--回收schema的public权限
--revoke all on schema public from public; --正常情况使用这个
revoke all on schema public,tiger,tiger_data,topology from public; --使用postgis扩展使用这个
--从core数据库收回public的所有权限
revoke all on database core from public;
revoke all on database postgres from public;
--重新将schema授予数据库所有者
grant all on schema public,tiger,tiger_data,topology to 数据库所有者;

create schema history;
revoke all on schema history from public;
--重新将schema history授予数据库所有者
grant all on schema history to 数据库所有者;

psql -h localhost -p 5432 -U postgres -d core

--创建一个名称sel的用户
create user sel with nosuperuser nocreatedb nocreaterole noinherit login noreplication nobypassrls password '123';
--允许连接至数据库core
grant connect on database core to sel;

--查看角色使用\duS+
\duS+
--或
\duS+ sel

--查看用户在schema的权限
\dp

--查看数据库的用户
\l+

r -- SELECT ("读")
w -- UPDATE ("写")
a -- INSERT ("追加")
d -- DELETE
D -- TRUNCATE
x -- REFERENCES
t -- TRIGGER
X -- EXECUTE
U -- USAGE
C -- CREATE
c -- CONNECT
T -- TEMPORARY
arwdDxt -- ALL PRIVILEGES （对于表，对其他对象会变化）
* -- 用于前述特权的授权选项

psql -h localhost -p 5432 -U sel -d core

drop table aaa;
create table aaa(
 objectid integer
);
select * from features;

ERROR: table "aaa" does not exist
ERROR: no schema has been selected to create in
ERROR: relation "features" does not exist

psql -h localhost -p 5432 -U postgres -d core

grant usage on schema public to sel;
grant select on all tables in schema public to sel;

psql -h localhost -p 5432 -U sel -d core

select * from features;
delete from features;

psql -h localhost -p 5432 -U postgres -d core

--回收分配的权限并删除用户
revoke select on all tables in schema public from sel;
revoke usage on schema public from sel;
revoke connect on database core from sel;
drop role sel;

psql -U username -d database_name -h host -W

su username
psql

createuser username 

CREATE ROLE rolename;

CREATE USER username;

CREATE ROLE role_name WITH optional_permissions;

CREATE ROLE username WITH LOGIN;

ALTER ROLE username WITH attribute_options;

ALTER ROLE username WITH NOLOGIN;

GRANT permission_type ON table_name TO role_name;

GRANT UPDATE ON demo TO demo_role; --赋予demo_role demo表的update权限
GRANT SELECT ON ALL TABLES IN SCHEMA PUBLIC to demo_role; --赋予demo_role所有表的SELECT权限

GRANT ALL ON demo TO demo_role; --赋给用户所有权限
GRANT SELECT ON demo TO PUBLIC; --将SELECT权限赋给所有用户

REVOKE permission_type ON table_name FROM user_name;

CREATE ROLE temporary_users;
GRANT temporary_users TO demo_role;
GRANT temporary_users TO test_user;

SET ROLE role_name; --切换到role_name用户
RESET ROLE; --切换回最初的role

ALTER ROLE test_user INHERIT;

DROP ROLE role_name;
DROP ROLE IF EXISTS role_name;