EDIT : there is no need for an extension anymore. You can now generate a uuid
with the function gen_random_uuid()
that is available by default since PostgreSQL 14.
I am developing an application in which I decided to use UUIDs for the primary and foreign keys. For this purpose, I used the extension "uuid-ossp" which works fine in dev environment.
Now, I am installing the testing environment. The database setup is imposed by a script made by the customer. The structure is standard: admin user, application user, application namespace etc.
I can create the extension with the admin account:
$ psql mydb -U [admin_user]
mydb=# CREATE EXTENSION IF NOT EXISTS "uuid-ossp";
CREATE EXTENSION
mydb=# select uuid_generate_v4();
uuid_generate_v4
--------------------------------------
23e45b57-a658-41a5-8661-0cc06568eff8
But when I connect with the database application user, I cannot generate a uuid :
$ psql mydb -U [app_user]
SELECT uuid_generate_v4();
mydb=> select uuid_generate_v4();
ERROR: function uuid_generate_v4() does not exist
Both admin_user and app_user are on the same database. The app_user can "see" the extension but not use it:
bdd3001=> select * from pg_catalog.pg_extension;
extname | [...]
-----------+-
plpgsql | [...]
uuid-ossp | [...]
Any ideas?
You need the schema you installed the extension to in your search_path
.
By default an extension is installed to the "current" schema at the time of installation - the first schema in the search_path
setting during the session that installed it.
So where did you end up installing it? See pg_extension.extnamespace
:
SELECT e.extname
, n.nspname AS home_schema_of_extension
, extrelocatable AS extension_can_be_relocated
FROM pg_catalog.pg_extension e
JOIN pg_catalog.pg_namespace n ON n.oid = e.extnamespace;
extname | home_schema_of_extension | extension_can_be_relocated
----------+--------------------------+---------------------------
plpgsql | pg_catalog | f
intarray | public | t
tablefunc | public | t
pg_trgm | public | t
...
You can relocate an extension with ALTER EXTENSION
:
ALTER EXTENSION "uuid-ossp" SET SCHEMA public;
Double quotes required for the name with dash (an unfortunate choice of name in Postgres).
Related with more explanation: