2010/12/27 いとうかつとし :

Hi I'm planning store files (ie. images, excel ...) into database. how to write this?

Just use a ByteString as your data type! =) For example: import Yesod import Data.ByteString (ByteString) import Database.Persist.Base import Database.Persist.TH (share2) import Database.Persist.GenericSql (mkMigrate) share2 mkPersist (mkMigrate "migrateAll") [$persist| User ident String password String photo ByteString |] Hope that helps, -- Felipe.