From the MongoDB docs: A projection can explicitly include several fields. In the following operation, find() method returns all documents ... ... <看更多>

collection.find(query[[[, fields], options], callback]);. Where. query - is a query object, defining the conditions the documents need to apply ... ... <看更多>

Based on my own benchmarks, find().limit(1) is orders of magnitude faster than findOne() . There is either an error in the MongoDB documentation or a bug in ... ... <看更多>

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