10 Dec
2018
10 Dec
'18
10:06 a.m.
On Mon, Dec 10, 2018 at 03:46:46PM +0100, Damien Mattei wrote:
query returns a list i suppose because i can wirte this in my main code: bd_rows <- query conn qry_head (Only (name::String))
`query` does not return a `[r]`, rather an `IO [r]`. The difference is very important; if you don't get it you will always have troubles with Haskell. This will for sure help you https://www.seas.upenn.edu/~cis194/fall16/lectures/06-io-and-monads.html