Python操作MySQL

 

Python操作Mysql 模块的安装  yum install MySQL-python

Python操作MySQL

Python操作MySQL
SQL基本使用
1、数据库操作

show databases;
use [databasename];
create database  [name];

2、数据表操作
show tables;
 
create table students
    (
        id int  not null auto_increment primary key,
        name char(8) not null,
        sex char(4) not null,
        age tinyint unsigned not null,
        tel char(13) null default "-"
    );


###
CREATE TABLE `wb_blog` ( 
    `id` smallint(8) unsigned NOT NULL, 
    `catid` smallint(5) unsigned NOT NULL DEFAULT '0', 
    `title` varchar(80) NOT NULL DEFAULT '', 
    `content` text NOT NULL, 
    PRIMARY KEY (`id`), 
    UNIQUE KEY `catename` (`catid`) 
) ; 


3、数据操作（增删改查）

insert into students(name,sex,age,tel) values('fly','man',18,'151515151')
 
delete from students where id =2;
 
update students set name = 'flying' where id =1;
 
select * from students；

 

Python MySQL API

执行sql

#!/usr/bin/env python
# -*- coding:utf-8 -*-
import pymysql
  
# 创建连接
conn = pymysql.connect(host='127.0.0.1', port=3306, user='root', passwd='123', db='t1')
# 创建游标
cursor = conn.cursor()
  
# 执行SQL，并返回收影响行数
effect_row = cursor.execute("update hosts set host = '1.1.1.2'")
  
# 执行SQL，并返回受影响行数
#effect_row = cursor.execute("update hosts set host = '1.1.1.2' where nid > %s", (1,))
  
# 执行SQL，并返回受影响行数
#effect_row = cursor.executemany("insert into hosts(host,color_id)values(%s,%s)", [("1.1.1.11",1),("1.1.1.11",2)])
  
  
# 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()

 

1、插入数据

import MySQLdb
  
conn = MySQLdb.connect(host='127.0.0.1',user='root',passwd='1234',db='mydb')
  
cur = conn.cursor()
  
reCount = cur.execute('insert into UserInfo(Name,Address) values(%s,%s)',('flying','usa'))
# reCount = cur.execute('insert into UserInfo(Name,Address) values(%(id)s, %(name)s)',{'id':12345,'name':'flyoss'})
  
conn.commit()
  
cur.close()
conn.close()
  
print reCount

import MySQLdb

conn = MySQLdb.connect(host='127.0.0.1',user='root',passwd='1234',db='mydb')

cur = conn.cursor()

info =[
     ('fly','usa'), 
     ('flying','usa'),
]
reCount = cur.executemany('insert into UserInfo(Name,Address) values(%s,%s)',info)

conn.commit()
cur.close()
conn.close()

print reCount

批量插入数据    

 

2、删除数据

import MySQLdb
 
conn = MySQLdb.connect(host='127.0.0.1',user='root',passwd='1234',db='mydb')
 
cur = conn.cursor()
 
reCount = cur.execute('delete from UserInfo')
 
conn.commit()
 
cur.close()
conn.close()
 
print reCount

3、修改数据

import MySQLdb
 
conn = MySQLdb.connect(host='127.0.0.1',user='root',passwd='1234',db='mydb')
 
cur = conn.cursor()
 
reCount = cur.execute('update UserInfo set Name = %s',('alin',))
 
conn.commit()
cur.close()
conn.close()
 
print reCount

4.查数据

# ############################## fetchone/fetchmany(num)  ##############################
 
import MySQLdb
 
conn = MySQLdb.connect(host='127.0.0.1',user='root',passwd='1234',db='mydb')
cur = conn.cursor()
 
reCount = cur.execute('select * from UserInfo')
 
print cur.fetchone()
print cur.fetchone()
cur.scroll(-1,mode='relative')
print cur.fetchone()
print cur.fetchone()
cur.scroll(0,mode='absolute')
print cur.fetchone()
print cur.fetchone()
 
cur.close()
conn.close()
 
print reCount
 
 
 
# ############################## fetchall  ##############################
 
import MySQLdb
 
conn = MySQLdb.connect(host='127.0.0.1',user='root',passwd='1234',db='mydb')
#cur = conn.cursor(cursorclass = MySQLdb.cursors.DictCursor)
cur = conn.cursor()
 
reCount = cur.execute('select Name,Address from UserInfo')
 
nRet = cur.fetchall()
 
cur.close()
conn.close()
 
print reCount
print nRet
for i in nRet:
    print i[0],i[1]