[Haskell] ANNOUNCE: HaskellDB 0.6
chucky at dtek.chalmers.se
Wed Mar 3 22:02:28 EST 2004
We are pleased to announce the second alpha release of our "remake" of
HaskellDB, version 0.6. The main feature of this release is our
implementation of bounded lists, which may even be interesting outside
of HaskellDB. Read on below for more information about it.
HaskellDB is a Haskell library for expressing database queries and
operations in a type safe and declarative way. HaskellDB compiles a
relational algebra-like syntax into SQL, submits the operations to the
database for processing, and returns the results as ordinary Haskell values.
The original version of HaskellDB was written by Daan Leijen and is
available at http://www.haskell.org/haskellDB/. The implementation is
based on his paper which can be found at:
Our implementation is available at:
New in HaskellDB 0.6:
- Bounded lists and bounded strings (see below)
- Vastly increased performance. On reasonably modern computers, I/O is now
the limiting factor when doing database operations
- Transactions are now supported
- Some error messages (esp. some type errors) are easier to understand
- Better documentation
- Many, many bug fixes
About bounded lists:
The main idea of bounded lists is to create lists with predetermined
BoundedList is a simple, fast and type safe approach to implementing
this idea. The implementation is based on inductive instances, making it
very easy to expand with new bounds. A new bound only requires one
instance of Size and two instances of Less.
NOTE: Due to changes in DbDirect, any files generated using the old
version of HaskellDB should be regenerated.
The developers can be reached at haskelldb-users at lists.sourceforge.net
or on #haskelldb at irc.freenode.net.
/ The HaskellDB development team
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