jpa+spring配置多数据源

采用jpa+spring技术配置多数据源

persistence.xml配置多数据源

<?xml version="1.0"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"
    version="1.0">
    <!--配置mysql数据源 -->
    <persistence-unit name="mysql" transaction-type="RESOURCE_LOCAL">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <properties>
            <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect" />
            <property name="hibernate.connection.driver_class" value="org.gjt.mm.mysql.Driver" />
            <property name="hibernate.connection.username" value="root" />
            <property name="hibernate.connection.password" value="mysql" />
            <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/test?useUnicode=true&amp;characterEncoding=UTF-8" />
            <property name="hibernate.hbm2ddl.auto" value="update" />
        </properties>
    </persistence-unit>
    <!--配置oracle数据源 -->
    <persistence-unit name="oracle" transaction-type="RESOURCE_LOCAL">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <properties>
            <property name="hibernate.dialect" value="org.hibernate.dialect.Oracle10gDialect" />
            <property name="hibernate.connection.driver_class" value="oracle.jdbc.driver.OracleDriver" />
            <property name="hibernate.connection.username" value="test" />
            <property name="hibernate.connection.password" value="test" />
            <property name="hibernate.connection.url" value="jdbc:oracle:thin:@localhost:1521:orcl" />
            <property name="hibernate.hbm2ddl.auto" value="update" />
        </properties>
    </persistence-unit>
</persistence>

beans.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:context="http://www.springframework.org/schema/context"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
           http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd
           http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
           http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd">
    
    <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean">
        <property name="persistenceUnitName" value="mysql" />
    </bean>
    <bean id="entityManagerFactory2" class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean">
        <property name="persistenceUnitName" value="oracle" />
    </bean>
    
    <bean id="txManager" class="org.springframework.orm.jpa.JpaTransactionManager">
          <property name="entityManagerFactory" ref="entityManagerFactory"/>
    </bean>
    
    <tx:annotation-driven transaction-manager="txManager" />
</beans>

PersonServiceTest测试类

package junit.test;

import javax.annotation.Resource;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import javax.persistence.PersistenceContext;

import org.junit.Test;
/**
 *  测试多数据源配置是否成功
 *  
 * @author jiqinlin
 *
 */
public class PersonServiceTest  {
    //@PersistenceContext(unitName="mysql")
    //private EntityManager mysqlEm;
    //@PersistenceContext(unitName="oracle")
    //private EntityManager oracleEm;
    
    @Test
    public void test() {
        EntityManagerFactory mysql = Persistence.createEntityManagerFactory("mysql");
        EntityManagerFactory oracle = Persistence.createEntityManagerFactory("oracle");
        System.out.println(mysql + " : " + oracle);
        
    }
}

运行时如果能打印出factory对象，表示多数据源配置成功，如下所示