python manage.py syncdb 无法正常工作答案

【问题标题】：python manage.py syncdb not working correctlypython manage.py syncdb 无法正常工作
【发布时间】：2012-09-22 22:57:09
【问题描述】：

我玩过 Django、python 和 MySQL；并在 import django 时安装并使其工作，通过 python 命令行导入 MySQLdb。

但是当我尝试在项目的根目录执行python manage.py syncdb时，我得到了以下错误消息：

Traceback (most recent call last):
  File "manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/django/core/management/__init__.py", line 443, in execute_from_command_line
    utility.execute()
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/django/core/management/__init__.py", line 382, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/django/core/management/base.py", line 196, in run_from_argv
    self.execute(*args, **options.__dict__)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/django/core/management/base.py", line 231, in execute
    self.validate()
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/django/core/management/base.py", line 266, in validate
    num_errors = get_validation_errors(s, app)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/django/core/management/validation.py", line 103, in get_validation_errors
    connection.validation.validate_field(e, opts, f)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/django/db/backends/mysql/validation.py", line 14, in validate_field
    db_version = self.connection.get_server_version()
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/django/db/backends/mysql/base.py", line 415, in get_server_version
    self.cursor().close()
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/django/db/backends/__init__.py", line 306, in cursor
    cursor = self.make_debug_cursor(self._cursor())
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/django/db/backends/mysql/base.py", line 387, in _cursor
    self.connection = Database.connect(**kwargs)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/MySQLdb/__init__.py", line 81, in Connect
    return Connection(*args, **kwargs)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/MySQLdb/connections.py", line 187, in __init__
    super(Connection, self).__init__(*args, **kwargs2)
_mysql_exceptions.OperationalError: (2002, "Can't connect to local MySQL server through socket '/opt/local/var/run/mysql5/mysqld.sock' (13)")

可能的问题是什么？好像是连接错误的东西？我是新手，感谢您的帮助:)

我附上了我的 settings.py 文件：

  # Django settings for mysite project.
   DEBUG = True
   TEMPLATE_DEBUG = DEBUG

ADMINS = (
    # ('Your Name', 'your_email@example.com'),
)

MANAGERS = ADMINS

DATABASES = {
     'default': {
        'ENGINE': 'django.db.backends.mysql', 
        'NAME': '',                      
        'USER': 'localhost',                 
        'PASSWORD': '',                 
        'HOST': '',                     
        'PORT': '',                     
    }
}

  TIME_ZONE = 'America/Chicago'

  LANGUAGE_CODE = 'en-us'

  SITE_ID = 1

  USE_I18N = True

  USE_L10N = True

  USE_TZ = True

  MEDIA_ROOT = ''

  MEDIA_URL = ''

  STATIC_ROOT = ''

  STATIC_URL = '/static/'

  STATICFILES_DIRS = (
  )

  STATICFILES_FINDERS = (
    'django.contrib.staticfiles.finders.FileSystemFinder',
    'django.contrib.staticfiles.finders.AppDirectoriesFinder',
  )


SECRET_KEY = 'wke73b4pm&amp;s-g(ra*to+ykxe*3@0h=nrnt(v&amp;3kf)fx=co*72@'

TEMPLATE_LOADERS = (
    'django.template.loaders.filesystem.Loader',
    'django.template.loaders.app_directories.Loader',
)

MIDDLEWARE_CLASSES = (
    'django.middleware.common.CommonMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
)

ROOT_URLCONF = 'mysite.urls'

WSGI_APPLICATION = 'mysite.wsgi.application'

TEMPLATE_DIRS = (
)

INSTALLED_APPS = (
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.sites',
    'django.contrib.messages',
    'django.contrib.staticfiles',
)


LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'filters': {
        'require_debug_false': {
            '()': 'django.utils.log.RequireDebugFalse'
        }
    },
    'handlers': {
        'mail_admins': {
            'level': 'ERROR',
            'filters': ['require_debug_false'],
            'class': 'django.utils.log.AdminEmailHandler'
        }
    },
    'loggers': {
        'django.request': {
            'handlers': ['mail_admins'],
            'level': 'ERROR',
            'propagate': True,
        },
    }
}

我可以使用命令行成功登录mysql数据库： mysql -u 本地主机

在设置 HOST = "127.0.0.1" 后，我收到一条更新的错误消息：

Traceback (most recent call last):
  File "manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/django/core/management/__init__.py", line 443, in execute_from_command_line
    utility.execute()
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/django/core/management/__init__.py", line 382, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/django/core/management/base.py", line 196, in run_from_argv
    self.execute(*args, **options.__dict__)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/django/core/management/base.py", line 232, in execute
    output = self.handle(*args, **options)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/django/core/management/base.py", line 371, in handle
    return self.handle_noargs(**options)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/django/core/management/commands/syncdb.py", line 60, in handle_noargs
    tables = connection.introspection.table_names()
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/django/db/backends/__init__.py", line 896, in table_names
    return self.get_table_list(cursor)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/django/db/backends/mysql/introspection.py", line 33, in get_table_list
    cursor.execute("SHOW TABLES")
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/django/db/backends/util.py", line 40, in execute
    return self.cursor.execute(sql, params)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/django/db/backends/mysql/base.py", line 114, in execute
    return self.cursor.execute(query, args)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/MySQLdb/cursors.py", line 174, in execute
    self.errorhandler(self, exc, value)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/MySQLdb/connections.py", line 36, in defaulterrorhandler
    raise errorclass, errorvalue
django.db.utils.DatabaseError: (1046, 'No database selected')

【问题讨论】：

它无法连接到您的数据库。请检查最后一行
您正在尝试连接到您引用为“localhost”的 mysql 数据库，而这不是您的 mysql 服务器
更新问题并添加您的settings.py 文件
执行此操作 - 在 shell 中执行 mysql -u <username> -p -h<host> <appname>。看看你能不能进去。如果不能，你访问数据库服务器或数据库实例的凭据有问题
嗨 Karthikr，我可以使用 mysql -u localhost

标签： python mysql django mysql-python

【解决方案1】：

您在数据库设置中缺少HOST。使用localhost 或127.0.0.1。

显然，当未指定主机时，mysqldb 默认使用 unix 域套接字，而不是使用常规主机名/端口。

【讨论】：

嗨 Plaes，HOST 的空 '' 表示它是本地主机。我补充说，即使是为了尝试目的，但仍然无法正常工作。还是谢谢。
@leoooo 当错误信息显示：Can't connect to local MySQL server through socket '/opt/local/var/run/mysql5/mysqld.sock' (13)") 时，HOST 的值一定有问题。
我将 HOST 的空字符串替换为“127.0.0.1”，并得到了我在原始帖子中编辑的上述错误...

【解决方案2】：

您需要先在 MySQL 中创建一个模式（我们将其命名为 my_db_schema），然后在 NAME 下指定它的名称。

DATABASES = {
     'default': {
        'ENGINE': 'django.db.backends.mysql', 
        'NAME': 'my_db_schema',                      
        'USER': 'localhost',                 
        'PASSWORD': '',                 
        'HOST': '',                     
        'PORT': '',                     
    }
}

【讨论】：

【解决方案3】：

我遇到了完全相同的问题。 settings.py 中的 DATABASES 需要同时设置 HOSTNAME 和 PORT 的值。

在我的例子中，mysql 使用主机“localhost:3306”。当我将 PORT(in settings.py) 值设置为 3306 时，它可以工作。

【讨论】：

【解决方案4】：

只需添加数据库名称和端口号..

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.mysql', 
        'NAME': 'Database_name',                 
        'USER': 'root',                    
        'PASSWORD': 'root',                
        'HOST': '',                     
        'PORT': '3306',                  
    }
}

【讨论】：