我擁有相同的數據庫模式database_1和database_2,並且希望配置這兩個數據庫(數據庫模式相同)並決定運行時使用哪個數據庫。
我的persistence.xml是如下:多個數據庫Schema with Spring + Hibernate + JPA
<persistence-unit name="first" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<class>com.model.AboutUs</class>
<class>com.model.AccessCards</class>
<properties>
<property name="hibernate.dialect" value="com.util.customMySQLDialect" />
<property name="hibernate.hbm2ddl.auto" value="none" />
<property name="hibernate.show_sql" value="true" />
<property name="hibernate.cache.provider_class" value="org.hibernate.cache.HashtableCacheProvider" />
<property name="hibernate.jdbc.batch_size" value="20"/>
<property name="hibernate.cache.use_query_cache" value="true"/>
<property name="hibernate.cache.use_second_level_cache" value="true"/>
</properties>
</persistence-unit>
持久名第二此處配置如下:
<persistence-unit name="second" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<class>com.model.AboutUs</class>
<class>com.model.AccessCards</class>
<properties>
<property name="hibernate.dialect" value="com.util.customMySQLDialect" />
<property name="hibernate.hbm2ddl.auto" value="none" />
<property name="hibernate.show_sql" value="true" />
<property name="hibernate.cache.provider_class" value="org.hibernate.cache.HashtableCacheProvider" />
<property name="hibernate.jdbc.batch_size" value="20"/>
<property name="hibernate.cache.use_query_cache" value="true"/>
<property name="hibernate.cache.use_second_level_cache" value="true"/>
</properties>
</persistence-unit>
兩種持久化單元裝載同一類。 和現在我的database-configure.xml作爲我配置持久性單元與數據源的地方。如下面第一持久單元名稱configare與數據源名稱的數據源如:
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>
<bean id="entityManagerFactory"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="persistenceUnitName" value="first" />
<property name="persistenceXmlLocation" value="classpath*:META-INF/persistence.xml"/>
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter" />
</property>
</bean>
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
<property name="driverClass" value="${datasource.driverClassName}" />
<property name="jdbcUrl" value="${datasource.url}" />
<property name="user" value="${datasource.username}" />
<property name="password" value="${datasource.password}" />
<property name="acquireIncrement" value="1" />
<property name="acquireRetryAttempts" value="1" />
<property name="maxIdleTime" value="300" />
<property name="maxPoolSize" value="20" />
<property name="minPoolSize" value="3" />
<property name="maxStatements" value="300" />
<property name="testConnectionOnCheckin" value="true" />
</bean>
現在此代碼爲配置第二持久單元名稱與數據源名稱datasource5如下:
<bean id="transactionManager5" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory5" />
</bean>
<bean id="entityManagerFactory"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="dataSource" ref="dataSource5" />
<property name="persistenceUnitName" value="second" />
<property name="persistenceXmlLocation" value="classpath*:META-INF/persistence.xml"/>
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter" />
</property>
</bean>
<bean id="dataSource5" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
<property name="driverClass" value="${datasource.driverClassName}" />
<property name="jdbcUrl" value="${datasource5.url}" />
<property name="user" value="${datasource5.username}" />
<property name="password" value="${datasource5.password}" />
<property name="acquireIncrement" value="1" />
<property name="acquireRetryAttempts" value="1" />
<property name="maxIdleTime" value="300" />
<property name="maxPoolSize" value="20" />
<property name="minPoolSize" value="3" />
<property name="maxStatements" value="300" />
<property name="testConnectionOnCheckin" value="true" />
</bean>
現在我用實體管理用於保存數據庫中的數據,我正在使用mysql數據庫。我有第一個和第二個持久化單元名稱的實體管理器。現在
@PersistenceContext(unitName="first")
private EntityManager entityManager;
@PersistenceContext(unitName="second")
private EntityManager entityManager2;
實體管理器使用成功地堅持(對象)方法保存數據庫中的數據。 entityManager.persist(project);
和entityManager2使用persist(object)方法成功地在數據庫中保存數據(此處沒有異常)。但數據不會存儲在數據庫datbase_2中。
entityManager2.persist(project);
如果我在persistence.xml中的第一和第二改變持久性單元的順序然後entityManager2保存在數據庫和數據的EntityManager不數據庫中的數據保存。
任何人都有想法如何我可以使多個entitymanager相同的數據庫架構。