MySQL内置客户端操作

• 查看系统数据库。

show databases

• 创建数据库

CREATE TABLE 数据库 DEFAULT CHARSET utf8 COLLATE utf8_general_ci;

使用utf8编码，避免中文汉字问题。COLLATE 影响排序规则。

• 删除数据库

DROP DATABASE 数据库名

CREATE DATABASE day25db DEFAULT CHARSET utf8 COLLATE utf8_general_ci;
Query OK, 1 row affected (0.01 sec)

mysql> SHOW DATABASES;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| day25db            |
| mysql              |
| performance_schema |
| sys                |
+--------------------+
5 rows in set (0.00 sec)

DROP DATABASE day25db;

Query OK, 0 rows affected (0.02 sec)

• 进入数据库

use 数据库名

• 查看数据库中的表

show tables

mysql> use information_schema
Database changed
mysql> show tables;
+---------------------------------------+
| Tables_in_information_schema          |
+---------------------------------------+
| CHARACTER_SETS                        |
| COLLATIONS                            |
| COLLATION_CHARACTER_SET_APPLICABILITY |
| INNODB_SYS_FOREIGN                    |
| INNODB_SYS_TABLESTATS                 |
+---------------------------------------+

Python操作

#安装pymysql模块

LeodeMBP:~ leo$ pip3 install pymysql
Collecting pymysql
  Downloading PyMySQL-1.0.2-py3-none-any.whl (43 kB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 43.8/43.8 KB 67.5 kB/s eta 0:00:00
Installing collected packages: pymysql
Successfully installed pymysql-1.0.2

#导入pymysql
import pymysql

#建立数据库链接对象至mysql数据库
conn = pymysql.connect(host = '127.0.0.1' , port = 3306, user = 'root' , passwd = 'root123' , charset = 'utf8')

#建立游标对象，基于游标可以发送指令。
cursor = conn.cursor()

#查看系统的数据库
cursor.execute('show databases')
result = cursor.fetchall()
print(result)
(('information_schema',), ('day25db',), ('mysql',), ('performance_schema',), ('sys',))　　

　#创建数据库

　cursor.execute("CREATE DATABASE day25db DEFAULT CHARSET utf8 COLLATE utf8_general_ci")

　conn.commit()  #提交事务来保存更改

 #删除数据库

  cursor.execute("DROP DATABASE day25db")

  conn.commit()

　#进入数据库，查看所有表

　cursor.execute("use mysql")

　cursor.execute("show tables")

　result = cursor.fetchall()

　print(result)

　#关闭链接

　cursor.close()

　conn.close()