将两个不同的sem分隔成不同的表格

Question

我想知道如何从我的模型中调用两个数据。为了解释更加进一步，我想这样的事情发生，这是我的模型：

function result_getGrades($studentid) 
     { 

      $sql= " 
        SELECT g.studentid, sb.subjectcode, s.description, g.final,sb.sem,sb.sy 
        FROM grades g 

        JOIN subjectblocking sb ON g.blockcode=sb.blockcode 

        JOIN subjects s ON sb.subjectcode=s.subjectcode 

        WHERE g.studentid='$studentid' 
        ORDER BY sb.sem ASC, sb.sy ASC; 


        "; 
      $result = $this->db->query($sql); 
      $result = $result->result(); 
      return $result; 
     } 

和本所认为：

<div class="col-md-10"> 
    <div class="well"> 
      <table class="table"> 

       <thead> 
        <th>Subject Code</th> 
        <th>Description</th> 
        <th>Sem</th> 
        <th>School Year</th> 
        <th>Grade</th> 
       </thead> 
     <?php foreach ($query as $row){ ?> 
        <tr> 
         <td><?php echo $row->subjectcode;?><br></td> 
         <td><?php echo $row->description;?><br></td> 
         <td><?php echo $row->sem;?><br></td> 
         <td><?php echo $row->sy;?><br></td> 
         <td><?php echo $row->final;?><br></td> 
        </tr> 

     <?php } ?> 
      </table> 

这是怎么样子，你可以看到它是一个表，我想分开具有不同sem的表，我该怎么做？

Answer 1

您可能必须从传统的foreach循环偏离，并做一些while循环，如下所示（下面的代码是未经测试）：

<?php 
while($row = current($query)) { 
    // Echo the table HTML 
    ?> 
<table class="table"> 
    <thead> 
     <th>Subject Code</th> 
     <th>Description</th> 
     <th>Sem</th> 
     <th>School Year</th> 
     <th>Grade</th> 
    </thead> 
    <tbody> 
    <?php 
    // Loop for all the same "sem"s 
    do { 
     // Echo the HTML 
     ?> 
     <tr> 
      <td><?php echo $row->subjectcode;?><br></td> 
      <td><?php echo $row->description;?><br></td> 
      <td><?php echo $row->sem;?><br></td> 
      <td><?php echo $row->sy;?><br></td> 
      <td><?php echo $row->final;?><br></td> 
     </tr> 
     <?php 
     // Set the pointer the the next value in the array and fetch the row 
     $nextRow = next($query); 
     // If the next row exists, get the "sem" that's next 
     if($nextRow) { 
      $nextSem = $nextRow->sem; 
     } 
     else { 
      $nextSem = null; 
     } 
    } 
    // Loop while the upcoming "sem" is the same as the one we just printed 
    while($nextSem === $row->sem); 
    // Echo the end of the table body 
    ?> 
    </tbody> 
</table> 
    <?php 
} 

另一种选择是用foreach循环坚持。但是如果“sem”不同，有条件地预先添加/追加<table>标签。