Problems with logical data service

Question

This is related to thread 837141 (Problems creating physical data service to relational table)
I have been able to create the logical data service that uses the physical service (mentioned above).
However when I try to create a library function to update (shown below)
declare function lper:update($new as element(per:Persistance2)) as xs:boolean {*
* let $changed :=*
* for $n in $new*
* let $old := lper:read($new/Project, $ew/Property)*
* return*
* fn-bea:replace-value(fn-bea:changed-element($old), "Value", $n/Value)*
_let $return := {color:#ff0000}pper:update{color}($changed)_*
* return fn:true()*
WorkSpace Studio gives the following error (for the line underlined above, and the function in red)
*{bea-err}FUNC002: Illegal use of side-effect procedure {ld:Physical/Persistance2}update with arity 1. Side-effect procedures cannot be invoked from a side-effect free context*
Any idea why?

Answer 1

functions, by definition, do not have side-effects. So calling something that had a side-effect (procedure) is not allowed.
You need to create a library procedure.
Your
declare function lper:update($new as element(per:Persistance2)) as xs:boolean {*
needs to be
declare procedure lper:update($new as element(per:Persistance2)) as xs:boolean {*
- mike
Edited by: mikereiche on Dec 12, 2008 5:10 PM