Question

我在下面有这段代码。

<?php

require_once 'con.php';

$start_time_input = strtotime('08:00:00');
$finish_time_input = strtotime('17:00:00');

$total_time = 0;

$query = mysqli_query($con, "SELECT `start_break`, `finish_break` FROM `break_time` WHERE `start_break` AND `finish_break` BETWEEN '".$start_time_input."' AND '".$finish_time_input."' " );

while($tampil = mysqli_fetch_array($query)){

    $start_time_db = strtotime($tampil['start_break']);
    $finish_time_db = strtotime($tampil['finish_break']);

    if ($start_time_input <= $start_time_db AND $finish_time_input >= $finish_time_db) {

        $total_time = (($finish_time_input - $start_time_input) - ($finish_time_db - $start_time_db)) / 3600;

    } else {
        $total_time = ($finish_time_input - $start_time_input) / 3600;
    }

    echo $total_time;

}

?>

我尝试执行php文件，页面显示没什么，mysql查询似乎不正确。但是当我尝试在phpmyadmin SELECT start_break, finish_break FROM break_time WHERE start_break AND finish_break BETWEEN '08:00:00' AND '17:00:00'中运行此查询时，查询会按预期给出结果。

任何人都可以帮我这个吗？我曾尝试做一些研究，但据我所知，我只需要将 strtotime 添加到我的变量中，我已经这样做了，没有任何反应。

非常感谢任何帮助。

Answer 1

这是您当前的查询：

SELECT start_break,
       finish_break
FROM break_time
WHERE start_break AND finish_break BETWEEN '08:00:00' AND '17:00:00'

WHERE子句表示start_break评估为真，finish_break为上午8点至下午5点。这可能不是您想要的，因为start_break将始终评估为true。来自MySQL documentation：

MySQL将任何非零非NULL值评估为TRUE

除了WHERE子句中的逻辑问题之外，您还尝试直接将开始列和结束列与仅限时间的字符串进行比较。除非这些列也是时间，否则这将无效。我怀疑。

以下是您可能逻辑上想要的查询：

SELECT start_break,
       finish_break
FROM break_time
WHERE DATE_FORMAT(start_break, '%H:%i:%s') BETWEEN '08:00:00' AND '17:00:00' AND   -- both the start break and
      DATE_FORMAT(finish_break, '%H:%i:%s') BETWEEN '08:00:00' AND '17:00:00'      -- finish break are within range

这假定start_break和end_break列为datetime，您只想比较一天中的时间。

在MYSQL和PHP变量中使用BETWEEN进行SELECT

1 个答案: