[Dbix-class] DBIx HAVING and COUNT error

[Dmitry L.]

HAVING COUNT(1) = 3
vs
HAVING count 1 = 1

On 5 September 2016 at 06:13, Rajeev Prasad <rp.neuli at yahoo.com> wrote:
> hello all,
>
> thanks for response. sorry if i sent email directly to you. (i think i just
> did a replay all)
>
> i tried that and many other way, but i am going crazy that it just wont
> work????
>
> SQL I 'hope' to implement is:
>
> SELECT *
> FROM itemlist
> WHERE t_id IN (1,2,3)
> GROUP BY i_id
> HAVING COUNT(1) = 3
>
>
> CODE:................
> $tStr is 55  (has only one element)
> $tCount = 1   (no. of items above.)
>
>> my $obj_rs = $schema->resultset('itemList')->serach(
>>                { t_id => { -in => [ $tStr ] }},
>>                {
>>                    group_by => [ qw(i_id) ],
>>                    having => { 'count 1' => $tCount },
>>                }
>>            );
>
>
> i get this error:
>
>  [cgi:error] [pid 772] [client ....] AH01215:
> DBIx::Class::Storage::DBI::_dbh_execute(): DBI Exception: DBD::mysql::st
> execute failed: You have an error in your SQL syntax; check the manual that
> corresponds to your MySQL server version for the right syntax to use near '1
> = '1'' at line 1 [for Statement "SELECT me.t_id, me.i_id FROM itemList me
> WHERE ( t_id IN ( ? ) ) GROUP BY o_id HAVING count 1 = ?" with ParamValues:
> 0='55', 1=1] at /var/ww...
>
>
> which i guess converts to:
>
> SELECT me.i_id, me.t_id FROM itemList me
> WHERE ( t_id IN ( 55 ) )
> GROUP BY i_id
> HAVING count 1 = 1
>
>  what is wrong in this SQL??..... (I am assuming that by now DBIx syntax is
> good)
>
>
>
>
> On Saturday, September 3, 2016 4:17 AM, Stefan Hornburg (Racke)
> <racke at linuxia.de> wrote:
>
>
> On 09/03/2016 03:38 AM, Rajeev Prasad wrote:
>> DBIx error in webserver log:
>>
>> [cgi:error] [pid 29640] ... AH01215: Can't locate object method "HAVING"
>> via package "COUNT" (perhaps you forgot to load
>> "COUNT"?)
>>
>>
>> the query:
>>
>> my $obj_rs = $schema->resultset('itemList')->serach(
>>                { t_id => { -in => [ $tStr ] }},
>>                {
>>                    group_by => [ qw(i_id) ],
>>                    HAVING COUNT('t_id') = $tCount
>>                }
>>            );
>>
>>
>> currently database has no records which match the query. but i was not
>> expecting such an error.
>>
>> what is wrong in my statement?
>
> You can't just drop in literal SQL like that and expect it to work - because
> Perl now assumes
> "HAVING COUNT" being Perl code. I suppose "use strict; use warnings" would
> have alerted you of
> that.
>
> It is possible to you use literal SQL with DBIx::Class, please refer to the
> docs.
>
> I would suggest a different approach - using subqueries. Please take a look
> at the excellent
> advent calendar post from fREW:
>
> http://www.perladvent.org/2012/2012-12-21.html
>
> This is still accurate.
>
> I covered a few use cases in my presentation at the Alpine Perl Workshop:
>
> https://www.linuxia.de/talks/alpine2016/dbic-pr-en-beamer.pdf
>
> Regards
>         Racke
>
>>
>> thank you.
>> Rajeev
>>
>>
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>>
>
>
> --
> Ecommerce and Linux consulting + Perl and web application programming.
>
>
>
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>
>
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-- 
//wbr, Dmitry L.