Relative Migration Identifiers

相对迁移标识符

Relative upgrades/downgrades are also supported. To move two versions from the current, a decimal value “+N” can be supplied:

还支持相对升级/降级。 要从当前移动两个版本，可以提供十进制值“+N”：

alembic upgrade +2

Negative values are accepted for downgrades:

降级接受负值：

alembic downgrade -1

Relative identifiers may also be in terms of a specific revision. For example, to upgrade to revision ae1027a6acf plus two additional steps:

相对标识符也可以是特定版本。 例如，要升级到修订版 ae1027a6acf 加上两个额外的步骤：

alembic upgrade ae10+2