SQL SERVER FOR XML EXPLICIT

Question

我想一個SELECT FOR XML顯式聲明的結果分配給一個XML變量如

CREATE PROCEDURE BILLING_RESPONSE 
AS DECLARE @Data AS XML 

SET @Data = (SELECT 

       1 AS Tag, 
       NULL AS Parent, 
       NULL AS 'CallTransactions!1!', 
       NULL AS 'TCALTRS!2!TRS_DAT_TE!cdata', 
       NULL AS 'TCALTRS!2!TRS_CRT_DT!Element' 
      UNION ALL 
      SELECT 
       2 AS Tag, 
       1 AS Parent, 
       NULL, 
       TRS_DAT_TE, 
       TRS_CRT_DT 
      FROM TCALTRS 
      WHERE TRS_CRT_DT between CONVERT(date,GETDATE()-1) and CONVERT(date,getdate()) and 
      TRS_DAT_TE like '%(Submit Response)%' 
      FOR XML EXPLICIT   
      ) 

SELECT @DATA 
GO 

當我執行此查詢正在以下錯誤 消息1086，15級，狀態1，過程BILLING_RESPONSE，行22 FOR XML子句在包含set運算符時在視圖，內聯函數，派生表和子查詢中無效。要解決此問題，請使用派生表語法來包裝包含set操作符的SELECT，然後在其上應用FOR XML。

Answer 1

如果是這樣，則不需要@Data變量。讓你的sp直接返回查詢結果，你就完成了。

CREATE PROCEDURE BILLING_RESPONSE AS 
SELECT 

     1 AS Tag, 
     NULL AS Parent, 
     NULL AS 'CallTransactions!1!', 
     NULL AS 'TCALTRS!2!TRS_DAT_TE!cdata', 
     NULL AS 'TCALTRS!2!TRS_CRT_DT!Element' 
    UNION ALL 
    SELECT 
     2 AS Tag, 
     1 AS Parent, 
     NULL, 
     TRS_DAT_TE, 
     TRS_CRT_DT 
    FROM TCALTRS 
    WHERE TRS_CRT_DT between CONVERT(date,GETDATE()-1) and CONVERT(date,getdate()) and 
    TRS_DAT_TE like '%(Submit Response)%' 
    FOR XML EXPLICIT 

Answer 2

的錯誤不是特別清楚，但它的意思是，因爲它包含了UNION（一種集合運算符），你不能使用內聯子查詢FOR XML條款

的建議的解決方法是將子查詢包裝爲其他內容並單獨調用它，例如：

CREATE PROCEDURE BILLING_RESPONSE 
AS DECLARE @Data AS XML 

;WITH DATA AS(
       SELECT 
       1 AS Tag, 
       NULL AS Parent, 
       NULL AS 'CallTransactions!1!', 
       NULL AS 'TCALTRS!2!TRS_DAT_TE!cdata', 
       NULL AS 'TCALTRS!2!TRS_CRT_DT!Element' 
      UNION ALL 
      SELECT 
       2 AS Tag, 
       1 AS Parent, 
       NULL, 
       TRS_DAT_TE, 
       TRS_CRT_DT 
      FROM TCALTRS 
      WHERE TRS_CRT_DT between CONVERT(date,GETDATE()-1) and CONVERT(date,getdate()) and 
      TRS_DAT_TE like '%(Submit Response)%' 
      FOR XML EXPLICIT   
      ) 
SELECT @Data = (SELECT * FROM DATA FOR XML EXPLICIT) 
SELECT @DATA 
GO