SQLite test database file

[greenFox]

I have a couple of little apps written with Perl/Tk and SQLite. Since I didn't want my apps opening each others databases I added a table (called global) with a column "application" and then I test for that having the correct value. Which worked well enough except if the table "global" didn't exist or the file selected for opening wasn't an SQLite database in which case I got error messages- not unexpected but I wanted my app to handle the situation more gracefully. I hacked around with it and came up with the below which behaves but seems a bit kludgy... is there a better way?

sub check_database_app {
  my $check_for = $_[0] || die "app name not passed!\n";
  local $SIG{'__WARN__'} = sub { my $err = "eat the error $_[0]"; };
  my $sth = $DBH->prepare("SELECT application FROM global")
                 or die "Couldn't prepare statement: " . $DBH->errstr;
  $sth->execute() or do {
    $sth->errstr() =~ /no such table/i and return 0;
    die "Unknown error: " . $sth->errstr();
    return 0;
  };

  my $app = ($sth->fetchrow_array())[0];
  $app eq $check_for ? return 1 : return 0;
}

}