CodeIgniter join() 不显示逗号分隔值

Question

我正在使用 CodeIgniter，但我遇到了 join 方法的问题。

我希望通过 service_id 来自db_services 表的服务，该服务也存储在db_orders 中的同一列名称service_id 中，我将service_id 作为db_services 表中的主键。

现在用户通过单击所需服务的复选框在implode() 函数的帮助下添加服务，该函数将数据正确放入数据库db_orders 表中service_id 列下，即1,2,3,5

现在，当我从 db_orders 检索数据时，我从数据库中得到逗号分隔的值，当我在 Order_model -> view_orders() 函数中删除此行 $this->db->join( $this->db->dbprefix('db_services'), $this->db->dbprefix('db_services').'.service_id = '.$this->db->dbprefix('db_orders').'.service_id' ); 时，它工作正常，但当我添加该行仅显示一条记录（第一条记录），例如，如果插入了两 (2) 个 service_id，所以我只得到我猜是在数据库期间插入的第一个数字的那个。

<?php $services = explode(",", $value->service_id);
foreach ( $services as $service ): ?>
<a href="" class="btn btn-success btn-flat btn-xs"><?php echo $service; ?></a>
<?php endforeach; ?>

这是我已经解决的问题，但实际问题是当我使用join table 方法它不起作用让我复制粘贴我的代码，这可以帮助你更好地解决问题我已经提到了每一个小细节，如果您需要更多，我可以进一步详细说明。

Order_model -> view_orders()

<?php
public function view_orders()
{
    $this->db->select( '*' );
    $this->db->from( $this->db->dbprefix('db_orders') );
    $this->db->join( $this->db->dbprefix('db_order_status'), $this->db->dbprefix('db_order_status').'.order_status_id = '.$this->db->dbprefix('db_orders').'.order_status_id' );
    $this->db->join( $this->db->dbprefix('db_users'), $this->db->dbprefix('db_users').'.user_id = '.$this->db->dbprefix('db_orders').'.user_id' );
    $this->db->join( $this->db->dbprefix('db_services'), $this->db->dbprefix('db_services').'.service_id = '.$this->db->dbprefix('db_orders').'.service_id' );
    $query = $this->db->get();
    return $query->result();
}
?>

订单控制器 -> index()

public function index()
{
    $data['orders'] = $this->order->view_orders();
    $data['title'] = "View All Orders";
    $this->load->template('orders/view_all_orders', $data);
}

orders/view_all_orders.php

<?php
$services = explode(",", $value->service_id);
foreach ( $services as $service ): ?>
<a href="" class="btn btn-success btn-flat btn-xs"><?php echo $service; ?></a>
<?php endforeach; ?>

Answer 1

好吧，这就是我提供的解决方案。

通过删除这一行来调整我的功能 -> //$this->db->join( $this->db->dbprefix('db_services'), $this->db->dbprefix('db_services').'.service_id = '.$this->db->dbprefix('db_orders').'.service_id' );

public function view_orders()
{
  $this->db->select( '*' );
  $this->db->from( $this->db->dbprefix('db_orders') );
  $this->db->join( $this->db->dbprefix('db_order_status'), $this->db->dbprefix('db_order_status').'.order_status_id = '.$this->db->dbprefix('db_orders').'.order_status_id' );
  $this->db->join( $this->db->dbprefix('db_users'), $this->db->dbprefix('db_users').'.user_id = '.$this->db->dbprefix('db_orders').'.user_id' );
  //$this->db->join( $this->db->dbprefix('db_services'), $this->db->dbprefix('db_services').'.service_id = '.$this->db->dbprefix('db_orders').'.service_id' );
  $query = $this->db->get();
  return $query->result();
}

我在 Order_model 下创建了另一个函数 -> get_services() 如下。

public function get_services()
{
    $query = $this->db->get( $this->db->dbprefix('db_services') );
    return $query->result();
}

现在我的控制器看起来像这样

public function index()
{
  $data['get_services'] = $this->order->get_services(); // added this line to get all services and show it view by respective id
  $data['orders'] = $this->order->view_orders();
  $data['title'] = "View All Orders";
  $this->load->template('orders/view_all_orders', $data);
}

我现在的视图是这样的。

<?php foreach( $orders as $order ): ?>
  <tr>
    <td><a href="/orders/view/<?php echo $order->order_id; ?>"><?php echo $order->order_id; ?></a></td>
    <td><?php echo $order->status; ?></td>
    <td>
      <a href="/user/view/<?php echo $order->user_id; ?>"><?php echo $order->name;?></a>
    </td>
    <td>
      <?php
        $service_ids = explode(',', $order->service_id);
        foreach ($service_ids as $service_id) {
          foreach ($get_services as $row) {
            if ($service_id == $row->service_id) {
              echo $row->service_name;
            }
          }
        }
      ?>
    </td>
    <td><?php echo gmdate('l jS F, Y',$order->created); ?></td>
    <td>
      <a class="btn btn-xs btn-flat btn-info" href="/orders/view/<?php echo $order->order_id; ?>"><i class="fas fa-eye"></i></a>
      <a class="btn btn-xs btn-flat btn-success" href="/orders/edit/<?php echo $order->order_id; ?>"><i class="fas fa-edit"></i></a>
      <a class="btn btn-xs btn-flat btn-danger" href="/orders/delete/<?php echo $order->order_id; ?>"><i class="fas fa-trash"></i></a>
    </td>
  </tr>
<?php endforeach; ?>

就这帮助我解决了我的问题，但我仍然很困惑我是否遵循正确的方向