real-time-updates

问题 I'm a newbie in Nodejs and I want to send data to the client when an update occurs on MySQL. So I found the ORM, Sequelize. Can I know an update event from MySQL using Sequelize? Or how can I know an update event on MySQL using Nodejs with MySQL? 回答1: In case of MySql, triggers are the best option. MySQL Triggers: a trigger or database trigger is a stored program executed automatically to respond to a specific event e.g., insert, update or delete occurred in a table. For example:- You can

来源： https://stackoverflow.com/questions/58276148/firestore-onsnapshot-duplicates-all-dom-elements-instead-of-replacing-updating-t

来源： https://stackoverflow.com/questions/58276148/firestore-onsnapshot-duplicates-all-dom-elements-instead-of-replacing-updating-t

问题 I need to create a GUI to show real-time data coming from the Serial port. I'm reading serial port data from a separate thread and I need to update GUI from there. My current implementation is like this. class Gui extends JFrame { private JLabel lbl = new JLabel(); .... void updateLabel(String text) { lbl.setText(text); } } class CommPortReceiver extends Thread { private Gui gui = new Gui(); void run() { gui.setVisible(true); .... while (true) { if (dataAvailable) { .... gui.updateLabel(data)

问题 I am trying to learn how to use socket.io by building a simple chat app using the socket.io library and MEAN stack. From looking at some open source projects(like this one) I have seen that the client, mainly when executing the chat logic, communicates with the server via websockets and not the http client service provided by angular. Does this mean that when using web-sockets for real time updates there is no need to use http to communicate with the server? 回答1: Most assuredly not. It is not

问题 I am trying to learn how to use socket.io by building a simple chat app using the socket.io library and MEAN stack. From looking at some open source projects(like this one) I have seen that the client, mainly when executing the chat logic, communicates with the server via websockets and not the http client service provided by angular. Does this mean that when using web-sockets for real time updates there is no need to use http to communicate with the server? 回答1: Most assuredly not. It is not

问题 i am using the Google Api to create a Real Time Multiplayer - Top down shooter game with libGDX. Player positions are send over "sendUnreliableMessage" on every call of the "render()" method : render() called. "Device A" sends the local Player position (x, y) and the moving direction over "sendUnreliableMessage". "Device B" recieves the message. Interpolates between the last position (x,y) and the new position (x,y). "Device B" moves the local enemy Player to the new positions. (Interpolated

问题 I want to use SignalR in my project for real time updates. My project is developed in WebForms . I searched for for 3,4 days but all I found were MVC examples. Can anyone suggest a solution? 回答1: You can use SignalR with webforms. See below for an example from the tutorial here Create a new ASP.NET WebForms project targeting .NET Framework 4.5 or later Change the home page to contain the following <asp:content runat="server" id="BodyContent" contentplaceholderid="MainContent"> <h3>Log Items<

问题 I'm currently developing a Real-Time Multiplayer top down shooter. The Multiplayer is "working" and I'm currently struggling with pushing the player updates such as position and fired shots. My first try was using the service "appWarp" which worked perfectly but isn't free and only provided around 2 Million Messages in the free version which i completely filled in around 2 weeks with only 2 devices and 2 players. ( Maybe way to much updates send ) Then I implemented Google Play Game Services

问题 I have this code for output : $tot_clicks6 = $db->FetchArray($db->Query("SELECT SUM(visits) AS sum_visits FROM surf")); and <?=$tot_clicks6['sum_visits']?> is display total of number. 回答1: Your question represents a common misconception with PHP. The block of code <?=$tot_clicks6['sum_visits']?> Is only that code in your server. As the page is loaded, it gets served as HTML as whatever the value of that variable is. For example, 6 In order to update your page in real time, you need to use