java - Inject 2 Data sources into spring+hibernate application always throw no transaction is in progress 错误

Question

我有 Spring + JPA (Hibernate) 项目，在该项目中我连接到 MsSQL 数据库，现在我需要打开一个新连接，但这次是针对 MySQL>。我正在使用 XML 配置

<bean id="hibernateJpaVendorAdapter"
    class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter" />

<bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource"
    destroy-method="close">
    <property name="driverClassName" value="${spring.datasource.driverClassName}" />
   ....
</bean>

<bean id="entityManagerFactory"
    class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"
    p:dataSource-ref="dataSource" p:packagesToScan="com.wsg.admin.api.model"
    p:jpaVendorAdapter-ref="hibernateJpaVendorAdapter">

    <property name="jpaProperties">
        <props>
            <prop key="hibernate.cache.use_second_level_cache">false</prop>
            ....
        </props>
    </property>
    <property name="persistenceUnitName" value="dataSourcePU" />
</bean>

<tx:annotation-driven transaction-manager="transactionManager" />

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

<!-- Configure the MySQL connection -->
<bean id="enduserDataSource" class="org.apache.commons.dbcp2.BasicDataSource"
    destroy-method="close">
    <property name="driverClassName" value="${enduser.db.driver}" />
    ....
</bean>

<bean id="enduserEntityManagerFactory"
    class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"
    p:dataSource-ref="enduserDataSource" p:packagesToScan="com.wsg.admin.api.model"
    p:jpaVendorAdapter-ref="hibernateJpaVendorAdapter">

    <property name="jpaProperties">
        <props>
            <prop key="hibernate.cache.use_second_level_cache">false</prop>
            ....
        </props>
    </property>
    <property name="persistenceUnitName" value="enduserDataSourcePU" />
</bean>

<tx:annotation-driven transaction-manager="enduserTransactionManager" />

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

然后我尝试使用片段注入(inject) entityManager

@PersistenceContext(unitName="dataSourcePU")
EntityManager entityManager;

@PersistenceContext(unitName="enduserDataSourcePU")
EntityManager endUserEntityManager;

它只适用于第一个数据库，但是当尝试在第二个数据库上坚持时，它会返回错误

javax.persistence.TransactionRequiredException: no transaction is in progress

我尝试用 @Transactional("transactionManager") 注释方法(包含 persist() 调用)一次，并且 @Transactional(value = "enduserTransactionManager") 另一次，第二个 entityManager 总是抛出同样的异常

我试图将 persist() 调用分成不同的方法，并对这两个方法分别进行了注释 @Transactional("transactionManager") 和 @Transactional(value = "enduserTransactionManager") 但还是报同样的错误

@Transactional(value = "enduserTransactionManager")
private void createNewBrandMySQL(Brand newBrand) {

和

@Transactional("transactionManager")
public Integer createNewBrand(Brand newBrand) throws EntityDoesntExistException { 
//this method calls createNewBrandMySQL

Answer 1

已修复，通过使用 entityManagerFactory 直接注入(inject)一个 em 和另一个

@PersistenceContext(unitName = "dataSourcePU")
EntityManager entityManager;

@Autowired
@Qualifier("enduserEntityManagerFactory")
EntityManagerFactory endUserEntityManagerFactory;

EntityManager endUserEntityManager;

@PostConstruct
public void init() {
    endUserEntityManager = endUserEntityManagerFactory.createEntityManager();
}