mongodb - Finding number of inserted documents in a bulk insert with duplicate keys -


i'm doing bulk-insert mongodb database. know 99% of records inserted fail because of duplicate key error. print after insert how many new records inserted database. being done in python through tornado motor mongodb driver, doesn't matter much.

try:     bulk_write_result = yield db.collections.probe.insert(dataarray, continue_on_error=true)     nr_inserts = bulk_write_result["ninserted"] except pymongo.errors.duplicatekeyerror e:     nr_inserts = ????  <--- should put here?

since exception thrown, bulk_write_result empty. can (except concurrency issues) count of full collection before , after insert, don't roundtrips database line in logfile. there way can discover how many records inserted?

regular insert continue_on_error can't report info want. if you're on mongodb 2.6 or later, however, have high-performance solution error reporting. here's complete example using motor's bulkoperationbuilder:

import pymongo.errors tornado import gen tornado.ioloop import ioloop motor import motorclient  db = motorclient() dataarray = [{'_id': 0},              {'_id': 0},  # duplicate.              {'_id': 1}]   @gen.coroutine def my_insert():     try:         bulk = db.collections.probe.initialize_unordered_bulk_op()          # prepare operation on client.         doc in dataarray:             bulk.insert(doc)          # send server @ once.         bulk_write_result = yield bulk.execute()         nr_inserts = bulk_write_result["ninserted"]     except pymongo.errors.bulkwriteerror e:         print(e)         nr_inserts = e.details['ninserted']      print('nr_inserts: %d' % nr_inserts)   ioloop.instance().run_sync(my_insert)

full documentation: http://motor.readthedocs.org/en/stable/examples/bulk.html

heed warning poor bulk insert performance on mongodb before 2.6! it'll still work requires separate round-trip per document. in 2.6+, driver sends whole operation server in 1 round trip, , server reports how many succeeded , how many failed.


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