解决django migrate报错ORA-02000: missing ALWAYS keyword

错误信息

PS D:\parttime\python\django\guanxiangzhiji> python manage.py migrate
Operations to perform:
 Apply all migrations: admin, auth, contenttypes, sessions
Running migrations:
Traceback (most recent call last):
 File "D:\app\anaconda\lib\site-packages\django\db\backends\utils.py", line 82, in _execute
 return self.cursor.execute(sql)
 File "D:\app\anaconda\lib\site-packages\django\db\backends\oracle\base.py", line 510, in execute
 return self.cursor.execute(query, self._param_generator(params))
cx_Oracle.DatabaseError: ORA-02000: missing ALWAYS keyword

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
 File "D:\app\anaconda\lib\site-packages\django\db\migrations\recorder.py", line 67, in ensure_schema
 editor.create_model(self.Migration)
 File "D:\app\anaconda\lib\site-packages\django\db\backends\base\schema.py", line 307, in create_model
 self.execute(sql, params or None)
 File "D:\app\anaconda\lib\site-packages\django\db\backends\base\schema.py", line 137, in execute
 cursor.execute(sql, params)
 File "D:\app\anaconda\lib\site-packages\django\db\backends\utils.py", line 99, in execute
 return super().execute(sql, params)
 File "D:\app\anaconda\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 "D:\app\anaconda\lib\site-packages\django\db\backends\utils.py", line 76, in _execute_with_wrappers
 return executor(sql, params, many, context)
 File "D:\app\anaconda\lib\site-packages\django\db\backends\utils.py", line 84, in _execute
 return self.cursor.execute(sql, params)
 File "D:\app\anaconda\lib\site-packages\django\db\utils.py", line 89, in __exit__
 raise dj_exc_value.with_traceback(traceback) from exc_value
 File "D:\app\anaconda\lib\site-packages\django\db\backends\utils.py", line 82, in _execute
 return self.cursor.execute(sql)
 File "D:\app\anaconda\lib\site-packages\django\db\backends\oracle\base.py", line 510, in execute
 return self.cursor.execute(query, self._param_generator(params))
django.db.utils.DatabaseError: ORA-02000: missing ALWAYS keyword

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 "D:\app\anaconda\lib\site-packages\django\core\management\__init__.py", line 381, in execute_from_command_line
 utility.execute()
 File "D:\app\anaconda\lib\site-packages\django\core\management\__init__.py", line 375, in execute
 self.fetch_command(subcommand).run_from_argv(self.argv)
 File "D:\app\anaconda\lib\site-packages\django\core\management\base.py", line 323, in run_from_argv
 self.execute(*args, **cmd_options)
 File "D:\app\anaconda\lib\site-packages\django\core\management\base.py", line 364, in execute
 output = self.handle(*args, **options)
 File "D:\app\anaconda\lib\site-packages\django\core\management\base.py", line 83, in wrapped
 res = handle_func(*args, **kwargs)
 File "D:\app\anaconda\lib\site-packages\django\core\management\commands\migrate.py", line 234, in handle
 fake_initial=fake_initial,
 File "D:\app\anaconda\lib\site-packages\django\db\migrations\executor.py", line 91, in migrate
 self.recorder.ensure_schema()
 File "D:\app\anaconda\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 (ORA-02000: missing ALWAYS keyword)

环境情况

1、操作系统：Win10 64bit

2、Python版本：3.7.3

3、django版本：2.2.4

4、Oracle版本：11.2.0.4

5、cx_oracle版本：7.0.0

6、settings配置

原因分析

从错误提示ORA-02000: missing ALWAYS keyword看，是SQL语法错误，创建表的时候使用了Always这个关键词。 Always是在Oracle12c的新特性自增序列里用到的，语法如下：

generated-column-spec
[ GENERATED { ALWAYS | BY DEFAULT } AS IDENTITY 
[ ( START WITH IntegerConstant 
[ ,INCREMENT BY IntegerConstant] ) ] ] ]

但是，我机器上用的是Oracle11.2.0.4版本，这个语法在11g版本里执行自然就会报ORA-02000的错误。

解决方案

看了网上的一些解决方案，主要有2种：

（1）将Oracle升级到12c

（2）将cx_oracle降低版本

刚开始选用方案（2），觉得简单，但是实际操作下来，问题一环套一环，比如说将cx_oracle降低版本后，接着出现了django版本与cx_oracle版本不适应的情况，接着又降低django版本。。。接着做还是不行，最终放弃了。不知道有没有人成功过。

重新选择方案（1），装了Oracle12.1.0.2

再将django和cx_oracle升级回最新版本，migrate的时候就成功了

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