MS SQL存儲過程運行時錯誤

Question

串聯MSSQL查詢時如何糾正sp中的錯誤？

SET  @Ws_Sql = 'SELECT CONVERT(VARCHAR(25),@WS_STATUS) AS [Status],A.RECNUB AS [Rec #], A.REVCOD AS [Revenue CODE], ' 
IF @LNKOPT = 1 
BEGIN
    SET  @Ws_Sql = @WS_SQL +''' AS [Status],'
END
ELSE IF @LNKOPT = 2
BEGIN
    SET  @Ws_Sql = @WS_SQL +'' + 'Modified' + ' AS [Status],'
END
ELSE IF @LNKOPT = 3
BEGIN
    SET  @Ws_Sql = @WS_SQL +'' + 'Deleted' + ' AS [Status],'
END
ELSE IF @LNKOPT = 4
BEGIN
    SET  @Ws_Sql = @WS_SQL +'' + 'Reprint' + ' AS [Status],'
END

Answer 1

如果@LNKOPT = 1，是否要為[狀態]輸出列分配一個空值？

在這種情況下，您需要使用雙撇號來轉義撇號字符：

IF @LNKOPT = 1 
BEGIN
    SET  @Ws_Sql = @WS_SQL +''''' AS [Status],'
END

這將導致@Ws_Sql包含： '' AS [Status] （否則將導致' AS [Status] ，這將在執行@Ws_Sql字符串時產生錯誤）。