Database Manual / Reference / mongosh Methods / Bulk Operations

Bulk.find.update() (mongosh method方法)

Tip

MongoDB also provides the Mongo.bulkWrite() method for performing bulk write operations.MongoDB还提供了Mongo.bulkWrite()方法来执行批量写入操作。

Description描述

Bulk.find.update(<update>)

Adds a multi update operation to a bulk operations list. The method updates specific fields in existing documents.将multi更新操作添加到批量操作列表中。该方法更新现有文档中的特定字段。

Use the Bulk.find() method to specify the condition that determines which documents to update. 使用Bulk.find()方法指定确定要更新哪些文档的条件。The Bulk.find.update() method updates all matching documents. To specify a single document update, see Bulk.find.updateOne().Bulk.find.update()方法更新所有匹配的文档。要指定单个文档更新，请参阅Bulk.find.updateOne()。

Bulk.find.update() accepts the following parameter:接受以下参数：

Parameter参数Type类型Description描述
updatedocument or pipeline文件或管道

The modifications to apply. Can be one of the following:要应用的修改。可以是以下之一：

Update document更新文档Contains only update operator expressions.仅包含更新运算符表达式。
Aggregation pipeline聚合管道

Contains only the following aggregation stages:仅包含以下聚合阶段：

For more information on the update modification parameter, see the db.collection.updateMany() reference page.有关更新修改参数的更多信息，请参阅db.collection.updateMany()参考页面。

The sum of the associated <query> document from the Bulk.find() and the update document must be less than or equal to the maximum BSON document size.来自Bulk.find()的关联<query>文档和更新文档的总和必须小于或等于BSON文档的最大大小。

Compatibility兼容性

This command is available in deployments hosted in the following environments:此命令在以下环境中托管的部署中可用：

  • MongoDB Atlas: The fully managed service for MongoDB deployments in the cloud：云中MongoDB部署的完全托管服务

Note

This command is supported in all MongoDB Atlas clusters. 所有MongoDB Atlas集群都支持此命令。For information on Atlas support for all commands, see Unsupported Commands.有关Atlas支持所有命令的信息，请参阅不支持的命令。

Example示例

The following example initializes a Bulk() operations builder for the items collection, and adds various multi update operations to the list of operations.以下示例初始化items集合的Bulk()操作生成器，并将各种multi更新操作添加到操作列表中。

var bulk = db.items.initializeUnorderedBulkOp();
bulk.find( { status: "D" } ).update( { $set: { status: "I", points: "0" } } );
bulk.find( { item: null } ).update( { $set: { item: "TBD" } } );
bulk.execute();

Update with Aggregation Pipeline使用聚合管道进行更新

Update methods can accept an aggregation pipeline. For example, the following uses:更新方法可以接受聚合管道。例如，以下使用：

  • the $set stage which can provide similar behavior to the $set update operator expression,$set阶段可以提供与$set更新运算符表达式类似的行为，
  • the aggregation variable NOW, which resolves to the current datetime and can provide similar behavior to a $currentDate update operator expression. To access aggregation variables, prefix the variable with double dollar signs $$ and enclose in quotes.聚合变量NOW解析为当前日期时间，并可以提供与$currentDate更新运算符表达式类似的行为。要访问聚合变量，请在变量前添加双美元符号$$并括在引号中。
var bulk = db.items.initializeUnorderedBulkOp();
bulk.find( { status: "P" } ).update(
   [
      { $set: { points: 0, lastModified: "$$NOW" } }
   ]
);
bulk.execute();

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