/**
* 删除id指向的记录
* @param $id
* @return unknown_type
*/
public function delete($id = null)
{
$this->setId($id);
if ($this->_id === null) {
throw new Hi_Db_Table_Exception("需要被删除行的id");
}
$cond = $this->_table->getCondition();
$cond->add($this->_primaryKey, $this->_id);
$this->_table->delete();
}
