PostgreSQL (empty) → 0.1
raw patch · 6 files changed
+627/−0 lines, 6 filesdep +basedep +mtlbuild-type:Customsetup-changed
Dependencies added: base, mtl
Files
- BSD3 +26/−0
- COPYING +6/−0
- Database/PostgreSQL.hsc +222/−0
- GPL-2 +340/−0
- PostgreSQL.cabal +25/−0
- Setup.hs +8/−0
+ BSD3 view
@@ -0,0 +1,26 @@+Copyright (c) Ian Lynagh.+All rights reserved.++Redistribution and use in source and binary forms, with or without+modification, are permitted provided that the following conditions+are met:+1. Redistributions of source code must retain the above copyright+ notice, this list of conditions and the following disclaimer.+2. Redistributions in binary form must reproduce the above copyright+ notice, this list of conditions and the following disclaimer in the+ documentation and/or other materials provided with the distribution.+3. The names of the author may not be used to endorse or promote+ products derived from this software without specific prior written+ permission.++THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE+ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS+OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)+HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT+LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY+OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF+SUCH DAMAGE.
+ COPYING view
@@ -0,0 +1,6 @@++Copyright (c) Ian Lynagh, 2006, 2007.++This package can be used under either the GPL v2, as in ./GPL-2, or the+3-clause BSD, as in ./BSD3, license.+
+ Database/PostgreSQL.hsc view
@@ -0,0 +1,222 @@++module Database.PostgreSQL where++import Control.Monad.Error+import Control.Monad.State+import Control.Monad.Trans+import Data.List+import Data.Maybe+import Foreign+import Foreign.C++#include <libpq-fe.h>++-- Generic stuff++newtype DatabaseT m a = DatabaseT (StateT DatabaseHandle m a)+ deriving (Monad, MonadIO, MonadTrans)++class (MonadIO m, Error e, MonadError e m)+ => MonadDatabase e m where+ getConnection :: m DatabaseHandle++instance (MonadIO m, Error e, MonadError e m)+ => MonadDatabase e (DatabaseT m) where+ getConnection = DatabaseT get++instance (MonadIO (t m), MonadError e (t m), MonadTrans t,+ MonadDatabase e m, Monad (t m))+ => MonadDatabase e (t m) where+ getConnection = lift getConnection++instance MonadError e m => MonadError e (DatabaseT m) where+ throwError x = DatabaseT (throwError x)+ catchError (DatabaseT f) g = DatabaseT+ $ catchError f (\x -> case g x of+ DatabaseT y -> y)++-- Postgres stuff++data PGconn+newtype DatabaseHandle = DatabaseHandle (Ptr PGconn)++foreign import ccall unsafe "static libpq-fe.h PQconnectdb"+ pqConnectDB :: CString -> IO (Ptr PGconn)++type ConnStatusType = #type ConnStatusType+-- XXX Incomplete list:+connection_OK :: ConnStatusType+connection_OK = #const CONNECTION_OK+connection_bad :: ConnStatusType+connection_bad = #const CONNECTION_BAD+foreign import ccall unsafe "static libpq-fe.h PQstatus"+ pqStatus :: Ptr PGconn -> IO ConnStatusType++foreign import ccall unsafe "static libpq-fe.h PQerrorMessage"+ pqErrorMessage :: Ptr PGconn -> IO CString++data PGresult++foreign import ccall unsafe "static libpq-fe.h PQexec"+ pqExec :: Ptr PGconn -> CString -> IO (Ptr PGresult)++execute :: MonadDatabase e m => String -> m ()+execute sql = do DatabaseHandle dbh <- getConnection+ checkResultStatus "execute" $ withCString sql $ pqExec dbh++type Oid = #type Oid++withCStrings :: [String] -> (Ptr CString -> IO a) -> IO a+withCStrings all_xs f = go [] all_xs+ where go acc [] = withArray (reverse acc) f+ go acc (x:xs) = withCString x $ \s -> go (s:acc) xs++foreign import ccall unsafe "static libpq-fe.h PQexecParams"+ pqExecParams :: Ptr PGconn -- Connection+ -> CString -- command+ -> CInt -- nParams+ -> Ptr Oid -- paramTypes+ -> Ptr CString -- paramValues+ -> Ptr CInt -- paramLengths+ -> Ptr CInt -- paramFormats+ -> CInt -- resultFormat+ -> IO (Ptr PGresult)+execParams :: MonadDatabase e m => String -> [String] -> m ()+execParams sql params+ = do let nparams = genericLength params+ -- We don't currently let the user tell us which Oid they want+ -- to use+ oids = nullPtr+ -- XXX We should really use binary mode, in which case we'd+ -- need to give lengths, but for now we are using text mode,+ -- so we don't+ lengths = nullPtr+ DatabaseHandle dbh <- getConnection+ checkResultStatus "execParams" $+ withCString sql $ \sql' ->+ withCStrings params $ \params' ->+ -- XXX For now we use text mode (0), but we really ought to+ -- use binary+ withArray (genericReplicate nparams 0) $ \formats ->+ -- XXX Again, should use binary (1) rather than text (0)+ pqExecParams dbh sql' nparams oids params' lengths formats 0++-- Docs in http://www.postgresql.org/docs/7.4/interactive/libpq-exec.html+-- PGresult *PQexecPrepared(PGconn *conn,+-- const