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Can someone algorithmically explain this TSQL UDF with XML?

Posted on 2012-04-11
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Last Modified: 2012-08-14
Can someone please provide an algorithmic description of what this TSQL UDF is doing? I am not familiar with XML for TSQL.

FUNCTION [Common].[XmlArrayOfInt]

(@Xml AS XML (Common.ArrayOfIntegersSchema))

RETURNS @Result TABLE (Value INT NOT NULL)

AS

BEGIN
      INSERT INTO @Result(Value)
      SELECT T.c.value('.','int') AS Value
      FROM @Xml.nodes('/ArrayOfInt/int') AS T(c)
      RETURN
END

Also are value and nodes built-in TSQL functions? And what is '/ArrayOfInt/int'?

Thanks!
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Question by:pae2
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1 Comment
 
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Accepted Solution

by:
Robert Schutt earned 2000 total points
ID: 37834841
To start at the end: '/ArrayOfInt/int' is an xpath query with which you can select parts of an xml document. This one just selects all 'int' nodes under the root node 'ArrayOfInt' but it can contain a lot more complicated queries in itself.

Given an xml document as input, this function returns a table that contains all values in the 'int' nodes.

So given this xml document:

<ArrayOfInt>
  <int>6</int>
  <int>12</int>
  <int>7</int>
</ArrayOfInt>

Open in new window


It would return:

Value
-----
    6
   12
    7

Open in new window


Yes, @Xml.nodes and T.c.value are built-in functions to work with xml data. See for more info under the heading 'Methods on XML Data Type' at this page: http://msdn.microsoft.com/en-us/library/ms345117(v=sql.90).aspx#sql2k5xml_topic3
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