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How do I parse an xml string send to a SP

Posted on 2004-03-25
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Last Modified: 2007-12-19
Hi Experts,

ASP receives an HTTP post with an XML string in it. ASP sends this string to a SP in SQL Server.

Now how do I instantia an XMLdocument COM object in SQL server and traverse the XML document.

Regards,

Fouad Daniels
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Question by:FouadDaniels
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9 Comments
 

Author Comment

by:FouadDaniels
ID: 10675749
The server is remotely hosted and the SP i make might not have all the security rights.
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Author Comment

by:FouadDaniels
ID: 10675776
DECLARE @object int
DECLARE @hr int
EXEC @hr = sp_OACreate 'MSXML2.DOMDocument', @object OUT
EXEC @hr = sp_OAMethod @object, 'LoadXML', '<Root><Node></Node><Node></Node></Root>'

DECLARE @property varchar(255)
EXEC @hr = sp_OAGetProperty @object, 'nodeName', @property OUT
PRINT @property

EXEC @hr = sp_OADestroy @object

But how do I traverse the documentElement.childNodes?
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Expert Comment

by:Hilaire
ID: 10675806
Hi FouadDaniels

>>how do I instantia an XMLdocument COM object in SQL server and traverse the XML document<<
The following code should help

I once copied it from another thread, and successfully used at my own site
I would have prefered to post a link to the initial question, but the search engine couldn't find it, and I haven't bookmarked it.

CREATE FUNCTION [dbo].[SomeFunction] (@Xml TEXT, @XPath VARCHAR(8000))  
RETURNS VARCHAR(8000)
BEGIN

     DECLARE @intNodeCount      INTEGER
     DECLARE @intDocRef      INTEGER
     DECLARE @intOut           INTEGER
     DECLARE @Return      INTEGER
     DECLARE @SelectResult      VARCHAR(8000)

     EXECUTE @intOut = sp_OACreate 'MSXML2.DOMDocument', @intDocRef OUT

     EXECUTE @intOut = sp_OAMethod @intDocRef, 'LoadXML', @Return OUT, @Xml
     EXECUTE @intOut = sp_OASetProperty @intDocRef, 'SelectionLanguage', 'XPath'
     EXECUTE @intOut = sp_OAMethod @intDocRef, 'selectSingleNode', @Return OUT, @XPath

     EXECUTE @intOut = sp_OAGetProperty @Return, 'Text', @SelectResult OUT
     EXECUTE @intOut = sp_OADestroy @intDocRef

     RETURN @SelectResult
END
go

SELECT dbo.SomeFunction('<EXAMPLE><CUSTOMER id="1" type="B">Jones</CUSTOMER><CUSTOMER id="2" type="C">Johnson</CUSTOMER></EXAMPLE>', '/EXAMPLE/CUSTOMER[. ="Jones"]')

Please be aware that I'm not the author of this code, so hopefully the one who deserves recognition for this code will read this post and participate

HTH

Hilaire
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Author Comment

by:FouadDaniels
ID: 10675850
But how do I traverse the childNodes.

SPEUDO CODE:

FOR EACH NODE IN @intDocRef.documentElement.childNodes
    do something with the node
Next NODE
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LVL 26

Accepted Solution

by:
Hilaire earned 500 total points
ID: 10676481
This time the code's mine
It uses another method to loop through the nodes

CREATE FUNCTION [dbo].[AnotherFunction] (@Xml TEXT, @tag VARCHAR(50))  
RETURNS VARCHAR(8000)
BEGIN

     DECLARE @intNodeCount      INTEGER
     DECLARE @intDocRef      INTEGER
     DECLARE @intNodeList      INTEGER
     DECLARE @intNode      INTEGER

     DECLARE @intOut           INTEGER
     DECLARE @Return      INTEGER
     DECLARE @SelectResult      VARCHAR(8000)
     DECLARE @NodeText varchar(1000)
     declare @i int

     set @SelectResult = ''

     EXECUTE @intOut = sp_OACreate 'MSXML2.DOMDocument', @intDocRef OUT
     -- load file
     EXECUTE @intOut = sp_OAMethod @intDocRef, 'LoadXML', @Return OUT, @Xml
     -- loop through nodes of a given type (@tag parameter)
     EXECUTE @intOut = sp_OAMethod @intDocRef, 'getElementsByTagName', @intNodeList OUT, @tag
     -- get nodecount
     EXECUTE @intOut = sp_OAGetProperty @intNodeList, 'length', @intNodeCount OUT
     set @i = 0
     while @i < @intNodeCount
     begin
          -- get a pointer to each node
          EXECUTE @intOut = sp_OAMethod @intNodeList, 'nextNode', @intNode OUT
          -- get node properties
          EXECUTE @intOut = sp_OAGetProperty @intNode, 'Text', @nodetext OUT
          select @SelectResult = @SelectResult + '-' + @nodetext, @i = @i + 1
     end
     EXECUTE @intOut = sp_OADestroy @intDocRef

     RETURN @SelectResult
END

go

SELECT dbo.SomeFunction('<EXAMPLE><CUSTOMER id="1" type="B">Jones</CUSTOMER><CUSTOMER id="2" type="C">Johnson</CUSTOMER></EXAMPLE>', 'CUSTOMER')


This sample code could be used for any other purpose like loading a table,
I think you get the idea how to loop through nodes and get their properties

Hilaire
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LVL 26

Expert Comment

by:Hilaire
ID: 10677059
Typo in the post above (guess you had noticed)
To test , use
SELECT dbo.AnotherFunction('<EXAMPLE><CUSTOMER id="1" type="B">Jones</CUSTOMER><CUSTOMER id="2" type="C">Johnson</CUSTOMER></EXAMPLE>', 'CUSTOMER')
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LVL 75

Expert Comment

by:Anthony Perkins
ID: 10677628
What exactly are you trying to achieve?  Have you looked at the OpenXML function?
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LVL 26

Expert Comment

by:Hilaire
ID: 10704895
Hi FouadDaniels,
did my code help a bit ?

I didn't mention OPENXML because It won't be able to parse complicated XML trees, or simple XML trees with recursive structure ( eg when one <Element> tag can include one or more <Element> tags)

But, as Anthony suggested, it's definitely better than creating activeX objects if the file structure allows its usage.

Cheers

Hilaire
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Author Comment

by:FouadDaniels
ID: 10704969
I am not at work now. tomorow all come back on this. sorry for the delay.

Regards,
Fouad Daniels
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