php - 如何在动态查询中生成静态值

Question

你好，这是我的代码，我想让它动态化，请给我一个解决方案。

$start = strtotime($this->input->post('leave_from'));
$end = strtotime($this->input->post('leave_to'));
$days_between = ceil(abs($end - $start) / 86400 + 1);

if($this->input->post('leave_type') == 3){
    $days_between = 0.5;
}

我想让这个动态化，如何使用查询来实现。

$q = "set leave_applications.days = '0.5' on leave_applications where leave_type = 3 "; 
$days_between = $this->leave_application_model->q_single($q);

不知道这样对不对，但是报错

Unknown system variable 'days' set leave_applications.days = '0.5' on leave_applications where leave_type = 3

帮我看看怎么做。 谢谢。

Answer 1

UPDATE `leave_applications` SET `days` = '0.5' WHERE `leave_type` = 3