Hello Daniel and all, Your suggestion #1 : Can't import Database.HDBC.MySQL.Connection :
da...@pcdavid2:~/projets/haskell/caimonitor$ ghci -Wall Bdd.hs GHCi, version 6.10.3: http://www.haskell.org/ghc/ :? for help Loading package ghc-prim ... linking ... done. Loading package integer ... linking ... done. Loading package base ... linking ... done. Bdd.hs:15:7: Could not find module `Database.HDBC.MySQL.Connection': it is a hidden module in the package `HDBC-mysql-0.6' Use -v to see a list of the files searched for. Failed, modules loaded: none. Prelude> Leaving GHCi. Your suggestion #2 : Unfortunately, the type isn't exported, as it seems : The doc says : *This module provides a MySQL driver for the HDBC database interface. To use it, invoke the 'connectMySQL' method to create an @Database.HDBC.IConnection@ that you can use to interact with a MySQL database. Use the 'defaultMySQLConnectInfo', overriding the default values as necessary.* so I tried : connecter :: IO IConnection connecter = connectMySQL mysqlInfo But then that didn't work too, because IConnection is a class, not a type ( which is not obvious from the documentation snippet I read) So then I tried : connecter :: IConnection conn => conn connecter = connectMySQL mysqlInfo And even though I suspect that's the correct type, it fails too : da...@pcdavid2:~/projets/haskell/caimonitor$ ghci -Wall Bdd.hs GHCi, version 6.10.3: http://www.haskell.org/ghc/ :? for help Loading package ghc-prim ... linking ... done. Loading package integer ... linking ... done. Loading package base ... linking ... done. [2 of 2] Compiling Bdd ( Bdd.hs, interpreted ) Bdd.hs:27:12: Couldn't match expected type `conn' against inferred type `HDBC-mysql-0.6:Database.HDBC.MySQL.Connection.Connection' `conn' is a rigid type variable bound by the type signature for `connecter' at Bdd.hs:26:25 Expected type: IO conn Inferred type: IO HDBC-mysql-0.6:Database.HDBC.MySQL.Connection.Connection In the expression: connectMySQL mysqlInfo In the definition of `connecter': connecter = connectMySQL mysqlInfo I looked at Connection.hsc from the library and the Connection type defined there isn't exported. For now, I've disabled that type of warnings. Thanks, David.
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