Bulk.insert()
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Starting in version 3.2, MongoDB also provides the 从3.2版本开始，MongoDB还提供了db.collection.bulkWrite() method for performing bulk write operations.db.collection.bulkWrite()方法来执行批量写入操作。
Description描述
Bulk.insert(<document>)-
Adds an insert operation to a bulk operations list.将插入操作添加到批量操作列表中。Bulk.insert()accepts the following parameter:接受以下参数：Parameter参数Type类型Description描述docdocument Document to insert.要插入的文档。The size of the document must be less than or equal to the maximum BSON document size.文档的大小必须小于或等于BSON文档的最大大小。
Behavior行为
Insert Inaccuracies插入不准确
Even if you encounter a server error during an insert, some documents may have been inserted.即使在插入过程中遇到服务器错误，也可能已插入某些文档。
After a successful insert, the system returns 成功插入后，系统返回BulkWriteResult.nInserted, the number of documents inserted into the collection. If the insert operation is interrupted by a replica set state change, the system may continue inserting documents. BulkWriteResult.nInserted，即插入集合的文档数。如果插入操作因副本集状态更改而中断，系统可以继续插入文档。As a result, 因此，BulkWriteResult.nInserted may report fewer documents than actually inserted.BulkWriteResult.nInserted可能报告的文档数少于实际插入的文档数。
Example实例
The following initializes a 下面初始化Bulk() operations builder for the items collection and adds a series of insert operations to add multiple documents:items集合的Bulk()操作生成器，并添加一系列插入操作以添加多个文档：
var bulk = db.items.initializeUnorderedBulkOp();
bulk.insert( { item: "abc123", defaultQty: 100, status: "A", points: 100 } );
bulk.insert( { item: "ijk123", defaultQty: 200, status: "A", points: 200 } );
bulk.insert( { item: "mop123", defaultQty: 0, status: "P", points: 0 } );
bulk.execute();