php - Duplicate entry '' for key 2 -


here php code gives me "duplicate entry '' key 2" error...

<?php  $host = "localhost";  $user = "admin";  $pass = "123"; $connection = mysql_connect($host,$user,$pass) or die (mysql_errno().": ".mysql_error()."<br>");      $userid=  mysql_real_escape_string($_post['userid']); $latitude=  mysql_real_escape_string($_post['latitude']); $longitude=  mysql_real_escape_string($_post['longitude']); //$time=  mysql_real_escape_string($_post['time']);   $db_select=mysql_select_db("new"); if(!$db_select){     die(mysql_error());     echo "error"; }  $query= "insert location(userid, latitude, longitude ) values ('{$userid}', '{$latitude}', '{$longitude}'); " ;  if($medo=mysql_query($query)){     header("localhost/filename");     exit; }else{     echo"<p> error</p>";     die(mysql_error()); }

i don't think there problem code. please help.

as suppose you'll want update if present, use syntax mysql request :

$query= "insert location (userid, latitude, longitude ) values ('{$userid}', '{$latitude}', '{$longitude}')  on duplicate key update latitude='{$latitude}', longitude='{$longitude}';";

so when user exist, updated new coordinates


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