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体验新版 GitCode,发现更多精彩内容 >>
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dcda6e32
编写于
3月 26, 2014
作者:
Y
Yves Senn
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link to "Schema migration" Wikipedia page. Closes #14479. [ci skip]
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guides/source/migrations.md
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@@ -18,9 +18,10 @@ After reading this guide, you will know:
...
@@ -18,9 +18,10 @@ After reading this guide, you will know:
Migration Overview
Migration Overview
------------------
------------------
Migrations are a convenient way to alter your database schema over time in a
Migrations are a convenient way to
consistent and easy way. They use a Ruby DSL so that you don't have to write
[
alter your database schema over time
](
http://en.wikipedia.org/wiki/Schema_migration
)
SQL by hand, allowing your schema and changes to be database independent.
in a consistent and easy way. They use a Ruby DSL so that you don't have to
write SQL by hand, allowing your schema and changes to be database independent.
You can think of each migration as being a new 'version' of the database. A
You can think of each migration as being a new 'version' of the database. A
schema starts off with nothing in it, and each migration modifies it to add or
schema starts off with nothing in it, and each migration modifies it to add or
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