sql select order by specific order

select * from tablename
Where id in (15,12,34,44,2)
Order by (Case When id = 15 then 0
When id = 12 then 1
When id = 34 then 2
When id = 44 then 3
When id = 2 then 4 Else id End)

Php and MySql Book

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http://books.google.com/books?hl=en&id=fGzifMim4qYC&dq=php+and+mysql+web+development&printsec=frontcover&source=web&ots=mB9GW-2nJ3&sig=9LQvdcdH8x_AuTRkl4yomObJ4vc&sa=X&oi=book_result&resnum=1&ct=result#PPP12,M1