Question

我在yii2中仍然是新人。

所以，制作一个在yii2中使用MVC的简单项目，其中项目是输出检查结果。

让我烦恼的是，如何在数据库中找不到数据时重定向到主页？

另一个，我得到Undefined offset: 0我用Google搜索说mismatch array和data not NULL。

无论如何，这些是代码：

controller：StudentController.php

public function actionCall()
{         

    $result = $_POST['semester'];
    $result_explode = explode('|', $result);

    $sem = $result_explode[0];
    $tahun = $result_explode[0]." ".$result_explode[1];

    $send = array(
        'id' => $_POST['id'],
        'semester' => $sem ,
        'tahun' => $tahun);

    $model = new Student();


    if(!$data['result']= $model->getDetails($send))
    {
        return $this->render('detail', $data);
    }
    else
    {
        return $this->render('detail');
    }


}

public function actionSearch()
{         

    return $this->render('searchstudent2');
}

型号：Student.php

public function getDetails($send)

{

$student = student::find()
       ->select('s.student_name,al.level_matric_no,al.level_semester,al.level_id,s.student_mykad, s.student_address,s.student_postcode,
        s.student_state,ss.subject_code,ss.subject_name,ss.subject_credit_hour,c.course_name,st.taken_session,
        g.Grade_symbol,g.Grade_value,sr.semester_gpa,sr.semester_cgpa,sr.total_point,
        sr.total_credit, sr.semester_count')
       ->from('student AS s')
       ->leftJoin('a_level AS al', '`s`.`student_id` = `al`.`student_id`')
       ->leftJoin('subject_taken AS st', '`al`.`level_id` = `st`.`level_id`')
       ->leftJoin('semester_result AS sr', '`al`.`level_id` = `sr`.`level_id`')
       ->leftJoin('grade AS g', '`g`.`grade_id` = `st`.`grade_id`')
       ->leftJoin('course AS c', '`al`.`level_course_offered` = `c`.`course_id`')
       ->leftJoin('subject AS ss', '`ss`.`subject_id` = `st`.`subject_id`')
       ->where(['al.level_id'=>$send['id']])
       ->andWhere(['sr.semester_count'=>$send['semester']])
       ->andWhere(['st.taken_session'=>$send['tahun']])
       ->asArray()
       ->all();

       return $student;

 }

查看：searchstudent2.php

<div class="container">
<div class="row">
    <h2>Stylish Search Box</h2>
       <div id="custom-search-input">
       <?php $form = ActiveForm::begin(['action' => Url::to(['student/call']),'options' => ['method' => 'post']]) ?>
                        <div class="input-group col-md-12">
                                <select name="semester">
                                    <option value="1|2012/2013">sem1</option>
                                    <option value="2|2013/2014">sem2</option>
                                    <option value="3|2014/2015">sem3</option>
                                    <option value="4|2015/2016">sem4</option>
                                </select>

                                <br><br>
                            <input type="text" name="id" class="search-query form-control" placeholder="Search" />
                            <span class="input-group-btn">
                                <button class="btn btn-danger" type="submit">
                                    <span class=" glyphicon glyphicon-search"></span>
                                </button>
                            </span>
                        </div>
                    <?php ActiveForm::end() ?>
                    </div>
</div>

