我正在设置一个 maven-spring-hibernate-mysql-tomcat 环境。
我想使用 @PersistenceContext 注释注入我的实体管理器。据我所知，我应该在我的应用程序上下文中定义 PersistenceAnnotationBeanPostProcessor，指向我的 persistence.xml 文件。
在这种情况下，我的应用程序上下文可能或多或少是这样的：
<?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:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
xmlns:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:task="http://www.springframework.org/schema/task" xmlns:ox="http://www.springframework.org/schema/oxm"
xsi:schemaLocation="
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd
http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.1.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd
http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.1.xsd
http://www.springframework.org/schema/oxm http://www.springframework.org/schema/oxm/spring-oxm-3.1.xsd
http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-3.1.xsd">
<!-- Root Context: defines shared resources visible to all other web components -->
<!-- Context -->
<context:component-scan base-package="com.yl.mypack" />
<!-- AOP -->
<aop:aspectj-autoproxy />
<!-- Properties -->
<context:property-placeholder
location="classpath:db.connection.properties,applicationProperties.properties" />
<!-- DB Connection Pool -->
<bean id="dataSourceGlobal" class="com.mchange.v2.c3p0.ComboPooledDataSource"
destroy-method="close">
<!-- Data Source -->
<property name="driverClass" value="${driverClass}" />
<property name="jdbcUrl" value="${jdbcUrl}" />
<property name="user" value="${user}" />
<property name="password" value="${password}" />
<!-- C3P0 Connection pool properties -->
<property name="minPoolSize" value="${c3p0.min_pool_size}" />
<property name="maxPoolSize" value="${c3p0.max_pool_size}" />
<property name="unreturnedConnectionTimeout" value="${c3p0.timeout}" />
<property name="idleConnectionTestPeriod" value="${c3p0.idle_test_period}" />
<property name="maxStatements" value="${c3p0.max_statements}" />
<property name="automaticTestTable" value="${c3p0.automatic_test_table}" />
</bean>
<!-- JPA -->
<!-- Creates a EntityManagerFactory for use with the Hibernate JPA provider -->
<bean id="entityManagerFactory"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="persistenceXmlLocation" value="classpath:META-INF/persistence.xml"/>
<property name="persistenceUnitName" value="myPU" />
<property name="dataSource" ref="dataSourceGlobal" />
</bean>
<!-- In order to enable EntityManager injection -->
<bean id="persistenceAnnotation"
class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor">
<property name="persistenceUnits">
<map>
<entry key="myPU" value="classpath:META-INF/persistence.xml" />
</map>
</property>
</bean>
<!-- Transactions -->
<tx:annotation-driven />
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory" />
<property name="dataSource" ref="dataSourceGlobal" />
</bean>
</beans>
我的 persistence.xml 可能如下所示：
<persistence-unit name="myPU" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<properties>
<property name="hibernate.transaction.flush_before_completion"
value="true" />
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQLInnoDBDialect" />
<property name="hibernate.show_sql" value="true" />
</properties>
</persistence-unit>
所以现在我想我应该能够使用 @PersistenceContext 注释注入我的实体管理器，在列表中这是我从文档中得到的。在我进入 JpaVendorAdapter 之前，我的第一个问题是实体管理器工厂定义：以下属性：
<property name="persistenceXmlLocation" value="classpath:META-INF/persistence.xml"/>
<property name="persistenceUnitName" value="myPU" />
这些是否需要从实体管理器工厂转介？这是必须的吗？
我的第二个问题是关于 JpaVendorAdapter，在我的例子中是HibernateJpaVendorAdapter。
如果我使用 HibernateJpaVendorAdapter，我还需要一个 persistence.xml 文件吗？由于某些属性是重叠的。此外，我还需要定义 PersistenceAnnotationBeanPostProcessor，指向我的 persistence.xml 文件吗？这两个可以一起使用吗（PersistenceAnnotationBeanPostProcessor 和 HibernateJpaVendorAdapter）？他们应该一起去吗？假设我避免使用任何 JDNI 样式定义，最佳实践是什么？
提前致谢