1、数据库的常用操作

• 登录mysql数据库

mysql -uroot -p
# 然后输入密码：

如：

root@a8226422817e:/# mysql -uroot -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 1094
Server version: 5.7.36 MySQL Community Server (GPL)
Copyright (c) 2000, 2021, Oracle and/or its affiliates.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql>

• 退出数据库

exit;

• 查看有哪些数据库：

show databases;

如：

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| blog_redrose2100   |
| mysql              |
| performance_schema |
| sys                |
+--------------------+
5 rows in set (0.01 sec)
mysql>

• 查看数据库的当前时间

select now();

如：

mysql> select now();
+---------------------+
| now()               |
+---------------------+
| 2022-05-05 03:08:39 |
+---------------------+
1 row in set (0.00 sec)
mysql>

• 查看当前数据安装软件的版本

select version();

如：

mysql> select version();
+-----------+
| version() |
+-----------+
| 5.7.36    |
+-----------+
1 row in set (0.00 sec)
mysql>

• 创建数据库

create database 数据库名 charset=utf8;

如：

mysql> create database demo charset=utf8;
Query OK, 1 row affected (0.01 sec)
mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| blog_redrose2100   |
| demo               |
| mysql              |
| performance_schema |
| sys                |
+--------------------+
6 rows in set (0.00 sec)
mysql>

• 删除数据库

drop database 数据库名;

如：

mysql> drop database demo;
Query OK, 0 rows affected (0.00 sec)
mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| blog_redrose2100   |
| mysql              |
| performance_schema |
| sys                |
+--------------------+
5 rows in set (0.00 sec)
mysql>

• 查看当前的数据库

select database();

如：

mysql> select database();
+------------+
| database() |
+------------+
| NULL       |
+------------+
1 row in set (0.00 sec)
mysql>

• 使用数据库

use 数据库名;

如：

mysql> use blog_redrose2100;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> select database();
+------------------+
| database()       |
+------------------+
| blog_redrose2100 |
+------------------+
1 row in set (0.00 sec)
mysql>