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Documentation says the following
Python: cv.CreateHist(dims, type, ranges=None, uniform=1) → hist
So I am guessing that the createHist function actually throws back a python defined hist data type.
This link has some information contained on how histograms are actually created. I guess this can help ya further? http://msenux.redwoods.edu/math/python/hist.php
When storing in a database, I would suggest reading out the data of that object type and putting it in a own selected format.