[PHP] สอบถามการเขียนนับจำนวนที่คลิกปุ่มโหวตใน sql ว่าเขียนยังไง

<?php
$conn = mysqli_connect($servername, $username, $password ,$dbname);
$db_query= "SELECT * FROM vote";
$sql= "INSERT INTO vote (vote_id,v_pos,v_neg)VALUES (0,0,0)";
if ($db_query = mysqli_query($conn,$db_query)) {

$vote = mysqli_fetch_array($db_query);
$vote = 0;
$vote_new = $vote+1;

//echo $vote_new ;
$sql_update = "update vote set  $v_pos  = $vote_new ";
$query_up = mysqli_query($conn,$sql_update);
//echo "<meta http-equiv=\"refresh\" content=\"2;url=index.php\">";
$query_up = mysqli_query($conn,$sql_update);  
//}
 mysqli_close($conn);
}
?>