Question

我正在尝试将spring环境设置为在内存数据库中运行，该数据库是根据提供的映射自动创建的。在执行期间，我可以在日志中看到执行DDL语句，但是当hibernate尝试将数据插入到已创建的表中时，我收到“找不到表”的例外。

可能有什么问题？

使用spring 3.1.1和Hibernate 4.1.1和H2版本1.3.165。

日志看起来像（只剩下令人遗憾的记录）：

INFO at '25-04-2012 13:23:56.318' by thread 'main' from category 'org.hibernate.tool.hbm2ddl.SchemaExport':
HHH000227: Running hbm2ddl schema export
DEBUG at '25-04-2012 13:23:56.318' by thread 'main' from category 'org.hibernate.SQL':

    drop table DUMMIES if exists
Hibernate: 
    drop table DUMMIES if exists
DEBUG at '25-04-2012 13:23:56.318' by thread 'main' from category 'org.hibernate.SQL':

    create table DUMMIES (
        id bigint generated by default as identity,
        title varchar(255),
        primary key (id),
        unique (title)
    )
Hibernate: 
    create table DUMMIES (
        id bigint generated by default as identity,
        title varchar(255),
        primary key (id),
        unique (title)
    )
INFO at '25-04-2012 13:23:56.334' by thread 'main' from category 'org.hibernate.tool.hbm2ddl.SchemaExport':
HHH000230: Schema export complete
INFO at '25-04-2012 13:23:56.334' by thread 'main' from category 'org.springframework.context.support.ClassPathXmlApplicationContext':
Bean 'mySessionFactory' of type [class org.springframework.orm.hibernate4.LocalSessionFactoryBean] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
INFO at '25-04-2012 13:23:56.631' by thread 'main' from category 'org.springframework.orm.hibernate4.HibernateTransactionManager':
Using DataSource [org.springframework.jdbc.datasource.SimpleDriverDataSource@a86d12] of Hibernate SessionFactory for HibernateTransactionManager
WARN at '25-04-2012 13:23:56.865' by thread 'main' from category 'org.hibernate.engine.jdbc.spi.SqlExceptionHelper':
SQL Error: 42102, SQLState: 42S02
ERROR at '25-04-2012 13:23:56.865' by thread 'main' from category 'org.hibernate.engine.jdbc.spi.SqlExceptionHelper':
Table "DUMMIES" not found; SQL statement:
insert into DUMMIES (id, title) values (null, ?) [42102-165]

Beans.xml看起来像（'mypackage'是完整包名的替代品）：

<bean id="myDataSource"
    class="org.springframework.jdbc.datasource.SimpleDriverDataSource">
    <property name="driverClass" value="org.h2.Driver" />
    <property name="url" value="jdbc:h2:mem:" />
    ...
</bean>

<bean id="mySessionFactory"
    class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
    <property name="dataSource" ref="myDataSource" />
    <property name="packagesToScan">
        <array>
            <value>mypackage.entities</value>
        </array>
    </property>
</bean>

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

<aop:config>
    <aop:pointcut id="daoMethods" expression="execution(* mypackage.*Dao.*(..))" />
    <aop:advisor advice-ref="requiredTxAdvice" pointcut-ref="daoMethods" />
</aop:config>

<tx:advice id="requiredTxAdvice" transaction-manager="myTransactionManager">
    <tx:attributes>
        <tx:method name="*" propagation="REQUIRED" />
    </tx:attributes>
</tx:advice>

class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor" />
<bean id="dummyDao" class="mypackage.DummyDaoImpl">
    <property name="sessionFactory" ref="mySessionFactory" />
</bean>

hibernate.properties看起来像：

hibernate.dialect=org.hibernate.dialect.H2Dialect
hibernate.show_sql=true
hibernate.format_sql=true
hibernate.id.new_generator_mappings=true
hibernate.hbm2ddl.auto=create-drop

（创建也不起作用）

Answer 1

当您将数据库URL指定为jdbc:h2:mem:时，H2会为每个连接创建新数据库，因此每个Hibernate会话都会看到自己的空数据库。

因此，您需要指定数据库名称，以从不同的连接访问同一数据库。此外，您还需要防止数据库在没有活动连接时关闭。生成的URL如下所示：jdbc:h2:mem:foo;DB_CLOSE_DELAY=-1。

另请注意，Spring提供了对嵌入式数据库的内置支持，请参阅12.8 Embedded database support。

未创建内存数据库，但日志显示已执行DDL

1 个答案: