L</sequence> value as well.
Also set this for MSSQL columns with the 'uniqueidentifier'
-L<DBIx::Class::ResultSource/data_type> whose values you want to automatically
-generate using C<NEWID()>, unless they are a primary key in which case this will
-be done anyway.
+L<data_type|DBIx::Class::ResultSource/data_type> whose values you want to
+automatically generate using C<NEWID()>, unless they are a primary key in which
+case this will be done anyway.
=item extra
Additionally, defines a L<unique constraint|add_unique_constraint>
named C<primary>.
-The primary key columns are used by L<DBIx::Class::PK::Auto> to
-retrieve automatically created values from the database. They are also
-used as default joining columns when specifying relationships, see
-L<DBIx::Class::Relationship>.
+Note: you normally do want to define a primary key on your sources
+B<even if the underlying database table does not have a primary key>.
+See
+L<DBIx::Class::Intro/The Significance and Importance of Primary Keys>
+for more info.
=cut
return @{shift->_primaries||[]};
}
+sub _pri_cols {
+ my $self = shift;
+ my @pcols = $self->primary_columns
+ or $self->throw_exception (sprintf(
+ 'Operation requires a primary key to be declared on %s via set_primary_key',
+ ref $self,
+ ));
+ return @pcols;
+}
+
=head2 add_unique_constraint
=over 4