Commit 52e670969d09194475b875c9dc52db09e84c6cd7 - tansu-sqlite3

+66

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Database/Tansu/Backend/SQLite3.hs less more

	1	{-# LANGUAGE OverloadedStrings #-}
	2
	3	module Database.Tansu.Backend.SQLite3 where
	4
	5	import Control.Monad (when, void)
	6	import Data.ByteString (ByteString)
	7	import Data.Text (Text)
	8	import qualified Data.Text as T
	9	import Database.SQLite3
	10	import Database.Tansu.Internal
	11	import System.Directory (doesFileExist)
	12
	13	schema :: Text
	14	schema = "CREATE TABLE tansu ( k blob primary key not null \
	15	\ , v blob not null );"
	16
	17	sqlset :: Database -> ByteString -> ByteString -> IO (Either TansuError ())
	18	sqlset db k v = do
	19	stmt <- prepare db "INSERT INTO tansu (k, v) VALUES (:k, :v);"
	20	bindNamed stmt [ (":k", SQLBlob k)
	21	, (":v", SQLBlob v)
	22	]
	23	void (step stmt)
	24	finalize stmt
	25	return (return ())
	26
	27	sqlget :: Database -> ByteString -> IO (Either TansuError ByteString)
	28	sqlget db k = do
	29	stmt <- prepare db "SELECT v FROM tansu WHERE k = :k;"
	30	bindNamed stmt [ (":k", SQLBlob k) ]
	31	void (step stmt)
	32	cs <- columns stmt
	33	finalize stmt
	34	case cs of
	35	[SQLBlob v] -> return (Right v)
	36	[SQLNull] -> return (Left (KeyNotFound k))
	37	rs -> return (Left (OtherError (show rs)))
	38
	39	sqldel :: Database -> ByteString -> IO (Either TansuError ())
	40	sqldel db k = do
	41	stmt <- prepare db "DELETE FROM tansu WHERE k = :k;"
	42	bindNamed stmt [ (":k", SQLBlob k) ]
	43	void (step stmt)
	44	finalize stmt
	45	return (Right ())
	46
	47	sqltransact :: Database -> IO a -> IO a
	48	sqltransact db mote = do
	49	exec db "BEGIN TRANSACTION;"
	50	result <- mote
	51	exec db "END TRANSACTION;"
	52	return result
	53
	54	withSQLiteDb :: FilePath -> (TansuDb k v -> IO a) -> IO a
	55	withSQLiteDb path mote = do
	56	exists <- doesFileExist path
	57	conn <- open (T.pack path)
	58	when (not exists) $ do
	59	exec conn schema
	60	result <- mote $ TansuDb { dbGet = sqlget conn
	61	, dbSet = sqlset conn
	62	, dbDel = sqldel conn
	63	, dbRunTransaction = id
	64	}
	65	close conn
	66	return result

+30

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LICENSE less more

	1	Copyright (c) 2016, Getty Ritter
	2
	3	All rights reserved.
	4
	5	Redistribution and use in source and binary forms, with or without
	6	modification, are permitted provided that the following conditions are met:
	7
	8	* Redistributions of source code must retain the above copyright
	9	notice, this list of conditions and the following disclaimer.
	10
	11	* Redistributions in binary form must reproduce the above
	12	copyright notice, this list of conditions and the following
	13	disclaimer in the documentation and/or other materials provided
	14	with the distribution.
	15
	16	* Neither the name of Getty Ritter nor the names of other
	17	contributors may be used to endorse or promote products derived
	18	from this software without specific prior written permission.
	19
	20	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	21	"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	22	LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	23	A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	24	OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	25	SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	26	LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	27	DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	28	THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	29	(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	30	OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

+2

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Setup.hs less more

	1	import Distribution.Simple
	2	main = defaultMain

+26

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sample/Main.hs less more

	1	module Main where
	2
	3	import Control.Monad (void)
	4	import Database.Tansu
	5	import Database.Tansu.Backend.SQLite3
	6
	7	main :: IO ()
	8	main = void $ withSQLiteDb "sample.db" $ \ db -> do
	9	putStrLn "Populating test database"
	10	run db $ do
	11	"one" =: "un"
	12	"two" =: "du"
	13	"three" =: "tri"
	14	"four" =: "kvar"
	15
	16	putStr "looking up key 'three': "
	17	rs <- run db $ get "three"
	18	case rs of
	19	Right val -> putStrLn val
	20	Left _ -> putStrLn "...not in the database."
	21
	22	putStr "looking up key 'five': "
	23	rs <- run db $ get "five"
	24	case rs of
	25	Right val -> putStrLn val
	26	Left _ -> putStrLn "...not in the database."

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tansu-sqlite3.cabal less more

	1	name: tansu-sqlite3
	2	version: 0.1.0.0
	3	-- synopsis:
	4	-- description:
	5	license: BSD3
	6	license-file: LICENSE
	7	author: Getty Ritter
	8	maintainer: gdritter@galois.com
	9	copyright: 2015 Getty Ritter
	10	category: Database
	11	build-type: Simple
	12	cabal-version: >=1.10
	13
	14	library
	15	exposed-modules: Database.Tansu.Backend.SQLite3
	16	build-depends: base >=4.8 && <4.9,
	17	tansu,
	18	bytestring,
	19	text,
	20	directory,
	21	direct-sqlite
	22	default-language: Haskell2010
	23
	24	executable sample
	25	main-is: Main.hs
	26	build-depends: base, tansu, tansu-sqlite3
	27	hs-source-dirs: sample
	28	default-language: Haskell2010