[英]How to remove redundant data in table from SQL query with join in codeigniter
控制器:
class adminpanel extends CI_Controller {
public function __construct() {
parent::__construct();
$this->load->model('login_database');
}
public function index() {
$data['h'] = $this->login_database->load_orders();
$this->load->view('admin_page', $data);
}
}
模型:
public function load_orders(){
$this->db->select('*');
$this->db->from('orders');
$this->db->join('order_detail', 'orders.serial = order_detail.orderid');
$this->db->join('customers', 'orders.customerid = customers.serial');
$this->db->order_by('date','DESC');
$query = $this->db->get();
$result = $query->result();
return $result;
}
}
视图:
<table border="1" cellpadding="5px" cellspacing="1px" bgcolor="#FFFFFF">
<tbody>
<tr>
<td>Date</td>
<td>Delivery Time</td>
<td>Meal Name</td>
<td>Quantity</td>
<td>Customer Name</td>
<td>Phone</td>
<td>Location</td>
<td>Address</td>
<td>Payment Method</td>
</tr>
<?php foreach ($h as $row) { ?>
<tr>
<td><?php echo $row->date;?></td>
<td><?php echo $row->time;?></td>
<td><?php echo $row->prodname;?></td>
<td><?php echo $row->quantity;?></td>
<td><?php echo $row->name;?></td>
<td><?php echo $row->phone;?></td>
<td><?php echo $row->location;?></td>
<td><?php echo $row->address;?></td>
<td><?php echo $row->payment;?></td>
</tr>
<?php } ?>
</tbody>
</table>
返回的桌子上有太多冗余数据,例如,一位顾客订购了许多不同的饭菜。 它在订购的饭菜上一遍又一遍地显示相同的客户名称。 如何消除这种情况并在表格中显示?
请帮忙。
尝试像这样修改您的查询,我使用了左联接和右联接。
$this->db->select('*');
$this->db->from('orders');
$this->db->join('order_detail', 'orders.serial = order_detail.orderid', 'left');
$this->db->join('customers', 'orders.customerid = customers.serial', 'right');
$this->db->order_by('date','DESC');
$query = $this->db->get();
$result = $query->result();
return $result;
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