Spring3.2.1+Hibernate4.1.7 多数据源动态切换

             公司项目最近在整改,之前用spring jdbc 的数据链接现在要改成Hibernate,因为之前很少接触hibernate遇到的第一个问题就给难住了,配置多个SessionFactory显然是不符合规范 所以就想用Spring的多数据配置,在网上搜了很多资料所以记下来：

applicationContext-db.xml

<?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-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd http://www.springframework.org/schema/aop  http://www.springframework.org/schema/aop/spring-aop-3.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd">
<bean id="vids_bill_dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
destroy-method="close">
<property name="driverClass" value="${bill.jdbc.driverClass}" />
<property name="jdbcUrl" value="${bill.jdbc.url}" />
<property name="user" value="${bill.jdbc.username}" />
<property name="password" value="${bill.jdbc.password}" />
<property name="maxPoolSize" value="${bill.jdbc.maxPoolSize}" />

<property name="minPoolSize" value="${c3p0.minPoolSize}" />
<property name="autoCommitOnClose" value="${c3p0.autoCommitOnClose}" />
<property name="checkoutTimeout" value="${c3p0.checkoutTimeout}" />
<property name="initialPoolSize" value="${c3p0.minPoolSize}" />
<property name="maxIdleTime" value="${c3p0.maxIdleTime}" />
<property name="acquireIncrement" value="${c3p0.acquireIncrement}" />
<property name="maxIdleTimeExcessConnections" value="${c3p0.maxIdleTimeExcessConnections}" />
<property name="maxStatements" value="0" />
<property name="maxStatementsPerConnection" value="0" />

</bean>

<bean id="vids_bind_dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
destroy-method="close">
<property name="driverClass" value="${bind.jdbc.driverClass}" />
<property name="jdbcUrl" value="${bind.jdbc.url}" />
<property name="user" value="${bind.jdbc.username}" />
<property name="password" value="${bind.jdbc.password}" />
<property name="maxPoolSize" value="${bind.jdbc.maxPoolSize}" />

<property name="minPoolSize" value="${c3p0.minPoolSize}" />
<property name="autoCommitOnClose" value="${c3p0.autoCommitOnClose}" />
<property name="checkoutTimeout" value="${c3p0.checkoutTimeout}" />
<property name="initialPoolSize" value="${c3p0.minPoolSize}" />
<property name="maxIdleTime" value="${c3p0.maxIdleTime}" />
<property name="acquireIncrement" value="${c3p0.acquireIncrement}" />
<property name="maxIdleTimeExcessConnections" value="${c3p0.maxIdleTimeExcessConnections}" />
<property name="maxStatements" value="0" />
<property name="maxStatementsPerConnection" value="0" />

</bean>

    <bean id="dynamicDataSource" class="cn.com.hintsoft.configuration.DynamicDataSource">  

       <property name="targetDataSources">  

           <map key-type="java.lang.String">  

               <entry value-ref="vids_bill_dataSource" key="vids_bill_dataSource"></entry>  

               <entry value-ref="vids_bind_dataSource" key="vids_bind_dataSource"></entry>  

           </map>  

       </property>  

       <property name="defaultTargetDataSource" ref="vids_bind_dataSource"></property>  

   </bean>  

 

   <bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">  

       <property name="dataSource" ref="dynamicDataSource" />  

       <property name="hibernateProperties">  

           <props>  

               <prop key="hibernate.dialect">${hibernate.dialect}</prop>  

               <prop key="hibernate.current_session_context_class">org.springframework.orm.hibernate4.SpringSessionContext</prop>  

               <prop key="hibernate.show_sql">true</prop>  

               <prop key="hibernate.format_sql">true</prop>  

               <prop key="hibernate.hbm2ddl.auto">${hibernate.hbm2ddl.auto}</prop>  

           </props>  

       </property>  

       <property name="packagesToScan">  

           <list>  

               <value>cn.com.hintsoft.smsmanage.common.domain.*</value>  

           </list>  

       </property>  

   </bean>  

 

   <bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">  

       <property name="sessionFactory" ref="sessionFactory" />  

   </bean>  

  <!-- 一定要注意事物的切入点:事物配置在哪一层数据切换的代码就写在那一层 -->

   <aop:config>  

       <aop:pointcut id="transactionPointCut" expression="execution(* cn.com.hintsoft.smsmanage.*.services.impl.*.*(..))" />  

       <aop:advisor advice-ref="txAdvice" pointcut-ref="transactionPointCut" />  

   </aop:config>  

 

   <tx:advice id="txAdvice" transaction-manager="transactionManager">  

       <tx:attributes>  

           <tx:method name="add*" propagation="REQUIRED" />  

           <tx:method name="save*" propagation="REQUIRED" />  

           <tx:method name="update*" propagation="REQUIRED" />  

           <tx:method name="delete*" propagation="REQUIRED" />  

           <tx:method name="*" read-only="true" />  

       </tx:attributes>  

   </tx:advice>  

 

 <bean name = "basicDao" class = "cn.com.hintsoft.configuration.BasicDao" >

  <property name="sessionFactory" ref="sessionFactory"></property>

 </bean>

</beans>

DatabaseLocalHandler.java 

public class DatabaseLocalHandler {  

    private static final ThreadLocal<String> handler= new ThreadLocal<String>();  

  

    public static void setCustomerType(String customerType) {  

        handler.set(customerType);  

    }  

  

    public static String getCustomerType() {  

        return handler.get();

    }  

  

    public static void clearCustomerType() {  

        handler.remove();  

    }  

}  

DataSourceMap.java 常量存放

public class DataSourceMap {

public static final String VIDS_BILL_DATASOURCE = "vids_bill_dataSource";

public static final String VIDS_BIND_DATASOURCE = "vids_bind_dataSource";

}
<
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/p>

DynamicDataSource.java 用于数据切换的类 继承了AbstractRoutingDataSource 这个类的源代码网上很多人都做了分析 有兴趣可以去查一下

public class DynamicDataSource extends AbstractRoutingDataSource{  
 

    @Override  

    protected Object determineCurrentLookupKey() {  

        return DatabaseLocalHandler.getCustomerType();   

    }  

  

}  

TestServiceImpl.java 演示  

@Service

public class TestServiceImpl implements TestService{

@Resource
TestDao testDao;

public void save(Object obj){
testDao.save(obj);
}

public void query(){
DatabaseLocalHandler.setCustomerType(DataSourceMap.VIDS_BILL_DATASOURCE); //注意这个位置代码的存放，事物必须配置到这个层 否则无法切换
testDao.query();

DatabaseLocalHandler.setCustomerType(DataSourceMap.VIDS_BIND_DATASOURCE); //切换到另一个数据库
testDao.query();
}

}

dao层的代码的话就不列举了，杂文一篇完成^.^