MariaDB 库的基本操作

MariaDB安装好以后,首先要创建一个数据库,这是使用MariaDB各种功能的基础和前提,本章将详细介绍数据的基本操作,主要内容有:创建数据库,删除数据库.

## 创建数据库

1.创建一个`lyshark`数据库.
```SQL
MariaDB [(none)]> create database lyshark charset utf8;
Query OK, 1 row affected (0.00 sec)
```
2.查看创建好的数据库lyshark的定义
```SQL
MariaDB [(none)]> show create database lysharkG
*************************** 1. row ***************************
Database: lyshark
Create Database: CREATE DATABASE `lyshark` /*!40100 DEFAULT CHARACTER SET gbk */
1 row in set (0.00 sec)
```

## 查询数据库

1.显示所有数据库
```SQL
MariaDB [(none)]> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| lyshark |
| mysql |
| performance_schema |
+--------------------+
4 rows in set (0.00 sec)

MariaDB [(none)]>
```
2.匹配以lys开头的数据库
```SQL
MariaDB [(none)]> show databases like 'lys%';
+-----------------+
| Database (lys%) |
+-----------------+
| lyshark |
+-----------------+
1 row in set (0.00 sec)

MariaDB [(none)]>
```

## 更新数据库

1.修改指定数据库的字符集为gbk
```SQL
MariaDB [(none)]> alter database lyshark charset gbk;
Query OK, 1 row affected (0.00 sec)
```

## 删除数据库

```SQL
MariaDB [(none)]> drop database lyshark;
Query OK, 0 rows affected (0.00 sec)

MariaDB [(none)]> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
+--------------------+
3 rows in set (0.00 sec)

MariaDB [(none)]>
```

**参考文献：mysql5.7从入门到精通**