$table = "dtb_customer_reading";
$where = "customer_id = ? ";
$arrval[] = $objCustomer->getValue('customer_id');
//顧客の閲覧商品数
$rpcnt = $objQuery->count($table, $where, $arrval);

//閲覧数が設定数以下
if ($rpcnt < CUSTOMER_READING_MAX){
//閲覧履歴に新規追加
lfRegistReadingData($tmp_id, $objCustomer->getValue('customer_id'));
} else {
//閲覧履歴の中で一番古いものを削除して新規追加
$oldsql = "SELECT MIN(update_date) FROM ".$table." WHERE customer_id = ?";
$old = $objQuery->getone($oldsql, array($objCustomer->getValue("customer_id")));
$where = "customer_id = ? AND update_date = ? ";
$arrval = array($objCustomer->getValue("customer_id"), $old);
//削除
$objQuery->delete($table, $where, $arrval);
//追加
lfRegistReadingData($tmp_id, $objCustomer->getValue('customer_id'));
}