spring boot，数据存在于数据库中，但查询结果为空

Question

界面CompanyMasterInterface：

    @Query(nativeQuery = true,
            value ="SELECT s.* from companymaster as s WHERE s.name = ':title'")
    public CompanyMaster ByNameOrDaName(@Param("title") String title);

服务CompanyMasterServiceImpl：

  @Autowired
  private CompanyMasterInterface services;

  public CompanyMaster ByNameOrDaName(String title) {
    return services.ByNameOrDaName(title);
 }

控制器： 例如名称是“Taj”并且它存在于数据库中。

   @Autowired
   private CompanyMasterServiceImpl companyImpl;

   ////now the class is as following

   CompanyMaster cmp = companyImpl.ByNameOrDaName("Taj");
   
   if(cmp == null){
      System.out.println("there is no data");
   } else {
      System.out.println("there is data");
   }
   

问题是为什么我总是得到 {cmp is null} 而 Taj 在数据库中。

Answer 1

“SELECT s.* from companymaster as s WHERE s.name = ':title”不正确，您应该使用“CompanyMaster ”，而不是“companymaster ”。