java - 存储库接口(interface)中的 MySQLSyntaxErrorException

Question

我正在使用下面的代码:

@RestResource(exported = false)
public interface TransactionRepository extends CrudRepository<Transaction, Long> {

@Query(value = "SELECT " +
        "    new com.test.technical.dto.TopMemberDTO(m.id, m.name, m.email, COUNT(t.book_id)) " +
        "FROM " +
        "    member m JOIN transaction t where m.id = t.member_id and t.date_of_issue >= :dateOfIssue and t.date_of_return <= :dateOfReturn " +
        "GROUP BY t.member_id ORDER BY COUNT(t.book_id) DESC limit 5", nativeQuery = true)


List<TopMemberDTO> getTopMembers(@Param("dateOfIssue") LocalDateTime dateOfIssue, @Param("dateOfReturn") LocalDateTime dateOfReturn); 

错误是:

您的 SQL 语法有错误；检查与您的 MySQL 服务器版本相对应的手册，了解在 '.test.technical.dto.TopMemberDTO(m.id, m.name, m.email, COUNT(t.book_id)) F' 行附近使用的正确语法1

Answer 1

您正在使用jpql并且您说它是nativeQuery = true，您需要更改它。此类查询我以这种方式使用它们。

@Entity
@Table(name = "TABLE")
@NamedQueries({
    @NamedQuery(name = "ANYIDENTIFIER", query = "select new example.DTO(rp.example) from 
RemesaProceso rp where rp.vigente = true and rp.proceso.idProceso = :idProceso order by rp.remesaId asc")
})

在另一个类中，我返回 DTO 列表

return entityManager.createNamedQuery("ANYIDENTIFIER").setParameter("idProceso ", 2).getSingleResult();