在Hibernate JPA中进行Hbm2dll初始化,具有多个数据库+多租户

时间:2016-10-26 11:03:58

标签: hibernate jpa initialization multi-tenant ddl

如何使用LocalContainerEntityManagerFactoryBean使用hbm2dll初始化多个数据库?

我在MultiTenancy中为每个租户使用不同的数据源。 我在ApplicationContext.xml中有一个id为“dataSource”的默认数据源,我使用“dataSource”的属性为每个租户生成一个数据源,但更改了url。我将它们添加到自定义的MapDataSourceLookup中。

我尝试使用LocalContainerEntityManagerFactoryBean配置JPA初始化。

<bean class="org.springframework.orm.jpa.JpaTransactionManager"
    id="transactionManager">
    <property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>

<bean
    class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"
    id="entityManagerFactory" >
    <property name="persistenceUnitManager" ref="pum"/>
    <property name="jpaVendorAdapter">
        <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
            <property name="databasePlatform" value="${database.dialect}" />
        </bean>
    </property>
    <property name="jpaPropertyMap">
        <map>
            <entry key="hibernate.multi_tenant_connection_provider" value-ref="multitenancyConnectionProvider"/>
            <entry key="hibernate.tenant_identifier_resolver" value-ref="tenantResolver"/>                                              
        </map>
    </property>
</bean>

<bean id="pum" class="org.springframework.orm.jpa.persistenceunit.DefaultPersistenceUnitManager">
    <property name="dataSourceLookup" ref="dataSourceLookup"/>
    <property name="persistenceXmlLocations">
        <list>
            <value>classpath:META-INF/persistence.xml</value>
        </list>
    </property>
</bean>


<bean class="com.jolbox.bonecp.BoneCPDataSource" destroy-method="close"
    id="dataSource">
    <property name="driverClass" value="${database.driverClassName}" />
    <property name="jdbcUrl" value="${database.url}" />
    <property name="username" value="${database.username}" />
    <property name="password" value="${database.password}" />
    <property name="idleConnectionTestPeriod" value="${database.idleConnectionTestPeriod}" />
    <property name="idleMaxAge" value="${database.idleMaxAge}" />
    <property name="maxConnectionsPerPartition" value="${database.maxConnectionsPerPartition}" />
    <property name="minConnectionsPerPartition" value="${database.minConnectionsPerPartition}" />
    <property name="partitionCount" value="${database.partitionCount}" />
    <property name="acquireIncrement" value="${database.acquireIncrement}" />
    <property name="statementsCacheSize" value="${database.statementsCacheSize}" />
    <property name="releaseHelperThreads" value="${database.releaseHelperThreads}" />
</bean>

我有一个注入的自定义@component dataSourceLookup,它以这种方式创建不同的数据源。

        //Add new datasource with configuration from "dataSource" and new url per tenant
        BoneCPDataSource customDataSource = new BoneCPDataSource(defaultDataSource.getConfig());
        customDataSource.setJdbcUrl(props.getProperty("database.url"));
        addDataSource(tenantId, customDataSource);

        logger.info("Configuring tenant: " + tenantId + " Properties: " + customDataSource.toString());

这是我的persistence.xml:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.0" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
<persistence-unit name="persistenceUnit"
    transaction-type="RESOURCE_LOCAL">      
<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>     
    <properties>            
        <property name="hibernate.hbm2ddl.auto" value="update" />
        <property name="hibernate.ejb.naming_strategy" value="org.hibernate.cfg.ImprovedNamingStrategy" />
        <property name="hibernate.connection.charSet" value="UTF-8" />
        <property name="hibernate.show_sql" value="true" />         

        <!--  Multi-tenancy properties -->
        <property name="hibernate.multiTenancy" value="DATABASE" />
    </properties>
</persistence-unit>

现在唯一正在创建的方案是默认数据库。但是没有创建指向其他数据库的数据源。当我尝试访问用户时会产生此错误,因为USER表不存在:

引起:org.hsqldb.HsqlException:用户缺少未找到的权限或对象:USER

1 个答案:

答案 0 :(得分:0)

我必须使用自定义扩展类LocalContainerEntityManagerFactoryBean并实现方法postProcessEntityManagerFactory(EntityManagerFactory emf,PersistenceUnitInfo pui)来解决它。

在那个方法中,我循环不同的数据源,并在每次迭代中使用该数据源创建entitymanagerfactory,我知道它不是最好的,但如果你知道更好的解决方案,我想听:)。目前多租户中的hibernate不支持Schemaexport,这是我找到的解决方案。