Added a default _delete() method to CI_DB_active_record
diff --git a/system/database/drivers/oci8/oci8_driver.php b/system/database/drivers/oci8/oci8_driver.php
index a452d51..1b66178 100644
--- a/system/database/drivers/oci8/oci8_driver.php
+++ b/system/database/drivers/oci8/oci8_driver.php
@@ -644,7 +644,7 @@
 		empty($like) OR $conditions[] = implode(' ', $like);
 		empty($limit) OR $conditions[] = 'rownum <= '.$limit;
 
-		return 'DELETE FROM '.$table.(empty($conditions) ? '' : ' WHERE '.implode(' AND ', $conditions));
+		return 'DELETE FROM '.$table.(count($conditions) > 0 ? ' WHERE '.implode(' AND ', $conditions) : '');
 	}
 
 	// --------------------------------------------------------------------