已知有三個數據庫mysql,mongodb和redis，已經分別存儲了不同的學生信息，數據全部采用字符串類型，只有id和name兩個字段(在mongo和redis中鍵為id,值為name)，現需編寫代碼實現需求：根據指定id獲取對應的name和存儲該條信息的數據庫名稱。

答案結果如下：

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 = ["不在庫中", "未找到該學生"]

?

??? 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 = ["不在庫中", "未找到該學生"]

??? ????????????????return self.msg

def main():

??? stu_id =input("請輸入要查詢的id號：")

??? check_id =Check()

??? id_msg =check_id.check(stu_id)

???print(id_msg)

if __name__ == '__main__':

??? main()

總結

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