[Dancer-users] mysterious behavior putting Dancer app in production on Starman

David Precious davidp at preshweb.co.uk
Fri Jul 15 22:48:32 CEST 2011

On Friday 15 July 2011 02:55:55 Mr. Puneet Kishor wrote:
> Here is the interesting thing -- if I add the -D switch to the second app
> as well, it fails to return the polys and the points. It fails with the
> error
> {"error":"Warning caught during route execution: DBD::mysql::st
> fetchall_arrayref failed: fetch() without execute() at
> <path/to>/macrostrat.pm line 79.\n"}
> The offending lines are
> 	71> my $sql = qq{
> 	72> 	..
> 	73>
> 	74>
> 	75> };
> 	76>
> 	77> my $sth = $dbh->prepare($sql);
> 	78> $sth->execute();
> 	79> my $res = $sth->fetchall_arrayref({});
> The above could be just correlation rather than causal, but it definitely
> seems to be a pattern. First, this is bizarre, and why so? And, two...
> this is totally bogus... how can execute() not take place above? Perl
> doesn't have a habit of jumping over lines, does it?

You haven't actually performed any error checking; either make sure RaiseError 
is enabled on your database handle, or check for errors, e.g.:

      or die "Failed to execute query - " . $dbh->errstr;

As for why the behaviour changed when you selected the production environment, 
perhaps it's down to differing settings in enviroments/development.yml and 
environments/production.yml ?

David Precious  ("bigpresh")

   "Programming is like sex. One mistake and you have to support
   it for the rest of your life". (Michael Sinz)

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