php - How to debug UPDATE execution in mysqli driver -

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i've looked on lot of posts, still can't figure why simple update failing affect database:

$con = mysqli_connect("localhost", "username", "password", "database"); // check connection if (mysqli_connect_errno()) {     echo "failed connect mysql: " . mysqli_connect_error(); }   $quantityarray = array();  foreach ($_post $key => $value) {     $quantityarray[$key] = $value; }  foreach ($quantityarray $key => $value) {     $value = mysqli_real_escape_string($con, $value); }  foreach ($quantityarray $key => $value) {     $query = "update inventory set quantity = $value uniqueid = $key";  echo "<br /><br / >" . $query . "<br /><br / >";      $result = mysqli_query($con, $query);  echo "<br /><br / >" . $result . "<br /><br / >";  }

when script called, $_post array of unique ids keys , quantities values (both of integer values). i've tested , confirmed that, yes, appropriate keys , values being passed, why isn't working mystery me.

update: $result returns nothing @ all

thank help!

from comments we've got simple solution: mysqli_error( $con ); helped figure out default user right not enough perform update operations specified table. adding new user appropriate rights solved issue.


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