Update to ng6_database.sql

New check_demand_insert trigger to prevent the insertion of a second
purge demand for a given project.

Issue #192

bin/ng6_database.sql

@@ -1233,6 +1233,34 @@ CREATE ALGORITHM=UNDEFINED DEFINER=`ng6`@`localhost` SQL SECURITY DEFINER VIEW `
 
 CREATE ALGORITHM=UNDEFINED DEFINER=`ng6`@`localhost` SQL SECURITY DEFINER VIEW `tx_nG6_view_project_user` AS select `tx_nG6_project`.`uid` AS `project_id`,`tx_nG6_project`.`space_id` AS `space_id`,`fe_users`.`uid` AS `user_id`, `fe_users`.`username` AS `user_name`,`fe_users`.`email` AS `email`,`fe_users`.`usergroup` AS `user_group`,`fe_rights_levels`.`right_level_label` AS `right_level_label`,`fe_groups`.`title` AS `user_group_title` from ((((`tx_nG6_project` join `fe_rights` on((`fe_rights`.`project_id` = `tx_nG6_project`.`uid`))) join `fe_users` on((`fe_rights`.`fe_user_id` = `fe_users`.`uid`))) join `fe_groups` on((`fe_users`.`usergroup` = `fe_groups`.`uid`))) join `fe_rights_levels` on((`fe_rights_levels`.`right_level_id` = `fe_rights`.`right_id`)));
 
+--
+-- Trigger check_demand_insert to prevent the insertion of a second purge demand for a single project
+--
+
+DELIMITER ;;
+
+CREATE TRIGGER check_demand_insert BEFORE INSERT ON `tx_nG6_purge_demand`
+FOR EACH ROW
+BEGIN
+
+DECLARE var_demand_state, var_project_id, var_count int;
+
+SELECT demand_state, project_id, count(*) as count
+INTO var_demand_state, var_project_id, var_count
+FROM tx_nG6_purge_demand
+WHERE demand_state = 'sent' AND project_id = new.project_id 
+GROUP BY demand_state, project_id;
+
+IF var_count > 0 THEN
+set @message_text = concat('A purge demand already exists for project ', new.project_id);
+signal sqlstate '45000' 
+set message_text = @message_text;
+END IF;
+
+END;
+;; 
+
+
 
 /*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
 /*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;