如何开启不同数据库的事务

这篇博客主要是为了解决：当项目中有多个数据库时，如何将多个数据库区分开来，开启一个数据库的事务

在spring的配置文件applicationContext.xml中分别配置2个DataSource, 开启2个事务

<!-- 配置数据源1 -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
      destroy-method="close">
  <property name="driverClass" value="${db.driverClass}"></property>
  <property name="jdbcUrl" value="${db.url}"></property>
  <property name="user" value="${db.username}"></property>
  <property name="password" value="${db.password}"></property>
  <property name="acquireIncrement" value="${db.acquireIncrement}"></property>
  <property name="initialPoolSize" value="${db.initialPoolSize}"></property>
  <property name="maxIdleTime" value="${db.maxIdleTime}"></property>
  <property name="maxPoolSize" value="${db.maxPoolSize}"></property>
  <property name="minPoolSize" value="${db.minPoolSize}"></property>
</bean>

<!-- 开启注解事务和DAO -->
<bean id="tx"
      class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
  <property name="dataSource" ref="dataSource"/>
</bean>
<tx:annotation-driven transaction-manager="tx"/>

<!-- 配置数据源2 -->
<bean id="dataSourcePd" class="com.mchange.v2.c3p0.ComboPooledDataSource"
      destroy-method="close">
  <property name="driverClass" value="${dbPd.driverClass}"></property>
  <property name="jdbcUrl" value="${dbPd.url}"></property>
  <property name="user" value="${dbPd.username}"></property>
  <property name="password" value="${dbPd.password}"></property>
  <property name="acquireIncrement" value="${dbPd.acquireIncrement}"></property>
  <property name="initialPoolSize" value="${dbPd.initialPoolSize}"></property>
  <property name="maxIdleTime" value="${dbPd.maxIdleTime}"></property>
  <property name="maxPoolSize" value="${dbPd.maxPoolSize}"></property>
  <property name="minPoolSize" value="${dbPd.minPoolSize}"></property>
</bean>

<!-- 开启注解事务和DAO -->
<bean id="txDb2"
      class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
  <property name="dataSource" ref="dataSourceDb2"/>
</bean>
<tx:annotation-driven transaction-manager="txDb2"/>

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