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
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!
});
});
