基于注解的声明式事务控制

1. 编写 AccoutDao

public interface AccountDao {

    public void out(String outMan,double money);
    public void in(String inMan,double money);

}

2. 编写 AccoutService

public interface AccountService {

    public void transfer(String outMan,String inMan,double money);

}

• 事物也可以写在类上，表示类下所有方法都加入了事物，如果类和方法都有事物，就近原则

@Service("accountService")
//@Transactional(isolation = Isolation.READ_COMMITTED, propagation = Propagation.REQUIRED)
public class AccountServiceImpl implements AccountService {

    @Autowired
    private AccountDao accountDao;

    @Transactional(isolation = Isolation.READ_COMMITTED, propagation = Propagation.REQUIRED)
    public void transfer(String outMan, String inMan, double money) {
        accountDao.out(outMan,money);
//        int i = 1/0;
        accountDao.in(inMan,money);
    }

}

3. 配置文件

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

    <!--开启组件扫描-->
    <context:component-scan base-package="com.xdr630.*"/>

    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="com.mysql.jdbc.Driver"/>
        <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/test"/>
        <property name="user" value="root"/>
        <property name="password" value="root"/>
    </bean>

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



    <!--配置平台管理器-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!--事务注解驱动-->
    <tx:annotation-driven transaction-manager="transactionManager"/>
</beans>

4. 测试类

@Repository("accountDao")
public class AccountDaoImpl implements AccountDao {
    @Autowired
    private JdbcTemplate jdbcTemplate;

    public void out(String outMan, double money) {
        jdbcTemplate.update("update account set money=money-? where name=?",money,outMan);
    }

    public void in(String inMan, double money) {
        jdbcTemplate.update("update account set money=money+? where name=?",money,inMan);
    }
}

• 测试：tom 转账 50 给 Lucy

public class AccountController {
    public static void main(String[] args) {
        ApplicationContext app = new ClassPathXmlApplicationContext("applicationContext.xml");
        AccountService accountService = app.getBean(AccountService.class);
        accountService.transfer("tom", "lucy", 50);
    }
}

• 设置异常，开启事务管理
  
  
  

1. 使用 @Transactional 在需要进行事务控制的类或是方法上修饰，注解可用的属性同 xml 配置方式，例如隔离级别、传播行为等。
2. 注解使用在类上，那么该类下的所有方法都使用同一套注解参数配置。
3. 使用在方法上，不同的方法可以采用不同的事务参数配置。
4. xml配置文件中要开启事务的注解驱动<tx:annotation-driven />