一旦我的Firebase应用程序上的云功能被调用,我想对我的数据库执行查询.
假设我在数据库上有一个触发器,请考虑get started guide on Firebase中提供的示例.
// Listens for new messages added to /messages/:pushId/original and creates an // uppercase version of the message to /messages/:pushId/uppercase exports.makeUppercase = functions.database.ref('/messages/{pushId}/original') .onWrite(event => { // Grab the current value of what was written to the Realtime Database. const original = event.data.val(); console.log('Uppercasing',event.params.pushId,original); const uppercase = original.toUpperCase(); // I'D LIKE TO PERFORM A QUERY HERE,JUST A SIMPLE RETRIEVE BASED ON THE ID PROVIDED // You must return a Promise when performing asynchronous tasks inside a Functions such as // writing to the Firebase Realtime Database. // Setting an "uppercase" sibling in the Realtime Database returns a Promise. return event.data.ref.parent.child('uppercase').set(uppercase); });
我应该导入哪些模块?
如何在DB上执行查询?
提前谢谢你的回答!
解决方法
@H_404_14@ 您可以使用 Node.js Admin SDK:const functions = require('firebase-functions'); const admin = require('firebase-admin'); admin.initializeApp(functions.config().firebase); exports.makeUppercase = functions.database() .ref('/messages/{pushId}/original') .onWrite(event => { return admin.database().ref('/other') .orderByChild('id').equalTo(event.params.pushId) .once('value').then(snapshot => { // there,I queried! }); });