Sequel version 0.1.6 has just been released. New in this release is
support for literal expressions, Dataset#or and Dataset#and, and the
default join type is INNER JOIN. Various bug fixes courtesy of snok.
Sequel is a lightweight ORM library for Ruby. Sequel provides thread
safety, connection pooling and a concise DSL for constructing database
queries and table schemas.
Literal expressions
You can now use literal expressions in filters or update values:
items.update_sql(:col2 => ‘col1 + 10’.expr) #=>
“UPDATE items SET col2 = col1 + 10”
items.exclude {col1 > ‘col2 + col3’.expr}.sql #=>
“SELECT * FROM items WHERE NOT (col1 > col2 + col3)”
Dataset#or, #and
Pretty much self-explanatory:
items.filter {col1 > 100}.or(:col2 => nil).sql #=>
“SELECT * FROM items WHERE (col1 > 100) OR (col2 IS NULL)”
items.filter {col1 > 100}.and(:col2 => nil).sql #=>
“SELECT * FROM items WHERE (col1 > 100) AND (col2 IS NULL)”
Default join type
On advice from a dude named snok, I changed the default join type to
INNER, since that’s what the SQL specs say. So now:
DB[:a].join(:b, :a_id).sql #=>
“SELECT * FROM a INNER JOIN b ON (b.a_id = a.id)”
SQLite Memory DB
The SQLite adapter always had support for memory DB’s:
Sequel.open ‘sqlite:/:memory:’
Well, now it’s even easier. Just omit the db name altogether:
Sequel.open ‘sqlite:/’
Miscelenea
-
Removed stub class methods from Model. Model.method_missing now
automagically creates stub methods as needed. This is the first step
on the way to turning the model class into a supercharged dataset, but
that’s a topic for a separate post. Coming soon…
-
Fixed PrettyTable code so now model datasets can be printed just
like naked datasets (thanks snok). -
Fixed Model#method_missing to raise if an unknown attribute is
accessed. Up until now this was the cause for a lot of potential
hidden errors, as unintended method calls would be swallowed and
ignored. -
Fixed ODBC timestamp conversion to support dates before 1970 and
after 2040 (thanks snok.)
======================
Sequel documentation:
http://sequel.rubyforge.org
Join the Sequel-talk group:
http://groups.google.com/group/sequel-talk
Install the gem:
sudo gem install sequel
Or check out the source and install manually:
svn co http://ruby-sequel.googlecode.com/svn/trunk sequel
cd sequel
rake install