封装

• 观察前面的文件发现，除了SQL语句及参数不同，其它语句都是一样的
• 创建MysqlHelper.py文件，定义类

#encoding=utf8

import MySQLdb

class MysqlHelper():

    def __init__(self,host,port,db,user,passwd,charset='utf8'):

        self.host=host

        self.port=port

        self.db=db

        self.user=user

        self.passwd=passwd

        self.charset=charset

    def connect(self):

        self.conn=MySQLdb.connect(host=self.host,port=self.port,db=self.db,user=self.user,passwd=self.passwd,charset=self.charset)

        self.cursor=self.conn.cursor()

    def close(self):

        self.cursor.close()

        self.conn.close()

    def get_one(self,sql,params=()):

        result=None

        try:

            self.connect()

            self.cursor.execute(sql, params)

            result = self.cursor.fetchone()

            self.close()

        except Exception, e:

            print e.message

        return result

    def get_all(self,sql,params=()):

        list=()

        try:

            self.connect()

            self.cursor.execute(sql,params)

            list=self.cursor.fetchall()

            self.close()

        except Exception,e:

            print e.message

        return list

    def insert(self,sql,params=()):

        return self.__edit(sql,params)

    def update(self, sql, params=()):

        return self.__edit(sql, params)

    def delete(self, sql, params=()):

        return self.__edit(sql, params)

    def __edit(self,sql,params):

        count=0

        try:

            self.connect()

            count=self.cursor.execute(sql,params)

            self.conn.commit()

            self.close()

        except Exception,e:

            print e.message

        return count

添加

• 创建testInsertWrap.py文件，使用封装好的帮助类完成插入操作

#encoding=utf8

from MysqlHelper import *

sql='insert into students(sname,gender) values(%s,%s)'

sname=raw_input("请输入用户名：")

gender=raw_input("请输入性别，1为男，0为女")

params=[sname,bool(gender)]

mysqlHelper=MysqlHelper('localhost',3306,'test1','root','mysql')

count=mysqlHelper.insert(sql,params)

if count==1:

    print 'ok'

else:

    print 'error'

查询一个

• 创建testGetOneWrap.py文件，使用封装好的帮助类完成查询最新一行数据操作

#encoding=utf8

from MysqlHelper import *

sql='select sname,gender from students order by id desc'

helper=MysqlHelper('localhost',3306,'test1','root','mysql')

one=helper.get_one(sql)

print one