No personal experience yet, but this is the one I will try when I need the
capability:

http://c-jdbc.objectweb.org/

The site has gotten more "user friendly" (sarcasm intended) since I began
following it. This paper sold me:

http://c-jdbc.objectweb.org/current/doc/C-JDBC_horizontal_scalability.pdf

"This communication is intended solely for the addressee and is
confidential and not for third party unauthorized distribution."



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