How can execute multiple statements in one query with Rails?

I am using Ruby on Rails with ActiveRecord and PostgreSQL.

How can i execute multiple sql queries?

I need it for running a custom migration script, eg:

Foo.connection.execute <<-SQL.split(';').map(&:strip).join
 delete from metadata where record_type = 'Foo';
 TRUNCATE table1 RESTART IDENTITY;
 TRUNCATE table2 RESTART IDENTITY;
 delete from schema_migrations where version > '20120806120823';
SQL

I am not accepting data from a user, so I'm not worried about sql-injection.

Something like CLIENT_MULTI_STATEMENTS in MySQL maybe ?

From the MySQL/PHP docs:

CLIENT_MULTI_STATEMENTS: Tell the server that the client may send multiple statements in a single string (separated by “;”). If this flag is not set, multiple-statement execution is disabled. See the note following this table for more information about this flag.