Django 框架可以根据实体类 去生成 数据库表,我们只需要执行
python manage.py makemigrations
python manage.py migrate
即可
这两条指令的作用如下 :
python manage.py makemigrations 用于生成迁移文件
python manage.py migrate 用于根据迁移文件生成数据库文件
在我执行过程中遇到了如下问题:
The above exception was the direct cause of the following exception:
扫描二维码关注公众号,回复: 10761533 查看本文章Traceback (most recent call last):
File "E:\PYTHON_HOME\Python37\lib\site-packages\django\db\migrations\recorder.py", line 67, in ensure_schema
editor.create_model(self.Migration)
File "E:\PYTHON_HOME\Python37\lib\site-packages\django\db\backends\base\schema.py", line 307, in create_model
self.execute(sql, params or None)
File "E:\PYTHON_HOME\Python37\lib\site-packages\django\db\backends\base\schema.py", line 137, in execute
cursor.execute(sql, params)
File "E:\PYTHON_HOME\Python37\lib\site-packages\django\db\backends\utils.py", line 99, in execute
return super().execute(sql, params)
File "E:\PYTHON_HOME\Python37\lib\site-packages\django\db\backends\utils.py", line 67, in execute
return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
File "E:\PYTHON_HOME\Python37\lib\site-packages\django\db\backends\utils.py", line 76, in _execute_with_wrappers
return executor(sql, params, many, context)
File "E:\PYTHON_HOME\Python37\lib\site-packages\django\db\backends\utils.py", line 84, in _execute
return self.cursor.execute(sql, params)
File "E:\PYTHON_HOME\Python37\lib\site-packages\django\db\utils.py", line 89, in __exit__
raise dj_exc_value.with_traceback(traceback) from exc_value
File "E:\PYTHON_HOME\Python37\lib\site-packages\django\db\backends\utils.py", line 82, in _execute
return self.cursor.execute(sql)
File "E:\PYTHON_HOME\Python37\lib\site-packages\django\db\backends\mysql\base.py", line 71, in execute
return self.cursor.execute(query, args)
File "E:\PYTHON_HOME\Python37\lib\site-packages\pymysql\cursors.py", line 170, in execute
result = self._query(query)
File "E:\PYTHON_HOME\Python37\lib\site-packages\pymysql\cursors.py", line 328, in _query
conn.query(q)
File "E:\PYTHON_HOME\Python37\lib\site-packages\pymysql\connections.py", line 517, in query
self._affected_rows = self._read_query_result(unbuffered=unbuffered)
File "E:\PYTHON_HOME\Python37\lib\site-packages\pymysql\connections.py", line 732, in _read_query_result
result.read()
File "E:\PYTHON_HOME\Python37\lib\site-packages\pymysql\connections.py", line 1075, in read
first_packet = self.connection._read_packet()
File "E:\PYTHON_HOME\Python37\lib\site-packages\pymysql\connections.py", line 684, in _read_packet
packet.check_error()
File "E:\PYTHON_HOME\Python37\lib\site-packages\pymysql\protocol.py", line 220, in check_error
err.raise_mysql_exception(self._data)
File "E:\PYTHON_HOME\Python37\lib\site-packages\pymysql\err.py", line 109, in raise_mysql_exception
raise errorclass(errno, errval)
django.db.utils.ProgrammingError: (1064, "You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '(6) NOT
NULL)' at line 1")During handling of the above exception, another exception occurred:
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 "E:\PYTHON_HOME\Python37\lib\site-packages\django\core\management\__init__.py", line 381, in execute_from_command_line
utility.execute()
File "E:\PYTHON_HOME\Python37\lib\site-packages\django\core\management\__init__.py", line 375, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "E:\PYTHON_HOME\Python37\lib\site-packages\django\core\management\base.py", line 323, in run_from_argv
self.execute(*args, **cmd_options)
File "E:\PYTHON_HOME\Python37\lib\site-packages\django\core\management\base.py", line 364, in execute
output = self.handle(*args, **options)
File "E:\PYTHON_HOME\Python37\lib\site-packages\django\core\management\base.py", line 83, in wrapped
res = handle_func(*args, **kwargs)
File "E:\PYTHON_HOME\Python37\lib\site-packages\django\core\management\commands\migrate.py", line 234, in handle
fake_initial=fake_initial,
File "E:\PYTHON_HOME\Python37\lib\site-packages\django\db\migrations\executor.py", line 91, in migrate
self.recorder.ensure_schema()
File "E:\PYTHON_HOME\Python37\lib\site-packages\django\db\migrations\recorder.py", line 69, in ensure_schema
raise MigrationSchemaMissing("Unable to create the django_migrations table (%s)" % exc)
django.db.migrations.exceptions.MigrationSchemaMissing: Unable to create the django_migrations table ((1064, "You have an error in your SQL syntax; check the manual that corresponds to
your MySQL server version for the right syntax to use near '(6) NOT NULL)' at line 1"))
最终定位到的问题原因 是 MySQL 版本问题,
Django2.1不再支持MySQL5.5,必须5.6版本以上
查看MySQL版本
https://www.cnblogs.com/wujf-myblog/p/9570870.html
在客户端 运行
SELECT VERSION();
所以有两种方案 :
1)降低 Django版本
降低 Django 版本指令:
pip install Django==2.0.0
2)MySQL 升级
请参考我的另一篇文章 :