Question

我在ms sql server中使用游标

DECLARE @LineOfAuthoritySubString varchar(100);
declare @tbProductId int;
declare @tbLineOfAuthorityId int;

 DECLARE @MyCursor CURSOR
 SET @MyCursor = CURSOR FAST_FORWARD
 FOR
 Select TempLineOfAuthority FROM #tbTempLineOfAuthority
 OPEN @MyCursor
 FETCH NEXT FROM @MyCursor
 INTO @LineOfAuthoritySubString  
 WHILE @@FETCH_STATUS = 0
 BEGIN
 Set @tbLineOfAuthorityId = (Select LineOfAuthority
 from tbLineOfAuthority where LineOfAuthorityX = @LineOfAuthorityNameSubString);

  INSERT INTO tbProductLineOfAuthority(ProductId, LineOfAuthortyId)   
  VALUES(@tbProductId, @tbLineOfAuthorityId);

  FETCH NEXT FROM @MyCursor
  INTO @LineOfAuthoritySubString
  END
  CLOSE @MyCursor
  DEALLOCATE @MyCursor

它不起作用。它将null值赋给变量@tbLineOfAuthorityId。

Answer 1

您正在@LineOfAuthoritySubString和中使用条件 @LineOfAuthorityNameSubString变量中插入游标值

两个变量名都不匹配。

FETCH NEXT FROM @MyCursor INTO @LineOfAuthoritySubString

IN上面你在变量@LineOfAuthoritySubString中获取值。

 Set @tbLineOfAuthorityId = (Select LineOfAuthority  from tbLineOfAuthority where LineOfAuthorityX = @LineOfAuthorityNameSubString);

但是当您从表tbLineOfAuthority中选择时，请在查询的位置观察您使用的变量。

应该 @LineOfAuthoritySubString 而不是 @LineOfAuthorityNameSubString

请在编辑后的查询下方尝试。

DECLARE @LineOfAuthoritySubString varchar(100);
declare @tbProductId int;
declare @tbLineOfAuthorityId int;

DECLARE @MyCursor CURSOR
SET @MyCursor = CURSOR FAST_FORWARD
FOR
Select TempLineOfAuthority FROM #tbTempLineOfAuthority
OPEN @MyCursor
FETCH NEXT FROM @MyCursor
INTO @LineOfAuthoritySubString  
WHILE @@FETCH_STATUS = 0
BEGIN
Set @tbLineOfAuthorityId = (Select LineOfAuthority
from tbLineOfAuthority where LineOfAuthorityX = @LineOfAuthoritySubString);

INSERT INTO tbProductLineOfAuthority(ProductId, LineOfAuthortyId)   
VALUES(@tbProductId, @tbLineOfAuthorityId);

FETCH NEXT FROM @MyCursor
INTO @LineOfAuthoritySubString
END
CLOSE @MyCursor
DEALLOCATE @MyCursor

游标在存储过程中不起作用

1 个答案: