python3連接MySQL數據庫

MySQL安裝 請看  Window下安裝MySQL

1. 首先要下載mysql數據庫連接驅動，mysql驅動有三個，只需安裝其中一個：MySQLdb、pymysql、mysql-connector（官網提供）。通過命令行pip安裝，安裝命令如下：

   pip install mysql-connector
   

    

2. 創建數據庫student_db, user=“改成你的mysql用戶名”，passwd=“改成你設的密碼”，我的passwd沒有設置密碼。

   #!/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. 創建student表，屬性：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表插入數據

#!/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. 給student表添加主鍵

#!/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 驅動連接mysql，記得使用前先安裝MySQLdb驅動（pip install MySQLdb）和mysql數據庫。先創建TESTDB數據庫，再創建teacher表，之後再進行如下操作。

#!/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)
	# 提交到數據庫
	db.commit()
	print("提交成功！")
except:
	# 出錯回滾
	db.rollback()
	print("提交失敗！")
	
cursor.close()
db.close()

使用pymysql 驅動連接mysql，記得使用前先安裝pymysql驅動（pip install pymysql）和mysql數據庫。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("更新失敗！")
	
cursor.close()
db.close()