sql-server - 将 XML 显式查询设置为变量

Question

我需要在 SQL 中生成以下 XML 字符串并将其分配给一个变量。

<List>
   <V Value="TESt">
       <Target a="10" b="11"/>
   </V>
   <T Value="TESt1">
       <Target a="100" b="101"/>
   </V>
</List>

因此，我编写了以下 SQL 代码:

;WITH XML_CTE AS
(
SELECT 
    1 AS TAG,
    NULL AS Parent,
    UT.title AS [v!1!Value],
    null AS [Target!2!a],
    null AS [Target!2!b]
FROM 
(
    select  
        10 AS A,
        11 AS B,
        'TESt' as title
    union
        select  
        100 AS a,
        101 AS b,
        'TESt1' as title
)UT
UNION ALL
SELECT
    2,
    1,
    UT.title AS Value,
    ut.a,
    ut.b
FROM
(
    select  
        10 AS a,
        11 AS b,
        'TESt' as title
    union
        select  
        100 AS a,
        101 AS b,
        'TESt1' as title
)ut
)
SELECT * FROM XML_CTE 
ORDER BY 
    [V!1!Value], 
[Target!2!a]
FOR XML EXPLICIT, ROOT('List')

但是如何将它分配给 xml(或 nvarchar)变量？由于“UNION ALL”，我必须将其包装在 CTE 中，但是将其放在 CTE 中，我无法将其分配给变量。

Answer 1

您可以将 SELECT * FROM XML_CTE... 语句更改为以下内容

SELECT @MyVariable = 
    (SELECT * FROM XML_CTE 
    ORDER BY 
        [V!1!Value], 
    [Target!2!a]
    FOR XML EXPLICIT, ROOT('List')
    )