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How to use _migrate_from_base method in autotest

Best Python code snippet using autotest_python

migrate.py

Source:migrate.py

...135        self.set_db_version(new_version)136    def migrate_to_version(self, version):137        current_version = self.get_db_version()138        if current_version == 0 and self._config_section() == 'AUTOTEST_WEB':139            self._migrate_from_base()140            current_version = self.get_db_version()141        if current_version < version:142            lower, upper = current_version, version143            migrate_up = True144        else:145            lower, upper = version, current_version146            migrate_up = False147        migrations = self.get_migrations(lower + 1, upper)148        if not migrate_up:149            migrations.reverse()150        for migration in migrations:151            self.do_migration(migration, migrate_up)152        assert self.get_db_version() == version153        print 'At version', version154    def _migrate_from_base(self):155        self.confirm_initialization()156        migration_script = utils.read_file(157                os.path.join(os.path.dirname(__file__), 'schema_051.sql'))158        migration_script = migration_script % (159                dict(username=self._database.get_database_info()['username']))160        self.execute_script(migration_script)161        self.create_migrate_table()162        self.set_db_version(51)163    def confirm_initialization(self):164        if not self.force:165            response = raw_input(166                'Your %s database does not appear to be initialized.  Do you '167                'want to recreate it (this will result in loss of any existing '168                'data) (yes/No)? ' % self.get_db_name())...

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