module Database.Selda.SQLite (withSQLite) where
import Database.Selda
import Database.Selda.Backend
import Data.Text (pack)
import Control.Monad.Catch
import Control.Concurrent
#ifndef __HASTE__
import Database.SQLite3
import System.Directory (makeAbsolute)
#endif
withSQLite :: (MonadIO m, MonadMask m) => FilePath -> SeldaT m a -> m a
#ifdef __HASTE__
withSQLite _ _ = return $ error "withSQLite called in JS context"
#else
withSQLite file m = do
lock <- liftIO $ newMVar ()
edb <- try $ liftIO $ open (pack file)
case edb of
Left e@(SQLError{}) -> do
throwM (DbError (show e))
Right db -> do
absFile <- liftIO $ makeAbsolute file
let backend = sqliteBackend lock absFile db
liftIO $ runStmt backend "PRAGMA foreign_keys = ON;" []
runSeldaT m backend `finally` liftIO (close db)
sqliteBackend :: MVar () -> FilePath -> Database -> SeldaBackend
sqliteBackend lock dbfile db = SeldaBackend
{ runStmt = \q ps -> snd <$> sqliteQueryRunner lock db q ps
, runStmtWithPK = \q ps -> fst <$> sqliteQueryRunner lock db q ps
, customColType = \_ _ -> Nothing
, defaultKeyword = "NULL"
, dbIdentifier = pack dbfile
}
sqliteQueryRunner :: MVar () -> Database -> QueryRunner (Int, (Int, [[SqlValue]]))
sqliteQueryRunner lock db qry params = do
eres <- try $ do
stm <- prepare db qry
takeMVar lock
go stm `finally` do
putMVar lock ()
finalize stm
case eres of
Left e@(SQLError{}) -> throwM (SqlError (show e))
Right res -> return res
where
go stm = do
bind stm [toSqlData p | Param p <- params]
rows <- getRows stm []
rid <- lastInsertRowId db
cs <- changes db
return (fromIntegral rid, (cs, [map fromSqlData r | r <- rows]))
getRows s acc = do
res <- step s
case res of
Row -> do
cs <- columns s
getRows s (cs : acc)
_ -> do
return $ reverse acc
toSqlData :: Lit a -> SQLData
toSqlData (LInt i) = SQLInteger $ fromIntegral i
toSqlData (LDouble d) = SQLFloat d
toSqlData (LText s) = SQLText s
toSqlData (LDateTime s) = SQLText s
toSqlData (LDate s) = SQLText s
toSqlData (LTime s) = SQLText s
toSqlData (LBool b) = SQLInteger $ if b then 1 else 0
toSqlData (LNull) = SQLNull
toSqlData (LJust x) = toSqlData x
toSqlData (LCustom l) = toSqlData l
fromSqlData :: SQLData -> SqlValue
fromSqlData (SQLInteger i) = SqlInt $ fromIntegral i
fromSqlData (SQLFloat f) = SqlFloat f
fromSqlData (SQLText s) = SqlString s
fromSqlData (SQLBlob _) = error "BUG: SQLite returned BLOB"
fromSqlData SQLNull = SqlNull
#endif