从Spring中更改hibernate.connection.url

Question

我正在将Hibernate与Spring结合使用.作为数据库,我目前正在使用HSQL,它将数据存储在一个文件中(如SQLite).HSQL文件的路径目前在persistence.xml中进行了硬编码.如何在运行时访问和更改此值,以便用户可以从/向任意HSQL文件加载和保存？

persistence.xml中:

<persistence xmlns="http://java.sun.com/xml/ns/persistence"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://java.sun.com/xml/ns/persistence
                                 http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"
             version="1.0">

    <persistence-unit name="something-unit">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>

        <properties>
            <property name="hibernate.connection.driver_class" value="org.hsqldb.jdbcDriver" />
            <property name="hibernate.connection.url" value="jdbc:hsqldb:file:~/something-db/somethingdb" />
            <property name="hibernate.connection.username" value="sa" />
            <property name="hibernate.dialect" value="org.hibernate.dialect.HSQLDialect" />
            <property name="hibernate.hbm2ddl.auto" value="update" />
        </properties>
    </persistence-unit>

</persistence>

Spring applicationContext.xml

<?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:context="http://www.springframework.org/schema/context"
       xmlns:data="http://www.springframework.org/schema/data/jpa"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="
               http://www.springframework.org/schema/beans
               http://www.springframework.org/schema/beans/spring-beans.xsd
               http://www.springframework.org/schema/context
               http://www.springframework.org/schema/context/spring-context-2.5.xsd
               http://www.springframework.org/schema/data/jpa
               http://www.springframework.org/schema/data/jpa/spring-jpa.xsd
               http://www.springframework.org/schema/tx
               http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">


    <!-- Database Setup -->

    <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean">
        <property name="persistenceUnitName" value="something-unit" />
    </bean>

    <data:repositories base-package="com.something.playlist"/>

    <!-- Transaction Setup -->

    <tx:annotation-driven/>

    <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="entityManagerFactory"/>
    </bean>

</beans>

谢谢你的提示!

Answer 1

您可以指定 JNDI 数据源并将其传递给 Hibernate。或者您可以通过实现接口 org.hibernate.connection.ConnectionProvider 来定义自己的插件策略来获取 JDBC 连接

有关更多提示，请参阅：http://docs.jboss.org/hibernate/orm/3.3/reference/en/html/session-configuration.html

编辑2/16： StackOverflow上有一个关于创建自定义ConnectionProvider的示例：How can I set Datasource when I'm create Hibernate SessionFactory?

如果您要动态更改数据源，而不是在启动时更改，则必须重新启动 Hibernate 会话工厂。要正确执行此操作，您必须确保重新启动时其中没有任何事务正在运行。以下问题/答案将帮助您：Hibernate Sessionfactory restart | Hibernate Sessionfactory restart | Hibernate Sessionfactory restart | Hibernate Sessionfactory restart | Hibernate Sessionfactory restart 春天