Google應用引擎+ python（django）部署錯誤：加載MySQLdb模塊時出錯

Question

我正在Google App Engine上創建一個應用。我正在使用Django 1.4和Python 2.7。一切工作正常localhost。但部署後它沒有運行，我一直在管理日誌上得到這個：

2012-12-15 15:02:41.870 

    /base/python27_runtime/python27_lib/versions/1/lib/cacerts/urlfetch_cacerts.txt missing; without this urlfetch will not be able to validate SSL certificates. 

    W 2012-12-15 15:02:41.870 

    No ssl package found. urlfetch will not be able to validate SSL certificates. 

    E 2012-12-15 15:02:46.086 

    Traceback (most recent call last): 
     File "/base/python27_runtime/python27_lib/versions/1/google/appengine/runtime/wsgi.py", line 196, in Handle 
     handler = _config_handle.add_wsgi_middleware(self._LoadHandler()) 
     File "/base/python27_runtime/python27_lib/versions/1/google/appengine/runtime/wsgi.py", line 266, in _LoadHandler 
     __import__(cumulative_path) 
     File "/base/data/home/apps/s~cloudwallforever/1.363864476397206865/djangoappengine/main/__init__.py", line 28, in <module> 
     setup_env() 
     File "/base/data/home/apps/s~cloudwallforever/1.363864476397206865/djangoappengine/boot.py", line 82, in setup_env 
     setup_logging() 
     File "/base/data/home/apps/s~cloudwallforever/1.363864476397206865/djangoappengine/boot.py", line 130, in setup_logging 
     if not settings.DEBUG: 
     File "/base/data/home/apps/s~cloudwallforever/1.363864476397206865/django/utils/functional.py", line 276, in __getattr__ 
     self._setup() 
     File "/base/data/home/apps/s~cloudwallforever/1.363864476397206865/django/conf/__init__.py", line 42, in _setup 
     self._wrapped = Settings(settings_module) 
     File "/base/data/home/apps/s~cloudwallforever/1.363864476397206865/django/conf/__init__.py", line 87, in __init__ 
     mod = importlib.import_module(self.SETTINGS_MODULE) 
     File "/base/data/home/apps/s~cloudwallforever/1.363864476397206865/django/utils/importlib.py", line 35, in import_module 
     __import__(name) 
     File "/base/data/home/apps/s~cloudwallforever/1.363864476397206865/settings.py", line 6, in <module> 
     import django.db.backends.mysql.base 
     File "/base/data/home/apps/s~cloudwallforever/1.363864476397206865/django/db/backends/mysql/base.py", line 14, in <module> 
     raise ImproperlyConfigured("Error loading MySQLdb module: %s" % e) 
    ImproperlyConfigured: Error loading MySQLdb module: No module named MySQLdb 

任何想法，爲什麼發生？

Answer 1

由於Cloud SQL docs明確指出，您應該使用''google.appengine.ext.django.backends.rdbms'作爲您的數據庫引擎設置。

Answer 2

的「Django的支持」的文件暗示瞭解決方案，但不會使其明確：

Since the standard django.db.backends.mysql backend uses MySQLdb internally, app.yaml must reference MySQLdb in the list of libraries.

加入以下app.yaml似乎解決了導入錯誤：

libraries: 
- name: MySQLdb 
    version: "latest" 

注意MySQLdb目前不包含在available third party libraries的列表中。我嘗試了一下，它似乎已經解決了我的問題，YMMV。 enter link description here

Answer 3

如果它不添加以下至app.yaml後的工作：

libraries: 
- name: MySQLdb 
    version: "latest" 

...然後採取以下步驟：

1. 確保MySQLdb的安裝pip install mysql-python在Mac
2. 確保GAE devserver指向您的virtualenv/pip'd python 2.7安裝與Mac/* nix的默認版本，因爲pip可能沒有安裝它。我通過更新GAE devserver來解決Can't find module: MySQLdb：/usr/local/bin/python2.7在GAE devserver preferences for Python Path

注：偏好可以通過應用程序菜單訪問：

• 如果你使用的是Windows：File > Preferences...
• 下看，如果你使用的是Mac，看看GoogleAppengineLauncher > Preferences...
下