Question

All examples i’ve seen were doing a query first and then send to client some info.

If I do a query FIRST and then use results in functions it works:

client.query(
  ('SELECT * FROM '+TABLES_USERS),
  function(err, results, fields) {
var Users = (results);
  io.sockets.on('connection', function (socket) {
      socket.on('event1', function (data) {
          var requser = Users[data];
      socket.emit('event2', requser);
});
  });
    client.end();
  });

But now i need to do a query on client’s request.
I tried something like this but query doesn’t work:

io.sockets.on('connection', function (socket) {
 socket.on('event1', function (data) {
        console.log('query required'); /*works*/
        client.query(
          ('SELECT * FROM '+TABLES_USERS+' WHERE id_user ='+data),
          function(err, results, fields) {
              if (err) {throw err; /*doesn't work*/
                console.log('error'); /*doesn't work*/ }
                console.log('query is done'); /*doesn't work too. so i think query just doesn't work cuz there are no error and no results*/
                socket.emit('event2', results);
                client.end();
                    });

 });
});

Answer 1

I’ve solved the problem by using node-mysql-libmysqlclient instead of node-mysql. But if someone knows a way to do a query AFTER client’s request in node-mysql, please tell me))