What is dbslayer? Its a specialized web server that receives urlencoded JSON formatted SQL queries, parses and executes them, and returns a JSON encoded result set over HTTP. Cool huh? I really wish it returned XML instead, and it looks like that might be a possibility, but I'll have to do some digging and tinkering.
I'm compiling dbslayer on debian:
cd /usr/src svn co http://www.dbslayer.org/svn/dbslayer/trunk/ ./dbslayer apt-get install libapr1-dev libaprutil1-dev libmysqlclient15-dev./configure make
The binary is located in server/dbslayer.
Yes, it appears that in more recent versions of dbslayer, it is possible to specify a "FORMAT" argument, however it isn't documented well. Furthermore, its appears to be rather inefficient - the result set is first parsed into json and then serialized into xml, instead of just going straight to xml.
When reading about dbslayer, I found out about mod_ndb. I would really like to combine these two projects!
What I like about DB Slayer
What I like about mod_ndb
Another idea is to use Nexista to receive requests and respond with XML or JSON. The idea comes with some side benefits like intelligent caching, security, and a variety of web servers to choose from. But the requirement of PHP and all the extensions is pretty significant.
UPDATE: The Cherokee web server has integrated dbslayer as a mysql loadbalancer. Very interesting. Unfortunately, no XML output. :-(