首先，你要知道PostgreSQL默認schema下新建的表，對於一個普通用戶不會有select的權限的，所以我需要修改PostgreSQl默認的權限，把select提前賦予普通用戶，需要使用到alter default privileges這個命令

Session1 (user:postgres):

#psql

create role role1 password '123456' login;

create schema schema1;

grant usage on schema schema1 to role1;

testdb=# \dn+ schema1;

List of schemas

Name | Owner | Access privileges | Description

---------+----------+----------------------+-------------

schema1 | postgres | postgres=UC/postgres+|

| | role1=U/postgres |

alter default privileges in schema schema1 grant select on tables to role1;

testdb=# \ddp+

Default access privileges

Owner | Schema | Type | Access privileges

----------+---------+-------+-------------------

postgres | schema1 | table | role1=r/postgres

create table schema1.t1(c1 int,c2 varchar(10));

insert into schema1.t1 values(1,'aaa');

testdb=# \dp+

Access privileges

Schema | Name | Type | Access privileges | Column privileges | Policies

---------+------+-------+---------------------------+-------------------+----------

schema1 | t1 | table | postgres=arwdDxt/postgres+| |

| | | role1=r/postgres | |

Session2 read_only:

#psql -h 172.16.101.54 -p 5432 testdb role1

testdb=> select * from schema1.t1;

c1 | c2

----+-----

1 | aaa

(1 row)

Case: 一個read-only 角色對某個schema下的新建的表,無需單獨授權，直接擁有只讀權