/Javascript/Node.js/Node js check if a user exists in mysql

Node js check if a user exists in mysql

connectDB.query("SELECT ACCOUNT_ID FROM registration WHERE ACCOUNT_ID = '"+ userAccnt +"'", function(err, result, field){
     if(result.length === 0){
        //new user logic
}else{  
    //existing user, redirect to another page 
 }
        }

Source: stackoverflow.com

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