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insert

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Summary摘要

insert

An insert event occurs when an operation adds documents to a collection.当操作将文档添加到集合时，会发生insert事件。

Description描述

Field字段Type类型Description描述
_idDocumentA BSON object which serves as an identifier for the change stream event. BSON对象，用作更改流事件的标识符。This value is used as the resumeToken for the resumeAfter parameter when resuming a change stream. 恢复更改流时，此值用作resumeAfter参数的resumeToken。The _id object has the following form:_id对象具有以下形式： 
{
   "_data" : <BinData|hex string>
}
The _data type depends on the MongoDB versions and, in some cases, the feature compatibility version (fCV) at the time of the change stream's opening or resumption. _data类型取决于MongoDB版本，在某些情况下，还取决于更改流打开或恢复时的功能兼容性版本（fCV）。See Resume Tokens for the full list of _data types.请参阅恢复令牌以获取_data类型的完整列表。
For an example of resuming a change stream by resumeToken, see Resume a Change Stream. 有关通过resumeToken恢复更改流的示例，请参阅恢复更改流。
clusterTimeTimestampThe timestamp from the oplog entry associated with the event.与事件关联的oplog条目中的时间戳。
Change stream event notifications associated with a multi-document transaction all have the same clusterTime value: the time when the transaction was committed.与多文档事务关联的更改流事件通知都具有相同的clusterTime值：事务提交的时间。
On sharded clusters, events with the same clusterTime may not all relate to the same transaction. 在分片集群上，具有相同clusterTime的事件可能并不都与同一事务相关。Some events don't relate to a transaction at all.有些事件根本与事务无关。
To identify events for a single transaction, you can use the combination of lsid and txnNumber in the change stream event document. 要识别单个事务的事件，可以在变更流事件文档中使用lsid和txnNumber的组合。
New in version 4.0. 4.0版新增。
collectionUUIDUUIDUUID identifying the collection where the change occurred. 标识发生更改的集合。
New in version 6.0. 6.0版新增。
documentKeydocumentDocument that contains the _id value of the document created or modified by the CRUD operation.包含CRUD操作创建或修改的文档的_id值的文档。
For sharded collections, this field also displays the full shard key for the document. 对于分片集合，此字段还显示文档的完整分片键。The _id field is not repeated if it is already a part of the shard key. 如果_id字段已经是分片键的一部分，则该字段不会重复。
fullDocumentdocumentThe document created by the operation. 操作创建的文档。
Changed in version 6.06.0版更改.
Starting in MongoDB 6.0, if you set the changeStreamPreAndPostImages option using db.createCollection(), create, or collMod, then the fullDocument field shows the document after it was inserted, replaced, or updated (the document post-image). fullDocument is always included for insert events. 从MongoDB 6.0开始，如果使用db.createCollection()、create或collMod设置changeStreamPreAndPostImages选项，则fullDocument字段将显示插入、替换或更新后的文档（文档后映像）。insert事件始终是包含fullDocument。
lsiddocumentThe identifier for the session associated with the transaction.与事务关联的会话的标识符。
Only present if the operation is part of a multi-document transaction. 仅当操作是多文档事务的一部分时才显示。
New in version 4.0. 4.0版新增。
nsdocumentThe namespace (database and or collection) affected by the event. 受事件影响的命名空间（数据库和/或集合）。
ns.collstringThe name of the collection where the event occurred. 发生事件的集合的名称。
ns.dbstringThe name of the database where the event occurred. 发生事件的数据库的名称。
operationTypestringThe type of operation that the change notification reports.更改通知报告的操作类型。
Returns a value of insert for these change events. 返回这些更改事件的insert值。
txnNumberNumberLongTogether with the lsid, a number that helps uniquely identify a transction.与lsid一起，是一个有助于唯一识别事务的数字。
Only present if the operation is part of a multi-document transaction.仅当操作是多文档事务的一部分时才显示。
New in version 4.0. 4.0版新增。
wallTimeISODateThe server date and time of the database operation. 数据库操作的服务器日期和时间。wallTime differs from clusterTime in that clusterTime is a timestamp taken from the oplog entry associated with the database operation event. wallTime与clusterTime的不同之处在于，clusterTime是从与数据库操作事件关联的oplog条目中获取的时间戳。
New in version 6.0. 6.0版新增。

Example实例

The following example illustrates an insert event:以下示例说明了insert事件：

{
   "_id": { <Resume Token> },
   "operationType": "insert",
   "clusterTime": <Timestamp>,
   "wallTime": <ISODate>,
   "ns": {
      "db": "engineering",
      "coll": "users"
   },
   "documentKey": {
      "userName": "alice123",
      "_id": ObjectId("599af247bb69cd89961c986d")
   },
   "fullDocument": {
      "_id": ObjectId("599af247bb69cd89961c986d"),
      "userName": "alice123",
      "name": "Alice"
   }
}

The documentKey field includes both the _id and the userName field. documentKey字段包括_id和userName字段。This indicates that the engineering.users collection is sharded, with a shard key on userName and _id.这表示engineering.users集合是分片的，在userName和_id上有一个分片键。

The fullDocument document represents the version of the document at the time of the insert.fullDocument文档表示插入时文档的版本。