T-SQL 동적 쿼리

Question

제 질문은 어떻게 스마트 쿼리 문자열을 향상시킬 수 있습니까?

DB에서 매개 변수 쿼리 데이터를 사용하려면 매개 변수가 null 일 때 제거됩니다.

내 쿼리 문자열은 다음과 추천했습니다 :

ALTER procedure [dbo].[spQueryDataFromCPREFROM] 
@CompanyName varchar(50), 
@TestDDL varchar(20), 
@TesterName varchar(50), 
@DatepickerForTestDate datetime, 
@ApplyDate datetime, 
@TestTypeDDL varchar(1), 
@QueryString nvarchar(max) 
as 
begin 
    if @CompanyName is not null 
     and @TestDDL is not null 
     and @TesterName is not null 
     and @DatepickerForTestDate is not null 
     and @ApplyDate is not null 
     and @TestTypeDDL is not null 
     and @QueryString is not null 
     begin 
      select @QueryString = 'select * from [dbo].[CPREFROM] as CF where CF.[UNIT_TID] ='+ @CompanyName 
            +'and CF.[ELIGIBLE_RATING] ='+ @TestDDL 
            +'and CF.[Name] =' + @TesterName 
            +'and CF.[CHECKDATE] ='+ @DatepickerForTestDate 
            +'and CF.[APPLYDATE] =' + @ApplyDate 
            +'and CF.[A_S] =' + @TestTypeDDL 
     end 
    else if @CompanyName is null 
      and @TestDDL is not null 
      and @TesterName is not null 
      and @DatepickerForTestDate is not null 
      and @ApplyDate is not null 
      and @TestTypeDDL is not null 
      and @QueryString is not null 
      begin 
       select @QueryString = 'select * from [dbo].[CPREFROM] as CF where CF.[ELIGIBLE_RATING] ='+ @TestDDL 
            +'and CF.[Name] =' + @TesterName 
            +'and CF.[CHECKDATE] ='+ @DatepickerForTestDate 
            +'and CF.[APPLYDATE] =' + @ApplyDate 
            +'and CF.[A_S] =' + @TestTypeDDL 
      end 
    ... 

Answer 1

당신을 위해 도움 아래 수 있습니까? 예 :

"CF. [UNIT_TID = CF [UNIT_TID]."같은 1

 select @QueryString = 'select * from [dbo].[CPREFROM] as CF where CF.[UNIT_TID] ='+ ISNULL(@CompanyName,'CF.[UNIT_TID]') 
           +'and CF.[ELIGIBLE_RATING] ='+ ISNULL(@TestDDL,'CF.[ELIGIBLE_RATING]') 
           +'and CF.[Name] =' + ISNULL(@TesterName,'CF.[Name]') 
           +'and CF.[CHECKDATE] ='+ ISNULL(@DatepickerForTestDate,'CF.[CHECKDATE]') 
           +'and CF.[APPLYDATE] =' + ISNULL(@ApplyDate,'CF.[APPLYDATE]') 
           +'and CF.[A_S] =' + ISNULL(@TestTypeDDL,'CF.[A_S]') 

= 1하지만 가능한 값이 널 (null) 인 경우에는 값 때문에 처리하기 ISNULL를 사용할 필요 "NULL = NULL"의 결과는 참이 아닙니다.

샘플 :

+'and ISNULL(CF.[Name],'''') =' + ISNULL(@TesterName,'ISNULL(CF.[Name],'''')')