xmlTreeQuickXPath

Extracts information from an XML document.

xmlTreeQuickXPath(string xmlRaw, string xpathQuery
        [, string[] xmlns)

Parameters:

xmlRaw - the plain text of the xml document you want to extract information from
xpathQuery - the XPath expression that identifies the nodes you want to extract the data from
xmlns (optional) - an array of prefix=URI namespaces to use in the XPath query

Returns:

String values of the node from the XML document xmlRaw that match xpathQuery

xmlTreeQuickXPath allows you to easily extract information from an XML document in a one-shot function. It is intended to be used in SQL statements to extract specific information from a field that contains XML data.

It is essentially a one statement version of the following:

<$doc = (xmlTreeNewDocFromString($xmlRaw))>
    <$xpath = (xmlTreeNewXPath($doc))>
    <$nodes = (xmlTreeXPathExecute($xpathQuery))>
    <loop $nodes>
        <$ret = (xmlTreeGetAllContent($nodes))>
        <$content = $content $ret>
    </loop>

EXAMPLE
if the xmlData field of a table has content like this:

<extraInfo>
    <price>8.99</price>
    <author>John Doe</author>
    <isbn>978-0-06-051280-4</isbn>
</extraInfo>

Then the following SQL statement will match that row:

SELECT * from myTable where xmlTreeQuickXPath(data,
'/extraInfo/author') = 'John Doe'