postgresql函數示例

CREATE OR REPLACE FUNCTION "public"."f_customer_rel_manager"()
  RETURNS "pg_catalog"."void" AS $BODY$
DECLARE  uid int8; c_record record; resu VARCHAR; res int;u_manager_id VARCHAR;
BEGIN
    DROP SEQUENCE IF EXISTS f_customer_manager_seq;
    CREATE SEQUENCE f_customer_manager_seq
        INCREMENT 1
        MINVALUE 1
        MAXVALUE 9223372036854775807
        START 1
        CACHE 1
        CYCLE;
		DELETE FROM bas_cm_customer_rel_manager;
		-- 查詢要操作的數據
		FOR c_record in (SELECT id, pid from bas_cm_customer_rel_r) loop
			SELECT manager_id ::varchar FROM bas_cm_customer where id = c_record.pid into resu;
				IF resu != '' THEN
					IF (position(',' in resu ) > 0) THEN
						FOR u_manager_id in(SELECT UNNEST(string_to_array(resu,','))) loop
							SELECT count(*) FROM bas_cm_customer_rel_manager where customer_id = c_record.id and manager_id = u_manager_id::int8 into res;
							IF(res = 0) THEN
								select nextval('f_customer_manager_seq') into uid;
								insert into bas_cm_customer_rel_manager 
										(id,status,creator_id,customer_id,create_time,manager_id)
								values
								(uid,'1',999,c_record.id,now(),u_manager_id::int8);
							END IF;
						END loop;
					ELSE
							SELECT count(*) FROM bas_cm_customer_rel_manager where customer_id = c_record.id AND manager_id = resu::int8 into res;
							IF(res = 0) THEN
								select nextval('f_customer_manager_seq') into uid;
								insert into bas_cm_customer_rel_manager 
										(id,status,creator_id,customer_id,create_time,manager_id)
								values
								(uid,'1',999,c_record.id,now(), resu::int8);
							END IF;
					END IF;
					ELSE
					select nextval('f_customer_manager_seq') into uid;
					insert into bas_cm_customer_rel_manager 
							(id,status,creator_id,customer_id,create_time,manager_id)
					values
					(uid,'1',999,c_record.id,now(), null);
				END IF;
		END loop;
DROP SEQUENCE if EXISTS f_customer_manager_seq;
RETURN;
END;
$BODY$
  LANGUAGE 'plpgsql' VOLATILE COST 100;