Cursor Methods¶

These methods modify the way that the underlying query is executed.

注解

For details on specific methods, including syntax and examples, click on the specific method to go to its reference page.

Name	Description
`cursor.addOption()`	Adds special wire protocol flags that modify the behavior of the query.’
`cursor.batchSize()`	Controls the number of documents MongoDB will return to the client in a single network message.
`cursor.close()`	Close a cursor and free associated server resources.
`cursor.collation()`	Specifies the collation for the cursor returned by the `db.collection.find()`.
`cursor.comment()`	Attaches a comment to the query to allow for traceability in the logs and the system.profile collection.
`cursor.count()`	Modifies the cursor to return the number of documents in the result set rather than the documents themselves.
`cursor.explain()`	Reports on the query execution plan for a cursor.
`cursor.forEach()`	Applies a JavaScript function for every document in a cursor.
`cursor.hasNext()`	Returns true if the cursor has documents and can be iterated.
`cursor.hint()`	Forces MongoDB to use a specific index for a query.
`cursor.itcount()`	Computes the total number of documents in the cursor client-side by fetching and iterating the result set.
`cursor.limit()`	Constrains the size of a cursor’s result set.
`cursor.map()`	Applies a function to each document in a cursor and collects the return values in an array.
`cursor.maxScan()`	Specifies the maximum number of items to scan; documents for collection scans, keys for index scans.
`cursor.maxTimeMS()`	Specifies a cumulative time limit in milliseconds for processing operations on a cursor.
`cursor.max()`	Specifies an exclusive upper index bound for a cursor. For use with `cursor.hint()`
`cursor.min()`	Specifies an inclusive lower index bound for a cursor. For use with `cursor.hint()`
`cursor.next()`	Returns the next document in a cursor.
`cursor.noCursorTimeout()`	Instructs the server to avoid closing a cursor automatically after a period of inactivity.
`cursor.objsLeftInBatch()`	Returns the number of documents left in the current cursor batch.
`cursor.pretty()`	Configures the cursor to display results in an easy-to-read format.
`cursor.readConcern()`	Specifies a read concern for a `find()` operation.
`cursor.readPref()`	Specifies a read preference to a cursor to control how the client directs queries to a replica set.
`cursor.returnKey()`	Modifies the cursor to return index keys rather than the documents.
`cursor.showRecordId()`	Adds an internal storage engine ID field to each document returned by the cursor.
`cursor.size()`	Returns a count of the documents in the cursor after applying `skip()` and `limit()` methods.
`cursor.skip()`	Returns a cursor that begins returning results only after passing or skipping a number of documents.
`cursor.snapshot()`	Forces the cursor to use the index on the `_id` field. Ensures that the cursor returns each document, with regards to the value of the `_id` field, only once.
`cursor.sort()`	Returns results ordered according to a sort specification.
`cursor.tailable()`	Marks the cursor as tailable. Only valid for cursors over capped collections.
`cursor.toArray()`	Returns an array that contains all documents returned by the cursor.

← db.collection.validate() cursor.addOption() →