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Rails – Active record

December 28, 2010

Rails uses ORM ( Object Relational Mapping)

usually we connect the database using the queries with in the quote through the languages.

queries are slightly different to various databases like Oracle, MySql, etc., in this case doesn’t change database one to another

if wants means change all queries as per the databases.

but Rails provide active_record concept . It is an Domain Specific language

we connect the database via rails not use the DB queries. so we can easily change various databases.

Mr. Thayagarajan explained the comparisons of usual way and active_record(rails)

active_record example:


require 'rubygems'

require 'active_record'

ActiveRecord::Base.establish_connection(:adapter => "mysql",:host => "localhost",:username => "root",:password => "password",:database => "rubyclass")

class Student < ActiveRecord::Base

belongs_to :standard

end

class Standard <  ActiveRecord::Base

has_many :students

end

all_students = Student.find(:all)
all_students.each do |child|

puts child.name + child.standard.name

end

Rails installation in tamil:

 http://coachfactory.blogspot.com/2010/07/blog-post.html

 

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