节点 JS 错误“getaddrinfo ENOTFOUND”

Question

I'm having trouble in accessing MYSQL.

There is a GET METHOD at my code below :

    app.get('/users',function(request,response){
    client.query('select * from User where 1=1',function(error,result){
        if(error){
            response.json('unfortunately fail');
            console.log('unfortunately fail , error : %s',error);
            console.log('error stack: %s',error.stack);
            console.log('error message: %s',error.message);
            throw error;
        }else{
            console.log('select success....');
            response.json('select success....');
            response.json(result);
        }
    });
});

When that method is executed, there is an error :

 unfortunately fail , error : Error: getaddrinfo ENOTFOUND
error stack: Error: getaddrinfo ENOTFOUND
at errnoException (dns.js:37:11)
at Object.onanswer [as oncomplete] (dns.js:124:16)
at Protocol._enqueue (/node_modules/mysql/lib/protocol/Protocol.js:135:48)
at Protocol.handshake (/node_modules/mysql/lib/protocol/Protocol.js:52:41)
at Connection.connect (/node_modules/mysql/lib/Connection.js:123:18)
at Connection._implyConnect (/node_modules/mysql/lib/Connection.js:417:10)
at Connection.query (/node_modules/mysql/lib/Connection.js:199:8)
at app.listen.host (/web.js:70:10)
at callbacks (/node_modules/express/lib/router/index.js:164:37)
at param (/node_modules/express/lib/router/index.js:138:11)
at pass (/node_modules/express/lib/router/index.js:145:5)
at Router._dispatch (/node_modules/express/lib/router/index.js:173:5)

And this is about the variables (express, mysql ...)

var http = require('http');
var express = require('express');
var request = require('request');
var mysql = require('mysql');

var client = mysql.createConnection({
    host:'http://nodejs.somewhere.com/WebMysql',
    port : 3306,
    user : 'user',
    password : 'password',
    database  : 'database'
});
var app = express();
app.use(express.bodyParser());
app.use(app.router);

Answer 1

Your host setting for your mysql database connection is incorrect ( ENOTFOUND for getaddrinfo means DNS resolution failed). It needs to be just the hostname of the mysql server (eg nodejs.somewhere.com ).