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problem with ajax and sql insert

<?php if (!defined('BASEPATH')) exit('No direct script access allowed');

class Insertquery_model extends CI_Model

function __construct()

function insertquery($query_terms, $table)

$dsn = $this->session->userdata('dsn');
$DB1 = $this->load->database($dsn, TRUE);

$fields = '';
$binding = '';

  foreach($query_terms as $key => $value)
  $values[] = $value;
  $fields .= $key.",";
  $binding .= '?,';

//remove the last comma
$fields = rtrim($fields,',');
$binding = rtrim($binding,',');

$sql = "INSERT INTO $table ($fields) VALUES ($binding)";
$DB1->query($sql, $values);
//return $DB1->last_query();
return $DB1->insert_id();
}//end method

}//end class

This works normally. For example when I submit a form with userdata, the data is inserted into the database.

However when I do an ajax call the sql query does not initiate.
I have tested each peice of information by returning it to the ajax function and echo-ing to the screen to make sure all the info is going through cleanly. Besides, the array $query_terms is constructed the same way (and by the same code) as it is when i submit the form in the normal way.

So, my question is:
Is there something I am missing when trying to use a model from an ajax call?

Thanks :-)

feel very silly :-)

i had a database field that doesnt accept null values.....
one of the values in the $query_terms array was null
[embarassed smiley goes here]

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