I can speak to haskelldb a little, see below:
On Jan 2, 2008 3:50 AM, Peter Verswyvelen
ยท regarding Haskell and databases, the page http://haskell.org/haskellwiki/Libraries_and_tools/Database_interfaces describes a few, but which are the ones that are stable and practical? Any user experiences?
I started looking at haskell database libraries to generate SQL for me. Haskelldb does this well - it uses a higher-level representation of queries based on "relational algebra" (also the basis of SQL) which is pretty easy to understand if you know SQL. It takes care of a lof the details of generating SQL strings, and does it in a mostly type-safe way. It is a bit complicated to install the library and all its dependencies, because it can work with 3+ (mysql, postgres, odbc) databases using two different backends (hdbc and hsql). I chose to go with HDBC because it compiled on Windows and postgres because thats what we have at my workplace. Once I got it built and installed its worked well for me. Until the most recent versions though, it added a "distinct" operator to all select statements. I submitted a patch which was accepted and now that behavior is no longer the default. It is semi-actively maintained by the original authors and Bjorn, at least, has been very responsive to my queries on the haskelldb-users mailing list. He also has made minor updates to keep it compiling with the latest GHC and Cabal. Hope that helps! Justin