如何处理 NodeJS 上的 MySQL 断开连接？

Question

First of all, I'm a beginner on NodeJS. Well, I'm using a shared hosting to my project and when the database reaches 1 minute of inactivity, NodeJS crashes and disconnects me from MySQL. Since I'm using a shared hosting, I can't edit the idle time on the MySQL config and I'll need to handle it in code.

I'm using module.exports to handle my connection, as shown below. So how can I make an auto-reconnection script to take care of my issue? Thank you.

var mysql = require('mysql');

module.exports =
{
handle: null,

connect: function(call){
    this.handle = mysql.createConnection({
        host     : 'localhost',
        user     : 'root',
        password : '',
        database : 'test',
        timezone: 'utc',
        charset : 'utf8'
    });

    this.handle.connect(function (err) {
        if(err) {
            console.log("[MySQL] Connection error: " + err.code);
        } else {
            console.log("[MySQL] Successfully connected");
        }
    });
  }
};

Answer 1

The node mysql module that you are using also has a connection pooling mechanism.

Check out the docs at https://github.com/mysqljs/mysql#pooling-connections

Connection pools will make you task easier. You can then store the connection pool object and use its getConnection method to obtain a connection. Make sure that you release the connection when you are done with it.

If for some reason you cant use connection pooling then you will have to listen for error event on the connection and handle it accordingly. But I strongly recommend that you use connection pool.