课程学习内容
软件版本 ：openGauss 3.0.0
创建user1、user2、user3用户，验证数据库musicdb可以被用户user1、user2、user3访问（分别在数据库中创建了一张表、插入数据、进行查询）。即一个数据库可以被多个用户访问。
数据库实操内容
连接数据库
root@modb:~# su - omm
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=#
–进入数据库omm，创建表空间、测试数据库
drop DATABASE IF EXISTS musicdb;
drop DATABASE IF EXISTS musicdb1;
drop DATABASE IF EXISTS musicdb2;
drop DATABASE IF EXISTS musicdb3;
drop tablespace IF EXISTS music_tbs;
CREATE TABLESPACE music_tbs RELATIVE LOCATION ‘tablespace/test_ts1’;
CREATE DATABASE musicdb WITH TABLESPACE = music_tbs;
omm=# drop DATABASE IF EXISTS musicdb;
NOTICE: database "musicdb" does not exist, skipping
DROP DATABASE
omm=# drop DATABASE IF EXISTS musicdb1;
NOTICE: database "musicdb1" does not exist, skipping
DROP DATABASE
omm=# drop DATABASE IF EXISTS musicdb2;
NOTICE: database "musicdb2" does not exist, skipping
DROP DATABASE
omm=# drop DATABASE IF EXISTS musicdb3;
NOTICE: database "musicdb3" does not exist, skipping
DROP DATABASE
omm=# drop tablespace IF EXISTS music_tbs;
NOTICE: Tablespace "music_tbs" does not exist, skipping.
DROP TABLESPACE
omm=# CREATE TABLESPACE music_tbs RELATIVE LOCATION 'tablespace/test_ts1';
CREATE TABLESPACE
omm=# CREATE DATABASE musicdb2 WITH TABLESPACE = music_tbs;
CREATE DATABASE
omm=#
创建用户user1、user2、user3
–执行下面的SQL语句，创建用户user1、user2、user3：
CREATE USER user1 IDENTIFIED BY ‘kunpeng@1234’;
CREATE USER user2 IDENTIFIED BY ‘kunpeng@1234’;
CREATE USER user3 IDENTIFIED BY ‘kunpeng@1234’;
omm=# CREATE TABLESPACE music_tbs RELATIVE LOCATION 'tablespace/test_ts1';
CREATE TABLESPACE
omm=# CREATE DATABASE musicdb WITH TABLESPACE = music_tbs;
CREATE DATABASE
omm=# CREATE USER user1 IDENTIFIED BY 'kunpeng@1234';
NOTICE: The encrypted password contains MD5 ciphertext, which is not secure.
CREATE ROLE
omm=# CREATE USER user2 IDENTIFIED BY 'kunpeng@1234';
NOTICE: The encrypted password contains MD5 ciphertext, which is not secure.
CREATE ROLE
omm=# CREATE USER user3 IDENTIFIED BY 'kunpeng@1234';
NOTICE: The encrypted password contains MD5 ciphertext, which is not secure.
CREATE ROLE
omm=#
–授予user1、user2、user3数据库系统的SYSADMIN权限：
ALTER USER user1 SYSADMIN;
ALTER USER user2 SYSADMIN;
ALTER USER user3 SYSADMIN;
omm=# ALTER USER user1 SYSADMIN;
ALTER ROLE
omm=# ALTER USER user2 SYSADMIN;
ALTER ROLE
omm=# ALTER USER user3 SYSADMIN;
ALTER ROLE
omm=#
–执行下面的命令，查看有哪些用户：
\du
omm=# \du
List of roles
Role name | Attributes | Member of
-----------+------------------------------------------------------------------------------------------------------------------+-----------
gaussdb | Sysadmin | {}
omm | Sysadmin, Create role, Create DB, Replication, Administer audit, Monitoradmin, Operatoradmin, Policyadmin, UseFT | {}
user1 | Sysadmin | {}
user2 | Sysadmin | {}
user3 | Sysadmin | {}
omm=#
在终端中，分别使用user1、user2、user3用户访问数据库musicdb2
表名分别为： products1、 products2、 products3
| 字段名 | 数据类型 | 含义 |
|---|---|---|
| product_id | INTEGER | 产品编号 |
| product_name | Char(20) | 产品名 |
| category | Char(30) | 种类 |
向表中插入数据：
| product_id | product_name | category |
|---|---|---|
| 1502 | olympus camera | electrncs |
| 1601 | lamaze | toys |
| 1700 | wait interface | Books |
| 1666 | harry potter | toys |
–以用户user1的身份在数据库musicdb2中创建表products1，并插入四条数据：
\c musicdb2 user1
create table products1(product_id INTEGER,product_name char(20),category char(30));
insert into products1 values(1502,‘olympus camera’,‘electrncs’);
insert into products1 values(1601,‘lamaze’,‘toys’);
insert into products1 values(1700,‘wait interface’,‘Books’);
insert into products1 values(1666,‘harry potter’,‘toys’);
select * from products1;
omm=# \c musicdb2 user1
Password for user user1:
Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "musicdb2" as user "user1".
