gdritter repos tansu-berkeleydb / 28f58b7
Mostly-working but sans transaction BerkeleyDb backend Getty Ritter 8 years ago
5 changed file(s) with 763 addition(s) and 0 deletion(s). Collapse all Expand all
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Database/Tansu/Backend/BerkeleyDb.hs less more
1 module Database.Tansu.Backend.BerkeleyDb where
2
3 import Database.Berkeley.Db
4 import Data.ByteString (ByteString)
5 import System.Directory (createDirectoryIfMissing)
6
7 import Database.Tansu.Internal (Database(..))
8
9 bdbSet :: Db -> ByteString -> ByteString -> IO ()
10 bdbSet db key val =
11 db_put [] db Nothing key val
12
13 bdbGet :: Db -> ByteString -> IO (Maybe ByteString)
14 bdbGet db key =
15 db_get [] db Nothing key
16
17 withBerkeleyDb :: FilePath -> (Database -> IO a) -> IO a
18 withBerkeleyDb path comp = do
19 createDirectoryIfMissing True path
20 env <- dbEnv_create []
21 dbEnv_open [DB_CREATE,DB_INIT_MPOOL,DB_INIT_TXN] 0 env path
22 db <- db_create [] env
23 db_open [DB_CREATE] DB_HASH 0 db Nothing path Nothing
24 result <- comp $ Database { dbGet = bdbGet db
25 , dbSet = bdbSet db
26 , dbRunTransaction = id
27 }
28 db_close [] db
29 dbEnv_close [] env
30 return result
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597 IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
598 ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
599
600 16. Limitation of Liability.
601
602 IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
603 WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
604 THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
605 GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
606 USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
607 DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
608 PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
609 EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
610 SUCH DAMAGES.
611
612 17. Interpretation of Sections 15 and 16.
613
614 If the disclaimer of warranty and limitation of liability provided
615 above cannot be given local legal effect according to their terms,
616 reviewing courts shall apply local law that most closely approximates
617 an absolute waiver of all civil liability in connection with the
618 Program, unless a warranty or assumption of liability accompanies a
619 copy of the Program in return for a fee.
620
621 END OF TERMS AND CONDITIONS
622
623 How to Apply These Terms to Your New Programs
624
625 If you develop a new program, and you want it to be of the greatest
626 possible use to the public, the best way to achieve this is to make it
627 free software which everyone can redistribute and change under these terms.
628
629 To do so, attach the following notices to the program. It is safest
630 to attach them to the start of each source file to most effectively
631 state the exclusion of warranty; and each file should have at least
632 the "copyright" line and a pointer to where the full notice is found.
633
634 <one line to give the program's name and a brief idea of what it does.>
635 Copyright (C) <year> <name of author>
636
637 This program is free software: you can redistribute it and/or modify
638 it under the terms of the GNU General Public License as published by
639 the Free Software Foundation, either version 3 of the License, or
640 (at your option) any later version.
641
642 This program is distributed in the hope that it will be useful,
643 but WITHOUT ANY WARRANTY; without even the implied warranty of
644 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
645 GNU General Public License for more details.
646
647 You should have received a copy of the GNU General Public License
648 along with this program. If not, see <http://www.gnu.org/licenses/>.
649
650 Also add information on how to contact you by electronic and paper mail.
651
652 If the program does terminal interaction, make it output a short
653 notice like this when it starts in an interactive mode:
654
655 <program> Copyright (C) <year> <name of author>
656 This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
657 This is free software, and you are welcome to redistribute it
658 under certain conditions; type `show c' for details.
659
660 The hypothetical commands `show w' and `show c' should show the appropriate
661 parts of the General Public License. Of course, your program's commands
662 might be different; for a GUI interface, you would use an "about box".
663
664 You should also get your employer (if you work as a programmer) or school,
665 if any, to sign a "copyright disclaimer" for the program, if necessary.
666 For more information on this, and how to apply and follow the GNU GPL, see
667 <http://www.gnu.org/licenses/>.
668
669 The GNU General Public License does not permit incorporating your program
670 into proprietary programs. If your program is a subroutine library, you
671 may consider it more useful to permit linking proprietary applications with
672 the library. If this is what you want to do, use the GNU Lesser General
673 Public License instead of this License. But first, please read
674 <http://www.gnu.org/philosophy/why-not-lgpl.html>.
+2
-0
Setup.hs less more
1 import Distribution.Simple
2 main = defaultMain
+26
-0
sample/Main.hs less more
1 module Main where
2
3 import Control.Monad (void)
4 import Database.Tansu
5 import Database.Tansu.Backend.BerkeleyDb
6
7 main :: IO ()
8 main = void $ withBerkeleyDb "sampledb" $ \ 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."
+31
-0
tansu-berkeleydb.cabal less more
1 name: tansu-berkeleydb
2 version: 0.1.0.0
3 -- synopsis:
4 -- description:
5 license: GPL-3
6 license-file: LICENSE
7 author: Getty Ritter
8 maintainer: gettylefou@gmail.com
9 -- copyright:
10 category: Database
11 build-type: Simple
12 extra-source-files: ChangeLog.md
13 cabal-version: >=1.10
14
15 library
16 exposed-modules: Database.Tansu.Backend.BerkeleyDb
17 -- other-modules:
18 -- other-extensions:
19 build-depends: base >=4.8 && <4.9,
20 bytestring >=0.10 && <0.11,
21 directory >=1.2 && <1.3,
22 tansu,
23 BerkeleyDB
24 -- hs-source-dirs:
25 default-language: Haskell2010
26
27 executable sample
28 main-is: Main.hs
29 build-depends: base, tansu, tansu-berkeleydb
30 hs-source-dirs: sample
31 default-language: Haskell2010