如何从nodejs客户端重新格式化DynamoDB响应

当我使用aws nodejs客户端从dynamoDB获取请求时，结果包含一个types为key的响应

{ Item: { newrelic_id: { S: 'nr-1234' } , jumpcloud_id: { S: 'j-234' } , microtime: { N: '1475690490854' } , instance_id: { S: 'i-abc1234' } } } 

请注意，值的键是这些types的前缀， String S和数字N是否有删除这个“types键”的方法？

Answer 1

这里是使用DocumentClient的示例代码。

 var AWS = require("aws-sdk"); var creds = new AWS.Credentials('akid', 'secret', 'session'); AWS.config.update({ region : "us-west-2", endpoint : "http://localhost:8000", credentials : creds }); var docClient = new AWS.DynamoDB.DocumentClient(); var table = "Movies"; var year_val = 2015; var title = "The Big New Movie"; var params = { TableName : table, KeyConditionExpression : 'yearkey = :hkey and title = :rkey', ExpressionAttributeValues : { ':hkey' : year_val, ':rkey' : title } }; docClient.query(params, function(err, data) { if (err) { console.error("Unable to read item. Error JSON:", JSON.stringify(err, null, 2)); } else { console.log("GetItem succeeded:", JSON.stringify(data, null, 2)); } }); 

输出： –

输出不具有该属性的数据types。

 GetItem succeeded: { "Items": [ { "title": "The Big New Movie", "yearkey": 2015, "info": { "rating": 0, "plot": "Nothing happens at all." } } ], "Count": 1, "ScannedCount": 1 }