Hi Michael,
Though the GUI still gives an error onth the use of the apply-function within an updating function, my webservices do work correctly. Just added the MIXUPDATES-option in the web.xml file.
Best Rob.
-------- Oorspronkelijke bericht -------- Onderwerp: Re: [basex-talk] using apply-function within an updating function Datum: 29.08.2017 08:06 Afzender: r.stapper@lijbrandt.nl Ontvanger: Michael Seiferle ms@basex.org Kopie: BaseX basex-talk@mailman.uni-konstanz.de
Hi Michael,
Th point is that I am looking for a generic solution which I thought I had found with the use of the apply-function. Most of my webservices take a record with more than one fieldvalue. By putting the fieldvalues in an json-formatted array on the client side and the use of the apply-function on the serverside, see [1], I thought I had found a nice and clean generic solution. Unfortunately this soultion gives me the error: "Function body must be an updating expression".
The issue is that the error is, in my opinion, falsely triggered by the use of the apply-function within updating function. An updating-error-situation should, in my opinion, be determined based on the function that is called by the apply function. In this case though the apply function calls an updating function, Basex still triggeres an updating error.
I cann't use MIXEDUPDATES because my webservices are in a module.
I really would like to use the apply-function here. What to do?
[1] declare %rest:path("/cFactBank/request/new") %rest:PUT("{$dataRec}") %input:json("format=map")
%updating function _:request.new ( $dataRec as array(*) ) { apply( request:new#6 , $dataRec ) } ;
Greetings, Rob
Michael Seiferle schreef op 28.08.2017 18:20:
Hi Rob,
may I ask what you intented to do? Looks like you expect $dataRec to contain exactly one value, right? At least I think so because you called `db:create#1` in `fn:apply` which implies you expect the array to contain a single value.
To create a single database use:
db:create($dataRec => array:get(1))…or… if you want to create a database for each of the array values:
for $db in ($dataRec => array:flatten()) (: Flatten array to a sequence :) return db:create($db). (: create one database per array item :)
…and… last but not least, for "Dynamic Updating Function Invocation“[1] you might use:
let $create := db:create#1 for $db in ($dataRec => array:flatten()) return invoke updating $create($db)
I could not wrap my head around using array:for-each(#2) and dynamic updating function invocation; this could make for a more readable solution, but I can not seem to get the syntax right; if we already fully support it at all ;-)
I hope I did not get you all wrong, feel free to ask for more help! ;-)
Best Michael
[1] https://www.w3.org/TR/xquery-update-30/#id-dynamic-updating-function-invocat...
Am 28.08.2017 um 16:42 schrieb r.stapper@lijbrandt.nl:
Hi,
I want to use the apply function within an updating webfunction, see[1] How can this be done?
TIA,
Rob Stapper
[1] declare %rest:path("/cFactBank/dbCreate") %rest:PUT("{$dataRec}") %input:json("format=map")
%updating function _:cFactBank.dbCreate ( $dataRec as array(*) ) { apply( db:create#1 , $dataRec ) } ;