postgresql 赋权语句 grant的正确使用说明
数据库 发布日期：2024/12/25 浏览次数：1
grant select on all tables in schema public to username;
此句是有效的复制语句
PG中有schema的概念，
以下的语句就是不行
网上得来终觉浅，错误比较多，还是要自己试试才行。
补充：postgresql关于访问视图需要的权限
某个用户访问一个视图，这个用户需要具备这个视图的schema的usage和这个视图本身的select权限，如果视图的基表来自其他schema，可能还需要其他schema的usage权限(根据postgresql改造的redshift发现了此问题)，但是这个用户不需要视图对应基表的select权限
如果基表被修改了或重建了，需要把基表重新赋权给视图的owner，否则视图无法生效，但是不需要把基表授权给需要访问视图的用户，比如视图view1的owner是viewowner，一个用户user1有访问view1的权限，一旦view1的基本table1被重建了，需要把基表table1的权限重新赋给viewowner，但是不需要把table1的权限重新赋给uers1
案例1：
用户u2访问s2.view1,用户u2只需要s2的usage权限和s2.view1的select权限，而不需要s2.view1基表s1.table1的select权限和对应schema s1的usage权限
t1=# \c You are now connected to database “t1” as user “postgres” t1=# \dns List of schemas Name | Owner --------±--------- public | postgres s1 | postgres s2 | postgres (3 rows) t1=# create user u1 password ‘123456'; CREATE ROLE t1=# create user u2 password ‘123456'; CREATE ROLE t1=# grant all privileges on schema s1 to u1; GRANT t1=# grant all privileges on schema s2 to u1; GRANT t1=# \c - u1 You are now connected to database “t1” as user “u1”. t1=> create table s1.table1(hid int); CREATE TABLE t1=> create view s2.view1 as select * from s1.table1; CREATE VIEW t1=> \c - u2 You are now connected to database “t1” as user “u2”. t1=> select * from s2.view1; ERROR: permission denied for schema s2 LINE 1: select * from s2.view1; t1=> \c - postgres You are now connected to database “t1” as user “postgres”. t1=# grant usage on schema s2 to u2; GRANT t1=# \c - u2 You are now connected to database “t1” as user “u2”. t1=> select * from s2.view1; ERROR: permission denied for view view1 t1=> \c - postgres You are now connected to database “t1” as user “postgres”. t1=# grant select on s2.view1 to u2; t1=# \c - u2 You are now connected to database “t1” as user “u2”. t1=> select * from s2.view1; hid (0 rows)
案例2：
redshift数据库，用户lukes访问cl_crm.v_account,用户lukes不仅需要cl_crm的usage权限和cl_crm.v_account的select权限，还需要cl_crm.v_account基表对应schema的usage权限，但是不需要基表raw_wam.ibdwsurvey、raw_c3.ibdwsurveyinfo的select权限
创建用户lukes,并授权用户拥有视图cl_crm.v_account对应schema的usage权限
create user lukes password ‘X123_x123' grant usage on schema cl_crm to lukes
lukes用户查询cl_crm.v_account视图报错
select * from cl_crm.v_account limit 1 Amazon Invalid operation: permission denied for schema raw_wam; 1 statement failed.
对用户lukes授权usage在视图基表对应的schema上
grant usage on schema raw_wam to lukes grant usage on schema raw_c3 to lukes
lukes用户查询cl_crm.v_account视图继续报错
Amazon Invalid operation: permission denied for relation v_account;
对用户lukes授权访问视图的select权限
grant select on table cl_crm.v_account to lukes
lukes用户查询cl_crm.v_account正常了
cl_crm.v_account视图语句是
CREATE or replace view cl_crm.v_account as with userids as ( select distinct su.ibsu_userid from raw_wam.ibdwsurvey su left join raw_c3.ibdwsurveyinfo si …)
以上为个人经验，希望能给大家一个参考，也希望大家多多支持。如有错误或未考虑完全的地方，望不吝赐教。