这是我学习时的笔记：
https://blog.csdn.net/u013916480/article/details/104819213
D:\software\Django_project\project_test>python manage.py makemigrations
Traceback (most recent call last):
File "C:\Users\fengrui\AppData\Local\Programs\Python\Python38\lib\site-packages\django\db\backends\base\base.py", line 217, in ensure_connection
self.connect()
File "C:\Users\fengrui\AppData\Local\Programs\Python\Python38\lib\site-packages\django\db\backends\base\base.py", line 195, in connect
self.connection = self.get_new_connection(conn_params)
File "C:\Users\fengrui\AppData\Local\Programs\Python\Python38\lib\site-packages\django\db\backends\sqlite3\base.py", line 194, in get_new_connection
conn = Database.connect(**conn_params)
sqlite3.OperationalError: unable to open database file
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "manage.py", line 21, in <module>
main()
File "manage.py", line 17, in main
execute_from_command_line(sys.argv)
File "C:\Users\fengrui\AppData\Local\Programs\Python\Python38\lib\site-packages\django\core\management\__init__.py", line 381, in execute_from_command_line
utility.execute()
File "C:\Users\fengrui\AppData\Local\Programs\Python\Python38\lib\site-packages\django\core\management\__init__.py", line 375, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "C:\Users\fengrui\AppData\Local\Programs\Python\Python38\lib\site-packages\django\core\management\base.py", line 323, in run_from_argv
self.execute(*args, **cmd_options)
File "C:\Users\fengrui\AppData\Local\Programs\Python\Python38\lib\site-packages\django\core\management\base.py", line 364, in execute
output = self.handle(*args, **options)
File "C:\Users\fengrui\AppData\Local\Programs\Python\Python38\lib\site-packages\django\core\management\base.py", line 83, in wrapped
res = handle_func(*args, **kwargs)
File "C:\Users\fengrui\AppData\Local\Programs\Python\Python38\lib\site-packages\django\core\management\commands\makemigrations.py", line 101, in handle
loader.check_consistent_history(connection)
File "C:\Users\fengrui\AppData\Local\Programs\Python\Python38\lib\site-packages\django\db\migrations\loader.py", line 283, in check_consistent_history
applied = recorder.applied_migrations()
File "C:\Users\fengrui\AppData\Local\Programs\Python\Python38\lib\site-packages\django\db\migrations\recorder.py", line 73, in applied_migrations
if self.has_table():
File "C:\Users\fengrui\AppData\Local\Programs\Python\Python38\lib\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 "C:\Users\fengrui\AppData\Local\Programs\Python\Python38\lib\site-packages\django\db\backends\base\base.py", line 256, in cursor
return self._cursor()
File "C:\Users\fengrui\AppData\Local\Programs\Python\Python38\lib\site-packages\django\db\backends\base\base.py", line 233, in _cursor
self.ensure_connection()
File "C:\Users\fengrui\AppData\Local\Programs\Python\Python38\lib\site-packages\django\db\backends\base\base.py", line 217, in ensure_connection
self.connect()
File "C:\Users\fengrui\AppData\Local\Programs\Python\Python38\lib\site-packages\django\db\utils.py", line 89, in __exit__
raise dj_exc_value.with_traceback(traceback) from exc_value
File "C:\Users\fengrui\AppData\Local\Programs\Python\Python38\lib\site-packages\django\db\backends\base\base.py", line 217, in ensure_connection
self.connect()
File "C:\Users\fengrui\AppData\Local\Programs\Python\Python38\lib\site-packages\django\db\backends\base\base.py", line 195, in connect
self.connection = self.get_new_connection(conn_params)
File "C:\Users\fengrui\AppData\Local\Programs\Python\Python38\lib\site-packages\django\db\backends\sqlite3\base.py", line 194, in get_new_connection
conn = Database.connect(**conn_params)
django.db.utils.OperationalError: unable to open database file
django.db.utils.OperationalError: unable to open database file
无法打开数据库文件
检查文件的路径权限是否存在是否合法
你的所有步骤都在一台机器上完成吗？还是拷贝过项目。
可能两种情况：
一 、 如果你在高版本的sqlite3 上建立了django项目 , 拷贝到配置了低版本sqlite的 python 环境， 那么 打开文件时， 就会有这个提示。
二 、 另外， 如果 db 文件损坏，也会造成这个提示。
如果是第一种情况，有两种解决方法。
1、 升级运行项目的 环境中 sqlite 到最新
2 、 重新 django-admin startproject , 再把相关的 模板文件， py 文件 拷贝到新项目中。 记得 不要拷贝旧项目的 db 文件。