在亚马逊ec2 RDS
Postgresql：
=> SHOW rds.extensions; rds.extensions -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- btree_gin,btree_gist,chkpass,citext,cube,dblink,dict_int,dict_xsyn,earthdistance,fuzzystrmatch,hstore,intagg,intarray,isn,ltree,pgcrypto,pgrowlocks,pg_trgm,plperl,plpgsql,pltcl,postgis,postgis_tiger_geocoder,postgis_topology,sslinfo,tablefunc,tsearch2,unaccent,uuid-ossp (1 row)
你可以看到,uuid-ossp扩展名确实存在.但是,当我调用uuid_v4生成函数时,它会失败：
CREATE TABLE my_table (
id uuid DEFAULT uuid_generate_v4() NOT NULL,name character varying(32) NOT NULL,);
这是怎么回事？
扩展名可用,但未安装在此数据库中.
CREATE EXTENSION "uuid-ossp";