package Jifty::DBI::Handle::Sybase;
use Jifty::DBI::Handle;
@ISA = qw(Jifty::DBI::Handle);

use vars qw($VERSION @ISA $DBIHandle $DEBUG);
use strict;

=head1 NAME

  Jifty::DBI::Handle::Sybase -- a Sybase specific Handle object

=head1 SYNOPSIS

=head1 DESCRIPTION

This module provides a subclass of L<Jifty::DBI::Handle> that
compensates for some of the idiosyncrasies of Sybase.

=head1 METHODS

=head2 insert

Takes a table name as the first argument and assumes that the rest of
the arguments are an array of key-value pairs to be inserted.

If the insert succeeds, returns the id of the insert, otherwise,
returns a L<Class::ReturnValue> object with the error reported.

=cut

sub insert {
    my $self = shift;

    my $table = shift;
    my %pairs = @_;
    my $sth   = $self->SUPER::insert( $table, %pairs );
    if ( !$sth ) {
        return ($sth);
    }

    # Can't select identity column if we're inserting the id by hand.
    unless ( $pairs{'id'} ) {
        my @row = $self->fetch_result('SELECT @@identity');

        # TODO: Propagate Class::ReturnValue up here.
        unless ( $row[0] ) {
            return (undef);
        }
        $self->{'id'} = $row[0];
    }
    return ( $self->{'id'} );
}

=head2 database_version

return the database version, trimming off any -foo identifier

=cut

sub database_version {
    my $self = shift;
    my $v    = $self->SUPER::database_version();

    $v =~ s/\-(.*)$//;
    return ($v);

}

=head2 case_sensitive 

Returns undef, since Sybase's searches are not case sensitive by default 

=cut

sub case_sensitive {
    my $self = shift;
    return (1);
}

# sub apply_limits {
#     my $self         = shift;
#     my $statementref = shift;
#     my $per_page     = shift;
#     my $first        = shift;
#
# }

=head2 distinct_query STATEMENTREF

Takes an incomplete SQL SELECT statement and massages it to return a
DISTINCT result set.

=cut

sub distinct_query {
    my $self         = shift;
    my $statementref = shift;
    my $collection   = shift;
    my $table        = $collection->table;

    if ( $collection->_order_clause =~ /(?<!main)\./ ) {

        # Don't know how to do ORDER BY when the DISTINCT is in a subquery
        warn
            "Query will contain duplicate rows; don't how how to ORDER BY across DISTINCT";
        $$statementref = "SELECT main.* FROM $$statementref";
    } else {

        # Wrapper select query in a subselect as Sybase doesn't allow
        # DISTINCT against CLOB/BLOB column types.
        $$statementref
            = "SELECT main.* FROM ( SELECT DISTINCT main.id FROM $$statementref ) distinctquery, $table main WHERE (main.id = distinctquery.id) ";
    }
    $$statementref .= $collection->_group_clause;
    $$statementref .= $collection->_order_clause;
}

1;

__END__

=head1 AUTHOR

Jesse Vincent, jesse@fsck.com

=head1 SEE ALSO

L<Jifty::DBI>, L<Jifty::DBI::Handle>, L<DBD::Sybase>

=cut