解决django migrate报错ORA-02000: missing ALWAYS keyword

错误信息

PS D:parttimepythondjangoguanxiangzhiji> python manage.py migrateOperations to perform: Apply all migrations: admin, auth, contenttypes, sessionsRunning migrations:Traceback (most recent call last): File 'D:appanacondalibsite-packagesdjangodbbackendsutils.py', line 82, in _execute return self.cursor.execute(sql) File 'D:appanacondalibsite-packagesdjangodbbackendsoraclebase.py', line 510, in execute return self.cursor.execute(query, self._param_generator(params))cx_Oracle.DatabaseError: ORA-02000: missing ALWAYS keywordThe above exception was the direct cause of the following exception:Traceback (most recent call last): File 'D:appanacondalibsite-packagesdjangodbmigrationsrecorder.py', line 67, in ensure_schema editor.create_model(self.Migration) File 'D:appanacondalibsite-packagesdjangodbbackendsbaseschema.py', line 307, in create_model self.execute(sql, params or None) File 'D:appanacondalibsite-packagesdjangodbbackendsbaseschema.py', line 137, in execute cursor.execute(sql, params) File 'D:appanacondalibsite-packagesdjangodbbackendsutils.py', line 99, in execute return super().execute(sql, params) File 'D:appanacondalibsite-packagesdjangodbbackendsutils.py', line 67, in execute return self._execute_with_wrappers(sql, params, many=False, executor=self._execute) File 'D:appanacondalibsite-packagesdjangodbbackendsutils.py', line 76, in _execute_with_wrappers return executor(sql, params, many, context) File 'D:appanacondalibsite-packagesdjangodbbackendsutils.py', line 84, in _execute return self.cursor.execute(sql, params) File 'D:appanacondalibsite-packagesdjangodbutils.py', line 89, in __exit__ raise dj_exc_value.with_traceback(traceback) from exc_value File 'D:appanacondalibsite-packagesdjangodbbackendsutils.py', line 82, in _execute return self.cursor.execute(sql) File 'D:appanacondalibsite-packagesdjangodbbackendsoraclebase.py', line 510, in execute return self.cursor.execute(query, self._param_generator(params))django.db.utils.DatabaseError: ORA-02000: missing ALWAYS keywordDuring 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:appanacondalibsite-packagesdjangocoremanagement__init__.py', line 381, in execute_from_command_line utility.execute() File 'D:appanacondalibsite-packagesdjangocoremanagement__init__.py', line 375, in execute self.fetch_command(subcommand).run_from_argv(self.argv) File 'D:appanacondalibsite-packagesdjangocoremanagementbase.py', line 323, in run_from_argv self.execute(*args, **cmd_options) File 'D:appanacondalibsite-packagesdjangocoremanagementbase.py', line 364, in execute output = self.handle(*args, **options) File 'D:appanacondalibsite-packagesdjangocoremanagementbase.py', line 83, in wrapped res = handle_func(*args, **kwargs) File 'D:appanacondalibsite-packagesdjangocoremanagementcommandsmigrate.py', line 234, in handle fake_initial=fake_initial, File 'D:appanacondalibsite-packagesdjangodbmigrationsexecutor.py', line 91, in migrate self.recorder.ensure_schema() File 'D:appanacondalibsite-packagesdjangodbmigrationsrecorder.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

以上这篇解决django migrate报错ORA-02000: missing ALWAYS keyword就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持好吧啦网。