1.创建用户：

create user pgdbAdmin with password "Pgdb_15432";

2.创建数据库：

create database pgdb owner pgdbAdmin;

3.创建SCHEMA；

create schema pgdbAdmin;

4.赋予数据库管理员用户权限：

grant all privileges on database pgdb to pgdbAdmin;
grant usage on schema public,pgdbAdmin to pgdbAdmin;
grant all privileges on all tables in schema public,pgdbAdmin to pgdbAdmin;
grant all privileges on all sequences in schema public,pgdbAdmin to pgdbAdmin;
grant select,insert,update,delete on all tables in schema public,pgdbAdmin to pgdbAdmin;
grant all on schema public,pgdbAdmin to pgdbAdmin;

5.赋予数据库其他用户权限(只读)：

create user pgdbRead with password "Pgdb_15432" 
alter user pgdbRead set default_transaction_read_only = on;
grant CONNECT ON DATABASE pgdb to pgdbRead;
grant USAGE ON SCHEMA public,pgdbAdmin TO pgdbRead;

6.赋予schema下所有表的只读权限

grant SELECT ON all tables in schema public,pgdbAdmin to pgdbRead;

7.修改用户属性，继承该schema下的只读权限

alter default privileges in schema public,pgdbAdmin grant select on tables to pgdbRead;

8.修改默认的SEARCH_PATH：

alter role pgdbRead set search_path = "$user",pgdbAdmin,public;