Hallo全部: 我读过关于这一点的spring参考。Spring @PersistenceContext如何在我的GenericDao中手动注入实体管理器
我会选择在我的DAO中使用@PersistenceContext来注入一个共享的事务性实体管理器,但由于我在两个指向2个不同持久性单元的entityManagerFactories上使用GenericDaoJpaImpl模式,因此我无法使用它。
所以,现在在我的应用我有这样的配置:
entityManagerFactoryies:
<bean id="entityManagerFactoryIban0" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="persistenceXmlLocation" value="classpath:META-INF/contratto-persistence-iban0.xml" />
</bean>
<bean id="entityManagerFactoryCont0" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="persistenceXmlLocation" value="classpath:META-INF/contratto-persistence-cont0.xml" />
</bean>
<bean abstract="true" id="abstractDaoJpaImplIban0" lazy-init="false">
<property name="entityManagerFactory" ref="entityManagerFactoryIban0" />
</bean>
<bean abstract="true" id="abstractDaoJpaImplCont0" lazy-init="false">
<property name="entityManagerFactory" ref="entityManagerFactoryCont0" />
</bean>
然后我的每一个的DAO的是GenericDaoImpl的一个实例:我构建
@Repository
public class GenericDaoJpaImpl<T, ID extends Serializable> implements GenericDao<T, ID> {
private Class<T> entityClass;
private EntityManagerFactory entityManagerFactory;
public void setEntityManagerFactory(EntityManagerFactory entityManagerFactory) {
this.entityManagerFactory = entityManagerFactory;
}
public GenericDaoJpaImpl() {
super();
}
public GenericDaoJpaImpl(Class<T> entityClass) {
super();
this.entityClass = entityClass;
}
/**
* @see it.alten.intesasanpaolo.contratto.dao.common.GenericDao#getItemByID(java.io.Serializable)
*/
@Override
public T getItemByID(ID id) {
EntityManager em = entityManagerFactory.createEntityManager();
return em.find(entityClass, id);
}
我通过这种方式弹簧:
<bean id="eventMessageDao" parent="abstractDaoJpaImplCont0" class="it.alten.intesasanpaolo.contratto.dao.common.GenericDaoJpaImpl">
<constructor-arg>
<value>it.alten.intesasanpaolo.contratto.domain.event.OnlineEventMessage</value>
</constructor-arg>
</bean>
现在我想修改GenericDaoJpaImpl,如在spring文档中所描述的那样,不要关联到entityManagerFactory,我不得不每次创建entityManager而直接关联到entityManager。
我想以一种方式在上下文中定义它,我可以将它注入正确的抽象道,以便从每道道扩展。
<bean abstract="true" id="abstractDaoJpaImplIban0" lazy-init="false">
<property name="entityManagerFactory" ref="entityManagerFactoryIban0" />
</bean>
我该如何做到这一点?
亲切的问候 马西莫