char *stmtName,+-- int nParams,+-- const char * const *paramValues,+-- const int *paramLengths,+-- const int *paramFormats,+-- int resultFormat);+-- Uses statements created with an SQL "PREPARE" command++type ExecStatusType = #type ExecStatusType+-- XXX Incomplete list:+pgres_empty_query :: ExecStatusType+pgres_empty_query = #const PGRES_EMPTY_QUERY+pgres_command_OK :: ExecStatusType+pgres_command_OK = #const PGRES_COMMAND_OK+-- can be 0 rows:+pgres_tuples_OK :: ExecStatusType+pgres_tuples_OK = #const PGRES_TUPLES_OK+foreign import ccall unsafe "static libpq-fe.h PQresultStatus"+ pqResultStatus :: Ptr PGresult -> IO ExecStatusType+-- PGRES_COPY_OUT+-- PGRES_COPY_IN+-- PGRES_BAD_RESPONSE+-- PGRES_NONFATAL_ERROR (not returned directly XXX)+-- PGRES_FATAL_ERROR (null equiv to this)++foreign import ccall unsafe "static libpq-fe.h PQresStatus"+ pqResStatus :: ExecStatusType -> IO CString++foreign import ccall unsafe "static libpq-fe.h PQresultErrorMessage"+ pqResultErrorMessage :: Ptr PGresult -> IO CString++checkResultStatus :: MonadDatabase e m => String -> IO (Ptr PGresult) -> m ()+checkResultStatus s f+ = do res <- liftIO f+ res' <- liftIO $ pqResultStatus res+ when (res' `notElem` [pgres_command_OK, pgres_tuples_OK]) $ do+ err_msg <- liftIO $ pqResultErrorMessage res >>= peekCString+ err_code <- liftIO $ pqResStatus res' >>= peekCString+ let err = s ++ " failed (" ++ err_code ++ "): " ++ err_msg+ throwError $ strMsg err++-- char *PQresultErrorMessage(const PGresult *res);++-- void PQclear(PQresult *res); (essentially = free)++-- int PQntuples(const PGresult *res);++-- char* PQgetvalue(const PGresult *res, int row_number, int column_number);+-- int PQgetisnull(const PGresult *res, int row_number, int column_number);+-- int PQgetlength(const PGresult *res, int row_number, int column_number);++-- XXX Other functions for async requests+-- http://www.postgresql.org/docs/7.4/interactive/libpq-async.html++foreign import ccall unsafe "static libpq-fe.h PQfinish"+ pqFinish :: Ptr PGconn -> IO ()++-- XXX Should use bracket or somesuch, but we have the old IO/MonadIO problem+withDatabaseRaw :: MonadIO m => String -> DatabaseT m a -> m a+withDatabaseRaw conninfo (DatabaseT f)+ = do dbh <- liftIO $ withCString conninfo pqConnectDB+ if dbh == nullPtr+ then error "XXX dbh was NULL - can't happen?"+ else do stat <- liftIO $ pqStatus dbh+ if stat /= connection_OK+ then do err <- liftIO $ pqErrorMessage dbh >>= peekCString+ error err -- XXX+ else do res <- evalStateT f (DatabaseHandle dbh)+ liftIO $ pqFinish dbh+ return res++data ConnectionInfo = ConnectionInfo { host :: Maybe String,+ hostaddr :: Maybe String,+ port :: Maybe String,+ dbname :: Maybe String,+ user :: Maybe String,+ password :: Maybe String,+ connect_timeout :: Maybe String,+ options :: Maybe String,+ sslmode :: Maybe String,+ service :: Maybe String }++defaultConnectionInfo :: ConnectionInfo+defaultConnectionInfo = ConnectionInfo { host = Nothing,+ hostaddr = Nothing,+ port = Nothing,+ dbname = Nothing,+ user = Nothing,+ password = Nothing,+ connect_timeout = Nothing,+ options = Nothing,+ sslmode = Nothing,+ service = Nothing }++withDatabase :: MonadIO m => ConnectionInfo -> DatabaseT m a -> m a+withDatabase conninfo f+ = withDatabaseRaw conninfo' f+ where conninfo' = concat $ intersperse " " $ catMaybes [+ mkSetting "host" host,+ mkSetting "hostaddr" hostaddr,+ mkSetting "port" port,+ mkSetting "dbname" dbname,+ mkSetting "user" user,+ mkSetting "password" password,+ mkSetting "connect_timeout" connect_timeout,+ mkSetting "options" options,+ mkSetting "sslmode" sslmode,+ mkSetting "service" service]+ mkSetting name extract+ = case extract conninfo of+ Just val -> Just (name ++ "='" ++ escape val ++ "'")+ Nothing -> Nothing+ escape ('\'':cs) = '\\':'\'':escape cs+ escape ('\\':cs) = '\\':'\\':escape cs+ escape (c:cs) = c:escape cs+ escape "" = ""+
+ GPL-2 view
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+ PostgreSQL.cabal view
@@ -0,0 +1,25 @@+Name: PostgreSQL+Version: 0.1+License: OtherLicense+License-File: COPYING+Copyright: Ian Lynagh, 2006, 2007+Author: Ian Lynagh+Maintainer: igloo@earth.li+Stability: experimental+Synopsis: Thin wrapper over the C postgresql library+Description:+ A thin wrapper over the C postgresql library. Not yet complete,+ but certainly usable. Designed for PostgreSQL 8.1, but may be usable+ with other versions.+Category: Database+Tested-With: GHC==6.6+Build-Depends: base, mtl+Extensions: EmptyDataDecls+ ForeignFunctionInterface+ OverlappingInstances+ UndecidableInstances+Extra-source-files: "BSD3", "GPL-2"+Exposed-modules:+ Database.PostgreSQL+GHC-Options: -Wall+
+ Setup.hs view
@@ -0,0 +1,8 @@++module Main (main) where++import Distribution.Simple++main :: IO ()+main = defaultMainWithHooks defaultUserHooks+