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February 13, 2017 01:20
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persistent-mysql example
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{-# LANGUAGE OverloadedStrings #-} | |
module Main where | |
import Types | |
import Database.Persist.MySQL | |
import Control.Monad.Logger | |
import Control.Monad.IO.Class | |
printIO :: (MonadIO m, Show a) => a -> m () | |
printIO = liftIO . print | |
createGame :: MonadIO m => BoardGame -> SqlPersistT m (Entity BoardGame) | |
createGame = insertEntity | |
readGame :: MonadIO m => Int -> SqlPersistT m (Maybe BoardGame) | |
readGame = get . toSqlKey . fromIntegral | |
connectInfo :: ConnectInfo | |
connectInfo = defaultConnectInfo | |
{ connectDatabase = "board_games" | |
} | |
main :: IO () | |
main = | |
runStdoutLoggingT | |
. withMySQLPool connectInfo 3 | |
. runSqlPool | |
$ do | |
result <- createGame $ BoardGame | |
"Cosmic Encounter" | |
"Bill Eberle" | |
(Just 2008) | |
liftIO $ print result | |
-- This is the easiest way to re-read a record: | |
get (entityKey result) >>= printIO | |
-- Getting by id | |
readGame 1 >>= printIO | |
-- Get by name too: | |
getBy (UniqueName "Cosmic Encounter") >>= printIO | |
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