import mysql.connector 
cnx = mysql.connector.connect(user='scott', password='password', host='127.0.0.1', database='employees')
cnx.close()

from mysql.connector import (connection) 
cnx = connection.MySQLConnection(user='scott', password='password', host='127.0.0.1', database='employees') 
cnx.close()

import mysql.connector 
from mysql.connector import errorcode 
try: 
 cnx = mysql.connector.connect(user='scott', database='employ') 
except mysql.connector.Error as err: 
 if err.errno == errorcode.ER_ACCESS_DENIED_ERROR: 
 print("Something is wrong with your user name or password") 
 elif err.errno == errorcode.ER_BAD_DB_ERROR: 
 print("Database does not exist") 
 else: 
 print(err) 
else: 
cnx.close()

import mysql.connector
myconn=mysql.connector.connect(host="localhost",user="lucy",passwd="123455",database="holiday")
mycursor=myconn.cursor()
my_cmd_sql="select * from birthday"
a=mycursor.execute(my_cmd_sql) #执行SQL命令
for a in mycursor:    #展示请求数据
  print(a)
mycursor.close()     #指针必须关闭
myconn.close()      #连接必须关闭