使用Liquibase从MySQL表中拆分列

Question

I have an existing table with data in it.

foobar_table
    foo
    bar
    baz

I want to split the baz column out of the foobar_table table and create a new table called baz_table that contains it. After the operation is done I would have the following structure with each column containing the data it had before the operation started:

foobar_table
    foo
    bar

baz_table
    baz

How can I do this with Liquibase ?

PS Using Liquibase via the Grails Database Migration plugin . The grailsChange tag gives me hope, but lack of example documentation leave me wanting.

Update:

I wasn't aware of the sql that can be used in change sets. I found out about it in the example here and I think it is what I needed.

Answer 1

As you already found out, you can run arbitary SQL queries as a part of changeset. I go over common caveats in my blog post .

So for your example:

<changeset>
  <createTable tableName="baz_table"/>
  <sql>insert into baz_table(baz) select baz from foobar</sql>
  <dropColumn tableName="foobar_table" columName="baz"/>
</changeset>