Codeigniter 逻辑运算符

Question

我在没有得到更多回复之前提出了这个问题，如果这有帮助的话，我决定重新发布它。我希望我重新发帖没有做错什么？

$total_cost_for_A = $this->admin_model->total_cost_for_A($branch, $department, $date);
$total_cost_for_B = $this->admin_model->total_cost_for_B($branch, $department, $date);

变量 $total_cost_for_A 和 $total_cost_for_B 保存模型中 mysql 求和查询的返回值。如果未找到记录，查询将返回 false。现在，我正在尝试执行此操作。

if(($total_cost_for_A === FALSE) && ($total_cost_for_B === FALSE))
{
  $data['no_record'] = 'No Record Found!';
  $this->load->view('admin/bookings', $data);
}
else
{
    $this->load->view('admin/summary', $data);
}

这个测试总是失败并执行else语句，这不是什么。任何帮助将不胜感激。谢谢

功能如下

    function total_cost_for_A($branch, $department, $date)
    {
        if($branch == 'Head Office' && $department == 'Summary')
        {
            $select_amount_paid = 'SELECT SUM(total_amount) total_amount FROM graphics_booking AS bk
            WHERE bk.date = "'.$date.'"';
        }

        $result = $this->db->query($select_amount_paid);

        if($result->num_rows() > 0)
        {
            return $result;
        }
        else
        {
            return FALSE;
        }
    }


    function total_cost_for_B($branch, $department, $date)
    {
        if($branch == 'Head Office' && $department == 'Summary')
        {
            $total_LF_amount = 'SELECT SUM(total_amount) total_amount FROM large_format_print
            WHERE date = "'.$date.'"';
        }

        $result = $this->db->query($total_LF_amount);

        if($result->num_rows() > 0)
        {
            return $result;
        }
        else
        {
            return FALSE;
        }
    }

Answer 1

尝试这样改变

 $select_amount_paid = 'SELECT SUM(total_amount) total_amount FROM graphics_booking AS bk
        WHERE date = '.$date;//i assume that date is an colum from graphics_booking

你的“bk.date”是错误的，如果它在你的表中，并且带有where条件，你可以直接给出，并且尽量避免模型中的函数和分配的变量使用相同的名称。尝试更改为不同的。否则你的代码看起来不错

Answer 2

不，当你返回时你不能返回整个，你需要返回一行

所以你需要在模型中执行以下操作：

 function total_cost_for_A($branch, $department, $date)
    {
        if($branch == 'Head Office' && $department == 'Summary')
        {
            $select_amount_paid = 'SELECT SUM(total_amount) total_amount FROM graphics_booking AS bk
            WHERE bk.date = "'.$date.'"';
        }

        $result = $this->db->query($select_amount_paid);

        if($result->num_rows() > 0)
        {
            return $result->row();     // you missed out here
        }
        else
        {
            return FALSE;
        }
    }

total_cost_for_B() 也一样