openGauss每日一练第12天-模式管理

1.创建一个名为testsm、testsm1的模式

omm=# create schema testsm;
CREATE SCHEMA
omm=# create schema testsm1;
CREATE SCHEMA

2.创建一个用户john, 并将testsm的owner修改为
john，且修改owner前后分别使用\dn+查看模式信息

omm=# create user john identified by 'kunpeng@1234';
NOTICE:  The encrypted password contains MD5 ciphertext, which is not secure.
CREATE ROLE
omm=# alter user john sysadmin;
ALTER ROLE
omm-# \dn+
                                         List of schemas
      Name       | Owner | Access privileges |           Description            | WithBlockChain 
-----------------+-------+-------------------+----------------------------------+----------------
 blockchain      | omm   |                   | blockchain schema                | f
 cstore          | omm   |                   | reserved schema for DELTA tables | f
 db4ai           | omm   | omm=UC/omm       +| db4ai schema                     | f
                 |       | =U/omm            |                                  | 
 dbe_perf        | omm   |                   | dbe_perf schema                  | f
 dbe_pldebugger  | omm   | omm=UC/omm       +| dbe_pldebugger schema            | f
                 |       | =U/omm            |                                  | 
 dbe_pldeveloper | omm   | omm=UC/omm       +| dbe_pldeveloper schema           | f
                 |       | =U/omm            |                                  | 
 john            | john  |                   |                                  | f
 pkg_service     | omm   |                   | pkg_service schema               | f
 public          | omm   | omm=UC/omm       +| standard public schema           | f
                 |       | =U/omm            |                                  | 
 snapshot        | omm   |                   | snapshot schema                  | f
 sqladvisor      | omm   | omm=UC/omm       +| sqladvisor schema                | f
                 |       | =U/omm            |                                  | 


 testsm          | omm   |                   |                                  | f
 testsm1         | omm   |                   |                                  | f
(13 rows)omm-# 

omm=# alter schema testsm owner to john;  
ALTER SCHEMA

omm=# \dn+ testsm
                          List of schemas
  Name  | Owner | Access privileges | Description | WithBlockChain 
--------+-------+-------------------+-------------+----------------
 testsm | john  |                   |             | f
(1 row)

3.重命名testsm为testsm2

omm=# alter schema testsm rename to testsm2;
ALTER SCHEMA
omm=# \dn
     List of schemas
      Name       | Owner 
-----------------+-------
 blockchain      | omm
 cstore          | omm
 db4ai           | omm
 dbe_perf        | omm
 dbe_pldebugger  | omm
 dbe_pldeveloper | omm
 john            | john
 pkg_service     | omm
 public          | omm
 snapshot        | omm
 sqladvisor      | omm
 testsm1         | omm
 testsm2         | john
(13 rows)

4.在模式testsm1中建表t1、插入记录和查询记录

omm=# create table testsm1.t1(c1 int);
CREATE TABLE
omm=# insert into testsm1.t1 values(1);
INSERT 0 1
omm=# select * from testsm1.t1;
 c1 
----
  1
(1 row)

5.在会话级设置模式搜索顺序

omm=# select * from t1;
ERROR:  relation "t1" does not exist on gaussdb
LINE 1: select * from t1;
                      ^
omm=# set search_path to testsm1;
SET
omm=# select * from t1;
 c1 
----
  1
(1 row)
omm=# show search_path;
 search_path 
-------------
 testsm1
(1 row)
\dt

6.在数据库级设置模式搜索顺序

mm=# alter database omm set search_path to testsm1;
ALTER DATABASE
omm=# \q
omm@modb:~$ gsql -r
gsql ((openGauss 3.0.0 build 02c14696) compiled at 2022-04-01 18:12:00 commit 0 last mr  )
Non-SSL connection (SSL connection is recommended when requiring high-security)
Type "help" for help.

omm=# show search_path;
 search_path 
-------------
 testsm1
(1 row)

7.在用户级设置模式搜索顺序

omm=# alter user john set search_path to testsm2;
ALTER ROLE
omm=# \q
omm@modb:~$ gsql -d omm -U john -W kunpeng@1234 -r
gsql ((openGauss 3.0.0 build 02c14696) compiled at 2022-04-01 18:12:00 commit 0 last mr  )
Non-SSL connection (SSL connection is recommended when requiring high-security)
Type "help" for help.

omm=> show search_path;
omm=>  search_path 
-------------
 testsm2
(1 row)