为什么有一部分代码没有执行？ Node.js / Oriento

Question

I have call a function, function select(items ,className, callback) ,which have inside a console.log console.log("Function ran.") and the console.log is never made.

Here I called it:

io.on('connection', function(socket){
  console.log('User connected.');

  openServer();  //This start the connection between OrientDB and the Server

  select("name", "Buyers", function(err, data){
    if(err){
      console.log("ERROR: ", err);
    } else {
      console.log("result from db is: ", data);
    }
  });

Code of the function:

function select(items ,className, callback){

    server.query("SELECT "+items+" FROM "+className+"", function(err, result){
      console.log("Function ran.");
      if (err) 
        return callback(err, null);
      else
        return callback(null, result[0].name);
    });
  }

Neither of console.log() of the select function() are executed.

My question is:

• Why does they never get executed?

Answer 1

OrientJS as the old Oriento uses Promises

http://orientdb.com/docs/last/OrientJS-Query.html