如何解决我在 mysql 中的连接错误

Question

我试图连接我的数据库。 检查 settings.py 中的所有 db 设置，它们是正确的。 当我运行服务器时，我遇到了如下所示的错误。 我在互联网上搜索并找到了解决方案，但所有这些都适用于较低的 python 版本。 我正在使用最新的 python 版本。 我的错误是：

System check identified no issues (0 silenced).
Exception in thread django-main-thread:
Traceback (most recent call last):
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/threading.py", line 917, in _bootstrap_inner
self.run()
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/threading.py", line 865, in run
self._target(*self._args, **self._kwargs)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/django/utils/autoreload.py", line 54, in wrapper
fn(*args, **kwargs)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/django/core/management/commands/runserver.py", line 120, in inner_run
self.check_migrations()
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/django/core/management/base.py", line 453, in check_migrations
executor = MigrationExecutor(connections[DEFAULT_DB_ALIAS])
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/django/db/migrations/executor.py", line 18, in __init__
self.loader = MigrationLoader(self.connection)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/django/db/migrations/loader.py", line 49, in __init__
self.build_graph()
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/django/db/migrations/loader.py", line 212, in build_graph
self.applied_migrations = recorder.applied_migrations()
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/django/db/migrations/recorder.py", line 73, in applied_migrations
if self.has_table():
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/django/db/migrations/recorder.py", line 56, in has_table
return self.Migration._meta.db_table in self.connection.introspection.table_names(self.connection.cursor())
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/django/db/backends/base/base.py", line 256, in cursor
return self._cursor()
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/django/db/backends/base/base.py", line 233, in _cursor
self.ensure_connection()
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/django/db/backends/base/base.py", line 217, in ensure_connection
self.connect()
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/django/db/backends/base/base.py", line 197, in connect
self.init_connection_state()
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/django/db/backends/mysql/base.py", line 231, in init_connection_state
if self.features.is_sql_auto_is_null_enabled:
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/django/utils/functional.py", line 80, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/django/db/backends/mysql/features.py", line 82, in is_sql_auto_is_null_enabled
cursor.execute('SELECT @@SQL_AUTO_IS_NULL')
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/django/db/backends/utils.py", line 103, in execute
sql = self.db.ops.last_executed_query(self.cursor, sql, params)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/django/db/backends/mysql/operations.py", line 146, in last_executed_query
query = query.decode(errors='replace')
AttributeError: 'str' object has no attribute 'decode'

Answer 1

这是关于以前版本的 django 的老问题。 它目前是3.1.2 ，导致问题的代码块已修复。

https://github.com/django/django/blob/master/django/db/backends/mysql/operations.py

如果您的 django 版本比 3.0.0 新，您可以尝试pip install -U django （好）

其他选择是在您的 virtualenv 中的相关行更改您的 django 版本源代码（丑陋），或者猴子修补相关功能（坏）