musicdb2=> create table products1(product_id INTEGER,product_name char(20),category char(30));
CREATE TABLE
musicdb2=> insert into products1 values(1502,'olympus camera','electrncs');
INSERT 0 1
musicdb2=> insert into products1 values(1601,'lamaze','toys');
INSERT 0 1
musicdb2=> insert into products1 values(1700,'wait interface','Books');
INSERT 0 1
musicdb2=> insert into products1 values(1666,'harry potter','toys');
INSERT 0 1
musicdb2=> select * from products1;
product_id | product_name | category
------------+----------------------+--------------------------------
1502 | olympus camera | electrncs
1601 | lamaze | toys
1700 | wait interface | Books
1666 | harry potter | toys
(4 rows)
musicdb2=>
–以用户user2的身份在数据库musicdb2中创建表products2，并插入四条数据：
create table products2(product_id INTEGER,product_name char(20),category char(30));
insert into products2 values(1502,‘olympus camera’,‘electrncs’);
insert into products2 values(1601,‘lamaze’,‘toys’);
insert into products2 values(1700,‘wait interface’,‘Books’);
insert into products2 values(1666,‘harry potter’,‘toys’);
select * from products2;
musicdb2=> \c musicdb2 user2;
Password for user user2:
Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "musicdb2" as user "user2".
musicdb2=> create table products2(product_id INTEGER,product_name char(20),category char(30));
CREATE TABLE
musicdb2=> insert into products2 values(1502,'olympus camera','electrncs');
INSERT 0 1
musicdb2=> insert into products2 values(1601,'lamaze','toys');
INSERT 0 1
musicdb2=> insert into products2 values(1700,'wait interface','Books');
INSERT 0 1
musicdb2=> insert into products2 values(1666,'harry potter','toys');
INSERT 0 1
musicdb2=> select * from products2;
product_id | product_name | category
------------+----------------------+--------------------------------
1502 | olympus camera | electrncs
1601 | lamaze | toys
1700 | wait interface | Books
1666 | harry potter | toys
(4 rows)
musicdb2=>
–以用户user3的身份在数据库musicdb2中创建表products3，并插入一条数据：
create table products3(product_id INTEGER,product_name char(20),category char(30));
insert into products3 values(1502,‘olympus camera’,‘electrncs’);
insert into products3 values(1601,‘lamaze’,‘toys’);
insert into products3 values(1700,‘wait interface’,‘Books’);
insert into products3 values(1666,‘harry potter’,‘toys’);
select * from products3;
musicdb2=> \c musicdb2 user3;
Password for user user3:
Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "musicdb2" as user "user3".
musicdb2=> create table products3(product_id INTEGER,product_name char(20),category char(30));
CREATE TABLE
musicdb2=> insert into products3 values(1502,'olympus camera','electrncs');
INSERT 0 1
musicdb2=> insert into products3 values(1601,'lamaze','toys');
INSERT 0 1
musicdb2=> insert into products3 values(1700,'wait interface','Books');
INSERT 0 1
musicdb2=> insert into products3 values(1666,'harry potter','toys');
INSERT 0 1
musicdb2=> select * from products3;
product_id | product_name | category
------------+----------------------+--------------------------------
1502 | olympus camera | electrncs
1601 | lamaze | toys
1700 | wait interface | Books
1666 | harry potter | toys
(4 rows)
musicdb2=>
user1、user2、user3用户分别登录，查看当前数据库musicdb有哪些表
\dt
musicdb2=> \c musicdb2 user1;
Password for user user1:
Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "musicdb2" as user "user1".
musicdb2=> \dt
List of relations
Schema | Name | Type | Owner | Storage
--------+-----------+-------+-------+----------------------------------
public | products1 | table | user1 | {orientation=row,compression=no}
public | products2 | table | user2 | {orientation=row,compression=no}
public | products3 | table | user3 | {orientation=row,compression=no}
(3 rows)
musicdb2=> \c mus\c musicdb2 user2;
Password for user user2:
Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "musicdb2" as user "user2".
musicdb2=> \dt
List of relations
Schema | Name | Type | Owner | Storage
--------+-----------+-------+-------+----------------------------------
public | products1 | table | user1 | {orientation=row,compression=no}
public | products2 | table | user2 | {orientation=row,compression=no}
public | products3 | table | user3 | {orientation=row,compression=no}
(3 rows)
musicdb2=> \c musicdb2 user3;
Password for user user3:
Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "musicdb2" as user "user3".
musicdb2=> \dt
List of relations
Schema | Name | Type | Owner | Storage
--------+-----------+-------+-------+----------------------------------
public | products1 | table | user1 | {orientation=row,compression=no}
public | products2 | table | user2 | {orientation=row,compression=no}
public | products3 | table | user3 | {orientation=row,compression=no}
(3 rows)
musicdb2=>
课程学习心得
通过本次的实训操作，学会了在数据库创建用户并授权用户sysadmin权限操作，而且在各自用户创建的数据库库插入数据和查询字段内容。
