Collection Methods¶

注解

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

Name	Description
`db.collection.aggregate()`	Provides access to the aggregation pipeline.
`db.collection.bulkWrite()`	Provides bulk write operation functionality.
`db.collection.count()`	Wraps `count` to return a count of the number of documents in a collection or matching a query.
`db.collection.copyTo()`	Deprecated. Wraps `eval` to copy data between collections in a single MongoDB instance.
`db.collection.createIndex()`	Builds an index on a collection.
`db.collection.dataSize()`	Returns the size of the collection. Wraps the `size` field in the output of the `collStats`.
`db.collection.deleteOne()`	Deletes a single document in a collection.
`db.collection.deleteMany()`	Deletes multiple documents in a collection.
`db.collection.distinct()`	Returns an array of documents that have distinct values for the specified field.
`db.collection.drop()`	Removes the specified collection from the database.
`db.collection.dropIndex()`	Removes a specified index on a collection.
`db.collection.dropIndexes()`	Removes all indexes on a collection.
`db.collection.ensureIndex()`	Deprecated. Use `db.collection.createIndex()`.
`db.collection.explain()`	Returns information on the query execution of various methods.
`db.collection.find()`	Performs a query on a collection and returns a cursor object.
`db.collection.findAndModify()`	Atomically modifies and returns a single document.
`db.collection.findOne()`	Performs a query and returns a single document.
`db.collection.findOneAndDelete()`	Finds a single document and deletes it.
`db.collection.findOneAndReplace()`	Finds a single document and replaces it.
`db.collection.findOneAndUpdate()`	Finds a single document and updates it.
`db.collection.getIndexes()`	Returns an array of documents that describe the existing indexes on a collection.
`db.collection.getShardDistribution()`	For collections in sharded clusters, `db.collection.getShardDistribution()` reports data of chunk distribution.
`db.collection.getShardVersion()`	Internal diagnostic method for shard cluster.
`db.collection.group()`	Deprecated. Provides simple data aggregation function. Groups documents in a collection by a key, and processes the results. Use `aggregate()` for more complex data aggregation.
`db.collection.insert()`	Creates a new document in a collection.
`db.collection.insertOne()`	Inserts a new document in a collection.
`db.collection.insertMany()`	Inserts several new document in a collection.
`db.collection.isCapped()`	Reports if a collection is a capped collection.
`db.collection.latencyStats()`	Returns latency statistics for a collection.
`db.collection.mapReduce()`	Performs map-reduce style data aggregation.
`db.collection.reIndex()`	Rebuilds all existing indexes on a collection.
`db.collection.replaceOne()`	Replaces a single document in a collection.
`db.collection.remove()`	Deletes documents from a collection.
`db.collection.renameCollection()`	Changes the name of a collection.
`db.collection.save()`	Provides a wrapper around an `insert()` and `update()` to insert new documents.
`db.collection.stats()`	Reports on the state of a collection. Provides a wrapper around the `collStats`.
`db.collection.storageSize()`	Reports the total size used by the collection in bytes. Provides a wrapper around the `storageSize` field of the `collStats` output.
`db.collection.totalSize()`	Reports the total size of a collection, including the size of all documents and all indexes on a collection.
`db.collection.totalIndexSize()`	Reports the total size used by the indexes on a collection. Provides a wrapper around the `totalIndexSize` field of the `collStats` output.
`db.collection.update()`	Modifies a document in a collection.
`db.collection.updateOne()`	Modifies a single document in a collection.
`db.collection.updateMany()`	Modifies multiple documents in a collection.
`db.collection.validate()`	Performs diagnostic operations on a collection.

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