spring data jpa @Query注解中delete语句报错怎么解决

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 /** 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 {    @Query("SELECT a from #{#entityName} a where a.isDeleted=0 and a.category like %?1%")    fun findByCategory(category: String): MutableList     @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     @Query("SELECT a from #{#entityName} a where a.isDeleted=0 and a.isFavorite=1")    fun findAllFavorite(pageable: Pageable): Page     @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     @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 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 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 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 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{    @Query(value = "select * from #{#entityName} b where b.name=?1", nativeQuery = true)    List findByName(String name);}

6. 一个较完整的例子

public interface BookQueryRepositoryExample extends Repository {    @Query(value = "select * from Book b where b.name=?1", nativeQuery = true)     List 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 findByPriceRange(long price1, long price2);     @Query(value = "select name,author,price from Book b where b.name like %:name%")    List 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 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 {     @Query(value = "select p from Salescharge p where ordertime>:startTime and ordertime<:endTime and staffid like :staffidlike and length(staffid)=(length(:staffid)+2)")        List 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 findByName(String name);

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