可选allowAllows disk use for blocking sort operations exceeding 100MB memory. (MongoDB 3.2 or higher)
可选allowFor queries against a sharded collection, allows the command (or subsequent getMore commands) to return partial results, rather than an error, if one or more queried shards are unavailable.
可选authdb可选awaitSpecify if the cursor is a tailable-await cursor. Requires tailable to be true
可选batchSet the batchSize for the getMoreCommand when iterating over the query results.
可选bsonreturn BSON regular expressions as BSONRegExp instances.
可选checkthe serializer will check if keys are valid.
可选collationSpecify collation (MongoDB 3.4 or higher) settings for update operation (see 3.4 documentation for available fields).
可选commentComment to apply to the operation.
In server versions pre-4.4, 'comment' must be string. A server error will be thrown if any other type is provided.
In server versions 4.4 and above, 'comment' can be any valid BSON type.
可选db可选enableEnable utf8 validation when deserializing BSON documents. Defaults to true.
可选explainSpecifies the verbosity mode for the explain output.
可选fieldsallow to specify if there what fields we wish to return as unserialized raw buffer.
可选hintTell the query to use specific indexes in the query. Object of indexes to use, {'_id':1}
可选ignoreserialize will not emit undefined fields (default:true)
可选letMap of parameter names and values that can be accessed using $$var (requires MongoDB 5.0).
可选limitSets the limit of documents returned in the query.
可选maxThe exclusive upper bound for a specific index
可选maxThe maximum amount of time for the server to wait on new documents to satisfy a tailable cursor query. Requires tailable and awaitData to be true
可选maxNumber of milliseconds to wait before aborting the query.
可选minThe inclusive lower bound for a specific index
可选noThe server normally times out idle cursors after an inactivity period (10 minutes) to prevent excess memory use. Set this option to prevent that.
可选no可选omit可选oplogOption to enable an optimized code path for queries looking for a particular range of ts values in the oplog. Requires tailable to be true.
可选projectionThe fields to return in the query. Object of fields to either include or exclude (one of, not both), {'a':1, 'b': 1} or {'a': 0, 'b': 0}
可选promotewhen deserializing a Binary will return it as a node.js Buffer instance.
可选promotewhen deserializing a Long will fit it into a Number if it's smaller than 53 bits.
可选promotewhen deserializing will promote BSON values to their Node.js closest equivalent types.
可选rawEnabling the raw option will return a Node.js Buffer which is allocated using allocUnsafe API. See this section from the Node.js Docs here for more detail about what "unsafe" refers to in this context. If you need to maintain your own editable clone of the bytes returned for an extended life time of the process, it is recommended you allocate your own buffer and clone the contents:
const raw = await collection.findOne({}, { raw: true });
const myBuffer = Buffer.alloc(raw.byteLength);
myBuffer.set(raw, 0);
// Only save and use `myBuffer` beyond this point
Please note there is a known limitation where this option cannot be used at the MongoClient level (see NODE-3946).
It does correctly work at Db, Collection, and per operation the same as other BSON options work.
可选readSpecify a read concern and level for the collection. (only MongoDB 3.2 or higher supported)
可选readThe preferred read preference (ReadPreference.primary, ReadPreference.primary_preferred, ReadPreference.secondary, ReadPreference.secondary_preferred, ReadPreference.nearest).
可选retryShould retry failed writes
可选returnIf true, returns only the index keys in the resulting documents.
可选serializeserialize the javascript functions (default:false).
可选sessionSpecify ClientSession for this command
可选showDetermines whether to return the record identifier for each document. If true, adds a field $recordId to the returned documents.
可选singleDetermines whether to close the cursor after the first batch. Defaults to false.
可选skipSet to skip N documents ahead in your query (useful for pagination).
可选sortSet to sort the documents coming back from the query. Array of indexes, [['a', 1]] etc.
可选tailableSpecify if the cursor is tailable.
可选timeoutSpecify if the cursor can timeout.
可选usewhen deserializing a Long will return as a BigInt.
可选will
Unused schema definition, deprecated usage, only specify
FindOptionswith no generic