Postgresql添加/删除触发器示例
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-- 定义触发器 CREATE TRIGGER "vss_after_insert_flow_201702" AFTER INSERT ON "public"."vss_passenger_flow_201702" FOR EACH ROW EXECUTE PROCEDURE "vss_after_insert_flow"();
--删除触发器 DROP TRIGGER vss_after_insert_flow_201702 ON vss_passenger_flow_201702 ;
--定义存储过程 -- FUNCTION: public.vss_after_insert_flow() -- DROP FUNCTION public.vss_after_insert_flow(); CREATE FUNCTION public.vss_after_insert_flow() RETURNS trigger LANGUAGE ‘plpgsql‘ COST 100.0 VOLATILE NOT LEAKPROOF AS $BODY$ BEGIN --Routine body goes here... IF EXISTS(SELECT camera_id FROM vss_passenger_hour WHERE camera_id = NEW.i_camera_id and datetime = NEW.start_dt::DATE and EXTRACT(hour FROM time) = EXTRACT(hour FROM NEW.start_dt::TIME)) THEN UPDATE vss_passenger_hour SET passenger_in_count = passenger_in_count + NEW.i_enter_num , passenger_out_count = passenger_out_count + NEW.i_leave_num WHERE camera_id = NEW.i_camera_id and datetime = NEW.start_dt::DATE and EXTRACT(hour FROM time) = EXTRACT(hour FROM NEW.start_dt::TIME); ELSE INSERT INTO vss_passenger_hour(region_id,camera_id,datetime,time,passenger_in_count,passenger_out_count) VALUES (NEW.i_area_id,NEW.i_camera_id,NEW.start_dt,to_timestamp(to_char(NEW.start_dt, ‘yyyy-mm-dd HH24‘)||‘:00:00‘, ‘yyyy-mm-dd HH24:MI:SS‘),NEW.i_enter_num,NEW.i_leave_num); END IF; RETURN NULL; END $BODY$; ALTER FUNCTION public.vss_after_insert_flow() OWNER TO postgres;
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