blocks|key|1076562|text|..。在保存之前更新该值。|type|blockquote|depth|inlineStyleRanges|entityRanges|data|1076563|恐怕DynamoDB流不是这样工作的。流将只包含已存储在表中的项。|unstyled|1076564|解决这一问题的一种方法是向表中添加另一个属性，该属性指示“作业”是否已准备好处理。默认情况下，添加到表中的作业“未准备好”，然后DynamoDB流将触发Lambda，它执行计算，将作业分配给员工，并将作业设置为“就绪”。|1076565|解决这一问题的另一个选择可能是小规模重组。例如:为什么不使用具有多个步骤的阶跃函数，最后一个步骤是将前一步的计算结果保存到表中。|offset|length|1076566|entityMap|0|LINK|mutability|MUTABLE|url|https://aws.amazon.com/step-functions/^0|0|0|0|11|4|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$]]|$1|E|3|F|5|D|7|U|8|@]|9|@]|A|$]]|$1|G|3|H|5|D|7|V|8|@]|9|@$I|W|J|X|1|Y]]|A|$]]|$1|K|3|-4|5|D|7|Z|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

<blockquote>
[...] the value is updated before saving.
</blockquote>
I am afraid that DynamoDB streams do not work like this. The stream will contain only items that are already stored in the table.
One way to solve this, is to add another property to your table that indicates if the &quot;job&quot; is ready to process. By default, jobs that are added to the table are &quot;not ready&quot;, then the DynamoDB stream is going to trigger your Lambda, which does its calculations, assigns the job to an employee AND sets the job to &quot;ready&quot;.
Another option to solve this might be a little restructuring. For example: why not use a <a href="https://aws.amazon.com/step-functions/" rel="nofollow noreferrer">Step Function</a> that has multiple steps, the final one being a step to save the calculated result of the previous step(s) into the table.

blocks|key|1060736|text|更有可能的是，您最终将启用带有Lambda函数的DynamoDB流从该流中读取。这会给你“在每一个新条目上值是.”然后，该函数将执行您提到的任务的计算和分配。我建议从这来自Lambda触发器上的DynamoDB文档。和这来自AWS关于使用DynamoDB流的文档。开始。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1060737|如果这不能让你朝着正确的方向前进，让我知道，我会为你挖掘更多。|1060738|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Streams.Lambda.html|1|https://docs.aws.amazon.com/lambda/latest/dg/with-ddb-example.html^0|2B|P|0|31|N|1|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]|$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|X|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]|N|$5|I|J|K|C|$L|O]]]]

More than likely, you'll end up enabling DynamoDB Streams with a Lambda function to read from that stream. That'll give you the &quot;on each new entry the value is...&quot; The function would then do the calculations and assigning of the job you mentioned. I recommend starting with <a href="https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Streams.Lambda.html" rel="nofollow noreferrer">this from the DynamoDB documentation on Lambda triggers</a> as well as <a href="https://docs.aws.amazon.com/lambda/latest/dg/with-ddb-example.html" rel="nofollow noreferrer">this from the AWS Lambda documentation on working with DynamoDB Streams</a>.
If that does not get you going in the right direction, let me know and I will dig up more for you.

<h2>Background</h2>
I would like to create a DynamoDB trigger such that on each new entry the value is updated before saving.
The DynamoDB table consists of Jobs/tasks and I would like to do calculations and assign the job/task to the respective employee.
The task seems relatively simple just need some guidance and assistance creating a lamda function that can accomplish this.

AWS Lamdba Trigger DynamoDB to Update Value

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

文章

问答

视频

教程

学习中心

腾讯云实验室

直播

竞赛

腾讯云代码分析专区

腾讯iOA零信任安全管理系统专区

腾讯云架构师技术同盟交流圈

腾讯云数据库专区

腾讯云智能顾问专区

腾讯云原生专区

腾讯混元专区

腾讯云TCE专区

腾讯云Lighthouse专区

腾讯云HAI专区

腾讯云Edgeone专区

腾讯云存储专区

腾讯云智能专区

腾讯轻联专区 

腾讯云开发专区

TAPD专区

腾讯轻量云游戏服专区

腾讯云最具价值专家

腾讯云架构师技术同盟

腾讯云创作之星

腾讯云开发者先锋

腾讯云代码助手

云原生构建

TAPD 敏捷项目管理

Cloud Studio

SDK中心

API中心

命令行工具

涵盖代码开发、场景应用、自动测试全流程，助你从零构建专属AI助手

一站式MCP教程库，解锁AI应用新玩法

聚焦“写作效率、视觉美观与运行性能”三方面进行全面升级，为您提供更高效、稳定的创作环境

社区富文本&Markdown编辑器全新改版上线，欢迎大家体验!

诚挚邀请您参与本次调研，分享您的真实使用感受与建议。您的反馈至关重要，感谢您的支持与参与！

社区新版编辑器体验调研

背景我希望创建一个DynamoDB触发器，以便在每个新条目上在保存之前更新该值。DynamoDB表由作业/任务组成，我希望进行计算，并将作业/任务分配给相应的员工。任务似乎相对简单，只是需要一些指导和帮助，创建一个lamda函数来完成这一任务。

问AWS触发DynamoDB更新值
EN

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问AWS触发DynamoDB更新值EN