我是编写程序的新手,
我需要获取数据类型为 datetime-local 的 2 列之间的时间戳差异。
下面是一个 sql 查询,它使用合适的语法来获取中断持续时间
SELECT timestampdiff(hour,DateStarted,DateRestored) as Outage from network_outage
但是我不知道如何将这个插入到我的数据库中 我正在使用 codeigniter 框架
见下面的型号代码
function get_networkoutage($OutageDuration)
{
$this->db->select('timestampdiff(DateStarted,DateRestored) as OutageDuration',$OutageDuration);
$query = $this->db->get('network_outage');
return $query;
}
下面是我的控制器代码
$data['NetworkOutage'] = $this->network_model->get_networkoutage($OutageDuration);
在视图页面中回显 NetworkOutage 后,它给了我一个错误
A PHP Error was encountered
Severity: Notice
Message: Undefined variable: OutageDuration
Filename: controllers/Site.php
Line Number: 59
Backtrace:
File: D:\xampp\htdocs\itsystem\application\controllers\Site.php
Line: 59
Function: _error_handler
File: D:\xampp\htdocs\itsystem\index.php
Line: 315
Function: require_once
Error Number: 1064
You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'DateStarted, DateRestored) as OutageDuration FROM `network_outage`' at line 1
SELECT timestampdiff(DateStarted, DateRestored) as OutageDuration FROM `network_outage`
Filename: D:/xampp/htdocs/itsystem/system/database/DB_driver.php
Line Number: 691
胡子哥哥