detail.php

表1详细说明.php

<table style="width:100%">
<tr>
  <th class="tg-yw4l">Nama</th>
  <th class="tg-baqh" colspan="7"><?php echo $result[0]['student_name']; ?></th>
</tr>
<tr>
  <td class="tg-yw4l">Alamat</td>
  <td class="tg-baqh"><?php echo $result[0]['student_address']; echo "&nbsp;". $result[0]['student_postcode']; echo "&nbsp;".$result[0]['student_state'];?></td>
  <td class="tg-yw4l" rowspan="4"></td>
  <td class="tg-yw4l">Kemasukan</td>
  <td class="tg-baqh"></td>
  <td class="tg-yw4l" rowspan="4"></td>
  <td class="tg-yw4l" colspan="2"></td>
</tr>
<tr>
  <td class="tg-yw4l">No. KP</td>
  <td class="tg-baqh"><?php echo $result[0]['student_mykad']; ?></td>
  <td class="tg-yw4l">Sesi</td>
  <td class="tg-baqh"><?php echo $result[0]['taken_session']; ?></td>
  <td class="tg-yw4l">Tahun Akademik</td>
  <td class="tg-yw4l"><?php echo $result[0]['taken_session']; ?></td>
</tr>
<tr>
  <td class="tg-yw4l">No. Matrik</td>
  <td class="tg-baqh"><?php echo $result[0]['level_matric_no']; ?></td>
  <td class="tg-yw4l">Fakulti</td>
  <td class="tg-baqh"></td>
  <td class="tg-yw4l" colspan="2" rowspan="2"></td>
</tr>
<tr>
  <td class="tg-yw4l">Program</td>
  <td class="tg-baqh"><?php echo $result[0]['course_name']; ?></td>
  <td class="tg-yw4l">Semester</td>
  <td class="tg-baqh"></td>
</tr>
<tr>
  <td class="tg-yw4l">Pinjaman</td>
  <td class="tg-baqh" colspan="7"></td>
</tr>

表2详细说明.php

    <tr>
      <th class="tg-031e">BIL</th>
      <th class="tg-031e">KOD</th>
      <th class="tg-031e">SUBJEK</th>
      <th class="tg-yw4l">KREDIT</th>
      <th class="tg-yw4l">GRED</th>
      <th class="tg-yw4l">MATA</th>
      <!-- <th class="tg-yw4l">GPA/CGPA</th> -->
    </tr>

    <?php 
   $bil=0;
   foreach ($result as $details) {
       $bil++;


    ?>
    <tr>
      <td class="tg-031e"><?=$bil?></td>
      <td class="tg-031e"><?php echo $details['subject_code']; ?></td>
      <td class="tg-031e"><?php echo $details['subject_name']; ?></td>
      <td class="tg-yw4l"><?php echo $details['subject_credit_hour']; ?></td>
      <td class="tg-yw4l"><?php echo $details['Grade_symbol']; ?></td>
      <td class="tg-yw4l"><?php echo $details['Grade_value']; ?></td>


    </tr>
     <?php } ?>
    <tr>
      <td class="tg-031e" colspan="2"></td>
      <td class="tg-031e">TOTAL KREDIT</td>
      <td class="tg-yw4l"><?php echo $details['total_point']; ?></td>
      <td class="tg-yw4l">JUMLAH JAM KREDIT</td>
      <td class="tg-yw4l" colspan="3"><?php echo $details['total_credit']; ?></td>
    </tr>

Answer 1

逐个尝试以下步骤

检查$ _POST [＆＃39; semester＆＃39;]并确保它不为空
检查$ model-＆gt; getDetails（$ send）是否返回任何结果。

注意：find（） - ＆gt; ... asArray（） - ＆gt; all（）如果找不到结果则返回一个空数组。所以在渲染视图之前检查空结果。

if( !empty($data=$model->getDetails($send)) )
{
    return $this->render('detail', ['viewData'=>$data]);
}
else
{
    return $this->render('_another_view');
    // or redirect to some page or do whatever

}

注意：如果您将空的$ data数组发送到视图，并且您使用$ data [0] [＆＃39;任何＆＃39;] 你会得到Undefined offset：0错误。因此，如果结果为空，则渲染另一个视图。在你的情况下，你正在渲染相同的视图＆＃39;细节＆＃39;另一个没有$ data的$ data。因此很有可能获得Undefined offset：0 error。

由于

Answer 2

如果 getDetails 函数没有返回数据，请重定向到主页：

if ( ($data = $model->getDetails($send)) != null ) {

  return $this->render('detail', ['result' => $data]);

} else {
   // redirect no data
   return $this->redirect(['site/index']);
}

重定向到yii2中的错误页面

2 个答案: