private function getLoadKey(array $loadColumns = array())
{
$rowKey = array();
if (is_array($loadColumns) && count($loadColumns)) {
foreach ($loadColumns as $columnName) {
$rowKey[] = $this->table->getColumn($columnName);
}
} else {
foreach ($this->tableColumns as $index => $column) {
if ($this->getInternalValue($column->name) !== null) {
$rowKey[$column->name] = $column;
}
}
}
return $rowKey;
}
