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>