小编weg*_*swa的帖子

我试图将我从服务器获取的XML字符串转换为我的Lambda函数中的JSON.
我已经设置了这个相当简单的示例来模拟我使用DynamoDB从服务器获得的XML答案.(目前我只想尝试转换)

'use strict';

var AWS = require('aws-sdk');
var docClient = new AWS.DynamoDB.DocumentClient({region: 'eu-west-1'});


exports.handler = function (e, ctx, callback){    
    let table = "dsbTable";
    let bpNumber = 1337;
    var test;
    var x2js = new X2JS();
    let params = {
            TableName: table,
            Key:{
                "bpNumber": bpNumber
            },
        };
    docClient.get(params, function(err, data) {
            if (err) {
                console.error("Unable to read item. Error JSON:", JSON.stringify(err, null, 2));
                callback(err, null);
            } else {
                console.log("GetItem succeeded:", JSON.stringify(data, null, 2));
                console.log('test' +data.Item.getBp);
                //var jsonObj = x2js.xml_str2json(data.Item.getBp);
                //console.log(jsonObj);

                callback(null, …

在dynamoDB中,我有一个具有连字符属性的表.(例如名字)

现在我想用javascript更新它们.到目前为止这是我的代码:

//create UpdateExpression and ExpressionAttributeValues
    let updateExpression = "set ";
    let expressionAttributeValues ={};
    if (e.firstName !== null){
        updateExpression = updateExpression + " "+ 'first-name'+" = :f,";
        expressionAttributeValues[":f"] = e.firstName;
    }

    let table = "tableName";
    let bpNumber = e.bpNumber;
    let params = {
        TableName: table,
        Key: {
            "bpNumber": bpNumber
        },
        UpdateExpression: updateExpression,
          ExpressionAttributeValues: expressionAttributeValues,
          ReturnValues:"UPDATED_NEW"

    };

    console.log("Updating the item...");
      docClient.update(params, function(err, data) {
          if (err) {
              console.error("Unable to update item. Error JSON:", JSON.stringify(err, null, 2));
          } else {
              console.log("UpdateItem succeeded:", …

使用 DynamoDb 和此处提供的“读取”功能我将如何仅检索特定项目（例如，仅名字、姓氏和城市）
我可能需要添加某种过滤器，但是我无法找到任何我能找到的东西用。

这是我的表结构（以 bpNumber 为主键）：

Item:{
            "salutationCode": "02",
            "lastName1": "Berg",
            "firstName": "Anne",
            "street": "Am Dächle",
            "streetNumber": "22/2",
            "zipcode": "33425",
            "countryCode": "DE",
            "city": "Hausen",
            "bpNumber": 222,
            "dateOfBirth": "1955-07-01",
            "attri": [
              {
                "attri1":"nonono"
              },
              {
                "attri2": "yeayeayea"
              }
            ]

        }

这是我正在使用的“读取”方法：

read(){
        var docClient = new AWS.DynamoDB.DocumentClient()

        var table = "businessPartnersData";

        var bpNumber = 222;

        var params = {
            TableName: table,
            Key:{
                "bpNumber": bpNumber
            }
        };

        docClient.get(params, function(err, data) {
            if (err) {
                console.error("Unable to read item. Error …