Zend Framework:如何取消设置Zend_Db_Table_Rowset对象中的数据行

$rowset = $table->fetchAll();
foreach ($rowset as $row) {
    $row->delete();
}

$rowset = $table->fetchAll();
foreach ($rowset as $row) {
    $row->delete();
    $row->save();
}

$rowset = $table->fetchAll();
foreach ($rowset as $row) {
    $row->delete();
    $row->save();
    $rowset->removeRow($row);
}

$rowset = $table->fetchAll();
foreach ($rowset as $row) {
    $row->delete();
    $row->save();
    $rowset->removeRow($row);
    $rowset->rewind();
}