django.db.utils.InternalError: (1050, “表 'django_content_type' 已经存在”)
我刚刚从我的 friend 那里复制了一个项目，当我运行 makemirations 时，它运行正常。但对于 -
python3 manage.py migrate
它给出了这个错误 -
Operations to perform:
Apply all migrations: admin, auth, balancesheet, contenttypes, dynapp, pandl2, sessions, trialbal2
Running migrations:
Applying contenttypes.0001_initial...Traceback (most recent call last):
File "/home/hostbooks/django1/myproject/lib/python3.6/site-packages/django/db/backends/utils.py", line 82, in _execute
return self.cursor.execute(sql)
File "/home/hostbooks/django1/myproject/lib/python3.6/site-packages/django/db/backends/mysql/base.py", line 74, in execute
return self.cursor.execute(query, args)
File "/home/hostbooks/django1/myproject/lib/python3.6/site-packages/pymysql/cursors.py", line 170, in execute
result = self._query(query)
File "/home/hostbooks/django1/myproject/lib/python3.6/site-packages/pymysql/cursors.py", line 328, in _query
conn.query(q)
File "/home/hostbooks/django1/myproject/lib/python3.6/site-packages/pymysql/connections.py", line 517, in query
self._affected_rows = self._read_query_result(unbuffered=unbuffered)
File "/home/hostbooks/django1/myproject/lib/python3.6/site-packages/pymysql/connections.py", line 732, in _read_query_result
result.read()
File "/home/hostbooks/django1/myproject/lib/python3.6/site-packages/pymysql/connections.py", line 1075, in read
first_packet = self.connection._read_packet()
File "/home/hostbooks/django1/myproject/lib/python3.6/site-packages/pymysql/connections.py", line 684, in _read_packet
packet.check_error()
File "/home/hostbooks/django1/myproject/lib/python3.6/site-packages/pymysql/protocol.py", line 220, in check_error
err.raise_mysql_exception(self._data)
File "/home/hostbooks/django1/myproject/lib/python3.6/site-packages/pymysql/err.py", line 109, in raise_mysql_exception
raise errorclass(errno, errval)
pymysql.err.InternalError: (1050, "Table 'django_content_type' already exists")
上述异常是以下异常的直接原因:
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 "/home/hostbooks/django1/myproject/lib/python3.6/site-packages/django/core/management/__init__.py", line 381, in execute_from_command_line
utility.execute()
File "/home/hostbooks/django1/myproject/lib/python3.6/site-packages/django/core/management/__init__.py", line 375, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/home/hostbooks/django1/myproject/lib/python3.6/site-packages/django/core/management/base.py", line 323, in run_from_argv
self.execute(*args, **cmd_options)
File "/home/hostbooks/django1/myproject/lib/python3.6/site-packages/django/core/management/base.py", line 364, in execute
output = self.handle(*args, **options)
File "/home/hostbooks/django1/myproject/lib/python3.6/site-packages/django/core/management/base.py", line 83, in wrapped
res = handle_func(*args, **kwargs)
File "/home/hostbooks/django1/myproject/lib/python3.6/site-packages/django/core/management/commands/migrate.py", line 234, in handle
fake_initial=fake_initial,
File "/home/hostbooks/django1/myproject/lib/python3.6/site-packages/django/db/migrations/executor.py", line 117, in migrate
state = self._migrate_all_forwards(state, plan, full_plan, fake=fake, fake_initial=fake_initial)
File "/home/hostbooks/django1/myproject/lib/python3.6/site-packages/django/db/migrations/executor.py", line 147, in _migrate_all_forwards
state = self.apply_migration(state, migration, fake=fake, fake_initial=fake_initial)
File "/home/hostbooks/django1/myproject/lib/python3.6/site-packages/django/db/migrations/executor.py", line 245, in apply_migration
state = migration.apply(state, schema_editor)
File "/home/hostbooks/django1/myproject/lib/python3.6/site-packages/django/db/migrations/migration.py", line 124, in apply
operation.database_forwards(self.app_label, schema_editor, old_state, project_state)
