[Haskell-cafe] Use MySQL from Haskell

Michael Snoyman michael at snoyman.com
Thu Jun 18 18:12:25 EDT 2009


I went the HDBC route and got the same problem. Although it does not seem to
be officially blessed, try installing the time-1.1.3 package. It's working
for me at least, which I know is a dubious recommendation.

Also, I am currently using the hdbc-odbc package for accessing MySQL. I
couldn't get hdbc-mysql to work properly. I hope that once I get this
project working right, I'll have a chance to dig into the hdbc-mysql issue

Good luck!


On Fri, Jun 19, 2009 at 12:26 AM, Maciej Podgurski <
maciej.podgurski at googlemail.com> wrote:

> Hello,
> I'm trying to use MySQL from Haskell but it seems impossible for me to
> install one of the MySQL packages on my Windows XP machine.
> First I tired to install hsql-mysql-1.7.1 on GHC 6.10.3 but installing
> haskelldb-hsql failed with a hidden package error. So I added the old-time
> package to the cabal file but there still was a compile error (something due
> to the change from Exception to Exception e => e).
> So I switched to GHC 6.8.3 and tried it again. Now it says:
> Configuring hsql-mysql-1.7.1...
> Warning: 'extra-lib-dirs: /usr/lib/mysql' directory does not exist.
> Warning: 'include-dirs: /usr/include/mysql' directory does not exist.
> Warning: This package indirectly depends on multiple versions of the same
> package. This is highly likely to cause a compile failure.
> package process- requires filepath-
> package directory- requires filepath-
> package Cabal- requires filepath-
> Setup: Missing dependency on a foreign library:
> * Missing C library: mysqlclient
> This problem can usually be solved by installing the system package that
> provides this library (you may need the "-dev" version). If the library is
> already installed but in a non-standard location then you can use the flags
> --extra-include-dirs= and --extra-lib-dirs= to specify where it is.
> There's no Haskell package mysqlclient and I don't know how to install a C
> library in Haskell. So I switched to HDBC-2.1.1 and got the next compile
> error:
> Building convertible-1.0.5...
> Data/Convertible/Instances/Num.hs:671:0:
>    warning: no newline at end of file
> [...]
> [5 of 8] Compiling Data.Convertible.Instances.C (
> Data/Convertible/Instances/C.hs, dist\build/Data/C
> onvertible/Instances/C.o )
> [6 of 8] Compiling Data.Convertible.Instances.Time (
> Data/Convertible/Instances/Time.hs, dist\build/
> Data/Convertible/Instances/Time.o )
> Data/Convertible/Instances/Time.hs:64:0:
>   Duplicate instance declarations:
>     instance Typeable NominalDiffTime
>       -- Defined at Data/Convertible/Instances/Time.hs:(64,0)-(65,42)
>     instance Typeable NominalDiffTime
>       -- Defined in time-1.1.3:Data.Time.Clock.UTC
> Data/Convertible/Instances/Time.hs:67:0:
>   Duplicate instance declarations:
>     instance Typeable UTCTime
>       -- Defined at Data/Convertible/Instances/Time.hs:(67,0)-(68,34)
>     instance Typeable UTCTime
>       -- Defined in time-1.1.3:Data.Time.Clock.UTC
> So please help me, what GHC/package configuration will I need to use MySQL
> from my Haskell programs on Windows? I really like Haskell but all those
> "broken" packages are really discouraging. :(
> Best wishes,
> Maciej
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