1. Programming Transactions

Concept: Transaction control code is programmed by programmers
Example: OpenSession InView

2. Declarative transactions

1. Concept:
   Transaction control code has been written by spring. Programmers only need to state which methods need transaction control and how to control transactions.
2. Declarative transactions are for methods under the ServiceImpl class
3. Transaction manager based on advice
4. Configuring declarative transactions in spring configuration files
   Transaction Manager
   Declare which methods require transaction management
   Need Cut Point Configuration Based on Notification Writing

<!-- Attribute file-based configuration needs to add this sentence --> 
<context:property-placeholder location="classpath:db.properties,classpath:second.pr operties"/> 
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverMa nagerDataSource"> 
<property name="driverClassName" value="${jdbc.driver}"></property> 
<property name="url" value="${jdbc.url}"></property> 
<property name="username" value="${jdbc.username}"></property> 
<property name="password" value="${jdbc.password}"></property> 
</bean>
<!-- spring-jdbc.jar in --> 
<bean id="txManager" class="org.springframework.jdbc.datasource.DataSour ceTransactionManager"> 
<!-- The transaction manager needs to connect to the data source before it can take effect --> 
<property name="dataSource" ref="dataSource"></property> 
</bean>
<!-- Configuring declarative transactions --> 
<tx:advice id="txAdvice" transaction-manager="txManager"> 
	<tx:attributes>
	<!-- Which methods need transaction control --> 
	<!-- Method to ins Beginning transaction management --> 
	<tx:method name="ins*" /> 
	<tx:method name="del*" /> 
	<tx:method name="upd*" /> 
	<tx:method name="*" /> 
	</tx:attributes> 
</tx:advice>

<!--Collocation points--> 
<aop:config>
<!-- Setting up a wider range of tangent points --> 
<aop:pointcut expression="execution(* com.youdian.service.impl.*.*(..))" id="mypoint" /> 
<aop:advisor advice-ref="txAdvice" pointcut-ref="mypoint" /> 
</aop:config>