python3連接MySQL8.0

python3連接MySQL8.0

1、下載MySQL官方的mysql-connector-python-8.0.17-py3.7-windows-x86-64bit.msi，直接點擊安裝；
2、安裝完畢後直接可以導入mysql.connnector模塊
連接方式一：

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

連接方式二：

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

用try~except獲取錯誤代碼：

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()

3、獲取數據庫數據：

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)  #執行SQL命令
for a in mycursor:        #展示請求數據
    print(a)
mycursor.close()         #指針必須關閉
myconn.close()           #連接必須關閉

4、插入、更改和刪除數據
跟上面一樣的方法執行插入、更改和數據命令，這裏有一點區別，execute語句後必須調用連接的.commit()方法確認執行。
另外：指針一定要關閉，否則容易引起
mysql 2014 error (2014) Commands out of sync; You can’t run this command now