本篇内容主要讲解“spring data jpa @Query注解中delete语句报错怎么解决”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“spring data jpa @Query注解中delete语句报错怎么解决”吧!
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.dao import 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 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) }JPA使用@Query注解实例
1. 一个使用@Query注解的简单例子
@Query(value = "select name,author,price from Book b where b.price>?1 and b.price<?2")List<Book> findByPriceRange(long price1, long price2);2. Like表达式
@Query(value = "select name,author,price from Book b where b.name like %:name%")List<Book> findByNameMatch(@Param("name") String name);3. 使用Native SQL Query
所谓本地查询，就是使用原生的sql语句（根据数据库的不同，在sql的语法或结构方面可能有所区别）进行查询数据库的操作。
@Query(value = "select * from book b where b.name=?1", nativeQuery = true)List<Book> findByName(String name);4. 使用@Param注解注入参数
@Query(value = "select name,author,price from Book b where b.name = :name AND b.author=:author AND b.price=:price")List<Book> findByNamedParam(@Param("name") String name, @Param("author") String author, @Param("price") long price);5. SPEL表达式(使用时请参考最后的补充说明)
'#{#entityName}'值为'Book'对象对应的数据表名称(book)。
public interface BookQueryRepositoryExample extends Repository<Book, Long>{ @Query(value = "select * from #{#entityName} b where b.name=?1", nativeQuery = true) List<Book> findByName(String name);}6. 一个较完整的例子
public interface BookQueryRepositoryExample extends Repository<Book, Long> { @Query(value = "select * from Book b where b.name=?1", nativeQuery = true) List<Book> findByName(String name);// 此方法sql将会报错(java.lang.IllegalArgumentException)，看出原因了吗,若没看出来，请看下一个例子 @Query(value = "select name,author,price from Book b where b.price>?1 and b.price<?2") List<Book> findByPriceRange(long price1, long price2); @Query(value = "select name,author,price from Book b where b.name like %:name%") List<Book> findByNameMatch(@Param("name") String name); @Query(value = "select name,author,price from Book b where b.name = :name AND b.author=:author AND b.price=:price") List<Book> findByNamedParam(@Param("name") String name, @Param("author") String author, @Param("price") long price); }7. S模糊查询注意问题
模糊查询时在原生sql中like后跟随的值需要单独传，%不支持单独出现；在使用length查询数据库时需要（）单独括起。
@Repositorypublic interface SaleschargeRespolity extends JpaRepository<Salescharge,Integer> { @Query(value = "select p from Salescharge p where ordertime>:startTime and ordertime<:endTime and staffid like :staffidlike and length(staffid)=(length(:staffid)+2)") List<Salescharge> finAllSubChargeInfo(@Param("startTime") Date startTime, @Param("endTime") Date endTime,@Param("staffid") String staffid, @Param("staffidlike") String staffidlike); }8. 解释例6中错误的原因
因为指定了nativeQuery = true，即使用原生的sql语句查询。使用java对象'Book'作为表名来查自然是不对的。只需将Book替换为表名book。
@Query(value = "select * from book b where b.name=?1", nativeQuery = true)List<Book> findByName(String name);到此，相信大家对“spring data jpa @Query注解中delete语句报错怎么解决”有了更深的了解，不妨来实际操作一番吧！这里是编程网网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！
