How to find bad row with db api executemany()?

Miki Tebeka miki.tebeka at
Sat Mar 30 17:24:31 CET 2013

> I can catch the exception, but don't see any way to tell which row caused the problem.  Is this information obtainable, short of retrying each row one by one?
One way to debug this is to wrap the iterable passed to executemany with one that remembers the last line. Something like:

    class LastIterator(object):
        def __init__(self, coll):
   = iter(coll)
            self.last = None

        def __iter__(self):
            return self

        def next(self):
            self.last = next(
            return self.last

      li = ListIterator(items)
           cursor.executemany(sql, li)
      except SQLError, e:
           print('Error: {}, row was {}'.format(e, li.last))

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