如何根据提交按钮更新字段 - Yii

我是Yii框架的新手。我必须在表单中创建三个按钮（update.php）。即（保存、批准、拒绝）。我在表单中使用以下字段。

<?php
/* @var $this MessageTemplateController */
/* @var $model MessageTemplate */
/* @var $form CActiveForm */
?>
<div class="form">
<?php $form=$this->beginWidget('CActiveForm', array(
    'id'=>'message-template-form',
    'enableAjaxValidation'=>false,
)); ?>

    <?php
        echo $form->errorSummary($model); 
        ?>
    <div class="row">
        <?php //$model->ReviewedDate=date('Y-m-d H:i:s');?>
        <?php echo $form->labelEx($model,'ReviewedDate'); ?>
        <?php echo $form->textField($model,'ReviewedDate',array('value'=>'0000-00-00 00:00:00','readonly' => true)); ?>
        <?php echo $form->error($model,'ReviewedDate'); ?>
    </div>
    <div class="row">
        <?php echo $form->labelEx($model,'SmsText'); ?>
        <?php echo $form->textArea($model,'SmsText',array('size'=>60,'maxlength'=>255)); ?>
        <?php echo $form->error($model,'SmsText'); ?>
    </div>
    <div class="row">
        <?php echo $form->labelEx($model,'UpdatedDate'); ?>
        <?php echo $form->textField($model,'UpdatedDate'); ?>
        <?php echo $form->error($model,'UpdatedDate',array('value'=>date('Y-m-d H:i:s'),'readonly' => true)); ?>
    </div>
    <div class="row">
    <?php echo $form->labelEx($model,'Approved'); ?>
            <?php echo $form->hiddenField($model, 'Approved'); ?>
    <?php echo $form->error($model,'Approved'); ?>
</div> 
<div class="row">
<div class="row">
            <?php echo $form->labelEx($model_al, 'username'); ?>
            <?php $identity=Yii::app()->user->name;?>
        <?php echo $form->textField($model_al, 'username',array('value'=>$identity,'readonly' => true), array('size' => 60, 'maxlength' => 250)); ?>
        <?php echo $form->error($model_al, 'username'); ?>
        <div>

         <div class="row">        
        <?php echo $form->labelEx($model_al, 'updatedtime'); ?>            
        <?php echo $form->textField($model_al, 'updatedtime',array('value'=>date('Y-m-d H:i:s'),'readonly' => true), array('size' => 60, 'maxlength' => 250)); ?>
        <?php echo $form->error($model_al, 'updatedtime'); ?>
        <div>
         <div class="row">        
        <?php echo $form->labelEx($model_al, 'comments on approval/rejection'); ?>            
        <?php echo $form->textField($model_al, 'comments',array('size' => 60, 'maxlength' => 250)); ?>
        <?php echo $form->error($model_al, 'comments'); ?>
        <div>
    <div class="row buttons">

            <?php echo CHtml::submitButton('Save', array('name' => 'save')); ?>
                <? echo '&nbsp;&nbsp;&nbsp;'; ?>
<?php echo CHtml::submitButton('Accept', array('name' => 'accept')); ?>
                <? echo '&nbsp;&nbsp;&nbsp;'; ?>
<?php echo CHtml::submitButton('Reject', array('name' => 'reject')); ?>
    </div>
<?php $this->endWidget(); ?>
</div><!-- form -->

现在我已经创建了三个按钮。在上面的形式中，有一个名为approved的字段。我希望在单击以下按钮时执行此操作：
1. Save - All fields have to be saved but not approved(keep it as default).
2. Accept - All fields have to be saved with Approved changing to 1 in database.
3. Reject - All fields have to be saved with Approved changing to 0 in database.

我该怎么做。

编辑我已经在我的控制器中添加了以下内容。

public function actionUpdate($id)
    {       
                $model_mt=new Messagesintable;   
                $model_al=new AuditLogin;                
        $model=$this->loadModel($id);
        // Uncomment the following line if AJAX validation is needed
        // $this->performAjaxValidation($model);
                 if(isset($_POST['MessageTemplate']) && isset($_POST['AuditLogin']))
                  {                     

                    $model->attributes=$_POST['MessageTemplate'];                                      
                    list($name,$mobile,$email)=retrieve_persondetails($id); 
                      if($model->save())
                      {
                        $model_al->attributes=$_POST['AuditLogin'];                     
                                             if ($model_al->save())
                         $this->redirect(array('admin','id'=>$model->Id));
                      }
                  }
$this->render('update',array(
'model'=>$model,
)); 
}