Spring Data JPA：不支持 DML 操作答案

【问题标题】：Spring Data JPA: Not supported for DML operationsSpring Data JPA：不支持 DML 操作
【发布时间】：2018-07-23 13:23:09
【问题描述】：

我在扩展CrudRepository 的界面中为 Amazon Aurora DB 编写了一个查询，以删除一些对象，但是当我执行查询时它会引发异常！

@Transactional
@Query("delete from HotelPrice hp where hp.updateDate < ?1 ")
void deletePriceOlderThan   (Date date);

异常跟踪：

Caused by: java.lang.IllegalStateException: org.hibernate.hql.internal.QueryExecutionRequestException: Not supported for DML operations [delete from com.gamesa.backend.persistence.domain.backend.HotelPrice hp where hp.updateDate < ?1 ]
    at org.hibernate.jpa.internal.QueryImpl.getSingleResult(QueryImpl.java:554)
    at org.springframework.data.jpa.repository.query.JpaQueryExecution$SingleEntityExecution.doExecute(JpaQueryExecution.java:208)
    at org.springframework.data.jpa.repository.query.JpaQueryExecution.execute(JpaQueryExecution.java:87)
    at org.springframework.data.jpa.repository.query.AbstractJpaQuery.doExecute(AbstractJpaQuery.java:116)
    at org.springframework.data.jpa.repository.query.AbstractJpaQuery.execute(AbstractJpaQuery.java:106)
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:499)
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:477)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:56)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:282)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136)
    ... 35 common frames omitted

【问题讨论】：

能否为异常添加堆栈跟踪
你能在你的删除方法上添加'@Modifying'吗，这有效地删除了所有在EntityManager中仍然挂起的未刷新的更改。如果您不希望 EntityManager 被自动清除，您可以将 @Modifying 注释的 clearAutomatically 属性设置为 false
@Yogi，它有效，谢谢。请转换为答案
可能被认为与stackoverflow.com/questions/48684552/…重复
@enLopes - 将我的评论添加为答案

标签： spring-boot spring-data spring-data-jpa jpql amazon-aurora

【解决方案1】：

通过在查询方法上标注@Modifying，实现对实际上只需要参数绑定的修改查询的执行。

@Modifying 有效地删除 EntityManager 中所有未刷新的更改。如果您不希望 EntityManager 自动被清除，您可以将 @Modifying 注解的 clearAutomatically 属性设置为 false

工作代码将是：

@Transactional
@Modifying
@Query("delete from HotelPrice hp where hp.updateDate < ?1 ")
void deletePriceOlderThan   (Date date);

进一步阅读：

1.Spring Repostiories

【讨论】：