這篇文章主要介紹了sql腳本函數(shù)編寫(xiě)postgresql數(shù)據(jù)庫(kù)實(shí)現(xiàn)解析,文中通過(guò)示例代碼介紹的非常詳細(xì)，對(duì)大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價(jià)值,需要的朋友可以參考下
postgresql創(chuàng)建Long自增函數(shù)
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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;--> |
創(chuàng)建sql腳本postgresql
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do language plpgsql$$beginupdate grade set grade = 90 where sno = '20161003';end$$ |
以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持服務(wù)器之家。
原文鏈接：https://www.cnblogs.com/ltspring/p/11508636.html
