improve with_deferred_fk_checks for Oracle, add tests

[dbsrgits/DBIx-Class.git] / lib / DBIx / Class / Storage / DBI / Oracle / Generic.pm

diff --git a/lib/DBIx/Class/Storage/DBI/Oracle/Generic.pm b/lib/DBIx/Class/Storage/DBI/Oracle/Generic.pm
index 512fff8..448c203 100644 (file)
--- a/lib/DBIx/Class/Storage/DBI/Oracle/Generic.pm
+++ b/lib/DBIx/Class/Storage/DBI/Oracle/Generic.pm
@@ -2,6 +2,8 @@ package DBIx::Class::Storage::DBI::Oracle::Generic;
 
 use strict;
 use warnings;
+use Scope::Guard ();
+use Context::Preserve ();
 
 =head1 NAME
 
@@ -255,7 +257,7 @@ sub source_bind_attributes
       if ($DBD::Oracle::VERSION eq '1.23') {
         $self->throw_exception(
 "BLOB/CLOB support in DBD::Oracle == 1.23 is broken, use an earlier or later ".
-"version"
+"version.\n\nSee: https://rt.cpan.org/Public/Bug/Display.html?id=46016\n"
         );
       }
 
@@ -326,6 +328,35 @@ sub relname_to_table_alias {
   return $new_alias;
 }
 
+=head2 with_deferred_fk_checks
+
+Runs a coderef between:
+
+  alter session set constraints = deferred
+  ...
+  alter session set constraints = immediate
+
+to defer foreign key checks.
+
+Constraints must be declared C<DEFERRABLE> for this to work.
+
+=cut
+
+sub with_deferred_fk_checks {
+  my ($self, $sub) = @_;
+
+  my $txn_scope_guard = $self->txn_scope_guard;
+
+  $self->_do_query('alter session set constraints = deferred');
+  
+  my $sg = Scope::Guard->new(sub {
+    $self->_do_query('alter session set constraints = immediate');
+  });
+
+  return Context::Preserve::preserve_context(sub { $sub->() },
+    after => sub { $txn_scope_guard->commit });
+}
+
 =head1 AUTHOR
 
 See L<DBIx::Class/CONTRIBUTORS>.