Question

Say I have the following documents in my database: a_doc1, a_doc2, b_doc1, and b_doc2

All these documents are of the following format

<doc>
  ....
  <updatedTime>2011-02-07T14:41:02.133-05:00</updatedTime>
  ....
</doc

>

The value of the “updatedTime” element is inserted when the document is created using the fn:current-dateTime()

Now I am trying to do the following:

1. find all documents whose name starts with “a_”
2. order these documents by their <updatedTime> element in descending order
3. Return the first document name from the descending order

I tried the following:

for $doc_name in db:list()
  where fn:starts-with($doc_name, 'a_')
    order by xs:dateTime(doc($doc_name)/updatedTime) descending
      return $doc_name

Say “a_doc1” is created at “2011-02-07T14:40:00.78-05:00” and “a_doc2” is created at “2011-02-07T14:41:02.133-05:00”, the desired output is a_doc2. In short the document name(starting with a_) of the most recent document created must be returned.

When I try my sample code, the output returned is : [a_doc1, a_doc2].
The expected output is: [a_doc2, a_doc1].

Thanks,
Sony

Answer 1

order by dateTime(doc($doc_name)/updatedTime/text())

Instead of this use:

order by xs:dateTime(doc($doc_name)/updatedTime)