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        or die "Couldn't determine version number from version string '$version_string'";

    return $version;
}

sub identifier_length
{
    my $self = shift;

    return $self->{identifier_length} if $self->{identifier_length};

    return
        $self->{identifier_length} = $self->rdbms_version ge '7.3' ? 63 : 31;
}

1;

__END__

=head1 NAME

Alzabo::Driver::PostgreSQL - PostgreSQL specific Alzabo driver subclass

=head1 SYNOPSIS

  use Alzabo::Driver::PostgreSQL;

=head1 DESCRIPTION

This provides some PostgreSQL specific implementations for the virtual
methods in Alzabo::Driver.

=head1 METHODS

=head2 connect, create_database, drop_database

Besides the parameters listed in L<the Alzabo::Driver
docs|Alzabo::Driver/Parameters for connect(),
create_database(), and drop_database()>, the following parameters
are accepted:

=over 4

=item * options

=item * tty

=back

=head2 schemas

This method accepts the same parameters as the C<connect()> method.

=head2 get_last_id

Returns the last id created for a sequenced column.

=head2 identifier_length

Returns the maximum identifier length allowed by the database.  This
is really a guess based on the server version, since the actual value
is set when the server is compiled.

=head1 BUGS

In testing, I found that there were some problems using Postgres in a
situation where you start the app, connect to the database, get some
data, fork, reconnect, and and then get more data.  I suspect that
this has more to do with the DBD::Pg driver and/or Postgres itself
than Alzabo.  I don't believe this would be a problem with an app
which forks before ever connecting to the database (such as mod_perl).

=head1 AUTHOR

Dave Rolsky, <autarch@urth.org>

=cut