public function search($value, $operator = '=')
{
if ($this->isEmpty($value)) {
return '';
}
$prefix = '';
if (substr($operator, 0, 1) == '!') {
$prefix = 'NOT ';
$operator = substr($operator, 1);
}
return $prefix . '(' . $this->getFieldName() . ' ' . $operator . ' ' . $this->db->quote($value) . ')';
}