My apologies; I expressed my question rather incoherently.
if the question is, I want to multiple insert like [{'a':1, 'b':2, 'c':3},
> {'a':2}, {'a':3, 'b':4}], etc. only some dictionaries are missing different
> keys, that is not allowed. The structure of the SQL statement as parsed by
> MySQL determines for which columns the server-side default is emitted and
> there is only one version of that with an executemany. So every param
> dictionary must have at least all the keys which the first one does.
>
This was the basic scenario of my question. However, unless I misunderstand,
it does seem to be "allowed": the missing values are replaced with NULL in
the generated query. But what I actually meant to ask was this: sqlalchemy
handles missing dictionary entries as NULL for the purpose of inserts, is
there an easy way to have it generate a SQL statement with DEFAULT for
missing dictionary entries?
Eg. execute(testtable.insert(), [{'a':1, 'b':2, 'c':3}, {'a':2}, {'a':3,
'b':4}]) => INSERT INTO testtable (a,b,c) VALUES
(1,2,3),(2,DEFAULT,DEFAULT),(3,4,DEFAULT)
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