(SQL Server) Remove an XML Subtree

Demonstrates how to remove an XML subtree from an XML document.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

-- Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @xml int
    -- Use "Chilkat_9_5_0.Xml" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.Xml', @xml OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    DECLARE @success int
    EXEC sp_OAMethod @xml, 'LoadXmlFile', @success OUT, 'qa_data/xml/osszes.xml'

    -- The XML file we're loading contains this:

    -- <?xml version="1.0" encoding="iso-8859-2" ?>
    -- <EXAMPLE>
    --     <OSSZES>
    --         <ROW TYPE="INS">477953
    --             <NUMBER>05107003972</NUMBER>
    --         </ROW>
    --         <ROW TYPE="INS">477954
    --             <NUMBER>05107001342</NUMBER>
    --         </ROW>
    --         <ROW TYPE="INS">477955
    --             <NUMBER>05107001342</NUMBER>
    --         </ROW>
    --         <ROW TYPE="INS">477956
    --             <NUMBER>05107000017</NUMBER>
    --         </ROW>**
    --         <ROW TYPE="INS">477957
    --             <NUMBER>05107002182</NUMBER>
    --         </ROW>
    --     </OSSZES>
    -- </EXAMPLE>
    -- 

    -- We wish to remove this subtree:

    -- <ROW TYPE="INS">477956
    --     <NUMBER>05107000017</NUMBER>
    -- </ROW>

    -- Get another reference to the XML document.
    DECLARE @xml2 int
    EXEC sp_OAMethod @xml, 'GetSelf', @xml2 OUT

    -- Navigate to the node that is the root of the subtree to be deleted.
    -- In this case, we wish to find the node having tag "ROW" with content "477956"
    DECLARE @notUsed nvarchar(4000)
    EXEC sp_OAMethod @xml2, 'ChilkatPath', @notUsed OUT, 'OSSZES|/C/ROW,*477956*|$'

    -- Examine the xml2, it should be just the subtree.
    EXEC sp_OAMethod @xml2, 'GetXml', @sTmp0 OUT
    PRINT @sTmp0

    -- Now detach xml2 from the it's XML document.
    -- xml2 will now be it's own XML document.
    EXEC sp_OAMethod @xml2, 'RemoveFromTree', NULL

    -- Examine our original XML document.  The subtree is removed:
    EXEC sp_OAMethod @xml, 'GetXml', @sTmp0 OUT
    PRINT @sTmp0

    EXEC @hr = sp_OADestroy @xml2


    EXEC @hr = sp_OADestroy @xml


END
GO