|Think about Loose Coupling|
My MSSQL query fails the second time.by kyle (Abbot)
|on Apr 30, 2013 at 17:44 UTC||Need Help??|
kyle has asked for the
wisdom of the Perl Monks concerning the following question:
Hello most gracious monks,
I was happily writing a Catalyst app with DBIx::Class when I tripped over some database problem. I haven't been able to pin it down, but I'm pretty sure it has to do with DBD::Sybase used with our MSSQL server.
My original problem is I tried to call ->first on a DBIx::Class::ResultSet twice. That produced the error "DBIx::Class::ResultSet::first(): Unknown error: execute() returned false, but error flags were not set...", which you can find in DBIx::Class::Storage::DBI in sub _dbh_execute.
I have a minimal test using only DBI that demonstrates the problem.
I've obscured the actual connect info. This is what the output looks like:
Note that if you uncomment the SQLite connect info, it works fine. That's why I think this is a problem with my database or driver. You can see a run with SQLite below.
Note also that if I disconnect from the database and reconnect between the queries, they work, but I don't think disconnecting from the database after every query is a very good workaround.
I'd be happy with a workaround for this issue. If I could stick some code in every ResultSet so that it avoids the problem until it's fixed elsewhere, that would be fine with me, but I don't even understand what's going wrong. I'm asking here to see if someone is familiar with it and what it means.
My searching for the issue online turned up a thread from about a year ago (http://lists.scsys.co.uk/pipermail/dbix-class/2012-June/010553.html). If there's an answer in there, I failed to comprehend it.
Any help would be appreciated. Thank you.