lastMsg = "Message received";   // recebe a msg
var mysql = require('mysql'); //

    var con = mysql.createConnection({
      host: "localhost",
      user: "yourusername",
      password: "yourpassword",
      database: "mydb"
    });

            con.connect(function(err) {
      if (err) throw err;
      console.log("Connected!");
      var sql = "INSERT INTO mensagens (textomsg) VALUES (lastMsg)";
      con.query(sql, function (err, result) {
        if (err) throw err;
        console.log("1 record inserted");
      });
    });