ImportError：谷歌应用引擎中没有名为****的模块错误

Question

I am developing my application in google app engine now i am using Google Cloud SQL. It runs at localhost perfectly,, But when i am deploying my application to server it gives me following error.

ImportError: No module named MySQLdb

Later i have copied MySQLdb package to application directory. Now it is giving me error

ImportError: No module named _mysql.

What i am doing wrong here , Any guideline ?

Answer 1

MySQLdb might be missing in your app.yaml. This library should be there so that Google App Engine loads it for your instance. Hope this will help.

libraries:
- name: MySQLdb
  version: "latest"

Answer 2

Looking at the docs that does not seem to be how you do it at all.

Building an application with a local MySQL instance

from google.appengine.api import rdbms

CLOUDSQL_INSTANCE = ''
DATABASE_NAME = 'guestbook'
USER_NAME = 'username'
PASSWORD = 'password'


def get_connection():
    return rdbms.connect(instance=CLOUDSQL_INSTANCE, database=DATABASE_NAME,
                         user=USER_NAME, password=PASSWORD, charset='utf8')

Answer 3

This tutorial got my app eventually working...

What I did: I created a very basic project (just one simple app with one model) and followed above tutorial to get it working in my development environment and on GAE. Then migrated my code from my old (non-GAE) project to the new project. All was fine.

The bad news: it still takes some effort getting a new project properly deployed on GAE and Cloud SQL. I have never managed to get it working in one go. You have to really scrutinise the GAE logs.