python3连接MySQL数据库

MySQL安装 请看  Window下安装MySQL

1. 首先要下载mysql数据库连接驱动，mysql驱动有三个，只需安装其中一个：MySQLdb、pymysql、mysql-connector（官网提供）。通过命令行pip安装，安装命令如下：

   pip install mysql-connector
   

    

2. 创建数据库student_db, user=“改成你的mysql用户名”，passwd=“改成你设的密码”，我的passwd没有设置密码。

   #!/usr/bin/python3
   
   import mysql.connector
   
   mydb = mysql.connector.connect(
   host="localhost",
   user="root",
   passwd="")
   mycursor = mydb.cursor()
   mycursor.execute("create database student_db")

3. 创建student表，属性：name，sex，age，cellPhone

#!/usr/bin/python3

import mysql.connector

db = mysql.connector.connect(host="localhost", user="root", passwd="",database="student_db")

cursor = db.cursor()
cursor.execute("create table student(name varchar(40), sex char(2), age int, cellPhone double)")
db.close()

4. 向student表插入数据

#!/usr/bin/python3

import mysql.connector

testdb = mysql.connector.connect(host='localhost', user='root', passwd='',database='student_db')
testcursor = testdb.cursor()
testcursor.execute("insert into student(name, sex, age, cellPhone) values("小明", "M", 21, 13577776666)")

5. 给student表添加主键

#!/usr/bin/python3

import mysql.connector

testdb = mysql.connector.connect(host='localhost', user='root', passwd='',database='student_db')
testcursor = testdb.cursor()
testcursor.execute("alter table student add column id int auto_increment primary key")

使用MySQLdb 驱动连接mysql，记得使用前先安装MySQLdb驱动（pip install MySQLdb）和mysql数据库。先创建TESTDB数据库，再创建teacher表，之后再进行如下操作。

#!/usr/bin/python3
#-*- coding: utf-8 -*-
import MySQLdb

db = MySQLdb.connect("localhost", "root", "", "TESTDB")

cursor = db.cursor()

sql = """insert into teacher (first_name, last_name,age,sex, income)
values('Mac', 'Tom', 21, 'M', 3000),('Chan', 'Jim', 23, 'M', 5000)"""

try:
	cursor.execute(sql)
	# 提交到数据库
	db.commit()
	print("提交成功！")
except:
	# 出错回滚
	db.rollback()
	print("提交失败！")
	
cursor.close()
db.close()

使用pymysql 驱动连接mysql，记得使用前先安装pymysql驱动（pip install pymysql）和mysql数据库。更新teacher表

#！/usr/bin/python3
import pymysql

db = pymysql.connect("localhost", "root", "", "TESTDB")

cursor = db.cursor()

sql = "update teacher set age = age + 1 where sex = '%c'" % ('M')

try:
	cursor.execute(sql)
	db.commit()
	print("更新成功！")
except:
	db.rollback()
	print("更新失败！")
	
cursor.close()
db.close()