在JPA环境中声明Hibernate事件监听器 [英] Declaring Hibernate event listeners in a JPA environment

问题描述

我们正在开发一个在Java EE 5环境中开发的项目，

我想知道我如何声明一个Hibernate事件监听器，以便在执行CRUD操作时可以被通知。

我已经看到我必须在Hibernate中声明配置文件 * cfg.xml 如下所示：

 < hibernate构型> 
< session-factory> 
 ... 
< event type =load> 
< listener class =com.eg.MyLoadListener/> 
< listener class =org.hibernate.event.def.DefaultLoadEventListener/> 
< / event> 
< / session-factory> 
< / hibernate-configuration> 
  

问题是我在项目中没有这样的文件。我们使用JPA（以Hibernate为底层实现）。你知道我是否需要创建这个特定的文件？如果是，我应该在哪里？

提前感谢。

解决方案

在您的persistence.xml中：

 code><持久性> 
< persistence-unit name =myPersistenceUnit> 
 ... 
< snip /> 
 ... 
< properties> 
< property name =hibernate.ejb.event.loadvalue =com.eg.MyLoadListener，org.hibernate.event.def.DefaultLoadEventListener/> 
< / properties> 
< / persistence-unit> 
< / persistence> 
  

在 Hibernate EntityManager文档查看所有适用属性的表2.1。Hibernate实体管理器特定属性。

Hy guys,

I am working on a project developed in Java EE 5 environment. I want to know how I can declare a Hibernate event listener so that I can be informed when CRUD operation are performed.

I've read that I must declare in the Hibernate configuration file *cfg.xml something like this:

<hibernate-configuration>
    <session-factory>
        ...
        <event type="load">
            <listener class="com.eg.MyLoadListener"/>
            <listener class="org.hibernate.event.def.DefaultLoadEventListener"/>
        </event>
    </session-factory>
</hibernate-configuration>

The problem is I don't have such a file in the project. We are using JPA (with Hibernate as the underlying implementation). Do you know if I need to create that specific file? If yes where should I put it?

Thanks in advance.

解决方案

In your persistence.xml:

<persistence>
    <persistence-unit name="myPersistenceUnit">
        ...
        <snip/>
        ...
        <properties>
            <property name="hibernate.ejb.event.load" value="com.eg.MyLoadListener,org.hibernate.event.def.DefaultLoadEventListener"/>    
        </properties>
    </persistence-unit>
</persistence>

In the Hibernate EntityManager docs look at "Table 2.1. Hibernate Entity Manager specific properties" for all applicable properties.

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