Question

如何在Codeigniter中从db获取分层数据。我看了这个： http://www.sitepoint.com/hierarchical-data-database/ 我做得很好，但我不能用我的模型，控制器和视图来优化本教程

 Default Category
   |----- Sub category
          | ----One more category
               |----- Somthing else

我尝试但不显示子类别：

我的模特：

   public function fetchChildren($parent, $level) {    
       $this->handler = $this->db->query("SELECT * FROM content_categories WHERE parent_id='".$parent."' ");
          foreach($this->handler->result() as  $row ) {
              $this->data[$row->id] = $row;
              //echo str_repeat('  ',$level).$row['title']."\n"; 
          }

          return $this->data;

}

控制器：

  $this->data['node'] = $this->categories_model->fetchChildren(' ',0);

查看：

<table class="module_table">
    <thead>
        <tr>
             <th><?php echo lang('categories_table_title'); ?></th>     
        </tr>
    </thead>

    <tbody>
        <?php foreach ($node as $row) : ?>
        <tr>
            <th> <?php echo str_repeat('|----', 0+1). $row->title ?> </th>
        </tr>
        <?php endforeach; ?>
    </tbody>

</table>

输出是：

----Default
----Default
----Test Category 1
----Seccond Test Category 1
----Another Test Category 1

当我在模型中执行此操作时，所有工作正常但当我尝试在控制器中调用并在视图中循环时，我的结果如上所示：

这项工作onlu in model：

   public function fetchChildren($parent, $level) {    
       $this->handler = $this->db->query("SELECT * FROM content_categories WHERE parent_id='".$parent."' ");
          foreach($this->handler->result() as  $row ) {
             echo str_repeat('|-----',$level).$row->title."\n"; 
            $this->fetchChildren($row->title, $level+1);
          }

          return $this->data;

}

就像输出一样：

Default
    |----Test Category 1
    |----Seccond Test Category 1
        |----Another Test Category 1

任何人都有解决方案或示例谢谢。

Answer 1

尝试存储每个类别的级别值。

在你的模特中：

public function fetchChildren($parent, $level){
    $this->handler = $this->db->query("SELECT * FROM content_categories WHERE parent_id='".$parent."' ");
    foreach($this->handler->result() as  $row ) {
        $row->level = $level;
        $this->data[] = $row; 
        $this->fetchChildren($row->title, $level+1);
    }
    return $this->data;
}

在您的控制器中：

$this->data['node'] = $this->categories_model->fetchChildren(' ',0);

在你看来

<table class="module_table">
    <thead>
        <tr>
             <th><?php echo lang('categories_table_title'); ?></th>     
        </tr>
    </thead>
    <tbody>
        <?php foreach ($node as $row) : ?>
        <tr>
            <th><?php echo str_repeat('|----', $row->level). $row->title ?> </th>
        </tr>
        <?php endforeach; ?>
    </tbody>
</table>

Codeigniter从数据库中获取嵌套的分层数据

1 个答案: