use strict;
use warnings;
-use base qw/DBIx::Class::Storage::DBI/;
+use base qw/DBIx::Class::Storage::DBI::MultiColumnIn/;
-# __PACKAGE__->load_components(qw/PK::Auto/);
+__PACKAGE__->sql_maker_class('DBIx::Class::SQLAHacks::MySQL');
sub with_deferred_fk_checks {
my ($self, $sub) = @_;
return shift->dbh->selectrow_hashref('show slave status')->{Seconds_Behind_Master};
}
+# MySql can not do subquery update/deletes, only way is slow per-row operations.
+# This assumes you have set proper transaction isolation and use innodb.
+sub _subq_update_delete {
+ return shift->_per_row_update_delete (@_);
+}
+
+# MySql chokes on things like:
+# COUNT(*) FROM (SELECT tab1.col, tab2.col FROM tab1 JOIN tab2 ... )
+# claiming that col is a duplicate column (it loses the table specifiers by
+# the time it gets to the *). Thus for any subquery count we select only the
+# primary keys of the main table in the inner query. This hopefully still
+# hits the indexes and keeps mysql happy.
+# (mysql does not care if the SELECT and the GROUP BY match)
+sub _grouped_count_select {
+ my ($self, $source, $rs_args) = @_;
+ my @pcols = map { join '.', $rs_args->{alias}, $_ } ($source->primary_columns);
+ return @pcols ? \@pcols : $rs_args->{group_by};
+}
+
1;
=head1 NAME