postgresql实现replace into功能

PostgreSQL 9.5-

使用函数或with实现

create table test(id int primary key, info text, crt_time timestamp);
with upsert as (update test set info='test',crt_time=now() where id=1 returning *) insert into test select 1,'test',now() where not exists (select 1 from upsert where id=1);  

PostgreSQL 9.5+

PostgreSQL 9.5 引入了一项新功能，UPSERT(insert on conflict do)，当插入遇到约束错误时，直接返回，或者改为执行UPDATE。

INSERT INTO table_name VALUES() ON conflict (唯一索引字段) DO
UPDATE ...