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Matthew O'Brien

Subject: it's possible to have a where clause with variables?
Author: Matthew O'Brien
Date: 09 May 2007 12:59 PM

hi all,
i'll show you my problem!

it's possible to replace something like this:

for $a in doc( '/db/tesi/UtentiIstanza.xml' )/utenti/utente
where $a/credenziali/unacredenziale[nomecredenziale='CI']/residenza='Milano'
return $a/id

with something like this:

let $expcred := "credenziali/unacredenziale[nomecredenziale='CI']/residenza='Milano'"
for $a in doc( '/db/tesi/UtentiIstanza.xml' )/utenti/utente
where $a/$expcred
return $a/id

the first example works,the second no,how can i do?
I need to use this in a function and $expcred is one of my parameters

thanks a lot for your help
Matthew

_______________________________________
this is my XML

<utenti >
<utente>
<id>0</id>
<username>admin</username>
<password>admin</password>
<credenziali/>
</utente>
<utente>
<id>1</id>
<username>teyo</username>
<password>qwerty</password>
<credenziali>
<unacredenziale>
<nomecredenziale>CI</nomecredenziale>
<cognome>O'Brien</cognome>
<nome>Matthew</nome>
<residenza>Milano</residenza>
<professione>studente</professione>
</unacredenziale>
<unacredenziale>
<nomecredenziale>BIB</nomecredenziale>
<cognome>O'Brien</cognome>
<nome>Matthew</nome>
<numerotessera>MI12345</numerotessera>
</unacredenziale>
</credenziali>
</utente>
</utenti>

(Deleted User)

Subject: it's possible to have a where clause with variables?
Author: (Deleted User)
Date: 11 May 2007 08:38 AM

Hi Matthew,
what you want to do is not possible, unless you use a non-standard function that lets you evaluate a query at runtime (e.g. with Saxon, it's saxon:eval)

Hope this helps,
Alberto

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