spring - 内存数据库未创建但日志显示执行了DDL

Question

我正在尝试设置 spring 环境来运行内存数据库，该数据库是根据提供的映射自动创建的。在执行过程中，我可以在日志中看到执行了 DDL 语句，但是当 hibernate 尝试将数据插入到创建的表中时，我收到“找不到表”异常。

可能出现什么问题？

使用 spring 3.1.1 和 Hibernate 4.1.1 以及 H2 版本 1.3.165。

日志看起来像(仅留下相关记录):

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”是完整包名称的替换):

<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 session 都会看到自己的空数据库。

因此，您需要指定数据库名称，以便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事件连接时被关闭。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 .