Spring JPA Hibernate，具有更多数据源

如果您想使用多个

DataSource

Spring + JPA

1. 创建两个或更多的

   PersistenceUnit

   在

   persistence.xml

   。
2. 创建

   EntityManagerFactory

   每个

   PersistenceUnit

   在

   spring-beans.xml

   。

在您的DAO类中。

@PersistenceContext(unitName ="JPA_1")private EntityManager em_1;@PersistenceContext(unitName ="JPA_2")private EntityManager em_2;

Conig persistence.xml

<persistence-unit name="JPA_1" type="RESOURCE_LOCAL">....</persistence-unit><persistence-unit name="JPA_2" type="RESOURCE_LOCAL">....</persistence-unit>

配置：spring-beans.xml

<bean id="entityManagerFactory1" >    <property name="persistenceUnitName" value="JPA_1"/>    <property name="jpaVendorAdapter" ref="jpaVendorAdapter"/>    <property name="jpaDialect">        <bean /> <--if it is necessary, replace with hibernate.    </property>    <property name="jpaPropertyMap">        <props> <prop key="eclipselink.weaving">false</prop> <--if it is necessary, replace with hibernate.        </props>    </property>    <property name="loadTimeWeaver">        <bean >        </bean>    </property></bean><bean id="entityManagerFactory2" >    <property name="persistenceUnitName" value="JPA_2"/>    <property name="jpaVendorAdapter" ref="jpaVendorAdapter"/>    <property name="jpaDialect">        <bean /> <--if it is necessary, replace with hibernate.    </property>    <property name="jpaPropertyMap">        <props> <prop key="eclipselink.weaving">false</prop> <--if it is necessary, replace with hibernate.        </props>    </property>    <property name="loadTimeWeaver">        <bean >        </bean>    </property></bean><bean id="jpaVendorAdapter" > <--if it is necessary, replace with hibernate.    <property name="databasePlatform" value="org.eclipse.persistence.platform.database.MySQLPlatform"/>    <!--<property name="databasePlatform" value="org.eclipse.persistence.platform.database.OraclePlatform" />-->    <property name="generateDdl" value="false"/>    <property name="showSql" value="true"/></bean>