Amazon Web Services 文档中描述的 Amazon Web Services 服务或功能可能因区域而异。要查看适用于中国区域的差异，请参阅中国的 Amazon Web Services 服务入门。

帮助我们改进Amazon SDK for JavaScript版本 3 (V3) 文档，方法是使用反馈链接，或者在上创建议题或拉取请求GitHub.

这些区域有：Amazon SDK for JavaScriptV3 API 参考指南详细描述了Amazon SDK for JavaScript版本 3 (V3)。

本文属于机器翻译版本。若本译文内容与英语原文存在差异，则一律以英文原文为准。

创建 Amazon Lambda 函数

配置开发工具包

在libs目录创建一个名为的文件snsClient.js和lambdaClient.js，然后将下面的内容分别粘贴到它们中。

const { SNSClient } = require("@aws-sdk/client-sns");
// Set the AWS Region.
const REGION = "REGION"; // e.g. "us-east-1"
// Create an Amazon Simple Notification Service client object.
const snsClient = new SNSClient({region:REGION});
module.exports = { snsClient };
                

Replace领域使用Amazon区域。此代码可用此处GitHub.

const { LambadaClient } = require( "@aws-sdk/client-lambda" );
// Set the AWS Region.
const REGION = "eu-west-1"; // e.g. "us-east-1"
// Create an Amazon Lambda service client object.
const lambdaClient = new LambdaClient({region:REGION});
module.exports = { lambdaClient };
                

Replace领域使用Amazon区域。此代码可用此处GitHub.

首先导入必需的Amazon SDK for JavaScript(v3) 模块和命令。然后计算今天的日期并将其分配给参数。然后为ScanCommand. 替换TABLE_NAME使用您在中创建的表的名称创建Amazon资源 这个例子的部分。

下面的代码段演示了此步骤。（有关完整示例，请参阅捆绑 Lambda 函数。）

"use strict";
// Load the required clients and commands.
const { ScanCommand }  = require ( "@aws-sdk/client-dynamodb" );
const { PublishCommand } = require ( "@aws-sdk/client-sns" );
const {lambdaClient}  = require ( "./libs/lambdaClient" );
const {snsClient} = require ( "./libs/snsClient" );

// Get today's date.
const today = new Date();
const dd = String(today.getDate()).padStart(2, "0");
const mm = String(today.getMonth() + 1).padStart(2, "0"); //January is 0!
const yyyy = today.getFullYear();
const date = yyyy + "-" + mm + "-" + dd;

// Set the parameters for the ScanCommand method.
const params = {
  // Specify which items in the results are returned.
  FilterExpression: "startDate = :topic",
  // Define the expression attribute value, which are substitutes for the values you want to compare.
  ExpressionAttributeValues: {
    ":topic": { S: date },
  },
  // Set the projection expression, which the the attributes that you want.
  ProjectionExpression: "firstName, phone",
  TableName: "TABLE_NAME",
};

扫描 DynamoDB 表

首先创建一个名为的 async/await 函数sendText使用 Amazon SNS 发布短信PublishCommand. 然后，添加try区块模式，该模式可以扫描 DynamoDB 表以查找员工今天的工作周年纪念日，然后调用sendText函数向这些员工发送短信。如果出现错误catch块被称为。

下面的代码段演示了此步骤。（有关完整示例，请参阅捆绑 Lambda 函数。）

exports.handler = async (event, context, callback) => {
  // Helper function to send message using Amazon SNS.
  async function sendText(textParams) {
    try {
      const data = await snsClient.send(new PublishCommand(textParams));
      console.log("Message sent");
    } catch (err) {
      console.log("Error, message not sent ", err);
    }
  }
  try {
    // Scan the table to check identify employees with work anniversary today.
    const data = await dynamoClient.send(new ScanCommand(params));
    data.Items.forEach(function (element, index, array) {
      const textParams = {
        PhoneNumber: element.phone.N,
        Message:
          "Hi " +
          element.firstName.S +
          "; congratulations on your work anniversary!",
      };
      // Send message using Amazon SNS.
      sendText(textParams);
    });
  } catch (err) {
    console.log("Error, could not scan table ", err);
  }
};

捆绑 Lambda 函数

本主题介绍如何将mylambdafunction.ts和所需Amazon SDK for JavaScript此示例的模块变成一个名为index.js.