Re: [database-devel] Welcome to database-devel!

Hello! I'm particularly interested in getting non-relational databases working well with Haskell, particularly ones with distributed queries/processing such as MapReduce. My first goal is to fix up a better interface to MongoDB's MapReduce for applications using Persistent. My general interests are SQL-alternatives and distributed computing. However I'll be swamped for the next two months, so I'm not expecting any progress any time soon. Drew Haven drew.haven@gmail.com On Mon, May 7, 2012 at 7:10 AM, Torsten Grust wrote:

Hi all,

just wanted to say `hi'. We are the folks working on Database-Supported Haskell (DSH on hackag e [1]), a library which allows you to continue to use the famililar list-processing combinators -- or list comprehensions, for that matter -- when formulating database queries.[2]

Such expressions are compiled into a (small) group of cooperating SQL statements which effectively evaluate the expression over the tables of an associated relational DBMS (these tables are thus looked at as if they were lists of tuples).

We are always interested in growing the set of functions that DSH understand as ``database-able''. Further work is underway to support arbitrary non-recursive algebraic datatypes in such queries (based on GHC's generic deriving mechanism).

We're thus living on the ``don't embed literal SQL text into your Haskell source at all'' end of the spectrum, somewhat distant from postgresql-simple and friends, I guess. Still, we're quite interested where these other efforts go.

Cheers, --Torsten

[1] http://hackage.haskell.org/**package/DSHhttp://hackage.haskell.org/package/DSH [2] http://db.inf.uni-tuebingen.**de/research/dshhttp://db.inf.uni-tuebingen.de/research/dsh

On 7 May 2012, at 15:56, Greg Weber wrote:

...

I worked with a student to lay out a vision for type-safe database access in a GSoC proposal [1]. I have little interest in the SQL variant at the moment, but plan on making a MongoDB version when I get a free weekend, which may not be until after I am done mentoring GSoC projects.

[1] http://www.google-melange.com/**gsoc/proposal/review/google/** gsoc2012/zhulikas/1http://www.google-melange.com/gsoc/proposal/review/google/gsoc2012/zhulikas/...

On Mon, May 7, 2012 at 3:03 AM, Leon Smith wrote:

...

I thought I should break the ice here; we currently have 22 subscribers, with names I recognize from acid-state, mysql-simple, postgresql-simple, hssqlppp, persistent, and even PostgreSQL itself. If I've missed anything relevant here, please speak up.

So the goal of this list is to help improve the state of database programming in Haskell; I'm not picky about particular topics as long as they are of reasonable quality and relevant to database programming and Haskell. This could be implementing a database in Haskell itself (like acid-state), to interacting with traditional RDBMSes or newer NoSQL systems.

My personal interest at the moment primarily lies at coming up with a good mid-level interface to RDBMSes along the lines of the -simple libraries, but I also have interest in an auto-pipelining client library for PostgreSQL, which involves some very low-level details of the PostgreSQL frontend/backend protocol. I'm also interested in higher-level abstractions for dealing with relational databases in general, but I really don't have well-formed opinions on how this should be done.

Also while SQL can be cool, it hides that coolness under a lot of syntactic (and some semantic) ugliness; I often wish for a simpler, saner syntax, replacing NULL with algebraic data types, and a richer attribute types, especially relationally valued attributes.

So what you interested in?

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-- | Prof. Dr. Torsten Grust | Database Systems — Universität Tübingen (Germany) | torsten.grust@uni-tuebingen.de | db.inf.uni-tuebingen.de

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