SQL SERVER FOR XML EXPLICIT

Question

我希望将SELECT FOR XML EXPLICIT语句的结果赋给一个XML变量，例如

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

当我执行此查询时，收到以下错误消息1086，级别15，状态1，过程BILLING_RESPONSE，第22行FOR XML子句在视图、内联函数、派生表和子查询中无效，因为它们包含集合运算符。要解决这个问题，可以使用派生表语法包装包含集运算符的SELECT，并在其上应用于XML。

Answer 1

如果就是这样，就不需要@Data变量了。让你的sp直接返回查询的结果，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

错误不是特别清楚，但它说明您不能在内联子查询中使用FOR XML子句，因为它包含UNION (一种集运算符)

建议的解决方法是将子查询包装在其他内容中，然后单独调用它，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