Spring 3.0 的 Google App Engine 实体管理器配置

发布于 2024-12-19 00:35:26 字数 828 浏览 5 评论 0原文

我正在尝试为一些基本的 Google App Engine 服务编写 Spring 配置。特别是对于 EntityManagerFactory 和实体管理器。

从 Java 代码创建 EntityManagerFactory：

EntityManagerFactory emfInstance = javax.persistence.Persistence
    .createEntityManagerFactory("transactions-optional");

我将其翻译为：

<bean id="entityManagerFactory" class="javax.persistence.Persistence" 
    factory-method="createEntityManagerFactory" scope="singleton">
    <constructor-arg value="transactions-optional"/> 
</bean>

每次我需要 EntityManager

EntityManager em = emfInstance.get().createEntityManager();

但我不知道如何告诉将工厂方法应用于之前创建的工厂。

<bean id="entityManagerProto" 
    factory-method="createEntityManager" scope="prototype"/>

有人知道吗？谢谢。

原文

I'm trying to write a Spring configuration for some basic Google App Engine services. In particular for the EntityManagerFactory and Entity Manager.

To create an EntityManagerFactory from Java code:

EntityManagerFactory emfInstance = javax.persistence.Persistence
    .createEntityManagerFactory("transactions-optional");

Which I would translate as:

<bean id="entityManagerFactory" class="javax.persistence.Persistence" 
    factory-method="createEntityManagerFactory" scope="singleton">
    <constructor-arg value="transactions-optional"/> 
</bean>

And every time I need an EntityManager

EntityManager em = emfInstance.get().createEntityManager();

But I don't know how to tell to apply the factory method to the previously created factory.

<bean id="entityManagerProto" 
    factory-method="createEntityManager" scope="prototype"/>

Anyone knows? Thanks.

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北方。的韩爷 2024-12-26 00:35:26

您可以使用现有的 bean 作为工厂，如下所示：

<bean id="entityManagerProto"
    factory-bean = "entityManagerFactory"
    factory-method="createEntityManager" scope="prototype"/>

另外，我不确定它是否适用于 GAE，但也许使用 LocalEntityManagerFactoryBean 代替，并获取EntityManager 注入了 @PersistenceContext。

You can use existing bean as a factory as follows:

<bean id="entityManagerProto"
    factory-bean = "entityManagerFactory"
    factory-method="createEntityManager" scope="prototype"/>

Also, I'm not sure whether it would work on GAE, but perhaps it would be better to use LocalEntityManagerFactoryBean instead, and get EntityManager injected with @PersistenceContext.

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