... DDM? as far as I know (and some call me an expert)? impossible!
- Oracle transparent Gateway
++ enables SQL interfaces
-- rathe expensive
+- support ?!

- ArdGate
++ enables SQL interfaces
++ works with all JDBC databases
++ open source
-- open source
++ fast, stable and scalable

-DBGate (Razley)
++ enables SQL interfaces
-- number of installations?
-- performance and scalability?

SQL Integrator? (RJS) - and some other vendors
-- proprietary call level interface
-- additional server needed
++ support, perfromance and scalability

JDBCR4 (Scott)
-- proprietary call level interface
++ open source
-- opensource
-- performance, scalability, stability (uses RPG to JAVA JNI calls)

just my opinion


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