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IVAN / DBIx-DBSchema-0.21 / DBSchema / DBD.pm 

            

              
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package DBIx::DBSchema::DBD;
use strict;
use vars qw($VERSION);
$VERSION = '0.02';
=head1 NAME
DBIx::DBSchema::DBD - DBIx::DBSchema Driver Writer's Guide and Base Class
=head1 SYNOPSIS
  perldoc DBIx::DBSchema::DBD
  package DBIx::DBSchema::DBD::FooBase
  use DBIx::DBSchmea::DBD;
  @ISA = qw(DBIx::DBSchema::DBD);
=head1 DESCRIPTION
Drivers should be named DBIx::DBSchema::DBD::DatabaseName, where DatabaseName
is the same as the DBD:: driver for this database.  Drivers should implement the
following class methods:
=over 4
=item columns CLASS DBI_DBH TABLE
Given an active DBI database handle, return a listref of listrefs (see
L<perllol>), each containing six elements: column name, column type,
nullability, column length, column default, and a field reserved for
driver-specific use.
=item column CLASS DBI_DBH TABLE COLUMN
Same as B<columns> above, except return the listref for a single column.  You
can inherit from DBIx::DBSchema::DBD to provide this function.
=cut
sub column {
  my($proto, $dbh, $table, $column) = @_;
  #@a = grep { $_->[0] eq $column } @{ $proto->columns( $dbh, $table ) };
  #$a[0];
  @{ [
    grep { $_->[0] eq $column } @{ $proto->columns( $dbh, $table ) }
  ] }[0]; #force list context on grep, return scalar of first element
}
=item primary_key CLASS DBI_DBH TABLE
Given an active DBI database handle, return the primary key for the specified
table.
=item unique CLASS DBI_DBH TABLE
Given an active DBI database handle, return a hashref of unique indices.  The
keys of the hashref are index names, and the values are arrayrefs which point
a list of column names for each.  See L<perldsc/"HASHES OF LISTS"> and
L<DBIx::DBSchema::ColGroup>.
=item index CLASS DBI_DBH TABLE
Given an active DBI database handle, return a hashref of (non-unique) indices.
The keys of the hashref are index names, and the values are arrayrefs which
point a list of column names for each.  See L<perldsc/"HASHES OF LISTS"> and
L<DBIx::DBSchema::ColGroup>.
=back
=head1 TYPE MAPPING
You can define a %typemap array for your driver to map "standard" data    
types to database-specific types.  For example, the MySQL TIMESTAMP field
has non-standard auto-updating semantics; the MySQL DATETIME type is 
what other databases and the ODBC standard call TIMESTAMP, so one of the   
entries in the MySQL %typemap is:
  'TIMESTAMP' => 'DATETIME',
Another example is the Pg %typemap which maps the standard types BLOB and
LONG VARBINARY to the Pg-specific BYTEA:
  'BLOB' => 'BYTEA',
  'LONG VARBINARY' => 'BYTEA',
Make sure you use all uppercase-keys.
=head1 AUTHOR
Ivan Kohler <ivan-dbix-dbschema@420.am>
=head1 COPYRIGHT
Copyright (c) 2000 Ivan Kohler
Copyright (c) 2000 Mail Abuse Prevention System LLC
All rights reserved.
This program is free software; you can redistribute it and/or modify it under
the same terms as Perl itself.
=head1 BUGS
=head1 SEE ALSO
L<DBIx::DBSchema>, L<DBIx::DBSchema::DBD::mysql>, L<DBIx::DBSchema::DBD::Pg>,
L<DBIx::DBSchema::ColGroup>, L<DBI>, L<DBI::DBD>, L<perllol>,
L<perldsc/"HASHES OF LISTS">
=cut 
1;