
` */

CREATE TABLE `cardinfo` (
`id` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,
`username` VARCHAR(20) NOT NULL,
`money` DECIMAL(10,2) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=INNODB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;

/*Data for the table `cardinfo` */

INSERT INTO `cardinfo`(`id`,`username`,`money`) VALUES (1,'Helen','1000.00');
INSERT INTO `cardinfo`(`id`,`username`,`money`) VALUES (2,'Tom','1000.00');

创建dao接口

public interface ICardInfoDao {
/**
* 加钱方法
* @param id
* @param money
*/
void increaseMoney(int id , float money);

/**
* 减钱方法
* @param id
* @param money
*/
void decreaseMoney(int id , float money);
}

创建dao实现类

@Component
public class CardInfoDao implements ICardInfoDao {

@Autowired
private JdbcTemplate jdbcTemplate;

public void increaseMoney(int id , float money) {

jdbcTemplate.update("update cardinfo set money = money + ? where id = ? ;",money,id);

}

public void decreaseMoney(int id , float money) {

jdbcTemplate.update("update cardinfo set money = money - ? where id = ? ;",money,id);
}
}

创建service接口

public interface ICardInfoService {

//转账业务
void transfer(int from , int to , float money);

}

创建service实现类

@Service
public class CardInfoService implements ICardInfoService {
@Autowired
private ICardInfoDao cardInfoDao;

public void transfer(Integer from, Integer to, Double money) {

cardInfoDao.decreaseMoney(from,money);

cardInfoDao.increaseMoney(to,money);
}
}

添加ioc配置文件
先不处理事务问题

注意xmlns的导入

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="www.springframework.org/schema/beans"
xmlns:aop="www.springframework.org/schema/aop"
xmlns:tx="www.springframework.org/schema/tx"
xmlns:xsi="www.w3.org/2001/XMLSchema-instance"
xmlns:context="www.springframework.org/schema/context"
xsi:schemaLocation="www.springframework.org/schema/beans
www.springframework.org/schema/beans/spring-beans-4.0.xsd
www.springframework.org/schema/aop
www.springframework.org/schema/aop/spring-aop-4.0.xsd
www.springframework.org/schema/tx
www.springframework.org/schema/tx/spring-tx-4.0.xsd
www.springframework.org/schema/context
www.springframework.org/schema/context/spring-context-4.0.xsd">



<context:component-scan base-package="com.test"/>
<context:property-placeholder location="db.properties" />

<bean id="comboPooledDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
p:driverClass="${jdbc.driverClass}"
p:jdbcUrl="${jdbc.jdbcUrl}"
p:user="${jdbc.user}"
p:password="${jdbc.password}"
/>

<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="comboPooledDataSource"/>
</bean>

</beans>

测试代码:

ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");

ICardInfoService service = (ICardInfoService) context.getBean("cardInfoService");

service.transfer(1,2,100.0);