45 lines
1.7 KiB
Haskell
45 lines
1.7 KiB
Haskell
{-# LANGUAGE OverloadedStrings, ExtendedDefaultRules #-}
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import Database.MongoDB (Action, Document, Document, Value, access,
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close, connect, delete, exclude, find,
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host, insertMany, master, project, rest,
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runIOE, select, sort, (=:))
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import Control.Monad.Trans (liftIO)
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main :: IO ()
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main = do
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pipe <- runIOE $ connect (host "127.0.0.1")
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e <- access pipe master "baseball" run
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close pipe
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print e
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run :: Action IO ()
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run = do
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clearTeams
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insertTeams
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allTeams >>= printDocs "All Teams"
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nationalLeagueTeams >>= printDocs "National League Teams"
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newYorkTeams >>= printDocs "New York Teams"
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clearTeams :: Action IO ()
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clearTeams = delete (select [] "team")
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insertTeams :: Action IO [Value]
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insertTeams = insertMany "team" [
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["name" =: "Yankees", "home" =: ["city" =: "New York", "state" =: "NY"], "league" =: "American"],
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["name" =: "Mets", "home" =: ["city" =: "New York", "state" =: "NY"], "league" =: "National"],
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["name" =: "Phillies", "home" =: ["city" =: "Philadelphia", "state" =: "PA"], "league" =: "National"],
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["name" =: "Red Sox", "home" =: ["city" =: "Boston", "state" =: "MA"], "league" =: "American"] ]
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allTeams :: Action IO [Document]
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allTeams = rest =<< find (select [] "team") {sort = ["home.city" =: 1]}
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nationalLeagueTeams :: Action IO [Document]
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nationalLeagueTeams = rest =<< find (select ["league" =: "National"] "team")
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newYorkTeams :: Action IO [Document]
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newYorkTeams = rest =<< find (select ["home.state" =: "NY"] "team") {project = ["name" =: 1, "league" =: 1]}
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printDocs :: String -> [Document] -> Action IO ()
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printDocs title docs = liftIO $ putStrLn title >> mapM_ (print . exclude ["_id"]) docs
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