Can't connect to localhost database from node.js server

问题

Been having a lot of trouble trying to connect to to my localhost database. I've tried using the mysql and mysql-simple node modules but in both cases I just can't get it to connect.

Here's what I used with the 'mysql' module:

var mysql = require('mysql');
var connection = mysql.createConnection({
  host     : 'localhost',
  port     : '8000',
  user     : 'uber',
  password : 'pass',
});

connection.connect(function(err) {
      if (err) throw err;

      console.log('Connection Successful');
});


connection.query('USE someDB', function(err) {
  if (err) throw err;

  console.log('Query Successful');
});

And here' what I used with the 'mysql-simple' module:

var database = require('mysql-simple');
database.init('uber', 'pass', 'mysql', 'localhost', 8000);

database.querySingle('SELECT Host FROM user', function(err, results) {
    if (err) {
        console.log('error fetching some active users: ' + err);
        return;
    }
    log('Query Successful');
    for (var i = 0; i < results.length; i++)
        console.log('got active user ' + results[i]);
}

In both cases, when I run my node.js server, it never logs that its connected. I've tried replacing localhost with '127.0.01' and creating a new user to make sure the password is correct, but to no avail. Why isn't it connecting?

Thanks

回答1:

It's most likely that networking is turned off, that means that mysql server communicates with clients via UNIX sockets and not via TCP/IP. You can check that out running mysql client and run "status" command. If you see port number there, then your mysql server communicates via TCP/IP, or else you'll see something like "socket pathname…", get the pathname and give it to node.js connection parameters, e.g.

... socketPathname: '/opt/lampp/var/...', ...

Check that out in https://github.com/felixge/node-mysql page (search for "socketPathname")

Hope, that's your problem.

回答2:

change this

database.init('uber', 'pass', 'mysql', 'localhost', 8000);

database.init('uber', 'pass', 'mysql', 'localhost', 3306);

and you should be through

回答3:

Make sure that MySQL and express are running on the same port. I had MySQL bundled from XAMPP, that ran on Port 3036. On setting app.listen to 3036, my code worked. FINALLY!

回答4:

You should use mysql_config to show the path to socket.
This a sample on my MAC

QuyLes-MacBook-Pro:freelancer quyle$ mysql_config
Usage: /Applications/MAMP/Library/bin/mysql_config [OPTIONS]
Options:
        --cflags         [-I/Applications/MAMP/Library/include -fno-omit-frame-pointer   -g -DNDEBUG]
        --include        [-I/Applications/MAMP/Library/include]
        --libs           [-L/Applications/MAMP/Library/lib  -lmysqlclient  -lz]
        --libs_r         [-L/Applications/MAMP/Library/lib   -lmysqlclient_r  -lz]
        --plugindir      [/Applications/MAMP/Library/lib/plugin]
        --socket         [/Applications/MAMP/tmp/mysql/mysql.sock]
        --port           [0]
        --version        [5.5.42]
        --libmysqld-libs [-L/Applications/MAMP/Library/lib  -lmysqld]
        --variable=VAR   VAR is one of:
                pkgincludedir [/Applications/MAMP/Library/include]
                pkglibdir     [/Applications/MAMP/Library/lib]
                plugindir     [/Applications/MAMP/Library/lib/plugin]

and then, you add key socketPath for yourMysqlConnection.
bellow on my sample

MysqlServer: {
     adapter: 'sails-mysql',
     host: 'localhost',
     user: 'root', //optional
     password: 'root', //optional
     database: 'nodejs', //optional,
     socketPath: '/Applications/MAMP/tmp/mysql/mysql.sock'    
},

回答5:

Try this code it's work for me

var mysql = require('mysql');

var connection = mysql.createConnection(
    {
      host     : 'localhost',
      user     : 'root',
      password : '',
      database : 'urdatabase',
    }
);

connection.connect();


query = connection.query("SELECT * FROM UrTable;");
    query
    .on('error', function(err) {
        console.log( err );

    })
    .on('result', function( data ) {
        socket.emit('YourData',data);
    });

I hope this will be helpful for you

来源：https://stackoverflow.com/questions/17493224/cant-connect-to-localhost-database-from-node-js-server

标签

mysql

node.js

node-mysql