Le 05/12/2018 17:12, Francesco Ariis a écrit :
Hello Damien,
On Wed, Dec 05, 2018 at 05:02:48PM +0100, Damien Mattei wrote:
• Couldn't match expected type ‘Query’ with actual type ‘[Char]’
GHC would like to have a `Query`, but you are providing a `String`. You didn't specify which library you are using, but I am willing to bet there is an appropriate ":: String -> Query" function.
That of you need to put
{-# Language OverloadedStrings -#}
i had put it alreeady
on top of your file. Does that work?
no i begin to understand that {-# Language OverloadedStrings -#} is working on string but not on string in variable or concatenation , i should have to create an object of type Query from the String... ??? finally ,having a beginning of solution: let qry_head = "select `N° BD` from sidonie.Coordonnées where Nom = ?" :: Query putStrLn qry bd_rows <- query conn qry_head (Only (name::String))
-F
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-- Damien.Mattei@unice.fr, Damien.Mattei@oca.eu, UNS / OCA / CNRS