Question

嗨我在查看以下代码显示任何结果时遇到问题。

控制器：

   $datedue = 2011-01-27;
  $username = $this->tank_auth->get_username();
  $sql = "SELECT taskid FROM relationships WHERE username = ? AND datedue = ?"; 
  $tasks = $this->db->query($sql, array($username, $datedue));
  $count = 0;
      $taskdetails = array();

  foreach($tasks->result() as $row)
  {

   $taskid = $row->taskid;

    $subsql = "SELECT * FROM tasks WHERE id = ?"; 
    $taskdetails[$count] = $this->db->query($subsql, array($taskid));
    $count++;
  }

  $data['taskdetails'] = $taskdetails;
  $data['total'] = $count;

  $this->header();
  $this->load->view('dashboard', $data);

查看：

    <?php 

 foreach($taskdetails as $entry)
   {
  foreach($entry->result() as $row)
  {
   echo $row->name;
  }

   }

?>

任何帮助都会非常感谢。

Answer 1

您的视图未显示内容的原因是因为您的查询不完全正确。

 $datedue = 2011-01-27;

应该用引号括起来，因为日期是一个字符串。

 $datedue = "2011-01-27";

另外，你没有正确地遵循MVC的概念。所有数据库查询和结果都应该在模型内部进行。以及Controller内部的所有数据处理。

Controller和View应该处理任何数据库连接，这是模型的职责。因此，我建议创建一个Model并将所有Database查询放在一个或两个函数中。然后，Controller将调用这些函数并接收数据。然后它应该操纵它并将其传递给一个干净的视图（我的意思是，视图应该永远不会调用result()

以下是您应该如何构建代码：

<强> CONTROLLER

class Tasks extends Controller {

function Tasks ()
{
    parent::Controller();   
    $this->load->model('tasks_model');
    $this->load->database();
}

function index()
{
  $datedue = "2011-01-27";
  $username = $this->tank_auth->get_username();

  $tasks = $this->tasks_model->getTasks($username, $datedue);


  $count = count($tasks);


  $data['taskdetails'] = $tasks;
  $data['total'] = $count;

   $this->header();
  $this->load->view('dashboard', $data);
}
}

<强> MODEL

class Tasks_model extends Model {


    function Tasks_model()
    {
        // Call the Model constructor
        parent::Model();
    }

    function getTasks($username, $datedue) {
        $sql = "SELECT taskid FROM relationships WHERE username = ? AND datedue = ?"; 
        $tasks = $this->db->query($sql, array($username, $datedue));

        $taskdetails = array();

        foreach($tasks->result() as $row){

            $taskid = $row->taskid;

            array_push( $taskdetails, $this->getTasksDetails( $taskid ) );
        }

        return $taskdetails;
    }

    function getTasksDetails($taskid) {

        $subsql = "SELECT * FROM tasks WHERE id = ?"; 
        $taskdetails = $this->db->query($subsql, array($taskid));

        return $taskdetails->row();


    }


}

查看：

foreach($taskdetails as $task) { echo $task->name; }

Answer 2

验证您的任务表是否包含名称字段

查看

foreach($taskdetails as $entry) { foreach($entry->result() as $row) { echo $row[0]; } }

为什么要在此行传递数组

$ taskdetails [$ count] = $ this-＆gt; db-＆gt; query（$ subsql，array（$ taskid））;

改为写

$ taskdetails [$ count] = $ this-＆gt; db-＆gt; query（$ subsql，$ taskid）;

CodeIgniter将带有查询的数组传递给视图

2 个答案: