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SQL Server Examples

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(SQL Server) Iterate over Direct Children with a Specific Tag

Demonstrates how to iterate over direct children having a specific tag.

The input XML, available at http://www.chilkatsoft.com/data/fruit.xml, is this:

<root>
    <fruit color="red">apple</fruit>
    <fruit color="green">pear</fruit>
    <veg color="orange">carrot</veg>
    <meat animal="cow">beef</meat>
    <xyz>
        <fruit color="blue">blueberry</fruit>
        <veg color="green">broccoli</veg>
    </xyz>
    <fruit color="purple">grape</fruit>
    <cheese color="yellow">cheddar</cheese>
</root>

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
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @sTmp1 nvarchar(4000)
    DECLARE @xml int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.Xml', @xml OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    DECLARE @child int

    DECLARE @numWithTag int

    DECLARE @i int

    DECLARE @success int

    -- The sample input XML is available at http://www.chilkatsoft.com/data/fruit.xml
    EXEC sp_OAMethod @xml, 'LoadXmlFile', @success OUT, 'fruit.xml'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @xml, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @xml
        RETURN
      END

    --  Get the number of direct children having the tag "fruit"
    EXEC sp_OAMethod @xml, 'NumChildrenHavingTag', @numWithTag OUT, 'fruit'

    IF @numWithTag > 0
      BEGIN

        SELECT @i = 0
        WHILE @i <= @numWithTag - 1
          BEGIN
            EXEC sp_OAMethod @xml, 'GetNthChildWithTag', @child OUT, 'fruit', @i

            EXEC sp_OAGetProperty @child, 'Tag', @sTmp0 OUT

            EXEC sp_OAGetProperty @child, 'Content', @sTmp1 OUT
            PRINT @i + ': ' + @sTmp0 + ' : ' + @sTmp1
            EXEC @hr = sp_OADestroy @child

            SELECT @i = @i + 1
          END

        PRINT '-----'

        -- Do the same as the above loop, but instead of creating
        -- a new object instance for each child, call GetNthChildWithTag2 to
        -- update the object's reference instead.
        SELECT @i = 0
        WHILE @i <= @numWithTag - 1
          BEGIN
            -- Navigate to the Nth child.  
            EXEC sp_OAMethod @xml, 'GetNthChildWithTag2', @success OUT, 'fruit', @i

            EXEC sp_OAGetProperty @xml, 'Tag', @sTmp0 OUT

            EXEC sp_OAGetProperty @xml, 'Content', @sTmp1 OUT
            PRINT @i + ': ' + @sTmp0 + ' : ' + @sTmp1
            -- Navigate back up to the parent:
            EXEC sp_OAMethod @xml, 'GetParent2', @success OUT
            SELECT @i = @i + 1
          END

        PRINT '-----'
      END

    EXEC @hr = sp_OADestroy @xml


END
GO

 

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