如何在sql server 2008中聲明時使用光標條件？

Question

我有一個像下面

Declare Cur_1 cursor for 

     if @EmployeeId <> is not null 
      begin 
       select EmployeeID from tbl_Employee where EEmployeeStatus='Active' and EmployeeID = @EmployeeId 
      end 
     else 
      begin 
       select EmployeeID from tbl_Employee where EEmployeeStatus='Active' 
      end 

Open Cur_1 

    Fetch next from Cur_1 into @EmpId 
    While @@FETCH_STATUS=0 
    Begin 

    end 
Close Cur_1 
deallocate Cur_1 

查詢，但它不工作。它顯示我的語法錯誤。

它顯示語法錯誤，如果條件..

請幫我.......

Answer 1

if @Feild is not null 
     begin 
      Declare your_Cursor_Name cursor for  
        select Feild1 from Your_table where 1=1 
     end 
    else 
     begin 
      Declare your_Cursor_Name cursor for  
        select Feild1 from Your_table where 1=1 
     end 

    Open your_Cursor_Name 

     Fetch next from your_Cursor_Name into @xyz 
     While @@FETCH_STATUS=0 
     Begin 
      `enter code here 
     end 
Close your_Cursor_Name 

Answer 2

的Corrrect語法必須是：if @EmployeeId is not null

沒有必要<>前不是null，因爲is是這裏的運營商。

Answer 3

，請不要使用，如果建設光標內，而不是有兩個可能的聲明：

if @EmployeeId is not null 
     begin 
      Declare Cur_1 cursor for  
        select EmployeeID from tbl_Employee where EEmployeeStatus='Active' and EmployeeID = @EmployeeId 
     end 
    else 
     begin 
      Declare Cur_1 cursor for  
        select EmployeeID from tbl_Employee where EEmployeeStatus='Active' 
     end 

    Open Cur_1 

     Fetch next from Cur_1 into @EmpId 
     While @@FETCH_STATUS=0 
     Begin 

     end 
    Close Cur_1 
    deallocate Cur_1