node js check if a user exists in mysql

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Allison
02 Aug 2017
1connectDB.query("SELECT ACCOUNT_ID FROM registration WHERE ACCOUNT_ID = '"+ userAccnt +"'", function(err, result, field){
2     if(result.length === 0){
3        //new user logic
4}else{  
5    //existing user, redirect to another page 
6 }
7        }
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