Hibernate JPA与H2数据库的连接

我正在开发一个带有JPA的hibernate项目，并试图通过使用H2（嵌入式数据库）获得可工作的persistence.xml

Persistence.xml

<persistence xmlns="http://java.sun.com/xml/ns/persistence"
    version="1.0">

    <persistence-unit name="DefaultPersistenceUnit"
        transaction-type="RESOURCE_LOCAL">

        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <class>entity.user</class>
        <properties>
           <property name="hibernate.connection.url" value="jdbc:h2:/~test" /> -->
            <property name="hibernate.dialect" value="org.hibernate.dialect.H2Dialect"></property>
            <property name="hibernate.connection.driver_class" value="org.h2.Driver" />
            <property name="hibernate.connection.password" value="admin" />
            <property name="hibernate.connection.username" value="admin" />
        </properties>
    </persistence-unit>
</persistence>

---

。有人能给我提供工作persistence.xml吗？

你在使用Spring吗？如果是这样，只要容器不提供EntityManagerFactory，您就可以尝试这种方法

<bean id="entityManagerFactory"
      class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="jpaVendorAdapter">
        <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
            <property name="generateDdl" value="true" />
            <property name="database" value="H2" />
        </bean>
    </property>
    <property name="persistenceUnitName" value="DefaultPersistenceUnit" />
</bean>

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

<bean id="dataSource"
      class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName" value="org.h2.Driver" />
    <property name="url" value="jdbc:h2:database/~test" />
    <property name="username" value="sa" />
    <property name="password" value="" />
</bean>

错误消息是否只说明了这一点？您没有更详细的消息和/或堆栈跟踪吗？你的类真的命名为entity.user吗？你的

hibernate.connection.url

真的

jdbc:h2://~test

<代码>jdbc:h2:文件：~/test；IFEXISTS=TRUE似乎更合理。什么？我更喜欢这种方法，因为它比关闭

persistence.xml

更容易将bean切换到测试或其他配置（web或独立）。

<bean id="entityManagerFactory"
      class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="jpaVendorAdapter">
        <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
            <property name="generateDdl" value="true" />
            <property name="database" value="H2" />
        </bean>
    </property>
    <property name="persistenceUnitName" value="DefaultPersistenceUnit" />
</bean>

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

<bean id="dataSource"
      class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName" value="org.h2.Driver" />
    <property name="url" value="jdbc:h2:database/~test" />
    <property name="username" value="sa" />
    <property name="password" value="" />
</bean>