migrator.py 文件源码

def __get_migrator(self):
        if isinstance(self.db.engine, peewee.SqliteDatabase) or isinstance(self.db.engine, SqliteExtDatabase):
            return SqliteMigrator(self.db.engine)
        elif isinstance(self.db.engine, peewee.MySQLDatabase):
            return MySQLMigrator(self.db.engine)
        elif isinstance(self.db.engine, peewee.PostgresqlDatabase):
            return PostgresqlMigrator(self.db.engine)
        raise ImproperlyConfigured('Database engine doesn\'t support Migrations!')