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体验新版 GitCode,发现更多精彩内容 >>
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e2648c42
编写于
4月 19, 2017
作者:
V
vishalzambre
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guides/source/active_record_migrations.md
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@@ -972,11 +972,11 @@ on. Because this is database-independent, it could be loaded into any database
that Active Record supports. This could be very useful if you were to
distribute an application that is able to run against multiple databases.
There is however a trade-off:
`db/schema.rb`
cannot express database specific
items such as triggers, stored procedures or check constraints. While in a
migration you can execute custom SQL statements, the schema dumper cannot
reconstitute those statements from the database. If you are using features like
this, then you
should set the schema format to
`:sql`
.
NOTE:
`db/schema.rb`
cannot express database specific items such as triggers,
sequences, stored procedures or check constraints, etc. While in a migration you
can execute custom SQL statements, the schema dumper cannot reconstitute those
statements from the database. If you are using features like this, then you
should set the schema format to
`:sql`
.
Instead of using Active Record's schema dumper, the database's structure will
be dumped using a tool specific to the database (via the
`db:structure:dump`
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