postgresql - 扩展存在但 uuid_generate_v4 失败

Question

在亚马逊 ec2 RDS Postgresql 上:

=> 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)

如您所见，uuid-ossp 扩展确实存在。但是，当我调用生成 uuid_v4 的函数时，它失败了:

CREATE TABLE my_table (
    id uuid DEFAULT uuid_generate_v4() NOT NULL,
    name character varying(32) NOT NULL,

);

这是怎么回事？

Answer 1

该扩展可用但未安装在此数据库中。

CREATE EXTENSION IF NOT EXISTS "uuid-ossp";