Kdb offers a JDBC, ODBC (Windows Only), C API, Java API, Python API.
Guides to some of the Kdb APIs can be found at: http://www.timestored.com/kdbGuides/
Jdbc seems your best choice for splunk.
http://code.kx.com/wiki/Cookbook/InterfacingWithJava#Is_there_a_JDBC_interface.3F
John at TimeStored
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