Hibernate/JPA:将实体映射到不同的数据库

Question

我有一个管理3个数据库的应用程序.我在seam框架上使用了带JPA的hibernate.

所以我有一个persitence.xml文件,有三个像这样的persitence-unit(我删除了db2和db3的属性):

<persistence-unit name="db1" transaction-type="JTA" >
    <provider>org.hibernate.ejb.HibernatePersistence</provider>
    <jta-data-source>db1source</jta-data-source>
    <properties>
        <property name="hibernate.dialect"
            value="org.hibernate.dialect.Oracle10gDialect" />
        <property name="hibernate.connection.driver_class"
            value="oracle.jdbc.driver.OracleDriver" />
        <property name="hibernate.hbm2ddl.auto" value="validate" />
        <property name="hibernate.show_sql" value="false" />
        <property name="hibernate.format_sql" value="true" />
        <property name="hibernate.default_schema" value="SI_TEC" />
        <property name="hibernate.validator.apply_to_ddl" value="false" />
        <property name="hibernate.transaction.manager_lookup_class"
            value="org.hibernate.transaction.WeblogicTransactionManagerLookup" />
    </properties>
</persistence-unit>

<persistence-unit name="db2" transaction-type="JTA">
    <provider>org.hibernate.ejb.HibernatePersistence</provider>
    <jta-data-source>d2source</jta-data-source>
</persistence-unit>

<persistence-unit name="db3" transaction-type="JTA">
    <provider>org.hibernate.ejb.HibernatePersistence</provider>
    <jta-data-source>d3source</jta-data-source>
</persistence-unit>

在我的seam components.xml文件中,我使用我的hibernate配置创建了3个managed-persistence-context来映射seam.

最后,我有几个实体,我的问题就在这里.我需要在db2和db3中的其他实体中保留一些实体.所以数据库模式是不同的,当我部署我的应用程序时,我收到此错误:

org.hibernate.HibernateException: Missing table: PORTAILPERMISSION
    at org.hibernate.cfg.Configuration.validateSchema(Configuration.java:1113)
    at org.hibernate.tool.hbm2ddl.SchemaValidator.validate(SchemaValidator.java:139)
    at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:349)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1327)
    at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:867)
    Truncated. see log file for complete stacktrace

因为,db2中不存在表PORTAILPERMISSION.

我的问题是:

如何在实体类中指定在启动时必须使用哪个数据库(或persitence-unit)来验证实体？

谢谢你的帮助.

Answer 1

您尝试<class>..</class>在每个持久性单元中显式列出类 ( )。并使用

<exclude-unlisted-classes>true</exclude-unlisted-classes>