我正在運行一個基于

python flask的web服務,我想在那里執行一個小的

MySQL Query.當我獲得SQL查詢的有效輸入時,一切都按預期工作,我得到了正確的值.但是,如果該值未存儲在數據庫中,則會收到TypeError

Traceback (most recent call last):

File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1836, in __call__

return self.wsgi_app(environ, start_response)

File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1820, in wsgi_app

response = self.make_response(self.handle_exception(e))

File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1403, in handle_exception

reraise(exc_type, exc_value, tb)

File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1817, in wsgi_app

response = self.full_dispatch_request()

File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1478, in full_dispatch_request

response = self.make_response(rv)

File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1566, in make_response

raise ValueError('View function did not return a response')

ValueError: View function did not return a response

我試圖自己處理錯誤處理并將此代碼用于我的項目,但似乎這不能正常工作.

#!/usr/bin/python

from flask import Flask, request

import MySQLdb

import json

app = Flask(__name__)

@app.route("/get_user", methods=["POST"])

def get_user():

data = json.loads(request.data)

email = data["email"]

sql = "SELECT userid FROM oc_preferences WHERE configkey='email' AND configvalue LIKE '" + email + "%';";

conn = MySQLdb.connect( host="localhost",

user="root",

passwd="ubuntu",

db="owncloud",

port=3306)

curs = conn.cursor()

try:

curs.execute(sql)

user = curs.fetchone()[0]

return user

except MySQLdb.Error, e:

try:

print "MySQL Error [%d]: %s" % (e.args[0], e.args[1])

return None

except IndexError:

print "MySQL Error: %s" % str(e)

return None

except TypeError, e:

print(e)

return None

except ValueError, e:

print(e)

return None

finally:

curs.close()

conn.close()

if __name__ == "__main__":

app.run(host="0.0.0.0", port=5000, debug=True)

基本上我只想返回一個值,當一切正常工作時我想要什么都不返回,如果它不是最好在我的服務器上有錯誤消息.如何以正確的方式使用錯誤處理？

編輯更新了當前代碼錯誤消息.

總結

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