python如何使用mysql_Python如何操作MySQL
安装Mysql和Navicat for MySQL
Python链接Mysql的增删改查
通过Python提供的pymysql模块实现对mysql数据库的操作，这个地方注意python3.x使用的是pymysql，python2.x的话使用mysqldb模块
安装pymysql模块：pip install PyMySQL
import pymysql
# 创建连接
conn = pymysql.connect(host='127.0.0.1', port=3306, user='root', passwd='123456', db='student')
# 创建游标
cursor = conn.cursor()
# 修改----执行SQL，并返回受影响行数
# effect_row = cursor.execute("update user set name=%s,pwd=%s where id=%s", ('aaa','bb', 1))
# 添加----执行SQL，并返回受影响行数
# cursor.execute("insert into user (name, pwd) values (%s,%s)", ("lidao","aaa"))
# 查询----
cursor.execute("select * from user")
stus = cursor.fetchall()
for stu in stus:
print("id:%d; name: %s; pwd: %s; " %(stu[0], stu[1], stu[2]))
# 删除---执行SQL，并返回受影响行数
cursor.execute("delete from user where id=%s", (2))
# 提交，不然无法保存新建或者修改的数据
conn.commit()
#如果不加这个就手动添加autocommit=True 自动提交
#db=pymysql.connect(host="127.0.0.1",port=3306,user="root",passwd="123456",db="school",charset="utf8",autocommit=True)
# 关闭游标
cursor.close()
# 关闭连接
conn.close()
自己封装helper类
import pymysql
class dbhelper():
def __init__(self,host,port,user,passwd,db,charset="utf8"):
self.host=host
self.port=port
self.user=user
self.passwd=passwd
self.db=db
self.charset=charset
#创建一个链接
def connection(self):
#1. 创建连接
self.conn = pymysql.connect(host=self.host, port=self.port, user=self.user, passwd=self.passwd, db=self.db,charset=self.charset)
#2. 创建游标
self.cur = self.conn.cursor()
#关闭链接
def closeconnection(self):
self.cur.close()
self.conn.close()
#查询一条数据
def getonedata(self,sql):
try:
self.connection()
self.cur.execute(sql)
result=self.cur.fetchone()
self.closeconnection()
except Exception:
print(Exception)
return result
#查询多条数据
def getalldata(self,sql):
try:
self.connection()
self.cur.execute(sql)
result=self.cur.fetchall()
self.closeconnection()
except Exception:
print(Exception)
return result
#添加/修改/删除
def executedata(self,sql):
try:
self.connection()
self.cur.execute(sql)
self.conn.commit()
self.closeconnection()
except Exception:
print(Exception)
封装好了以后，后续用到mysql的操作的地方都可以直接使用，栗子如下：
from mysqlhelper import *
db=dbhelper(host='127.0.0.1', port=3306, user='root', passwd='123456', db='school',charset="utf8")
result=db.getalldata("select * from class")
print(result)