已知有三个数据库mysql,mongodb和redis，已经分别存储了不同的学生信息，数据全部采用字符串类型，只有id和name两个字段(在mongo和redis中键为id,值为name)，现需编写代码实现需求：根据指定id获取对应的name和存储该条信息的数据库名称。

答案结果如下：

from pymysql import *

from pymongo import *

from redis import *

 

 

class MySQL(object):

    def__init__(self):

       self.con = connect(host='localhost', port=3306,

                           database='stu_info',user='root',

                           password='mysql',charset='utf8')

       self.cur = self.con.cursor()

       self.flag = ["mysql", None]

 

    defclose(self):

       self.cur.close()

       self.con.close()

 

    defcheck(self, sid):

        try:

            cur = self.cur

           param = [sid]

           sel_sql = "select name from student where id = %s"

           cur.execute(sel_sql, param)

           res = cur.fetchone()

            ifres:

               self.flag[1] = res[0]

        exceptException:

           pass

       finally:

           self.close()

           return self.flag

 

class Mongo(object):

    def__init__(self):

       self.client = MongoClient(host='localhost', port=27017)

       self.db = self.client.stu_info

       self.col = self.db.student

       self.flag = ["mongo", None]

 

    defcheck(self, sid):

        try:

           res = self.col.find_one({"id": sid})

            ifres:

               self.flag[1] = res["name"]

        exceptException:

            pass

       finally:

            return self.flag

 

class Redis(object):

    def__init__(self):

       self.client = StrictRedis()

       self.flag = ["redis", None]

 

    defcheck(self, sid):

        try:

           res = self.client.get(sid)

            ifres:

               self.flag[1] = res.decode()

        exceptException:

           pass

       finally:

           return self.flag

 

class Check(object):

    def__init__(self):

       self.msg = ["不在库中", "未找到该学生"]

 

    defcheck(self, sid):

        redis= Redis()

       self.msg = redis.check(sid)

        ifself.msg[1]:

           return self.msg

        else:

           mongo = Mongo()

           self.msg = mongo.check(sid)

            ifself.msg[1]:

                return self.msg

           else:

               mysql = MySQL()

               self.msg = mysql.check(sid)

               if self.msg[1]:

                   return self.msg

               else:

                   self.msg = ["不在库中", "未找到该学生"]

                    return self.msg

def main():

    stu_id =input("请输入要查询的id号：")

    check_id =Check()

    id_msg =check_id.check(stu_id)

   print(id_msg)

if __name__ == '__main__':

    main()