Spring+jpa 怎么配置2个数据库

Question

Spring+jpa 怎么配置2个数据库 进行事物出来。大家帮帮忙吧，谢谢了。有源码的给我参考最好。
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Answer 1

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd"
xmlns:tx="http://www.springframework.org/schema/tx"><bean id="entityManagerFactory"
   class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean">
   <property name="persistenceUnitName" value="mainPU" />
</bean><!-- 第三方数据库 -->
<bean id="entityManagerFactory2"
   class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean">
   <property name="persistenceUnitName" value="eesPU" />
</bean>
<bean id="transactionManager"
   class="org.springframework.orm.jpa.JpaTransactionManager">
   <property name="entityManagerFactory"
    ref="entityManagerFactory" />
</bean><bean id="transactionManager2"
   class="org.springframework.orm.jpa.JpaTransactionManager">
   <property name="entityManagerFactory"
    ref="entityManagerFactory2" />
</bean>
<tx:annotation-driven transaction-manager="transactionManager" />
<tx:annotation-driven transaction-manager="transactionManager2" />
<!-- JPA annotations bean post processor -->
<bean
   class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" />
</beans>