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package FS::h_Common;
use strict;
use FS::Record qw(dbdef);
=head1 NAME
FS::h_Common - History table "mixin" common base class
=head1 SYNOPSIS
package FS::h_tablename;
@ISA = qw( FS::h_Common FS::tablename );
sub table { 'h_table_name'; }
sub insert { return "can't insert history records manually"; }
sub delete { return "can't delete history records"; }
sub replace { return "can't modify history records"; }
=head1 DESCRIPTION
FS::h_Common is intended as a "mixin" base class for history table classes to
inherit from.
=head1 METHODS
=over 4
=item sql_h_search END_TIMESTAMP [ START_TIMESTAMP ]
Returns an a list consisting of the "SELECT" and "EXTRA_SQL" SQL fragments to
search for the appropriate history records created before END_TIMESTAMP
and (optionally) not cancelled before START_TIMESTAMP.
=cut
sub sql_h_search {
my( $self, $end ) = ( shift, shift );
my $table = $self->table;
my $pkey = dbdef->table($table)->primary_key
or die "can't (yet) search history table $table without a primary key";
my $notcancelled = '';
if ( scalar(@_) && $_[0] ) {
$notcancelled = "AND 0 = ( SELECT COUNT(*) FROM $table as notdel
WHERE notdel.$pkey = maintable.$pkey
AND notdel.history_action = 'delete'
AND notdel.history_date > maintable.history_date
AND notdel.history_date <= $_[0]
)";
}
(
"DISTINCT ON ( $pkey ) *",
"AND history_date <= $end
AND ( history_action = 'insert'
OR history_action = 'replace_new'
)
$notcancelled
ORDER BY $pkey ASC, history_date DESC",
'',
'maintable',
);
}
=back
=head1 BUGS
=head1 SEE ALSO
L<FS::Record>, schema.html from the base documentation
=cut
1;
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