Re: XUpate exception in september snapshots

Hi,

this is not really an XUpdate error, but an error in the number() function: 
contrary to the XQuery functions spec, number() does currently not work 
without an argument. You can rewrite the expression as follows:

{number(document('/db/rep1/ids.xml')/ids) + 1}

> Hi, I am experiencing a problem with the two september snapshots: I
> have a query that also performs an XUptade. Its goal is to generate
> unique numbers that I use for putting ids to xml nodes.
> I have an ids.xml file that contains something like: <ids>100</ids>.
> And here is the request:
> xquery version "1.0";
> declare namespace xmldb="http://exist-db.org/xquery/xmldb";;
> let $root := xmldb:collection('xmldb:exist:///db/rep1', 'admin', '')
> let $id := document('/db/rep1/ids.xml')/ids
> let $mods := xmldb:update(
>       $root,
>       <xu:modifications version="1.0" xmlns:xu="http://www.xmldb.org/xupdate";>
>               <xu:update select="document('/db/rep1/ids.xml')/ids">
>                       {document('/db/rep1/ids.xml')/ids/number()+1}
>               </xu:update>
>       </xu:modifications>)
> return <result id="{$id}"/>

> I also would like to know if there is a better way to generate unique
> ids, I mean something automatic and thread-safe as sequences in SQL?

I think this would be a good candidate for an extension function.

Wolfgang


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