Ruby on Rails

Hi,
Just yesterday I successfully installed ruby in my pc, means I am
new in this technology.
Today I am trying to fetch the data in my ruby application and
successfully done this. Now I want to speed up the performance of the
fetching data by making use of prepare and execute method.In case of
select query also I am using this like

require 'mysql'
mysql = Mysql.init()
mysql.connect('localhost','root','','ruby')
selection = mysql.prepare("select * from test where id=?")
result = selection.execute(2)
while row = result.fetch_hash do
puts "The name is: #{row['name']}"
end
mysql.close();

So when I run this small part of the application I am getting the
following error:
in `<top (required)>': undefined method `fetch_hash' for
#<Mysql::Stmt:0xf9d128> (NoMethodError)
from -e:1:in `load'
from -e:1:in `<main>'

But if we write code like:
require 'mysql'
mysql = Mysql.init()
mysql.connect('localhost','root','','ruby')
result = mysql.query("select * from test where id=2")
while row = result.fetch_hash do
puts "The name is: #{row['name']}"
end
mysql.close();

then my application is running without error.

Now my question is, if we try to fetch the data by making use of prepare
and execute method then what will be the available methods for showing
the records?

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