DbCompile

Adds rake db:compile to your rails project tasks. This task can be used to compile views, functions, triggers, and more!

Install

script/plugin install git://github.com/redhatcat/dbcompile.git

Setup

Configuration is contained in one file, RAILS_ROOT/db/compile.yml. In here, you describe the statement and dependencies. You can fine an example with comments here.

The SQL scripts themselves are places in several directories under RAILS_ROOT/db.

• RAILS_ROOT/db/functions contains function scripts.
• RAILS_ROOT/db/triggers contains trigger scripts.
• RAILS_ROOT/db/views contains view scripts.

All of these scripts, with the exception of views, should be self replacing, e.g. you will want to use statements like CREATE OR REPLACE FUNCTION.

Note on views: View scripts should be written as everything after the AS keyword, i.e. write views as SELECTs. DbCompile will magically wrap the SELECT with CREATE OR REPLACE VIEW #script_name AS #sql_source.

Adding new SQL constructs

If you want something beyond a function, trigger, or view, DbCompile is easy to extend. Simply create a new class that extends DbCompile::Construct and require it in lib/dbcompile/transaction.rb. See the source of lib/dbcompile/view.rb and lib/dbcompile/construct.rb for reference.

How the dependencies work

The dependencies of a contruct determine the order of (re)creation. The consequences of not stating dependencies in the case of a view:

• A view may fail being created entirely.
• A view may be created, then deleted by DROP CASCADE of another view it depends on.