Is it possible local variable value store as a instance var

Hi i want to display the function value to outside of the function only using variables.

I have a sql query function. I am getting the one value and stored in a variable. Now i want to this value stored in instance variable and display.

 

Note: I dont want using another function. only local variable value stored as a instance varible .Ho to solve this.

 

Iam using node.js code ::

 

if (intent.intent==='Sales-1'){

var rsp;

con.query('SELECT Mobiles from Salestb' , function (err,rows,field) {

if(err) {

throw err;

} else {

var value = (rows[0].Mobiles);

rsp =value;

}

});

console.log(rsp);

}