sql指令碼函式編寫postgresql資料庫實現解析
阿新 • • 發佈:2020-01-09
這篇文章主要介紹了sql指令碼函式編寫postgresql資料庫實現解析,文中通過示例程式碼介紹的非常詳細,對大家的學習或者工作具有一定的參考學習價值,需要的朋友可以參考下
postgresql建立Long自增函式
CREATE SEQUENCE global_id_sequence; CREATE OR REPLACE FUNCTION seq_id(OUT result bigint) AS $$ DECLARE our_epoch bigint := 1314220021721; seq_id bigint; now_millis bigint; -- the id of this DB shard,must be set for each -- schema shard you have - you could pass this as a parameter too shard_id int := 1; BEGIN SELECT nextval('global_id_sequence') % 1024 INTO seq_id; SELECT FLOOR(EXTRACT(EPOCH FROM clock_timestamp()) * 1000) INTO now_millis; result := (now_millis - our_epoch) << 23; result := result | (shard_id << 10); result := result | (seq_id); END; $$ LANGUAGE PLPGSQL; <!--alter function seq_id(out bigint) owner to postgres;-->
建立sql指令碼postgresql
do language plpgsql $$ begin update grade set grade = 90 where sno = '20161003'; end $$
以上就是本文的全部內容,希望對大家的學習有所幫助,也希望大家多多支援我們。