pymysql的简单操作

一、安装

    pip3 install pymysql

二、使用操作

1、执行SQL

import pymysql
  
# 创建连接
conn = pymysql.connect(host='127.0.0.1', port=3306, user='root', passwd='1234', db='tkq1', charset='utf8')
# 创建游标
cursor = conn.cursor()
  
# 执行SQL,并返回收影响行数
effect_row = cursor.execute("select * from tb7")
  
# 执行SQL,并返回受影响行数
#effect_row = cursor.execute("update tb7 set pass = '1234' where nid = %s", (11,))
  
# 执行SQL,并返回受影响行数,执行多次
#effect_row = cursor.executemany("insert into tb7(user,pass,licnese)values(%s,%s,%s)", [("u1","u1pass","11111"),("u2","u2pass","22222")])
  
  
# 提交,不然无法保存新建或者修改的数据
conn.commit()
  
# 关闭游标
cursor.close()
# 关闭连接
conn.close()

注意:存在中文的时候,连接需要添加charset='utf8',否则中文显示乱码。

2、获取查询数据

import pymysql
 
conn = pymysql.connect(host='127.0.0.1', port=3306, user='root', passwd='1234', db='tkq1')
cursor = conn.cursor()
cursor.execute("select * from tb7")
 
# 获取剩余结果的第一行数据
row_1 = cursor.fetchone()
print(row_1)
# 获取剩余结果前n行数据
# row_2 = cursor.fetchmany(3)
 
# 获取剩余结果所有数据
# row_3 = cursor.fetchall()
 
conn.commit()
cursor.close()
conn.close()

  

3、获取新创建数据自增ID

可以获取到最新自增的ID,也就是最后插入的一条数据ID

import pymysql
conn = pymysql.connect(host='127.0.0.1', port=3306, user='root', passwd='1234', db='tkq1')
cursor = conn.cursor()
effect_row = cursor.executemany("insert into tb7(user,pass,licnese)values(%s,%s,%s)", [("u3","u3pass","11113"),("u4","u4pass","22224")])
conn.commit()
cursor.close()
conn.close()
#获取自增id
new_id = cursor.lastrowid     
print(new_id)

  

4、移动游标

操作都是靠游标,那对游标的控制也是必须的

注:在fetch数据时按照顺序进行,可以使用cursor.scroll(num,mode)来移动游标位置,如:
 
cursor.scroll(1,mode='relative') # 相对当前位置移动
cursor.scroll(2,mode='absolute') # 相对绝对位置移动

  

5、fetch数据类型

关于默认获取的数据是元祖类型,如果想要或者字典类型的数据,即:

import pymysql
conn = pymysql.connect(host='127.0.0.1', port=3306, user='root', passwd=1234'', db='tkq1')
#游标设置为字典类型
cursor = conn.cursor(cursor=pymysql.cursors.DictCursor)
cursor.execute("select * from tb7")
 
row_1 = cursor.fetchone()
print(row_1)  #{u'licnese': 213, u'user': '123', u'nid': 10, u'pass': '213'}
 
conn.commit()
cursor.close()
conn.close()

 

6、调用存储过程

a、调用无参存储过程

import pymysql
conn = pymysql.connect(host='127.0.0.1', port=3306, user='root', passwd='1234', db='tkq1')
#游标设置为字典类型
cursor = conn.cursor(cursor=pymysql.cursors.DictCursor)
#无参数存储过程
cursor.callproc('p2')  #等价于cursor.execute("call p2()")
 
row_1 = cursor.fetchone()
print(row_1)
 
conn.commit()
cursor.close()
conn.close()

  

b、调用有参存储过程

import pymysql

conn = pymysql.connect(host='127.0.0.1', port=3306, user='root', passwd=1234'', db='tkq1')
cursor = conn.cursor(cursor=pymysql.cursors.DictCursor)
 
cursor.callproc('p1', args=(1, 22, 3, 4))
#获取执行完存储的参数,参数@开头
cursor.execute("select @p1,@_p1_1,@_p1_2,@_p1_3")  #{u'@_p1_1': 22, u'@p1': None, u'@_p1_2': 103, u'@_p1_3': 24}
row_1 = cursor.fetchone()
print(row_1)
 
 
conn.commit()
cursor.close()
conn.close()

 

三、关于pymysql防注入

 1、字符串拼接查询,造成注入

正常查询语句

import pymysql
conn = pymysql.connect(host='127.0.0.1', port=3306, user='root', passwd='1234', db='tkq1')
cursor = conn.cursor()
user="u1"
passwd="u1pass"
#正常构造语句的情况
sql="select user,pass from tb7 where user='%s' and pass='%s'" % (user,passwd)
#sql=select user,pass from tb7 where user='u1' and pass='u1pass'
row_count=cursor.execute(sql) row_1 = cursor.fetchone()
print(row_count,row_1)
 
conn.commit()
cursor.close()
conn.close()

  

构造注入语句:

import pymysql
 
conn = pymysql.connect(host='127.0.0.1', port=3306, user='root', passwd='1234', db='tkq1')
cursor = conn.cursor()
 
user="u1' or '1'-- "
passwd="u1pass"
sql="select user,pass from tb7 where user='%s' and pass='%s'" % (user,passwd)
 
#拼接语句被构造成下面这样,永真条件,此时就注入成功了。因此要避免这种情况需使用pymysql提供的参数化查询。
#select user,pass from tb7 where user='u1' or '1'-- ' and pass='u1pass'
 
row_count=cursor.execute(sql)
row_1 = cursor.fetchone()
print(row_count,row_1)
 
 
conn.commit()
cursor.close()
conn.close()

  

2、避免注入,使用pymysql提供的参数化语句

正常参数化查询

#! /usr/bin/env python
# -*- coding:utf-8 -*-
# __author__ = "TKQ"
 
import pymysql
 
conn = pymysql.connect(host='127.0.0.1', port=3306, user='root', passwd='', db='tkq1')
cursor = conn.cursor()
user="u1"
passwd="u1pass"
#执行参数化查询
row_count=cursor.execute("select user,pass from tb7 where user=%s and pass=%s",(user,passwd))
row_1 = cursor.fetchone()
print row_count,row_1
 
conn.commit()
cursor.close()
conn.close()

 

 2、避免注入,使用pymysql提供的参数化语句

正常参数化查

import pymysql
 
conn = pymysql.connect(host='127.0.0.1', port=3306, user='root', passwd='', db='tkq1')
cursor = conn.cursor()
user="u1"
passwd="u1pass"
#执行参数化查询
row_count=cursor.execute("select user,pass from tb7 where user=%s and pass=%s",(user,passwd))
row_1 = cursor.fetchone()
print(row_count,row_1)
 
conn.commit()
cursor.close()
conn.close()

 

 

 
# 执行sql
with mysql() as cursor:
  print(cursor)
  row_count = cursor.execute("select * from tb7")
  row_1 = cursor.fetchone()
  print row_count, row_1

--------------------- 本文来自 nszkadrgg 的CSDN 博客 ,全文地址请点击:https://blog.csdn.net/nszkadrgg/article/details/80138796?utm_source=copy 

posted @ 2018-10-08 14:58  笃行1995  阅读(192)  评论(0编辑  收藏  举报