在model.py文件中进行更改后无法保存表

时间：2019-05-22 07:05:20

标签： python django django-excel

我是django的新手，将不胜感激。

我已经安装了django-excel教程应用程序，并对其model.py文件进行了更改。

我已完成以下步骤：

1）python manage.py makemigrations民意调查

输出：“民意调查”的迁移：   民意调查\ migrations \ 0001_initial.py     -创建模型hpcl

2）python manage.py迁移民意调查

输出：要执行的操作：   应用所有迁移：民意调查 运行迁移：   没有要申请的迁移。

Model.py file 

from django.db import models


    class hpcl(models.Model):
        plannedPLT = models.IntegerField(default=0)
        pub_date = models.DateTimeField('date published')
        consumption = models.IntegerField(default=0)
        required_PLT = models.CharField(max_length=200)


        def __str__(self):
            return self.pub_date


Request Method: POST
Request URL: http://127.0.0.1:8000/polls/import/

Django Version: 2.2.1
Python Version: 3.7.3
Installed Applications:
('django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'polls')
Installed Middleware:
('django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware')



Traceback:

File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\backends\utils.py" in _execute
  84.                 return self.cursor.execute(sql, params)

File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\backends\sqlite3\base.py" in execute
  383.         return Database.Cursor.execute(self, query, params)

The above exception (no such table: polls_hpcl) was the direct cause of the following exception:

File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\django\core\handlers\exception.py" in inner
  34.             response = get_response(request)

File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\django\core\handlers\base.py" in _get_response
  115.                 response = self.process_exception_by_middleware(e, request)

File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\django\core\handlers\base.py" in _get_response
  113.                 response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "C:\Users\dhaval1.desai\Documents\Notes\Feedstock\Django-excelV2\django-excel-master\polls\views.py" in import_data
  53.                     ['plannedPLT', 'pub_date', 'consumption', 'required_PLT']

File "C:\Users\dhaval1.desai\Documents\Notes\Feedstock\Django-excelV2\django-excel-master\django_excel\__init__.py" in save_book_to_database
  63.         pe.save_book_as(**params)

File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\pyexcel\core.py" in save_book_as
  112.     return sources.save_book(book, **dest_keywords)

File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\pyexcel\internal\core.py" in save_book
  56.     return _save_any(a_source, book)

File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\pyexcel\internal\core.py" in _save_any
  60.     a_source.write_data(instance)

File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\pyexcel\plugins\sources\db_sources.py" in write_data
  111.             **self._keywords

File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\pyexcel\plugins\renderers\django.py" in render_book_to_stream
  75.             **keywords

File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\pyexcel_io\io.py" in save_data
  129.         **keywords

File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\pyexcel_io\io.py" in store_data
  146.         writer.write(data)

File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\pyexcel_io\book.py" in write
  221.                 sheet_writer.close()

File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\pyexcel_io\database\importers\django.py" in close
  58.                 an_object.save()

File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\models\base.py" in save
  741.                        force_update=force_update, update_fields=update_fields)

File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\models\base.py" in save_base
  779.                 force_update, using, update_fields,

File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\models\base.py" in _save_table
  870.             result = self._do_insert(cls._base_manager, using, fields, update_pk, raw)

File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\models\base.py" in _do_insert
  908.                                using=using, raw=raw)

File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\models\manager.py" in manager_method
  82.                 return getattr(self.get_queryset(), name)(*args, **kwargs)

File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\models\query.py" in _insert
  1186.         return query.get_compiler(using=using).execute_sql(return_id)

File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\models\sql\compiler.py" in execute_sql
  1335.                 cursor.execute(sql, params)

File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\backends\utils.py" in execute
  99.             return super().execute(sql, params)

File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\backends\utils.py" in execute
  67.         return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)

File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\backends\utils.py" in _execute_with_wrappers
  76.         return executor(sql, params, many, context)

File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\backends\utils.py" in _execute
  84.                 return self.cursor.execute(sql, params)

File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\utils.py" in __exit__
  89.                 raise dj_exc_value.with_traceback(traceback) from exc_value

File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\backends\utils.py" in _execute
  84.                 return self.cursor.execute(sql, params)

File "C:\Users\dhaval1.desai\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\backends\sqlite3\base.py" in execute
  383.         return Database.Cursor.execute(self, query, params)

Exception Type: OperationalError at /polls/import/
Exception Value: no such table: polls_hpcl

1 个答案:

答案 0 :(得分：0)

我按照答案中提到的步骤解决了上述问题： （查看详细说明） Django - no such table exception

您需要按照以下简单步骤来解决上述问题：

1）删除项目目录中的数据库（在我的情况下为db.sqlite3）

2）从项目子目录下的 pycache 文件夹中删除所有内容

3）对于您要修复的应用程序，转到文件夹并清除迁移和 pycache 目录

确定已清除所有上述文件后，运行：

python manage.py makemigrations

python manage.py migration

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