How to Get Primary Key and Unique Constraint Columns in Derby?

stackoverflow.com/questions/845766/derby... It took some digging to find the above question; my question is a partially answered follow-up question to the one above. Taking the CONSTRAINTID against SYSKEYS gives a CONGLOMERATEID, which when taken against SYSCONGLOMERATES yields a DESCRIPTOR. The DESCRIPTOR is a POJO that contains an int-array in the baseColumnPositions method.

This int-array contains the COLUMNNUMBERS in SYSCOLUMNS of the columns in the constraint. If querying in straight SQL, getting the DESCRIPTOR field yields a string with a CSV list of ints that have to be parsed. Fortunately for me, I happen to be working in Clojure, so calling the baseColumnPositions method and using the resulting int-array are trivial.

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