spring【6】（事物创建代理 BeanNameAutoProxyCreator)

<span style="font-size:18px;">public int delete(int sID) {
　 dbc = new DataBaseConnection();
　 Connection con = dbc.getConnection();
　 try {
　　 con.setAutoCommit(false);// 更改JDBC事务的默认提交方式
　　 dbc.executeUpdate("delete from xiao where ID=" + sID);
　　 dbc.executeUpdate("delete from xiao_content where ID=" + sID);
　　 dbc.executeUpdate("delete from xiao_affix where bylawid=" + sID);
　　 con.commit();//提交JDBC事务
　　 con.setAutoCommit(true);// 恢复JDBC事务的默认提交方式
　　 dbc.close();
　　 return 1;
　 }
　 catch (Exception exc) {
　　 con.rollBack();//回滚JDBC事务
　　 exc.printStackTrace();
　　 dbc.close();
　　 return -1;
　 }
} </span>

可以看到传统的java事务处理需要编写繁琐的JDBC代码，而基于springAOP的声明式事务让程序员告别JDBC事务代码

<span style="font-size:18px;">
<bean class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator">
<property name="beanNames">
<list>
<value>*Mgr</value>//事务处理应该做在事务层，详见spring【7】
<value>*Service</value>
</list>
</property>
<property name="interceptorNames">
<list>
<value>transactionInterceptor</value>
</list>
</property>
</bean></span>

BeanNameAutoProxyCreator是个根据bean名生成自动代理的代理创建器，该bean通常需要接受两个参数。第一个是beanNames属性，该属性用来设置哪些bean需要自动生成代理。另一个属性是interceptorNames，该属性则指定事务拦截器，自动创建事务代理时，系统会根据这些事务拦截器的属性来生成对应的事务代理。

beanNames:bean列表，这些bean会自动创建事务代理

interceptorNames:拦截器列表

<span style="font-size:18px;"><!-- add interceptor defined in  BeanNameAutoProxyCreator-->
<bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations">
<list>
<value>classpath:jdbc.properties</value>
</list>
</property>
</bean>

<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
<property name="driverClass">
<value>${jdbc.driverClassName}</value>
</property>
<property name="jdbcUrl">
<value>${jdbc.url}</value>
</property>
<property name="user">
<value>${jdbc.username}</value>
</property>
<property name="password">
<value>${jdbc.password}</value>
</property>
<property name="minPoolSize">
<value>5</value>
</property>
<property name="maxPoolSize">
<value>30</value>
</property>
<property name="initialPoolSize">
<value>10</value>
</property>
<property name="idleConnectionTestPeriod">
<value>60</value>
</property>
<property name="maxIdleTime">
<value>60</value>
</property>
<property name="acquireIncrement">
<value>5</value>
</property>
<property name="maxStatements">
<value>0</value>
</property>
<property name="checkoutTimeout">
<value>1000</value>
</property>
<property name="acquireRetryAttempts">
<value>30</value>
</property>
<property name="breakAfterAcquireFailure">
<value>true</value>
</property>
</bean>

<bean id="sessionFactory" class="org.springframework.orm.hibernate5.LocalSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="hibernateProperties">
<props>
<!--<prop key="hibernate.hbm2ddl.auto">update</prop>-->
<prop key="hibernate.dialect">${hibernate.dialect}</prop>
<prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
<prop key="hibernate.format_sql">${hibernate.format_sql}</prop>
<prop key="hibernate.enable_lazy_load_no_trans">${hibernate.enable_lazy_load_no_trans}</prop>
</props>
</property>
</bean>

<bean id="baseDao" abstract="true">
<property name="sessionFactory">
<ref local="sessionFactory"/>
</property>
</bean>

<bean id="transactionManager"
class="org.springframework.orm.hibernate5.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory"></property>
</bean>

<bean id="transactionInterceptor"
class="org.springframework.transaction.interceptor.TransactionInterceptor">
<property name="transactionManager" ref="transactionManager"/>
<property name="transactionAttributes">
<props>
<!--<prop key="query*">PROPAGATION_REQUIRED,readOnly</prop>-->
<!--<prop key="is*">PROPAGATION_REQUIRED,readOnly</prop>-->
<!--<prop key="find*">PROPAGATION_REQUIRED,readOnly</prop>-->
<!--<prop key="get*">PROPAGATION_REQUIRED,readOnly</prop>-->
<!--<prop key="can*">PROPAGATION_REQUIRED,readOnly</prop>-->
<!--<prop key="load*">PROPAGATION_REQUIRED,readOnly</prop>-->
<prop key="*">PROPAGATION_REQUIRED</prop>
</props>
</property>
</bean></span>