排查spring data实现自定义Repository的一个问题

       项目中尝试使用spring-data作为快速开发工具，今天需要实现一个具体的Repository，然后就自定义了一个，结果报下面的错误。

       

Caused by: org.springframework.data.mapping.PropertyReferenceException: No property update found for type xxx.yyy.zzz.customer.model.Consumer
	at org.springframework.data.mapping.PropertyPath.<init>(PropertyPath.java:74)
	at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:326)
	at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:352)
	at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:352)
	at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:306)
	at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:270)
	at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:244)
	at org.springframework.data.repository.query.parser.Part.<init>(Part.java:73)
	at org.springframework.data.repository.query.parser.PartTree$OrPart.<init>(PartTree.java:180)
	at org.springframework.data.repository.query.parser.PartTree$Predicate.buildTree(PartTree.java:260)
	at org.springframework.data.repository.query.parser.PartTree$Predicate.<init>(PartTree.java:240)
	at org.springframework.data.repository.query.parser.PartTree.<init>(PartTree.java:68)
	at org.springframework.data.jpa.repository.query.PartTreeJpaQuery.<init>(PartTreeJpaQuery.java:57)
	at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$CreateQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:90)
	at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$CreateIfNotFoundQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:162)
	at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$AbstractQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:68)
	at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.<init>(RepositoryFactorySupport.java:280)
	at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:148)
	at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.getObject(RepositoryFactoryBeanSupport.java:125)
	at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.getObject(RepositoryFactoryBeanSupport.java:41)
	at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:142)
	... 33 more

     从错误来看是spring尝试着去解析这个类了，然后发生了错误，后来发现是命名规范不符合springdata的规范。

 

     springdata的规范如下，要遵从repository-custom-impl的规范，具体如下:

      

public interface ConsumerRepository extends JpaRepository<Consumer, Long>,ConsumerRepositoryCustom {
	List<Consumer> findByCusinessType(int customerType);
}

    我们需要额外实现的一个自定义的方法：

   

public interface ConsumerRepositoryCustom {
	void updateCustomerNumber(Long oldId, Long newId);
}

 

   我们自定义的实现类：

   

public  class ConsumerRepositoryImpl implements ConsumerRepositoryCustom{
	@PersistenceContext
	private EntityManager entityManager;
	
	@Override
	public void updateCustomerNumber(Long oldId,Long newId){
		Query query = entityManager.createQuery("fddffdfdfd");
		query.setParameter(1, newId); 
		query.setParameter(2, oldId);
		
		query.executeUpdate();
	}

}

       在这个地方，我们经常会将实现类写成ConsumerRepositoryCustomImpl, 这样的话就出错了，从命名来看，我们可以看出来，最后说明一下如果我们的Repository是ICustomDao, 那么我们的custom接口应该命名成ICustomDaoCustom，相应的实现类就应该为ICustomDaoImpl.

评论

1 楼 jinnianshilongnian 2013-12-26  

之前遇到过一次这样的问题：
ARepository {
    A getA();
}

ARepositoryImpl{
    A getA() {

    }
}

忘了在Impl中加public，一直报类似于No property update found for type xxx.yyy.zzz.customer.model.Consumer。 排查了好久