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接着昨天继续学习openGauss,今天是第五天了。今天学习内容是使用一个用户访问多个数据库。
老规矩，先登陆墨天轮为我准备的实训实验室

root@modb:~# su - omm
omm@modb:~$ gsql -r

创建表空间music_tbs、数据库musicdb10 、用户user10 并赋予 sysadmin权限

omm=# CREATE TABLESPACE music_tbs RELATIVE LOCATION 'tablespace/test_ts1';
CREATE TABLESPACE
omm=# CREATE DATABASE musicdb10 WITH TABLESPACE = music_tbs;
CREATE DATABASE
omm=#  CREATE USER user10 IDENTIFIED BY 'user10@1234';
NOTICE:  The encrypted password contains MD5 ciphertext, which is not secure.
CREATE ROLE
omm=# ALTER USER user10 SYSADMIN;
ALTER ROLE

以用户user10 -的身份在数据库postgres 中创建表products1，并插入一条数据

omm=# \c postgres  user10
Password for user user10: 
Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "postgres" as user "user10".
openGauss=> create table products1 (product_id int,product_name char(20),category char(30) );
CREATE TABLE
openGauss=> insert into products1  values(1502,'olympus camera','electrncs');
INSERT 0 1
openGauss=> select * from products1 ;product_id |     product_name     |            category            
------------+----------------------+--------------------------------1502 | olympus camera       | electrncs                     
(1 row)                     

以用户user10 -的身份在数据库omm 中创建表products1，并插入一条数据

openGauss=> \c omm user10
Password for user user10: 
Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "omm" as user "user10".
omm=> create table products1 (product_id int,product_name char(20),category char(30) );
CREATE TABLE
omm=> insert into products1  values(1502,'olympus camera','electrncs');
INSERT 0 1
omm=> select * from products1 ;product_id |     product_name     |            category            
------------+----------------------+--------------------------------1502 | olympus camera       | electrncs                     
(1 row)                     

以用户user10 -的身份在数据库musicdb10 中创建表products1，并插入一条数据

omm=>  \c musicdb10 user10
Password for user user10: 
Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "musicdb10" as user "user10".
musicdb10=> 
musicdb10=> create table products1 (product_id int,product_name char(20),category char(30) );
CREATE TABLE
musicdb10=> insert into products1  values(1502,'olympus camera','electrncs');
INSERT 0 1
musicdb10=> select * from products1 ;product_id |     product_name     |            category            
------------+----------------------+--------------------------------1502 | olympus camera       | electrncs                     
(1 row)                     

总结

今天学习内容非常简单，还是以创建用户，创建数据库，授予权限，建表，插入数据为主。多多练习。