课程作业
1.gsql命令连到数据库omm
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.
2.查看数据库的版本、版权信息
omm=# select version();
(openGauss 3.0.0 build 02c14696) compiled at 2022-04-01 18:12:00 commit 0
last mr on aarch64-unknown-linux-gnu, compiled by g++ (GCC) 7.3.0, 64-bit
(1 row)
omm=# show server_version;
server_version
----------------
9.2.4
(1 row)
omm=# \copyright
GaussDB Kernel Database Management System
Copyright (c) Huawei Technologies Co., Ltd. 2018. All rights reserved.
omm=#
3.常见元命令使用
omm=# \l
List of databases
Name | Owner | Encoding | Collate | Ctype | Access privileges
-----------+-------+----------+---------+-------+-------------------
omm | omm | UTF8 | C | C |
postgres | omm | UTF8 | C | C |
template0 | omm | UTF8 | C | C | =c/omm +
| | | | | omm=CTc/omm
template1 | omm | UTF8 | C | C | =c/omm +
| | | | | omm=CTc/omm
(4 rows)
omm=# \conninfo
You are connected to database "omm" as user "omm" via socket in "/tmp" at port "5432".
omm=# omm-# CREATE TABLE customer_t
( c_customer_sk integer,
omm(# c_customer_id char(5),
omm(# c_first_name char(6),
omm(# c_last_name char(8)
omm(# ) ;
CREATE TABLE
omm=# INSERT INTO customer_t (c_customer_sk, c_customer_id, c_first_name,c_last_name) VALUES (3769, 5, 'Grace','White');
INSERT 0 1
omm=# \dt
List of relations
Schema | Name | Type | Owner | Storage
--------+------------+-------+-------+----------------------------------
public | customer_t | table | omm | {orientation=row,compression=no}
(1 row)
omm=# \d customer_t
Table "public.customer_t"
Column | Type | Modifiers
---------------+--------------+-----------
c_customer_sk | integer |
c_customer_id | character(5) |
c_first_name | character(6) |
c_last_name | character(8) |
omm=# \di
No relations found.
omm=# Border style is 2.
omm=# \pset border 2
omm=#
omm=# SELECT * FROM customer_t;
+---------------+---------------+--------------+-------------+
| c_customer_sk | c_customer_id | c_first_name | c_last_name |
+---------------+---------------+--------------+-------------+
| 3769 | 5 | Grace | White |
+---------------+---------------+--------------+-------------+
(1 row)
omm=# \x
Expanded display is on.
omm=# SELECT * FROM customer_t;
+-[ RECORD 1 ]--+----------+
| c_customer_sk | 3769 |
| c_customer_id | 5 |
| c_first_name | Grace |
| c_last_name | White |
+---------------+----------+
omm=#
4.使用两种方法，连到postgres数据库中
omm=# \c postgres
Non-SSL connection (SSL connection is recommended when requiring high-security)
ou are now connected to database "postgres" as user "omm".
omm@modb:~$ gsql -d postgres -p 5432 -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.
5.测试gsql中的默认事务自动提交功能
omm@modb:~$ gsql -d omm -p 5432 -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 AUTOCOMMIT;
autocommit
------------
on
(1 row)
omm=# create table customer_new as select * from customer_t;
INSERT 0 1
omm=# \q
omm@modb:~$ gsql -d omm -p 5432 -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)
ype “help” for help.
omm=# \dt
List of relations
Schema | Name | Type | Owner | Storage
--------+--------------+-------+-------+----------------------------------
public | customer_new | table | omm | {orientation=row,compression=no}
public | customer_t | table | omm | {orientation=row,compression=no}
(2 rows)
omm=#
6.测试gsql中的事务手动提交功能
omm=# \set AUTOCOMMIT off
omm=# INSERT INTO customer_t (c_customer_sk, c_customer_id, c_first_name,c_last_name) VALUES
omm-# (6885, 1, 'Joes', 'Hunter'),
omm-# (4321, 2, 'Lily','Carter'),
omm-# (9527, 3, 'James', 'Cook'),
omm-# (9500, 4, 'Lucy', 'Baker');
omm=# INSERT 0 4
omm=#
omm=#
omm=# select * from customer_t;
c_customer_sk | c_customer_id | c_first_name | c_last_name
---------------+---------------+--------------+-------------
3769 | 5 | Grace | White
6885 | 1 | Joes | Hunter
omm=# 4321 | 2 | Lily | Carter
9527 | 3 | James | Cook
9500 | 4 | Lucy | Baker
(5 rows)
omm=# ROLLBACK;
ROLLBACK
omm=# SELECT * FROM customer_t;
omm=# c_customer_sk | c_customer_id | c_first_name | c_last_name
---------------+---------------+--------------+-------------
3769 | 5 | Grace | White
(1 row)
7.了解gsql相关帮助
omm=# \h
Available help:
ABORT BEGIN CREATE TABLESPACE DROP TEXT SEARCH CONFIGURATION
ALTER APP WORKLOAD GROUP CALL CREATE TEXT SEARCH CONFIGURATION DROP TEXT SEARCH DICTIONARY
ALTER APP WORKLOAD GROUP MAPPING CHECKPOINT CREATE TEXT SEARCH DICTIONARY DROP TRIGGER
ALTER AUDIT POLICY CLEAN CONNECTION CREATE TRIGGER DROP TYPE
ALTER DATA SOURCE CLOSE CREATE TYPE DROP USER
ALTER DATABASE CLUSTER CREATE USER DROP VIEW
ALTER DEFAULT PRIVILEGES COMMENT CREATE VIEW DROP WEAK PASSWORD DICTIONARY
ALTER DIRECTORY COMMIT CREATE WEAK PASSWORD DICTIONARY DROP WORKLOAD GROUP
ALTER EXTENSION COMMIT PREPARED CREATE WORKLOAD
omm=# \?
General
\copyright show openGauss usage and distribution terms
\g [FILE] or ; execute query (and send results to file or |pipe)
\qecho [STRING] write string to query output stream (see \o)
--More-- \h(\help) [NAME] help on syntax of SQL commands, * for all commands
\parallel [on [num]|off] toggle status of execute (currently off)
\q quit gsql
omm@modb:~$ gsql --help
General options:
-c, --command=COMMAND run only single command (SQL or internal) and exit
gsql is the openGauss interactive terminal.
Usage:
gsql [OPTION]... [DBNAME [USERNAME]]
-d, --dbname=DBNAME database name to connect to (default: "omm")
-f, --file=FILENAME execute commands from file, then exit
-l, --list list available databases, then exit
-v, --set=, --variable=NAME=VALUE
set gsql variable NAME to VALUE
-V, --version output version information, then exit
-X, --no-gsqlrc do not read startup file (~/.gsqlrc)
-e, --echo-queries echo commands sent to server
-E, --echo-hidden display queries that internal commands generate
-k, --with-key=KEY the key for decrypting the encrypted file
-L, --log-file=FILENAME send session log to file
-m, --maintenance can connect to cluster during 2-pc transaction recovery
-n, --no-libedit disable enhanced command line editing (libedit)
-o, --output=FILENAME send query results to file (or |pipe)
-q, --quiet run quietly (no messages, only query output)
-1 ("one"), --single-transaction
execute command file as a single transaction
-?, --help show this help, then exit
最后修改时间：2022-11-26 11:30:00
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