Blog de jcLee95 : https://blog.csdn.net/qq_28550263
Dirección de este artículo : https://blog.csdn.net/qq_28550263/article/details/132862795
Tabla de contenido
1. Descripción
Hubo un problema con Django al intentar crear la tabla de la base de datos al intentar ejecutar python enable.py migrar debido a un estado confuso del historial de migración. El mensaje de error menciona que falta una tabla django_content_type, que es la tabla que Django usa para rastrear el ContentType de un modelo.
La información general del error es la siguiente:
Operations to perform:
Apply all migrations: admin, auth, contenttypes, sessions, users
Running migrations:
No migrations to apply.
Traceback (most recent call last):
File "C:\Python311\Lib\site-packages\django\db\backends\utils.py", line 89, in _execute
return self.cursor.execute(sql, params)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Python311\Lib\site-packages\django\db\backends\sqlite3\base.py", line 357, in execute
return Database.Cursor.execute(self, query, params)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
sqlite3.OperationalError: no such table: django_content_type
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "D:\desktop\jcmusic\manage.py", line 22, in <module>
main()
File "D:\desktop\jcmusic\manage.py", line 18, in main
execute_from_command_line(sys.argv)
File "C:\Python311\Lib\site-packages\django\core\management\__init__.py", line 446, in execute_from_command_line
utility.execute()
File "C:\Python311\Lib\site-packages\django\core\management\__init__.py", line 440, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "C:\Python311\Lib\site-packages\django\core\management\base.py", line 402, in run_from_argv
self.execute(*args, **cmd_options)
File "C:\Python311\Lib\site-packages\django\core\management\base.py", line 448, in execute
output = self.handle(*args, **options)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Python311\Lib\site-packages\django\core\management\base.py", line 96, in wrapped
res = handle_func(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Python311\Lib\site-packages\django\core\management\commands\migrate.py", line 376, in handle
emit_post_migrate_signal(
File "C:\Python311\Lib\site-packages\django\core\management\sql.py", line 52, in emit_post_migrate_signal
models.signals.post_migrate.send(
File "C:\Python311\Lib\site-packages\django\dispatch\dispatcher.py", line 176, in send
return [
^
File "C:\Python311\Lib\site-packages\django\dispatch\dispatcher.py", line 177, in <listcomp>
(receiver, receiver(signal=self, sender=sender, **named))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Python311\Lib\site-packages\django\contrib\auth\management\__init__.py", line 51, in create_permissions
create_contenttypes(
File "C:\Python311\Lib\site-packages\django\contrib\contenttypes\management\__init__.py", line 127, in create_contenttypes
content_types, app_models = get_contenttypes_and_models(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Python311\Lib\site-packages\django\contrib\contenttypes\management\__init__.py", line 98, in get_contenttypes_and_models
content_types = {
^
File "C:\Python311\Lib\site-packages\django\db\models\query.py", line 394, in __iter__
self._fetch_all()
File "C:\Python311\Lib\site-packages\django\db\models\query.py", line 1867, in _fetch_all
self._result_cache = list(self._iterable_class(self))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Python311\Lib\site-packages\django\db\models\query.py", line 87, in __iter__
results = compiler.execute_sql(
^^^^^^^^^^^^^^^^^^^^^
File "C:\Python311\Lib\site-packages\django\db\models\sql\compiler.py", line 1398, in execute_sql
cursor.execute(sql, params)
File "C:\Python311\Lib\site-packages\django\db\backends\utils.py", line 102, in execute
return super().execute(sql, params)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Python311\Lib\site-packages\django\db\backends\utils.py", line 67, in execute
return self._execute_with_wrappers(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Python311\Lib\site-packages\django\db\backends\utils.py", line 80, in _execute_with_wrappers
return executor(sql, params, many, context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Python311\Lib\site-packages\django\db\backends\utils.py", line 84, in _execute
with self.db.wrap_database_errors:
File "C:\Python311\Lib\site-packages\django\db\utils.py", line 91, in __exit__
raise dj_exc_value.with_traceback(traceback) from exc_value
File "C:\Python311\Lib\site-packages\django\db\backends\utils.py", line 89, in _execute
return self.cursor.execute(sql, params)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Python311\Lib\site-packages\django\db\backends\sqlite3\base.py", line 357, in execute
return Database.Cursor.execute(self, query, params)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
django.db.utils.OperationalError: no such table: django_content_type
Decidí usar Django Shell para borrar la tabla de la base de datos. Registre el proceso.
2. Pasos
Copia de seguridad de datos importantes
Antes de realizar la limpieza, asegúrese de haber realizado una copia de seguridad de todos los datos importantes utilizando diversos medios y luego borre todas las tablas de la base de datos.
Ingrese al shell de Django
python manage.py shell
Introduzca el guión
Copie el script de eliminación de tablas escrito a continuación en el shell interactivo y presione Entrar para iniciar la ejecución.
from django.db import connection
cursor = connection.cursor()
cursor.execute("SELECT name FROM sqlite_master WHERE type='table';")
tables = cursor.fetchall()
for table in tables:
cursor.execute(f"DELETE FROM {
table[0]};")
Luego ingrese la función de salida para salir del entorno Django Shell.
exit()
Bien, ahora puedes recrear las migraciones y las tablas de la base de datos:
python manage.py makemigrations
python manage.py migrate