如何外部化JBOSS 7.1.1的persistence.xml属性？ [英] How to externalize properties of persistence.xml for JBOSS 7.1.1?

问题描述

我的persistence.xml当前存在于应用程序war（位于META-INF文件夹中）。但是，要使应用程序跨多个DB运行，需要一次又一次地更改持久性。我想避免它。但是，我无法理解如何从例如将根据数据库更改的属性文件中配置persistence.xml中的属性（如方言），因此不能强迫我更新和重新部署战争。

My persistence.xml is currently present in the application war(in META-INF folder.). However, for the application to be run across multiple DBs the persistence needs to be changed again and again. I want to avoid it. But, I am not able to understand how will i configure the properties(like dialect) in the persistence.xml from, say, a property file which i would change based on my DB, hence not compelling me to update and redeploy my war.

如果我可以在提到其他数据库详细信息的standalone.xml中的数据源中配置方言，也可以解决我的问题。我无法确定该物业将是什么。
虽然我更喜欢第一个解决方案。

My problem can also be resolved if i can configure the dialect in the datasource in standalone.xml where i have mentioned other DB details. I am not being able to make out what the property would be. Though i would prefer a solution for the first one.

PS：我是Web App开发的新手。问题可能使您烦恼。 ：D

PS: I am rookie in Web App development. Questions might annoy you. :D

推荐答案

我使用了一种适用于休眠状态的方法。

I use a method that works well for hibernate.

1）将休眠配置属性放在xml文件中（称为hibernate.cfg.xml，但这不是强制性的）

1) put the hibernate configuration properties in a xml file (call it hibernate.cfg.xml but it's not mandatory)

这是示例：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>
        <property name="hibernate.dialect">org.hibernate.dialect.PostgreSQLDialect</property>
        <property name="hibernate.hbm2ddl.auto">create-drop</property>
        <property name="hibernate.show_sql">false</property>
        <property name="hibernate.search.default.directory_provider">ram</property>
    </session-factory>
</hibernate-configuration>

您只能在此处放置不以 hibernate.ejb开头的休眠属性

you can put there only hibernate properties that do not start with hibernate.ejb

2）创建一个jboss模块。非常简单假设您要调用模块com.myorganization.config，而不是在服务器安装的 modules 文件夹中创建目录结构：/ com / myorganization / config / main。在主文件夹中放入hibernate.cfg.xml文件和以下 module.xml 文件：

2) Create a jboss module. It's very simple. Suppose you want to call the module com.myorganization.config than create a directory structure in the modules folder of you server installation: /com/myorganization/config/main. In the main folder put the hibernate.cfg.xml file and the following module.xml file:

<?xml version="1.0" encoding="UTF-8"?>  
<module xmlns="urn:jboss:module:1.1" name="com.myorganization.config">  
    <resources>  
        <resource-root path="."/>  
    </resources>
</module>

3）在您的persistence.xml中添加以下属性：

3) In your persistence.xml adding the following property:

<property name="hibernate.ejb.cfgfile" value="/hibernate.cfg.xml" />

4）最后，在META-INF / MANIFEST.MF文件中添加以下行：

4) Finally, in the META-INF/MANIFEST.MF file add the following line:

Dependencies: com.myorganization.config

如果您喜欢maven，请使用maven-war-plugin来更改MANIFEST.MF：

If you like maven use the maven-war-plugin in order to change the MANIFEST.MF:

<configuration>
    <archive>
        <manifestEntries>
            <Dependencies>com.myorganization.config</Dependencies>
        </manifestEntries>
    </archive>
</configuration>

仅此而已。

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