如何将外部文件的属性包含到hibernate.cfg.xml中？ [英] How to include properties from external file to hibernate.cfg.xml?

问题描述

我需要能够将数据库配置属性存储在 src | main | java | dbConnection.properties 中，并将其包含到 hibernate.cfg中。 xml ，其格式为 jstl 表达式。 （如：$ {密码}等）。如何做到这一点？

I need to be able to store database config properties in src|main|java|dbConnection.properties and include it to hibernate.cfg.xml in form of jstl expressions. (like : ${password} etc.). How to do it?

目前的hibernate.cfg.xml：

Current hibernate.cfg.xml:

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD//EN"
        "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>
<property name="connection.driver_class">org.postgresql.Driver</property>
        <property name="connection.username">postgres</property>
        <property name="connection.password">postgres</property>
        <property name="transaction.factory_class">org.hibernate.transaction.JDBCTransactionFactory</property>
    </session-factory>
</hibernate-configuration>

我需要这样的东西：

I need something like this:

<?xml version='1.0' encoding='utf-8'?>
    <!DOCTYPE hibernate-configuration PUBLIC
            "-//Hibernate/Hibernate Configuration DTD//EN"
            "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
    <hibernate-configuration>
        <session-factory>
    <property name="connection.driver_class">${DRIVER}</property>
            <property name="connection.username">${USERNAME}</property>
            <property name="connection.password">${PASSWORD}</property>
            <property name="transaction.factory_class">org.hibernate.transaction.JDBCTransactionFactory</property>
        </session-factory>
    </hibernate-configuration>

推荐答案

您声明您使用Spring，那么为什么不让Spring尽一切努力。让一个属性占位符替换你想要的占位符。

You state that you use Spring then why not let Spring do all the hard work. Let a property placeholder replace the placeholders you want.

<context:property-placeholder location="classpath:dbConnection.properties" />

<bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
    <property name="hibernateProperties">
       <map>
            <entry key="connection.driver_class" value="${DRIVER}" />
            <entry key="connection.username" value="${USERNAME}" />
            <entry key="connection.password" value="${PASSWORD}" />
            <entry key="transaction.factory_class" value="org.hibernate.transaction.JDBCTransactionFactory" />
        </map>
    <property>
 </bean>

免费的建议，而不是使用内部hibernate连接的东西（这不建议在生产中使用）在spring中配置一个数据源并将它连接到你的 LocalSessionFactoryBean

Free advice instead of using the internal hibernate connection stuff (which isn't adviced to be used in production) configure a datasource in spring and wire that to your LocalSessionFactoryBean

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