Re: [basex-talk] Fwd: Re: using apply-function within an updating function

[Christian Grün]

Hi Rob,

the official XQuery functions are limited to non-updating function
arguments. Enabling MIXUPDATES is the only way out, because you would
otherwise be able to write code that is both updating and
non-updating:

  for $f in (db:output#1, count#1)
  return apply($f, [1])

Hope this helps,
Christian



On Wed, Aug 30, 2017 at 7:37 AM, Rob Stapper <r.stap...@lijbrandt.nl> wrote:
> Hi Michael and Marco,
>
> Thanx for the feedback.
>
> @Marco, setting MIXUPDATES is an efficient work around for suppressing the 
> error message but the cost is that you lose the updating-checks completely.  
> Updating-checks are very useful.
> @Michael, I'll dive into the XQUF 3.0. Sounds interesting.
>
> Fact stays that the updating check doesn't work, as I see it, properly on the 
> apply-function. Something for Christian to dive into when he is back on 
> holidays ;-)
>
> Again thanx for the replies.
>
> Have fun,
>
> Rob
>
>
> -Oorspronkelijk bericht-
> Van: basex-talk-boun...@mailman.uni-konstanz.de 
> [mailto:basex-talk-boun...@mailman.uni-konstanz.de] Namens Michael Seiferle
> Verzonden: dinsdag 29 augustus 2017 21:08
> Aan: Marco Lettere
> CC: basex-talk@mailman.uni-konstanz.de
> Onderwerp: Re: [basex-talk] Fwd: Re: using apply-function within an updating 
> function
>
> Hi Rob,
> hi Marco,
>
>
> First: sorry for not coming back to you earlier.
>
> Glad it worked using mixupdates, but I think there might be a way to make it 
> work using the new XQUF 3.0 "invoke updating" capabilities  :-) Christian is 
> currently on holiday, I am sure he will report back on this.
>
>
> Best from Konstanz,
>
> Michael
>
> Von meinem iPhone gesendet
>
>> Am 29.08.2017 um 15:17 schrieb Marco Lettere <m.lett...@gmail.com>:
>>
>> Hi Rob,
>> I suppose that if you add MIXUPDATES=true below #LOCAL OPTIONS in the .basex 
>> file that you will find in your basex install directory and restart your 
>> GUI, the error will not show up any longer in the GUI itself.
>> Regards,
>> Marco.
>>
>>> On 29/08/2017 15:07, r.stap...@lijbrandt.nl wrote:
>>> 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.stap...@lijbrandt.nl
>>> Ontvanger: Michael Seiferle <m...@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
>

Re: [basex-talk] Fwd: Re: using apply-function within an updating function

[Rob Stapper]

Hi Michael and Marco,

Thanx for the feedback.

@Marco, setting MIXUPDATES is an efficient work around for suppressing the 
error message but the cost is that you lose the updating-checks completely.  
Updating-checks are very useful.
@Michael, I'll dive into the XQUF 3.0. Sounds interesting.

Fact stays that the updating check doesn't work, as I see it, properly on the 
apply-function. Something for Christian to dive into when he is back on 
holidays ;-)

Again thanx for the replies.

Have fun,

Rob


-Oorspronkelijk bericht-
Van: basex-talk-boun...@mailman.uni-konstanz.de 
[mailto:basex-talk-boun...@mailman.uni-konstanz.de] Namens Michael Seiferle
Verzonden: dinsdag 29 augustus 2017 21:08
Aan: Marco Lettere
CC: basex-talk@mailman.uni-konstanz.de
Onderwerp: Re: [basex-talk] Fwd: Re: using apply-function within an updating 
function

Hi Rob,
hi Marco,


First: sorry for not coming back to you earlier.

Glad it worked using mixupdates, but I think there might be a way to make it 
work using the new XQUF 3.0 "invoke updating" capabilities  :-) Christian is 
currently on holiday, I am sure he will report back on this. 


Best from Konstanz,

Michael

Von meinem iPhone gesendet

> Am 29.08.2017 um 15:17 schrieb Marco Lettere <m.lett...@gmail.com>:
> 
> Hi Rob,
> I suppose that if you add MIXUPDATES=true below #LOCAL OPTIONS in the .basex 
> file that you will find in your basex install directory and restart your GUI, 
> the error will not show up any longer in the GUI itself.
> Regards,
> Marco.
> 
>> On 29/08/2017 15:07, r.stap...@lijbrandt.nl wrote:
>> 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.stap...@lijbrandt.nl
>> Ontvanger: Michael Seiferle <m...@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:
>>> 
>>

Re: [basex-talk] Fwd: Re: using apply-function within an updating function

[Michael Seiferle]

Hi Rob,
hi Marco,


First: sorry for not coming back to you earlier.

Glad it worked using mixupdates, but I think there might be a way to make it 
work using the new XQUF 3.0 "invoke updating" capabilities  :-)
Christian is currently on holiday, I am sure he will report back on this. 


Best from Konstanz,

Michael

Von meinem iPhone gesendet

> Am 29.08.2017 um 15:17 schrieb Marco Lettere :
> 
> Hi Rob,
> I suppose that if you add MIXUPDATES=true below #LOCAL OPTIONS in the .basex 
> file that you will find in your basex install directory and restart your GUI, 
> the error will not show up any longer in the GUI itself.
> Regards,
> Marco.
> 
>> On 29/08/2017 15:07, r.stap...@lijbrandt.nl wrote:
>> 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.stap...@lijbrandt.nl
>> Ontvanger: Michael Seiferle 
>> Kopie: BaseX 
>> 
>> 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-invocation
>>>  
>>> 
 Am 28.08.2017 um 16:42 schrieb r.stap...@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
 )
 } ;
> 
>