准备开始python的环境，用django框架其默认的数据库是sqlite3 ，要改用MySQL来存储数据

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在执行migrate的时候出现问题（错误见末尾）：

Unhandled exception in thread started by .wrapper

 at 0x031BD6F0>

Traceback (most recent call last):

  File "C:\Python36\lib\site-packages\django\db\backends\base\base.py", line 213

, in ensure_connection

    self.connect()

  File "C:\Python36\lib\site-packages\django\db\backends\base\base.py", line 189

, in connect

    self.connection = self.get_new_connection(conn_params)

  File "C:\Python36\lib\site-packages\django\db\backends\mysql\base.py", line 27

4, in get_new_connection

    conn = Database.connect(**conn_params)

  File "C:\Python36\lib\site-packages\MySQLdb\__init__.py", line 86, in Connect

    return Connection(*args, **kwargs)

  File "C:\Python36\lib\site-packages\MySQLdb\connections.py", line 204, in __in

it__

    super(Connection, self).__init__(*args, **kwargs2)

_mysql_exceptions.OperationalError: (1045, "Access denied for user 'ODBC'@'local

host' (using password: YES)")

The above exception was the direct cause of the following exception:

Traceback (most recent call last):

  File "C:\Python36\lib\site-packages\django\utils\autoreload.py", line 227, in

wrapper

    fn(*args, **kwargs)

  File "C:\Python36\lib\site-packages\django\core\management\commands\runserver.

py", line 125, in inner_run

    self.check(display_num_errors=True)

  File "C:\Python36\lib\site-packages\django\core\management\base.py", line 359,

 in check

    include_deployment_checks=include_deployment_checks,

  File "C:\Python36\lib\site-packages\django\core\management\base.py", line 346,

 in _run_checks

    return checks.run_checks(**kwargs)

  File "C:\Python36\lib\site-packages\django\core\checks\registry.py", line 81,

in run_checks

    new_errors = check(app_configs=app_configs)

  File "C:\Python36\lib\site-packages\django\core\checks\model_checks.py", line

30, in check_all_models

    errors.extend(model.check(**kwargs))

  File "C:\Python36\lib\site-packages\django\db\models\base.py", line 1282, in c

heck

    errors.extend(cls._check_fields(**kwargs))

  File "C:\Python36\lib\site-packages\django\db\models\base.py", line 1357, in _

check_fields

    errors.extend(field.check(**kwargs))

  File "C:\Python36\lib\site-packages\django\db\models\fields\__init__.py", line

 909, in check

    errors = super(AutoField, self).check(**kwargs)

  File "C:\Python36\lib\site-packages\django\db\models\fields\__init__.py", line

 219, in check

    errors.extend(self._check_backend_specific_checks(**kwargs))

  File "C:\Python36\lib\site-packages\django\db\models\fields\__init__.py", line

 322, in _check_backend_specific_checks

    return connections[db].validation.check_field(self, **kwargs)

  File "C:\Python36\lib\site-packages\django\db\backends\mysql\validation.py", l

ine 49, in check_field

    field_type = field.db_type(self.connection)

  File "C:\Python36\lib\site-packages\django\db\models\fields\__init__.py", line

 640, in db_type

    return connection.data_types[self.get_internal_type()] % data

  File "C:\Python36\lib\site-packages\django\utils\functional.py", line 35, in _

_get__

    res = instance.__dict__[self.name] = self.func(instance)

  File "C:\Python36\lib\site-packages\django\db\backends\mysql\base.py", line 17

4, in data_types

    if self.features.supports_microsecond_precision:

  File "C:\Python36\lib\site-packages\django\utils\functional.py", line 35, in _

_get__

    res = instance.__dict__[self.name] = self.func(instance)

  File "C:\Python36\lib\site-packages\django\db\backends\mysql\features.py", lin

e 53, in supports_microsecond_precision

    return self.connection.mysql_version >= (5, 6, 4) and Database.version_info

>= (1, 2, 5)

  File "C:\Python36\lib\site-packages\django\utils\functional.py", line 35, in _

_get__

    res = instance.__dict__[self.name] = self.func(instance)

  File "C:\Python36\lib\site-packages\django\db\backends\mysql\base.py", line 38

5, in mysql_version

    with self.temporary_connection() as cursor:

  File "C:\Python36\lib\contextlib.py", line 82, in __enter__

    return next(self.gen)

  File "C:\Python36\lib\site-packages\django\db\backends\base\base.py", line 591

, in temporary_connection

    cursor = self.cursor()

  File "C:\Python36\lib\site-packages\django\db\backends\base\base.py", line 254

, in cursor

    return self._cursor()

  File "C:\Python36\lib\site-packages\django\db\backends\base\base.py", line 229

, in _cursor

    self.ensure_connection()

  File "C:\Python36\lib\site-packages\django\db\backends\base\base.py", line 213

, in ensure_connection

    self.connect()

  File "C:\Python36\lib\site-packages\django\db\utils.py", line 94, in __exit__

    six.reraise(dj_exc_type, dj_exc_value, traceback)

  File "C:\Python36\lib\site-packages\django\utils\six.py", line 685, in reraise

    raise value.with_traceback(tb)

  File "C:\Python36\lib\site-packages\django\db\backends\base\base.py", line 213

, in ensure_connection

    self.connect()

  File "C:\Python36\lib\site-packages\django\db\backends\base\base.py", line 189

, in connect

    self.connection = self.get_new_connection(conn_params)

  File "C:\Python36\lib\site-packages\django\db\backends\mysql\base.py", line 27

4, in get_new_connection

    conn = Database.connect(**conn_params)

  File "C:\Python36\lib\site-packages\MySQLdb\__init__.py", line 86, in Connect

    return Connection(*args, **kwargs)

  File "C:\Python36\lib\site-packages\MySQLdb\connections.py", line 204, in __in

it__

    super(Connection, self).__init__(*args, **kwargs2)

django.db.utils.OperationalError: (1045, "Access denied for user 'ODBC'@'localho

st' (using password: YES)")

这里很奇怪为什么我配置的用户是 admin_py 怎么会显示 ‘ODBC’@‘localhost’？

有人说是账号密码错误，通过报错看来的和账号密码错误相关，但是手工去登陆mysql是OK的啊！

折腾了一会儿，仔细看官方文档配置：

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql',
        'NAME': 'mydatabase',
        'USER': 'mydatabaseuser',
        'PASSWORD': 'mypassword',
        'HOST': '127.0.0.1',
        'PORT': '5432',
    }}

我自己的配置：

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.mysql',
        'HOST': '127.0.0.1',
        'PORT': 3306,
        'NAME': 'platform_admin_py',
        'USERNAME': 'admin_py',
        'PASSWORD': 'admin',
    }
}

发现了没有？用户名的的那个KEY不对！ 我承认我这是从网上看别人的配置写的，偷懒了，这就是代价

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