在数据库中使用带有 H2 的 Hibernate 时出错

Question

我正在使用 Hibernate。如何将我的 applicationContext.xml 配置为具有 H2 内存数据库org.hibernate.dialect.H2Dialect 不起作用

弹簧配置

   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

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

<bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean" >
    <property name="dataSource" ref="dataSource"></property>
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">org.hibernate.dialect.H2Dialect</prop>
            <prop key="hibernate.hbm2ddl.auto">update</prop>
            <prop key="hibernate.show_sql">true</prop>
            <prop key="hibernate.format_sql">true</prop>
        </props>
    </property>
    <property name="packagesToScan">
        <list>
            <value>com.emusicstore</value>
        </list>
    </property>
</bean>

<bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
    <property name="sessionFactory" ref="sessionFactory" />
</bean>

Answer 1

您没有连接到内存数据库。您的 JDBC URL 用于与 localhost 的网络连接：

jdbc:h2:tcp://localhost/~/test

要使用内存 H2，URL 必须如下所示，包含 mem:

jdbc:h2:mem:testdb

在手册中，见In-Memory Database部分

Answer 2

使用嵌入式 db 数据源（带有 dbcp 连接池）而不是 drivermanager 数据源。

 <jdbc:embedded-database id="dataSource" type="H2">
    <jdbc:script location="classpath:db/sql/create-db.sql" />
    <jdbc:script location="classpath:db/sql/insert-data.sql" />
 </jdbc:embedded-database>

<bean id="dbcpDataSource" class="org.apache.commons.dbcp2.BasicDataSource">
  <property name="driverClassName" value="org.h2.Driver" />
  <property name="url" value="jdbc:hsqldb:mem:dataSource" />
  <property name="username" value="username" />
 <property name="password" value="password" />
</bean>

<bean id="sessionFactory" 
    class="org.springframework.orm.hibernate4.LocalSessionFactoryBean" >
    <property name="dataSource" ref="dbcpDataSource"></property>
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">org.hibernate.dialect.H2Dialect</prop>
            <prop key="hibernate.hbm2ddl.auto">update</prop>
            <prop key="hibernate.show_sql">true</prop>
            <prop key="hibernate.format_sql">true</prop>
        </props>
    </property>
    <property name="packagesToScan">
        <list>
            <value>com.emusicstore</value>
        </list>
    </property>
</bean>

<bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
    <property name="sessionFactory" ref="sessionFactory" />
</bean>