课程作业

1.创建一个名为testsm、testsm1的模式

omm=# create schema testsm;
CREATE SCHEMA
omm=# create schema  testsm1;
CREATE SCHEMA
omm=# \dn
	 List of schemas
  	Name       | Owner 
-----------------+-------
blockchain      | omm
cstore          | omm
db4ai           | omm
dbe_perf        | omm
dbe_pldebugger  | omm
dbe_pldeveloper | omm
pkg_service     | omm
public          | omm
snapshot        | omm
sqladvisor      | omm
testsm          | omm
testsm1         | omm
(12 rows)

omm=# 

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=# alter schema testsm owner to john;
ALTER SCHEMA

3.重命名testsm为testsm2

omm=# alter schema testsm rename to testsm2;
ALTER SCHEMA

4.在模式testsm1中建表t1、插入记录和查询记录

omm=# create table testsm1.t1(col1 char(10));
CREATE TABLE
omm=# insert into testsm1.t1 values ('a');
INSERT 0 1
omm=# select * from testsm1.t1;
 col1    
------------
a         
(1 row)

5.在会话级设置模式搜索顺序

omm=# SET SEARCH_PATH TO testsm1;
omm=# SET

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

6.在数据库级设置模式搜索顺序

omm=# 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=# \c omm john
Password for user john: 
Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "omm" as user "john".
omm=> show SEARCH_PATH;
omm=>  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 testsm1;
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 
-------------
testsm1
(1 row)