用Python操纵数据库MySql的基本操作

用Python操作MySql需要用Python的第三方模块pymysql,可以利用pip命令进行安装(pip install pymysql)，下面简单列出pymysql的一些基本用法：

1.新建一张表

import pymysql.cursors
db = pymysql.connect(host="localhost", user="root", password="password", db="mysql",charset='utf8mb4')
cursor = db.cursor()
# 使用 execute() 方法执行 SQL，如果表存在则删除
cursor.execute("drop table if exists users")
# 使用预处理语句创建表
sql = """CREATE TABLE users (
         id  int(11) NOT NULL AUTO_INCREMENT,
         email  VARCHAR(255) COLLATE utf8_bin NOT NULL,
         password VARCHAR(255) COLLATE utf8_bin NOT NULL,
	 PRIMARY KEY(id)	
          )"""
cursor.execute(sql)
# 关闭数据库连接
db.close()

2.向表中插入数据以及进行查找：

import pymysql.cursors

# Connect to the database
connection = pymysql.connect(host='localhost',
                             user='user',
                             password='password',
                             db='mysql',
                             charset='utf8mb4',
                             )

try:
    with connection.cursor() as cursor:
        # Create a new record
        sql = "INSERT INTO `users` (`email`, `password`) VALUES (%s, %s)"
        cursor.execute(sql, ('[email protected]', 'very-secret'))

    # connection is not autocommit by default. So you must commit to save
    # your changes.
    connection.commit()
    with connection.cursor() as cursor:
        # Read a single record
        sql = "SELECT `id`, `password` FROM `users` WHERE `email`=%s"
        cursor.execute(sql, ('[email protected]',))
        result = cursor.fetchone()
        print(result)
finally:
    connection.close()

注：以上就是pymysql的一些基本操作，删除和更改也基本类似于插入操作，为了避免运行中出现错误，应尽量使用with语句，并使用try-finally结构。