spring（AOP事务）

小灰灰 2022-03-22 08:40 154阅读 0赞

> 事务操作

1.  打开事务
2.  提交事务
3.  回滚事务

>  事务操作对象

不同平台操作事务的代码不相同，spring提供了一个接口

PlatformTransactionManager 接口  
    DataSourceTransactionManager  
    HibernateTransitionmanager  
    注意:在spring中，事务管理.最为核心的对象就是TransactionManager对象

例子：银行转账

### AccountServiceImpl.java 实现AccountService接口 ###

public class AccountServiceImpl implements AccountService{
    	private AccountDao ad ;
    	
    	@Override
    	public void transfer(Integer from, Integer to, Double money) {
    		ad.addMoney(from,money);
                    //错误
    		int a = 1/0;
    		ad.loseMoney(to,money);
    	}
    
    	
    	public void setAd(AccountDao ad) {
    		this.ad = ad;
    	}
    
    }

### AccountDaoImpl.java 继承JdbcDaoSupport 实现AccountDao接口 ###

public class AccountDaoImpl extends JdbcDaoSupport implements AccountDao{
    
    	@Override
    	public void addMoney(Integer id, Double money) {
    		String sql = "update t_account set money = money+? where id=?";
    		getJdbcTemplate().update(sql, money,id);
    	}
    
    	@Override
    	public void loseMoney(Integer id, Double money) {
    		String sql = "update t_account set money = money-? where id=?";
    		getJdbcTemplate().update(sql, money,id);
    	}
    
    }

### db.properties ###

jdbc.jdbcUrl=jdbc:mysql:///web_spring
    jdbc.driverClass=com.mysql.jdbc.Driver
    jdbc.user=root
    jdbc.password=admin

## ##

### applicationContext.xml ###

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.2.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.2.xsd ">
    	
    	<context:property-placeholder location="classpath:db.properties"/>
    	
    	
    	<bean name="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager" >
    		
    		<property name="dataSource" ref="dataSource" ></property>
    	</bean>
    	
    	<tx:advice id="txAdvice" transaction-manager="transactionManager">
    		<tx:attributes>
    			
    			<tx:method name="transfer" isolation="REPEATABLE_READ" propagation="REQUIRED" read-only="false"/>
    		</tx:attributes>
    	</tx:advice>
    	
    	
    	<aop:config>
    		
    		<aop:pointcut expression="execution(* spring.tx.*ServiceImpl.*(..))" id="tx"/>
    		
    		
    		<aop:advisor advice-ref="txAdvice" pointcut-ref="tx"/>
    	</aop:config>
    	
    	
    	<bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
    		<property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property>
    		<property name="driverClass" value="${jdbc.driverClass}"></property>
    		<property name="user" value="${jdbc.user}"></property>
    		<property name="password" value="${jdbc.password}"></property>
    	</bean>
    	
    	
    	<bean name="accountDao" class="spring.tx.AccountDaoImpl">
    		<property name="dataSource" ref="dataSource"></property>
    	</bean>
    	
    	<bean name="accountService" class="spring.tx.AccountServiceImpl">
    		<property name="ad" ref="accountDao"></property>
    	</bean>
    </beans>

测试：

@RunWith(SpringJUnit4ClassRunner.class)
    @ContextConfiguration("classpath:applicationContext1.xml")
    public class A_Hello {
    	
    	@Resource(name="accountService")
    	private AccountService as;
    	
    	@Test
    	public void func1(){
    		as.transfer(1, 2, 100d);
    	}
    }