To start I'd check out scripted inputs. You can probably use some sort of hard-coded service account with a read-only password to your tables and execute a query from a command line in some short perl or BASH shell script (i.e. mysql). Splunk will basically index the anything from the stdout stream. That will at least get your data in the index so that you can perform query operations against it.
http://www.cyberciti.biz/faq/run-sql-query-directly-on-the-command-line/
http://www.splunk.com/base/Documentation/latest/Developer/ScriptedInputsIntro
Dan
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