PostgreSQL運維—REASSIGN OWNED
REASSIGN OWNED — change the ownership of database objects owned by a database role
語法
REASSIGN OWNED BY { old_role | CURRENT_USER | SESSION_USER } [, ...]
TO { new_role | CURRENT_USER | SESSION_USER }
描述
REASSIGN OWNED instructs the system to change the ownership of database objects owned by any of the old_roles to new_role.
postgres=# create user u1;
CREATE ROLE
postgres=# create user u2;
CREATE ROLE
postgres=# create table t1 (id int);
CREATE TABLE
postgres=# \c - u1
You are now connected to database "postgres" as user "u1".
postgres=> select * from t1;
ERROR: permission denied for table t1
postgres=# \c - u2
You are now connected to database "postgres" as user "u2".
postgres=> select * from t1;
ERROR: permission denied for table t1
postgres=> \c - postgres
You are now connected to database "postgres" as user "postgres".
postgres=# grant select on t1 to u1;
GRANT
postgres=# \c - u1
You are now connected to database "postgres" as user "u1".
postgres=> select * from t1;
id
----
(0 rows)
postgres=> \c - postgres
You are now connected to database "postgres" as user "postgres".
postgres=# reassign owned by u1 to u2;
REASSIGN OWNED
postgres=# \c - u2
You are now connected to database "postgres" as user "u2".
postgres=> select * from t1;
id
----
(0 rows)
postgres=>
參數
-
old_roleThe name of a role. The ownership of all the objects within the current database, and of all shared objects (databases, tablespaces), owned by this role will be reassigned to
new_role. -
new_roleThe name of the role that will be made the new owner of the affected objects.
注解
REASSIGN OWNED is often used to prepare for the removal of one or more roles. Because REASSIGN OWNED does not affect objects within other databases, it is usually necessary to execute this command in each database that contains objects owned by a role that is to be removed.
REASSIGN OWNED requires membership on both the source role(s) and the target role.
The DROP OWNEDcommand is an alternative that simply drops all the database objects owned by one or more roles.
The REASSIGN OWNED command does not affect any privileges granted to the old_roles on objects that are not owned by them. Likewise, it does not affect default privileges created with ALTER DEFAULT PRIVILEGES. Use DROP OWNED to revoke such privileges.
mydb=> \c mydb u1
You are now connected to database "mydb" as user "u1".
mydb=> create table t1(id int);
CREATE TABLE
mydb=> \c mydb postgres
You are now connected to database "mydb" as user "postgres".
mydb=# create table t2(id int);
CREATE TABLE
mydb=# grant select on t2 to u1;
GRANT
mydb=# \dt
List of relations
Schema | Name | Type | Owner
--------+------+-------+----------
public | t1 | table | u1
public | t2 | table | postgres
(2 rows)
mydb=# \dp t2
Access privileges
Schema | Name | Type | Access privileges | Column privileges | Policies
--------+------+-------+---------------------------+-------------------+----------
public | t2 | table | postgres=arwdDxt/postgres+| |
| | | u1=r/postgres | |
(1 row)
mydb=# reassign owned by u1 to u2;
REASSIGN OWNED
mydb=# \dt
List of relations
Schema | Name | Type | Owner
--------+------+-------+----------
public | t1 | table | u2
public | t2 | table | postgres
(2 rows)
mydb=# \dp t2
Access privileges
Schema | Name | Type | Access privileges | Column privileges | Policies
--------+------+-------+---------------------------+-------------------+----------
public | t2 | table | postgres=arwdDxt/postgres+| |
| | | u1=r/postgres | |
(1 row)
mydb=# drop user u1;
ERROR: role "u1" cannot be dropped because some objects depend on it
DETAIL: privileges for table t2
mydb=# drop owned by u1;
DROP OWNED
mydb=# \dp t2
Access privileges
Schema | Name | Type | Access privileges | Column privileges | Policies
--------+------+-------+---------------------------+-------------------+----------
public | t2 | table | postgres=arwdDxt/postgres | |
(1 row)
mydb=#
ALTER DEFAULT PRIVILEGES
mydb=# \c mydb u1
You are now connected to database "mydb" as user "u1".
mydb=> create table t1(id int);
CREATE TABLE
mydb=> \c mydb postgres
You are now connected to database "mydb" as user "postgres".
mydb=# create table t2(id int);
CREATE TABLE
mydb=# grant select on t2 to u1;
GRANT
mydb=# alter default privileges in schema public grant select on tables TO u1;
ALTER DEFAULT PRIVILEGES
mydb=# create table t3(id int);
CREATE TABLE
mydb=# \dt
List of relations
Schema | Name | Type | Owner
--------+------+-------+----------
public | t1 | table | u1
public | t2 | table | postgres
public | t3 | table | postgres
(3 rows)
mydb=# \dp t2
Access privileges
Schema | Name | Type | Access privileges | Column privileges | Policies
--------+------+-------+---------------------------+-------------------+----------
public | t2 | table | postgres=arwdDxt/postgres+| |
| | | u1=r/postgres | |
(1 row)
mydb=# \dp t3
Access privileges
Schema | Name | Type | Access privileges | Column privileges | Policies
--------+------+-------+---------------------------+-------------------+----------
public | t3 | table | postgres=arwdDxt/postgres+| |
| | | u1=r/postgres | |
(1 row)
mydb=# reassign owned by u1 to u2;;
REASSIGN OWNED
mydb=# \dt
List of relations
Schema | Name | Type | Owner
--------+------+-------+----------
public | t1 | table | u2
public | t2 | table | postgres
public | t3 | table | postgres
(3 rows)
mydb=# \dp t2
Access privileges
Schema | Name | Type | Access privileges | Column privileges | Policies
--------+------+-------+---------------------------+-------------------+----------
public | t2 | table | postgres=arwdDxt/postgres+| |
| | | u1=r/postgres | |
(1 row)
mydb=# \dp t3
Access privileges
Schema | Name | Type | Access privileges | Column privileges | Policies
--------+------+-------+---------------------------+-------------------+----------
public | t3 | table | postgres=arwdDxt/postgres+| |
| | | u1=r/postgres | |
(1 row)
mydb=#
兼容性
The REASSIGN OWNED command is a PostgreSQL extension.
