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### 1、数据库的常用操作
* 登录mysql数据库

```bash
mysql -uroot -p
# 然后输入密码：
```

如：

```bash
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)

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

```bash
exit;
```

* 查看有哪些数据库：

```bash
show databases;
```

如：

mysql>
```

* 查看数据库的当前时间

```bash
select now();
```

如：

```bash
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

```bash
select version();
```

如：

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

mysql>
```

* 创建数据库

```bash
create database 数据库名 charset=utf8;
```

如：

```bash
mysql> create database demo charset=utf8;
Query OK, 1 row affected (0.01 sec)

mysql>
```

* 删除数据库

```bash
drop database 数据库名;
```

如：

```bash
mysql> drop database demo;
Query OK, 0 rows affected (0.00 sec)

mysql>
```

* 查看当前的数据库

```bash
select database();
```

如：

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

mysql>
```

* 使用数据库

```bash
use 数据库名;
```

如：

```bash
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>
```

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