/**
* Returns an object representing the summary row
*
* @param array $fields Associative array mapping columns to SQL queries
*
* @return mixed An object containing the necessary fields, or NULL
* if no summary row is defined
*/
function get_row_object($fields) {
global $DB;
$found = false;
$result = new stdClass;
foreach ($fields as $field) {
$effective_field = table_report::get_object_index($field);
if (array_key_exists($field, $this->mapping)) {
$result->$effective_field = $DB->get_field_sql($this->mapping[$field][0], $this->mapping[$field][1]);
$found = true;
} else {
//empty field value
$result->$effective_field = '';
}
}
if ($found) {
return $result;
} else {
//no columns have summaries
return NULL;
}
}
