问Postgresql在函数内部执行动态查询返回NULLEN我有一个Postgresql函数，它将获得一些输入(通过动态查询从这...
(crontab -l2>/dev/null;echo"0 14 * * * bash /tmp/create_part.sh ")|crontab- 使用数据库内置调度器,如 pg_cron、pg_timetable 以pg_cron 为例,每天下午14点创建次日的分区表: CREATE OR REPLACE FUNCTION create_tab_part()RETURNS integer LANGUAGEplpgsql AS $$ DECLARE dateStr varchar; BEGIN S...
RAISE EXCEPTION'Date out of range. Fix the log_history_insert_trigger() function!'; END IF; RETURN NULL; END; $function$#然后输入“wq”保存退出#然后执行\g使触发器函数变更生效postgres-# \gCREATE FUNCTION 查看触发器函数定义,可以看到2023年分区已添加 postgres=# \df+ log_history_insert_trigger...
如果采用这种形式,你的function代码看起来会像这样:CREATE OR REPLACE FUNCTION function1 () RETURNS setof table1 AS $body$ DECLARE result record; BEGIN for result in select * from table1 loop return next result; end loop; return; END; $body$ LANGUAGE 'plpgsql' VOLATILE CALLED ON NULL INPUT S...
Datum //返回类型,PostgreSQL自定义类型 gram_checker(PG_FUNCTION_ARGS) //PG_FUNCTION_ARGS,PostgreSQL自定义宏 { char *str = PG_GETARG_CSTRING(0); //获取cstring格式的参数 raw_parser(str); //解析SQL PG_RETURN_NULL(); //返回空值 } src/include/catalog/pg_proc.dat: //函数oid,6424 //descr...
RAISE EXCEPTION 'Date out of range. Fix the measurement_insert_trigger() function!'; END IF; RETURN NULL; END; $$ LANGUAGE plpgsql; 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 创建函数后,我们创建一个调用触发器函数的触发器: ...
RETURN NULL; END; $$ LANGUAGE plpgsql; 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 对父表创建触发器 CREATE TRIGGER insert_tbl_partition_trigger BEFORE INSERT ON tbl_partition FOR EACH ROW EXECUTE PROCEDURE tbl_partition_trigger(); ...
CREATE OR REPLACE FUNCTION function_name (parameters-list) RETURNS return_type LANGUAGE plpgsql AS $$ DECLARE --- variables BEGIN --- SQL statements (logic) END $$ 优势 你可以在一个函数中拥有多个SQL语句,你可以返回任何类型的结果,如一个表或一个单一的值(整数,varchar,日期,时间戳,等等)。 限...
pipeline=#createor replacefunctiontg1()returnstriggeras$$declarebeginifnew.flag=2theninsertintos0values(new.*);deletefrompret1whereid=new.id;returnnull;endif;returnnew;end; $$languageplpgsqlstrict;CREATEFUNCTIONpipeline=#createtriggertg1beforeupdateonpret1foreachrowexecuteproceduretg1();CREATETRIGGER ...
AS $function$ declare res varbit; begin select (string_agg(mod((2*random())::int,2)::text,''))::varbit into res from generate_series(1,$1); if res is not null then return res; else return ''::varbit; end if; end;