Python [Django]Django.db.utils.IntegrityError_Python_Django_Django Models

Python [Django]Django.db.utils.IntegrityError

python django django-models

Python [Django]Django.db.utils.IntegrityError,python,django,django-models,Python,Django,Django Models,我的应用程序名为mainsite 我在models.py中有一个名为Weather的table类 class Weather(models.Model): tpr = models.CharField(max_length=5) wet = models.CharField(max_length=5) ur = models.CharField(max_length=5) li = models.CharField(max_length=5) observ

我的应用程序名为mainsite

我在models.py中有一个名为Weather的table类

class Weather(models.Model):
    tpr = models.CharField(max_length=5)
    wet = models.CharField(max_length=5)
    ur = models.CharField(max_length=5)
    li = models.CharField(max_length=5)
    observe_time = models.DateTimeField(default=None)

我不想让我的

observe\u time

设置任何deafult值

所以我设置为“无”

我进行了迁移

当我做出决定的时候

然后发生回溯：

文件“manage.py”，第22行，在从命令行（sys.argv）执行命令

文件“C:\Users\User\Anaconda3\lib\site packages\django\core\management\uuuu init\uuuu.py”

第354行，从命令行执行命令

utility.execute()   File "C:\Users\User\Anaconda3\lib\site-packages\django\core\management\__init__.py",

执行中的第346行

self.fetch_command(subcommand).run_from_argv(self.argv)   File "C:\Users\User\Anaconda3\lib\site-packages\django\core\management\base.py",

output = self.handle(*args, **options)   File "C:\Users\User\Anaconda3\lib\site-packages\django\core\management\commands\migrate.py",

cursor.execute(sql, params)   File "C:\Users\User\Anaconda3\lib\site-packages\django\db\backends\utils.py",

return super(CursorDebugWrapper, self).execute(sql, params)   File "C:\Users\User\Anaconda3\lib\site-packages\django\db\backends\utils.py",

return self.cursor.execute(sql, params)   File "C:\Users\User\Anaconda3\lib\site-packages\django\db\utils.py", line

return self.cursor.execute(sql, params)   File "C:\Users\User\Anaconda3\lib\site-packages\django\db\backends\sqlite3\base.py",

return Database.Cursor.execute(self, query, params) django.db.utils.IntegrityError: NOT NULL constraint failed:

第394行，来自argv的运行中

self.execute(*args, **cmd_options)   File "C:\Users\User\Anaconda3\lib\site-packages\django\core\management\base.py",

执行中的第445行

self.fetch_command(subcommand).run_from_argv(self.argv)   File "C:\Users\User\Anaconda3\lib\site-packages\django\core\management\base.py",

output = self.handle(*args, **options)   File "C:\Users\User\Anaconda3\lib\site-packages\django\core\management\commands\migrate.py",

cursor.execute(sql, params)   File "C:\Users\User\Anaconda3\lib\site-packages\django\db\backends\utils.py",

return super(CursorDebugWrapper, self).execute(sql, params)   File "C:\Users\User\Anaconda3\lib\site-packages\django\db\backends\utils.py",

return self.cursor.execute(sql, params)   File "C:\Users\User\Anaconda3\lib\site-packages\django\db\utils.py", line

return self.cursor.execute(sql, params)   File "C:\Users\User\Anaconda3\lib\site-packages\django\db\backends\sqlite3\base.py",

return Database.Cursor.execute(self, query, params) django.db.utils.IntegrityError: NOT NULL constraint failed:

第222行，在句柄中

executor.migrate(targets, plan, fake=fake, fake_initial=fake_initial)   File

“C:\Users\User\Anaconda3\lib\site packages\django\db\migrations\executor.py”

第110行，在“迁移”中

self.apply_migration(states[migration], migration, fake=fake, fake_initial=fake_initial)   File

“C:\Users\User\Anaconda3\lib\site packages\django\db\migrations\executor.py”

第148行，在应用_迁移中

state = migration.apply(state, schema_editor)   File "C:\Users\User\Anaconda3\lib\site-packages\django\db\migrations\migration.py",

第115行中的“应用”

operation.database_forwards(self.app_label, schema_editor, old_state, project_state)   File

“C:\Users\User\Anaconda3\lib\site packages\django\db\migrations\operations\fields.py”

第62行，在数据库中

field,   File "C:\Users\User\Anaconda3\lib\site-packages\django\db\backends\sqlite3\schema.py",

第179行，在“添加”字段中

self._remake_table(model, create_fields=[field])   File "C:\Users\User\Anaconda3\lib\site-packages\django\db\backends\sqlite3\schema.py",

第147行，在表中

self.quote_name(model._meta.db_table),   File "C:\Users\User\Anaconda3\lib\site-packages\django\db\backends\base\schema.py",

执行中的第111行

self.fetch_command(subcommand).run_from_argv(self.argv)   File "C:\Users\User\Anaconda3\lib\site-packages\django\core\management\base.py",

output = self.handle(*args, **options)   File "C:\Users\User\Anaconda3\lib\site-packages\django\core\management\commands\migrate.py",

cursor.execute(sql, params)   File "C:\Users\User\Anaconda3\lib\site-packages\django\db\backends\utils.py",

return super(CursorDebugWrapper, self).execute(sql, params)   File "C:\Users\User\Anaconda3\lib\site-packages\django\db\backends\utils.py",

return self.cursor.execute(sql, params)   File "C:\Users\User\Anaconda3\lib\site-packages\django\db\utils.py", line

return self.cursor.execute(sql, params)   File "C:\Users\User\Anaconda3\lib\site-packages\django\db\backends\sqlite3\base.py",

return Database.Cursor.execute(self, query, params) django.db.utils.IntegrityError: NOT NULL constraint failed:

