我需要使用一个数据库进行查询(非修改),另一个用于命令(修改).我使用的是
Spring Data JPA,所以我有两个配置类：
@Configuration
@EnableJpaRepositories(value = "com.company.read",entityManagerFactoryRef = "readingEntityManagerFactory",transactionManagerRef = "readingTransactionManager")
@EnableTransactionManagement
public class SpringDataJpaReadingConfiguration {
@Bean(name = "readingEntityManagerFactory")
public EntityManagerFactory readingEntityManagerFactory() {
return Persistence.createEntityManagerFactory("persistence.reading");
}
@Bean(name = "readingExceptionTranslator")
public HibernateExceptionTranslator readingHibernateExceptionTranslator() {
return new HibernateExceptionTranslator();
}
@Bean(name = "readingTransactionManager")
public JpaTransactionManager readingTransactionManager() {
return new JpaTransactionManager();
}
}
@Configuration
@EnableJpaRepositories(value = "com.company.write",entityManagerFactoryRef = "writingEntityManagerFactory",transactionManagerRef = "writingTransactionManager")
@EnableTransactionManagement
public class SpringDataJpaWritingConfiguration {
@Bean(name = "writingEntityManagerFactory")
public EntityManagerFactory writingEntityManagerFactory() {
return Persistence.createEntityManagerFactory("persistence.writing");
}
@Bean(name = "writingExceptionTranslator")
public HibernateExceptionTranslator writingHibernateExceptionTranslator() {
return new HibernateExceptionTranslator();
}
@Bean(name = "writingTransactionManager")
public JpaTransactionManager writingTransactionManager() {
return new JpaTransactionManager();
}
}
在我的存储库中,我有时需要使用EntityManager来决定如下使用：
@Repository
public class UserReadingRepository {
@PersistenceContext(unitName = "persistence.reading")
private EntityManager em;
// some useful queries here
}
我使用persistence.xml中定义的持久化单元的名称：
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
version="2.0">
<persistence-unit name="persistence.reading" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
<non-jta-data-source>ReadingDS</non-jta-data-source>
<properties>
<property name="hibernate.dialect" value="org.hibernate.dialect.MysqLDialect" />
<property name="hibernate.show_sql" value="true" />
</properties>
</persistence-unit>
<persistence-unit name="persistence.writing" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
<non-jta-data-source>WritingDS</non-jta-data-source>
<properties>
<property name="hibernate.dialect" value="org.hibernate.dialect.MysqLDialect" />
<property name="hibernate.show_sql" value="true" />
</properties>
</persistence-unit>
</persistence>
Spring throws org.springframework.beans.factory.NoSuchBeanDefinitionException：未定义名为“persistence.reading”的bean.奇怪的是,看起来Spring试图用持久化单元名称来实例化一个bean？我错配了什么吗？
更新：当我从@PersistenceContext注释中删除unitName =“persistence.reading”时,我会得到以下错误：
org.springframework.beans.factory.NoUniqueBeanDefinitionException：没有定义类型为[javax.persistence.EntityManagerFactory]的符合条件的bean：预期的单个匹配bean但是找到2：readingEntityManagerFactory,writingEntityManagerFactory
更新2：Rohit建议(在注释中)连接EntityManagerFactory.所以我试图做以下：
@PersistenceUnit(unitName = "persistence.reading") private EntityManagerFactory emf;
但是Spring只报告：org.springframework.beans.factory.NoSuchBeanDefinitionException：没有定义名为“persistence.reading”的bean
FINAL FIX：
感谢Vlad的答案,我能够更新代码以使用以下内容(只要确保你也定义了你的dataSource bean)：
@Bean(name = "readingEntityManagerFactory")
public EntityManagerFactory readingEntityManagerFactory() {
LocalContainerEntityManagerfactorybean em = new LocalContainerEntityManagerfactorybean();
em.setPersistenceUnitName("persistence.reading");
em.setDataSource(dataSource());
em.setPackagesToScan("com.company");
em.setJpaVendorAdapter(new HibernateJpaVendorAdapter());
em.afterPropertiesSet();
return em.getObject();
}
解决方法
EntityManageFactory不是
properly configured.你应该使用一个LocalContainerEntityManagerfactorybean：
@Bean(name = "readingEntityManagerFactory")
public EntityManagerFactory readingEntityManagerFactory() {
LocalContainerEntityManagerfactorybean em = new LocalContainerEntityManagerfactorybean();
em.setPersistenceUnitName("persistence.reading");
em.setDataSource(dataSource());
em.setPackagesToScan("com.company");
em.setJpaVendorAdapter(new HibernateJpaVendorAdapter());
em.afterPropertiesSet();
return em.getObject();
}
JpaTransactionManager也是配置错误的.应该是这样的：
@Bean(name = "readingTransactionManager")
public PlatformTransactionManager readingTransactionManager(){
JpaTransactionManager transactionManager = new JpaTransactionManager();
transactionManager.setEntityManagerFactory(readingEntityManagerFactory());
return transactionManager;
}
您需要对阅读和写入EntityManager配置执行相同操作.
