(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>

Download Chilkat XML ActiveX

CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @sTmp1 nvarchar(4000)
    DECLARE @xml int
    EXEC @hr = sp_OACreate 'Chilkat.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
        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 STR(@i) + ': ' + @sTmp0 + ' : ' + @sTmp1

            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', NULL, 'fruit', @i


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


            EXEC sp_OAGetProperty @xml, 'Content', @sTmp1 OUT

            PRINT STR(@i) + ': ' + @sTmp0 + ' : ' + @sTmp1
            --  Navigate back up to the parent:
            EXEC sp_OAMethod @xml, 'GetParent2', NULL
            SELECT @i = @i + 1
          END

        PRINT '-----'

      END


END
GO