File "/home/hostbooks/django1/myproject/lib/python3.6/site-packages/django/db/migrations/operations/models.py", line 92, in database_forwards
schema_editor.create_model(model)
File "/home/hostbooks/django1/myproject/lib/python3.6/site-packages/django/db/backends/base/schema.py", line 307, in create_model
self.execute(sql, params or None)
File "/home/hostbooks/django1/myproject/lib/python3.6/site-packages/django/db/backends/base/schema.py", line 137, in execute
cursor.execute(sql, params)
File "/home/hostbooks/django1/myproject/lib/python3.6/site-packages/django/db/backends/utils.py", line 99, in execute
return super().execute(sql, params)
File "/home/hostbooks/django1/myproject/lib/python3.6/site-packages/django/db/backends/utils.py", line 67, in execute
return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
File "/home/hostbooks/django1/myproject/lib/python3.6/site-packages/django/db/backends/utils.py", line 76, in _execute_with_wrappers
return executor(sql, params, many, context)
File "/home/hostbooks/django1/myproject/lib/python3.6/site-packages/django/db/backends/utils.py", line 84, in _execute
return self.cursor.execute(sql, params)
File "/home/hostbooks/django1/myproject/lib/python3.6/site-packages/django/db/utils.py", line 89, in __exit__
raise dj_exc_value.with_traceback(traceback) from exc_value
File "/home/hostbooks/django1/myproject/lib/python3.6/site-packages/django/db/backends/utils.py", line 82, in _execute
return self.cursor.execute(sql)
File "/home/hostbooks/django1/myproject/lib/python3.6/site-packages/django/db/backends/mysql/base.py", line 74, in execute
return self.cursor.execute(query, args)
File "/home/hostbooks/django1/myproject/lib/python3.6/site-packages/pymysql/cursors.py", line 170, in execute
result = self._query(query)
File "/home/hostbooks/django1/myproject/lib/python3.6/site-packages/pymysql/cursors.py", line 328, in _query
conn.query(q)
File "/home/hostbooks/django1/myproject/lib/python3.6/site-packages/pymysql/connections.py", line 517, in query
self._affected_rows = self._read_query_result(unbuffered=unbuffered)
File "/home/hostbooks/django1/myproject/lib/python3.6/site-packages/pymysql/connections.py", line 732, in _read_query_result
result.read()
File "/home/hostbooks/django1/myproject/lib/python3.6/site-packages/pymysql/connections.py", line 1075, in read
first_packet = self.connection._read_packet()
File "/home/hostbooks/django1/myproject/lib/python3.6/site-packages/pymysql/connections.py", line 684, in _read_packet
packet.check_error()
File "/home/hostbooks/django1/myproject/lib/python3.6/site-packages/pymysql/protocol.py", line 220, in check_error
err.raise_mysql_exception(self._data)
File "/home/hostbooks/django1/myproject/lib/python3.6/site-packages/pymysql/err.py", line 109, in raise_mysql_exception
raise errorclass(errno, errval)
django.db.utils.InternalError: (1050, "Table 'django_content_type' already exists")
django.db.utils.InternalError: (1050, "Table 'django_content_type' already exists")
当我打开 MySQL 以使用 drop table 命令删除 'DJANGO_CONTENT_TYPE 表时，它给出了这个错误 -
mysql> drop table django_content_type;
ERROR 1217 (23000): Cannot delete or update a parent row: a foreign key constraint fails
即我不能删除这个表。
我进行了迁移，因为我对模型进行了一些更改。
虽然我找到了一种替代方法来绕过这个错误，而不是通过逻辑。我创建了一个 nee 数据库并将设置更改为新数据库。在这里，我将内容从初始数据库复制到另一个数据库。
最佳答案
对于 Django3:
我收到此错误:
django.db.utils.OperationalError: (1054, “'django_content_type' 中的未知列 'name'”)
Delete * from django_migrations
python3 manage.py makemigrations 或者
python manage.py makemigrations
python3 manage.py migrate --fake-initial 或者
python manage.py migrate --fake-initial
MySQLdb._exceptions.OperationalError: (1054, “'django_content_type' 中的未知列 'name'”)
更改表 django_content_type 添加名称 varchar(255)
python3 manage.py migrate --fake-initial 'name' 列将删除
关于python - django.db.utils.InternalError : (1050, "Table ' django_content_type' 已经存在")，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/59999242/