Question

I am using DBIx::Class and I would like to only update one row in my table. Currently this is how I do it:

my $session = my_app->model("DB::Session")->find(1);    
$session->update({done_yn=>'y',end_time=>\'NOW()'});

It works, but the problem is that when it does find to find the row, it does this whole query:

SELECT me.id, me.project_id, me.user_id, me.start_time, me.end_time, me.notes, me.done_yn FROM sessions me WHERE ( me.id = ? ): '8'

Which seems a bit much when all I want to do is update a row. Is there anyway to update a row without having to pull the whole row out of the database first? Something like this is what I am looking for:

my_app->model("DB::Session")->update({done_yn=>'y',end_time=>\'NOW()'},{id=>$id});

Where $id is the WHERE id=? part of the query. Does anyone know how to do this? Thanks!

Answer 1

You can run update on a restricted resultset which only matches this single row:

my_app->model("DB::Session")->search_rs({ id=> 1 })->update({done_yn=>'y',end_time=>\'NOW()'});

I suggest you use a DateTime->now object instead of literal SQL for updating the end_time column because it uses the apps servers date and time instead of the database servers and makes your schema more compatible with different RDBMSes.