Viewing History Ranges

查看历史范围

Using the -r option to alembic history, we can also view various slices of history. The -r argument accepts an argument [start]:[end], where either may be a revision number, symbols like head, heads or base, current to specify the current revision(s), as well as negative relative ranges for [start] and positive relative ranges for [end]:

使用 alembic history 的 -r 选项，我们还可以查看历史片段。 -r 参数接受一个参数 [start]:[end]，其中可以是一个修订号，像 head、heads 或 base、current 这样的符号来指定当前的修订版本，以及[start] 的负相对范围和[end] 的正相对范围：

alembic history -r1975ea:ae1027

A relative range starting from three revisions ago up to current migration, which will invoke the migration environment against the database to get the current migration:

从前三个修订版本到当前迁移版本的相对范围，它将针对数据库调用迁移环境以获取当前迁移：

alembic history -r-3:current

View all revisions from 1975 to the head:

查看从1975到head的所有修订：

alembic history -r1975ea: