openGauss每日一练第4天 | 使用多个用户访问同一个数据库

Table of Contents

• 数据准备：登录数据库并创建表空间music_tbs ，并在表空间中创建数据库musicdb2
• 1. 创建用户user1、user2、user3，授予user1、user2、user3数据库系统的SYSADMIN权限
• 2. 分别使用user1、user2、user3访问数据库musicdb2，创建各自的表，并插入数据。表名和数据如下：
• 3.使用某个（user3）用户，查看当前数据库musicdb2有哪些表

数据准备：登录数据库并创建表空间music_tbs ，并在表空间中创建数据库musicdb2

su - omm
gsql -r

进入数据库后创建表空间、测试数据库

CREATE TABLESPACE music_tbs RELATIVE LOCATION 'tablespace/test_ts1';
create database musicdb2 with tablespace music_tbs;

1. 创建用户user1、user2、user3，授予user1、user2、user3数据库系统的SYSADMIN权限

--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';
--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;

–执行下面的命令，查看有哪些用户：发现已经创建成功了
\du

2. 分别使用user1、user2、user3访问数据库musicdb2，创建各自的表，并插入数据。表名和数据如下：

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
（1）利用user1连接数据库musicdb2.并创建表products1。插入部分数据

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=> 
  

插入user1的数据：

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)

（2）利用user2连接数据库musicdb2.并创建表products2。插入部分数据。

musicdb2=> \c musicdb2 user2
Password for user user2: 
musicdb2=> 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)

（3）利用user3连接数据库musicdb2.并创建表products3。插入部分数据。

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=> 
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');
musicdb2=> INSERT 0 1

musicdb2=>  product_id |     product_name     |            category            
------------+----------------------+--------------------------------
       1502 | olympus camera       | electrncs                     
       1601 | lamaze               | toys                          
       1700 | wait interface       | Books                         
       1666 | harry potter         | toys  

musicdb2=>  

3.使用某个（user3）用户，查看当前数据库musicdb2有哪些表

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)