在python中使用mysql數據庫demo

mysql數據庫
版本：mysql Ver 8.0.12 for Win64 on x86_64 (MySQL Community Server - GPL)

0.免密登陸
mysql -u root -p
不輸密碼直接回車

1.創建表DB、用戶scraper1
CREATE DATABASE DB;

創建用戶：
create user 'scraper1'@'localhost' identified by 'passwd'
授予其所有權限：
grant all privileges on DB.* to 'scraper1'@'localhost' with grant option;

2.創建表users

 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')
     )
     engine=InnoDB default charset=utf8 collate=utf8_bin auto_increment=1;

通過pymysql模塊對mysql數據庫操作:

import pymysql.cursors


# 建立連接
connection = pymysql.connect(
			host = 'localhost',
			user = 'scraper1' ,
			password = 'passwd' ,
			db = 'DB' ,
			charset = 'utf8mb4' , 
			cursorclass = pymysql.cursors.DictCursor)
			
try :
	with connection.cursor() as cursor :	# 打開當前連接的cursor()
		sql = "INSERT INTO `users` (`email`,`password`) VALUES (%s, %s)"
		cursor.execute(sql, ('[email protected]','passwd'))	# 通過當前cursor()執行sql語句
		
	connection.commit()						# commit
	
	with connection.cursor() as cursor :
		sql = "SELECT `id` , `password` FROM `users` WHERE `email` = %s"
		cursor.execute(sql, ('[email protected]'))
		
		result = cursor.fetchone()		# 只取最上面的第一條結果,返回單個元組如('id','title')
		print(result)					# {'id': 1, 'password': 'passwd'}
except :
	connection.rollback()	# 回滾
finally:	
	connection.close()	# 關閉連接