spring data jpa @Query注解中delete语句报错 ： @Modifying注解的使用

spring data jpa @Query注解中delete语句报错

项目中需要删除掉表中的一些数据

@Query("delete from EngineerServices es where es.engineerId = ?1")
int deleteByEgId(String engineerId);
但是提示了错误

org.hibernate.hql.QueryExecutionRequestException: Not supported for DML operations
通过查阅相关的资料发现，对于执行update和delete语句需要添加@Modifying注解

@Modifying
@Query("delete from EngineerServices es where es.engineerId = ?1")
int deleteByEgId(String engineerId);
不过，添加之后运行又出现了另一个错误

nested exception is javax.persistence.TransactionRequiredException: Executing an update/delete query
发现缺少Transaction，于是添加@Transactional

@Modifying
@Transactional
@Query("delete from EngineerServices es where es.engineerId = ?1")
int deleteByEgId(String engineerId);

到此，这条delete语句终于可以成功的执行了。

代码示例：

package com.easy.kotlin.chapter11_kotlin_springboot.daoimport com.easy.kotlin.chapter11_kotlin_springboot.entity.Imageimport org.springframework.data.domain.Pageimport org.springframework.data.domain.Pageableimport org.springframework.data.jpa.repository.Modifyingimport org.springframework.data.jpa.repository.Queryimport org.springframework.data.repository.PagingAndSortingRepositoryimport org.springframework.data.repository.query.Paramimport org.springframework.transaction.annotation.Transactional/** Created by jack on 2017/7/17.@Query注解里面的value和nativeQuery=true,意思是使用原生的sql查询语句.sql模糊查询like语法,我们在写sql的时候是这样写的like '%?%'但是在@Query的value字符串中, 这样写like %?1%另外，要注意的是： 对于执行update和delete语句需要添加@Modifying注解 */interface ImageRepository : PagingAndSortingRepository<Image, Long> {    @Query("SELECT a from #{#entityName} a where a.isDeleted=0 and a.category like %?1%")    fun findByCategory(category: String): MutableList<Image>    @Query("select count(*) from #{#entityName} a where a.isDeleted=0 and a.url = ?1")    fun countByUrl(url: String): Int    @Query("SELECT a from #{#entityName} a where a.isDeleted=0 and a.category like %:searchText%")    fun search(@Param("searchText") searchText: String, pageable: Pageable): Page<Image>    @Query("SELECT a from #{#entityName} a where a.isDeleted=0 and a.isFavorite=1")    fun findAllFavorite(pageable: Pageable): Page<Image>    @Query("SELECT a from #{#entityName} a where a.isDeleted=0 and a.isFavorite=1 and a.category like %:searchText%")    fun searchFavorite(@Param("searchText") searchText: String, pageable: Pageable): Page<Image>    @Modifying    @Transactional    @Query("update #{#entityName} a set a.isFavorite=1 where a.id=?1")    fun addFavorite(id: Long)    @Modifying    @Transactional    @Query("delete from #{#entityName} a where a.id=?1")    fun delete(id: Long)}