执行中的第79行

self.fetch_command(subcommand).run_from_argv(self.argv)   File "C:\Users\User\Anaconda3\lib\site-packages\django\core\management\base.py",

output = self.handle(*args, **options)   File "C:\Users\User\Anaconda3\lib\site-packages\django\core\management\commands\migrate.py",

cursor.execute(sql, params)   File "C:\Users\User\Anaconda3\lib\site-packages\django\db\backends\utils.py",

return super(CursorDebugWrapper, self).execute(sql, params)   File "C:\Users\User\Anaconda3\lib\site-packages\django\db\backends\utils.py",

return self.cursor.execute(sql, params)   File "C:\Users\User\Anaconda3\lib\site-packages\django\db\utils.py", line

return self.cursor.execute(sql, params)   File "C:\Users\User\Anaconda3\lib\site-packages\django\db\backends\sqlite3\base.py",

return Database.Cursor.execute(self, query, params) django.db.utils.IntegrityError: NOT NULL constraint failed:

第64行，在execute中

self.fetch_command(subcommand).run_from_argv(self.argv)   File "C:\Users\User\Anaconda3\lib\site-packages\django\core\management\base.py",

output = self.handle(*args, **options)   File "C:\Users\User\Anaconda3\lib\site-packages\django\core\management\commands\migrate.py",

cursor.execute(sql, params)   File "C:\Users\User\Anaconda3\lib\site-packages\django\db\backends\utils.py",

return super(CursorDebugWrapper, self).execute(sql, params)   File "C:\Users\User\Anaconda3\lib\site-packages\django\db\backends\utils.py",

return self.cursor.execute(sql, params)   File "C:\Users\User\Anaconda3\lib\site-packages\django\db\utils.py", line

return self.cursor.execute(sql, params)   File "C:\Users\User\Anaconda3\lib\site-packages\django\db\backends\sqlite3\base.py",

return Database.Cursor.execute(self, query, params) django.db.utils.IntegrityError: NOT NULL constraint failed:

98，在退出中

six.reraise(dj_exc_type, dj_exc_value, traceback) File "C:\Users\User\Anaconda3\lib\site-packages\django\utils\six.py", line
685，在雷莱斯

raise value.with_traceback(tb) File "C:\Users\User\Anaconda3\lib\site-packages\django\db\backends\utils.py",
第64行，在execute中

self.fetch_command(subcommand).run_from_argv(self.argv) File "C:\Users\User\Anaconda3\lib\site-packages\django\core\management\base.py",

output = self.handle(*args, **options) File "C:\Users\User\Anaconda3\lib\site-packages\django\core\management\commands\migrate.py",

cursor.execute(sql, params) File "C:\Users\User\Anaconda3\lib\site-packages\django\db\backends\utils.py",

return super(CursorDebugWrapper, self).execute(sql, params) File "C:\Users\User\Anaconda3\lib\site-packages\django\db\backends\utils.py",

return self.cursor.execute(sql, params) File "C:\Users\User\Anaconda3\lib\site-packages\django\db\utils.py", line

return self.cursor.execute(sql, params) File "C:\Users\User\Anaconda3\lib\site-packages\django\db\backends\sqlite3\base.py",

return Database.Cursor.execute(self, query, params) django.db.utils.IntegrityError: NOT NULL constraint failed:
第318行，执行中

self.fetch_command(subcommand).run_from_argv(self.argv) File "C:\Users\User\Anaconda3\lib\site-packages\django\core\management\base.py",

output = self.handle(*args, **options) File "C:\Users\User\Anaconda3\lib\site-packages\django\core\management\commands\migrate.py",

cursor.execute(sql, params) File "C:\Users\User\Anaconda3\lib\site-packages\django\db\backends\utils.py",

return super(CursorDebugWrapper, self).execute(sql, params) File "C:\Users\User\Anaconda3\lib\site-packages\django\db\backends\utils.py",

return self.cursor.execute(sql, params) File "C:\Users\User\Anaconda3\lib\site-packages\django\db\utils.py", line

return self.cursor.execute(sql, params) File "C:\Users\User\Anaconda3\lib\site-packages\django\db\backends\sqlite3\base.py",

return Database.Cursor.execute(self, query, params) django.db.utils.IntegrityError: NOT NULL constraint failed:
主站点\天气\新。观察\时间
我不知道是什么导致了这个错误

thx.
为了使其正常工作，您还应使此字段可为空和可为空，如下所示：

observe_time = models.DateTimeField(default=None, blank=True, null=True)

observe_time = models.DateTimeField(blank=True, null=True)
或者完全忽略
default=None
，如下所示：

observe_time = models.DateTimeField(default=None, blank=True, null=True)

observe_time = models.DateTimeField(blank=True, null=True)
此外，在此之后，不要忘记删除上一个迁移文件，并再次运行
makemigrations
和
migrate