Question

我需要调查已经运行和待机的机器长度。我在数据库中有条目如下：

move $t4, $t2

时间现在是| machine | running | start | |---------|---------|---------------------| | 1 | 0 | 2018-03-13 00:00:00 | | 1 | 1 | 2018-03-13 00:30:00 | | 1 | 0 | 2018-03-13 02:00:00 |。使用上面的示例时，结果应为2018-03-13 04:00:00（正在运行）和01:30:00（待机）。

进行此类计算的最佳方法是什么？我的数据库条目是否足够好？

我在后端使用像Laravel这样的工具，并且f.ex. Vue和Moment.js在前端。提前谢谢。

Answer 1

希望这可以解决问题：

<?php

$rs = [
    [
        'machine' => 1,
        'running' => 0,
        'start' => '2018-03-13 00:00:00'
    ],
    [
        'machine' => 1,
        'running' => 1,
        'start' => '2018-03-13 00:30:00'
    ],
    [
        'machine' => 1,
        'running' => 0,
        'start' => '2018-03-13 02:00:00'
    ],
    [
        'machine' => 1,
        'running' => 1,
        'start' => '2018-03-13 03:00:00'
    ],
];

$lastState = -1;
$startDateTime = $endDateTime = null;
$totalStates = count($rs);

foreach ($rs as $r)
{
    $machine = $r['machine'];
    $running = $r['running'];
    $start = $r['start'];

    if (-1 === $lastState) {
        $startDateTime = new \DateTime($start);
        $lastState = $running;
    }
    else {
        $endDateTime = new \DateTime($start);
        $dateTimeInterval = $endDateTime->diff($startDateTime);

        echo "State: ". $lastState ." / Total time: " . $dateTimeInterval->format("%H:%I:%S") . "\n";

        $startDateTime = new \DateTime($start);
        $lastState = $running;
    }
}

输出：

State: 0 / Total time: 00:30:00
State: 1 / Total time: 01:30:00
State: 0 / Total time: 01:00:00

计算多行的持续时间

1 个答案: