如何使用 Firebase 数据库中的特定字段检索多个数据

Question

我正在尝试按照 firebase 教程检索数据并在 Google 中显示 assistant.But 我无法从 Dialogflow 中的数据库检索多个数据 fulfillment.I 想询问用户要在该字段中输入注册 ID，已获取学生详细信息的其余字段。

我尝试了 firebase 文档。我的数据库连接成功，但我无法检索数据，而且我想要求用户输入学生 ID，即注册号。假设如果我输入 191611238 [RegId] 它将检索 FirstName、EmailId 和年份字段。

* 这是我的 Dialogflow 实现代码 *

const functions = require('firebase-functions');
const { WebhookClient} = require('dialogflow-fulfillment');


// initialise DB connection
const admin = require('firebase-admin');
admin.initializeApp({
    credential: admin.credential.applicationDefault(),
    databaseURL: 'ws://******.firebaseio.com/'
});

process.env.DEBUG = 'dialogflow:debug';

exports.dialogflowFirebaseFulfillment =
    functions.https.onRequest((request, response) => {

        const agent = new WebhookClient({
            request,
            response
        });
        console.log('Dialogflow Request headers: ' + JSON.stringify(request.headers));
        console.log('Dialogflow Request body: ' + JSON.stringify(request.body));

        function getRegId(agent) {
            const RegId = agent.parameters.RegId;

            agent.add(`Thank you...`);


            return
            admin.database().ref('Table/').orderByChild('/RegId').equalTo("$RegId").once("value").then((snapshot) => {

                var Email = snapshot.child("EmailId").val();
                agent.add(`The student Mail is ` + Email);
                var Regno = snapshot.child("RegId").val();
                agent.add(`The student Register no is ` + Regno);
                var name = snapshot.child("FirstName").val();
                agent.add(`The student name is ` + name);
                var year = snapshot.child("CourseName").val();
                agent.add(`The student currently studying ` + year);
                var Gradu = snapshot.child("GraduationTypeName").val();
                agent.add(`The student Department is ` + Gradu);

            });
        }

        // Run the proper function handler based on the matched Dialogflow 
        intent name
        let intentMap = new Map();
        intentMap.set('GetthedetailsofRegisternumber', getRegId);
        agent.handleRequest(intentMap);
    });

我想获取 student.but 的详细信息，我正在获取 Null 即学生邮箱为空

学号为空等我在 Firebase 控制台中收到错误

dialogflowFirebaseFulfillment FIREBASE WARNING: Using an unspecified index. Consider adding ".indexOn": "RegId" at /Table to your security rules for better performance

请告诉我如何根据我要检索所有字段要求用户输入 RegId。

Answer 1

function handleGetthedetailsofRegisternumber(agent){

  const RegId = agent.parameters.RegId;

    var ref = admin.database().ref().child("Table/");
var query = ref.orderByChild("RegId").equalTo(RegId.toString());

query.once("value", function(snapshot) {
  snapshot.forEach(function(child) {
  console.log(child.key);
      // name field

  console.log("FirstName: " + child.val().FirstName);
  console.log("Mobile: " + child.val().MobileNumber);
  console.log("Email: " + child.val().EmailId);
  var name = snapshot.child("FirstName").val();
  agent.add(`The student name is ` + name);

    }); 
  });

如何使用 Firebase 数据库中的特定字段检索多个数据

How to Retrieve multiple data using specific field in Firebase Database

javascript

firebase-realtime-database

dialogflow-es-fulfillment