django.db.utils.InternalError:(1050,“表'django_content_type'已经存在") [英] django.db.utils.InternalError: (1050, "Table 'django_content_type' already exists")
问题描述
django.db.utils.InternalError:(1050,表'django_content_type'已经存在")
django.db.utils.InternalError: (1050, "Table 'django_content_type' already exists")
我刚刚从我的朋友那里复制了一个项目,当我进行makemirations时,它可以正常运行.但对于-
I just copied a project from my friend, when I run makemirations it runs properly. But for -
python3 manage.py migrate
出现此错误-
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:
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 "/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并使用drop table命令删除'DJANGO_CONTENT_TYPE表时,出现此错误-
When I opened MySQL to delete 'DJANGO_CONTENT_TYPE table with drop table command, it gives this error -
mysql> drop table django_content_type;
ERROR 1217 (23000): Cannot delete or update a parent row: a foreign key constraint fails
即我无法删除该表.
我之所以进行迁移是因为我对模型进行了一些更改.
I did migrations because I did some changes in model.
尽管我找到了一种替代方法,可以通过逻辑而不是绕过此错误.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了另一个数据库.
Though I found an alternative to bypass this error not by logic. I created a nee database and changed settings to new database. Here I copied the content from initial database to another.
推荐答案
对于django3:我收到此错误:django.db.utils.OperationalError:(1054,"django_content_type"中的未知列"名称"")
For django3: I get this error: django.db.utils.OperationalError: (1054, "Unknown column 'name' in 'django_content_type'")
-
删除myapp/migrations/0001_initial.py和0002_ .....
Delete myapp/migrations/0001_initial.py and 0002_ .....
从django_migrations表中删除所有行.
Delete all rows from the django_migrations table.
Delete * from django_migrations
python3 manage.py makemigrations
或
python manage.py makemigrations
-
python3 manage.py migration --fake-initial
或
python manage.py migrate --fake-initial
-
我收到此错误:MySQLdb._exceptions.OperationalError:(1054,"django_content_type"中的未知列"名称"))
I get this error: MySQLdb._exceptions.OperationalError: (1054, "Unknown column 'name' in 'django_content_type'")
我在django_content_type表中添加一列.
I add a column to django_content_type table.
更改表django_content_type添加名称varchar(255)
alter table django_content_type add name varchar(255)
python3 manage.py migration --fake-initial
出现此错误django.db.utils.OperationalError:(1061,重复键名'django_site_domain_a2e37b91_uniq'")
This error appears django.db.utils.OperationalError: (1061, "Duplicate key name 'django_site_domain_a2e37b91_uniq'")
我没有任何关于此错误的信息,但我的网站运行正常.名称"列将删除
I did not anything about this error but my website works perfectly. 'name' column will remove
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