Python基础（十六）-操作数据库pymysql模块，,一、pymysql模

Python基础（十六）-操作数据库pymysql模块，,一、pymysql模

一、pymysql模块安装

pip3 install pymysql

二、连接数据库

2.1、创建测试数据

mysql> create database AA;mysql> use AAmysql> create table test(id int primary key auto_increment,name varchar(25),passwd varchar(25));mysql> insert into test(name,passwd) values(‘AA‘,123),(‘BB‘,456),(‘CC‘,789);mysql> select * from test;+----+------+--------+| id | name | passwd |+----+------+--------+|  1 | AA   | 123    ||  2 | BB   | 456    ||  3 | CC   | 789    |+----+------+--------+3 rows in set (0.00 sec)

2.2、连接数据库

#!/usr/bin/env python# -*- coding: utf-8 -*- import pymysqluser=input("用户名：").strip()pwd=input("密码：").strip()#连接conn = pymysql.connect(host="10.0.0.12",port=3306,user="root",passwd="mysql",db="AA")#游标cursor=conn.cursor()  #执行完毕返回的结果集默认以元组显示# cursor=conn.cursor(cursor=pymysql.cursors.DictCursor) #以字典形式返回#执行sql语句# sql = ‘select * from AA.test where name="%s" and passwd="%s"‘ %(user,pwd)  #注意%s需要加引号# print(sql)# res=cursor.execute(sql)  #执行sql语句，返回sql查询成功的记录数目# print(res)#execute帮我们做字符串拼接，我们无需且一定不能再为%s加引号了,pymysql会自动为我们加上sql="select * from test where name=%s and passwd=%s"print(sql)res=cursor.execute(sql,[user,pwd])print(res)#关闭游标及连接cursor.close()conn.close()if res:    print("登录成功")else:    print("登录失败")

三、增删改,conn.commit()

#!/usr/bin/env python# -*- coding: utf-8 -*- import pymysql#连接conn = pymysql.connect(host="10.0.0.12",port=3306,user="root",passwd="mysql",db="AA")#游标cursor=conn.cursor()  #执行完毕返回的结果集默认以元组显示# cursor=conn.cursor(cursor=pymysql.cursors.DictCursor) #以字典形式返回#执行sql语句#part1# sql="insert into test(name,passwd) values(‘DD‘,123456);"# print(sql)# res=cursor.execute(sql)# print(res)#part2# sql=‘insert into test(name,passwd) values(%s,%s);‘# res=cursor.execute(sql,("root","123456"))# print(res)#part3 插多行数据sql=‘insert into test(name,passwd) VALUES (%s,%s);‘res=cursor.executemany(sql,[("EE","123456"),("FF","123456"),("GG","123456"),])print(res)#关闭游标及连接conn.commit()  #提交后才发现表中插入记录成功cursor.close()conn.close()

四、查找

#!/usr/bin/env python# -*- coding: utf-8 -*-import pymysql#连接conn = pymysql.connect(host="10.0.0.12",port=3306,user="root",passwd="mysql",db="AA")#游标cursor=conn.cursor()  #执行完毕返回的结果集默认以元组显示# cursor=conn.cursor(cursor=pymysql.cursors.DictCursor) #以字典形式返回#查找sql=‘select * from test;‘rows=cursor.execute(sql)print(rows)  #8# cursor.scroll(3,mode="absolute")  # 相对绝对位置移动# cursor.scroll(3,mode="relative")  # 相对当前位置移动res1=cursor.fetchone()res2=cursor.fetchone()res3=cursor.fetchone()res4=cursor.fetchmany(2)res5=cursor.fetchall()print(res1)print(res2)print(res3)print(res4)print(res5)print(‘%s rows in set (0.00 sec)‘ %rows)#关闭游标及连接conn.commit()  #提交后才发现表中插入记录成功cursor.close()conn.close()‘‘‘(1, ‘AA‘, ‘123‘)(2, ‘BB‘, ‘456‘)(3, ‘CC‘, ‘789‘)((4, ‘DD‘, ‘123456‘), (5, ‘root‘, ‘123456‘))((6, ‘EE‘, ‘123456‘), (7, ‘FF‘, ‘123456‘), (8, ‘GG‘, ‘123456‘))8 rows in set (0.00 sec)‘‘‘

Python基础（十六）-操作数据库pymysql模块