sql 一种表值函数，可将XML转换为表。感谢http://stackoverflow.com/questions/2266132/how-can-i-get-a-list-of-element

Posted 2021-05-14

CREATE FUNCTION dbo.fnu_XML_ToTable(@x XML)  
RETURNS TABLE 
AS RETURN 
with cte as (
	SELECT 
			1 AS lvl,  
			x.value('local-name(.)','NVARCHAR(MAX)') AS Name,  
			CAST(NULL AS NVARCHAR(MAX)) AS ParentName, 
			CAST(1 AS INT) AS ParentPosition, 
			CAST(N'Element' AS NVARCHAR(20)) AS NodeType,  
			x.value('local-name(.)','NVARCHAR(MAX)') AS FullPath,  
			x.value('local-name(.)','NVARCHAR(MAX)')  
			+ N'[' 
			+ CAST(ROW_NUMBER() OVER(ORDER BY (SELECT 1)) AS NVARCHAR)  
			+ N']' AS XPath,  
			ROW_NUMBER() OVER(ORDER BY (SELECT 1)) AS Position, 
			x.value('local-name(.)','NVARCHAR(MAX)') AS Tree,  
			x.value('text()[1]','NVARCHAR(MAX)') AS Value,  
			x.query('.') AS this,         
			x.query('*') AS t,  
			CAST(CAST(1 AS VARBINARY(4)) AS VARBINARY(MAX)) AS Sort,  
			CAST(1 AS INT) AS ID  
	FROM @x.nodes('/*') a(x)  
	UNION ALL 
	SELECT 
			p.lvl + 1 AS lvl,  
			c.value('local-name(.)','NVARCHAR(MAX)') AS Name,  
			CAST(p.Name AS NVARCHAR(MAX)) AS ParentName, 
		CAST(p.Position AS INT) AS ParentPosition, 
			CAST(N'Element' AS NVARCHAR(20)) AS NodeType,  
			CAST(p.FullPath + N'/' + c.value('local-name(.)','NVARCHAR(MAX)') AS NVARCHAR(MAX)) AS FullPath,  
			CAST(p.XPath + N'/'+ c.value('local-name(.)','NVARCHAR(MAX)')+ N'['+ CAST(ROW_NUMBER() OVER(PARTITION BY c.value('local-name(.)','NVARCHAR(MAX)') 
			ORDER BY (SELECT 1)) AS NVARCHAR)+ N']' AS NVARCHAR(MAX)) AS XPath,  
			ROW_NUMBER() OVER(PARTITION BY c.value('local-name(.)','NVARCHAR(MAX)')
			ORDER BY (SELECT 1)) AS Position, 
			CAST( SPACE(2 * p.lvl - 1) + N'|' + REPLICATE(N'-', 1) + c.value('local-name(.)','NVARCHAR(MAX)') AS NVARCHAR(MAX)) AS Tree,  
			CAST( c.value('text()[1]','NVARCHAR(MAX)') AS NVARCHAR(MAX) ) AS Value, c.query('.') AS this,  
			c.query('*') AS t,  
			CAST(p.Sort + CAST( (lvl + 1) * 1024 + (ROW_NUMBER() OVER(ORDER BY (SELECT 1)) * 2) AS VARBINARY(4)) AS VARBINARY(MAX) ) AS Sort,  
			CAST((lvl + 1) * 1024 + (ROW_NUMBER() OVER(ORDER BY (SELECT 1)) * 2) AS INT)  
	FROM cte p  
	CROSS APPLY p.t.nodes('*') b(c)), cte2 AS (  
												SELECT 
												lvl AS Depth,  
												Name AS NodeName,  
												ParentName, 
												ParentPosition, 
												NodeType,  
												FullPath,  
												XPath,  
												Position, 
												Tree AS TreeView,  
												Value,  
												this AS XMLData,  
												Sort, ID  
												FROM cte  
	UNION ALL 
	SELECT 
			p.lvl,  
			x.value('local-name(.)','NVARCHAR(MAX)'),  
			p.Name, 
			p.Position, 
			CAST(N'Attribute' AS NVARCHAR(20)),  
			p.FullPath + N'/@' + x.value('local-name(.)','NVARCHAR(MAX)'),  
			p.XPath + N'/@' + x.value('local-name(.)','NVARCHAR(MAX)'),  
			1, 
			SPACE(2 * p.lvl - 1) + N'|' + REPLICATE('-', 1)  
			+ N'@' + x.value('local-name(.)','NVARCHAR(MAX)'),  
			x.value('.','NVARCHAR(MAX)'),  
			NULL,  
			p.Sort,  
			p.ID + 1  
	FROM cte p  
	CROSS APPLY this.nodes('/*/@*') a(x)  
)  
SELECT 
        ROW_NUMBER() OVER(ORDER BY Sort, ID) AS ID,  
        ParentName, ParentPosition,Depth, NodeName, Position,   
        NodeType, FullPath, XPath, TreeView, Value, XMLData 
FROM cte2

declare @x xml = '<data UniqueID="1" Name="Bob"/><data UniqueID="2" Name="Joan"/>'

select * from dbo.fnu_XML_ToTable(@x)