MySQL - PHP：计算一天中多个事件之间的总小时数

Question

我有一张名为time_track 的表：

+----+--------+---------------------+---------+
| id | emplid | ctimestamp          | eventid |
+----+--------+---------------------+---------+
| 1  | 13     | 2016-06-02 03:41:41 | 1       |
+----+--------+---------------------+---------+
| 2  | 13     | 2016-06-02 09:04:49 | 2       |
+----+--------+---------------------+---------+
| 3  | 13     | 2016-06-02 10:03:13 | 1       |
+----+--------+---------------------+---------+
| 4  | 13     | 2016-06-02 13:21:23 | 2       |
+----+--------+---------------------+---------+

其中eventid 1 = Start work而eventid 2 = Stop work 。

考虑到工作时间是所有 eventid 的 1 和 2 之间的总小时数，我如何计算任何给定日期的小时数 - WHERE emplid = 13 AND Year(ctimestamp) = 2016 and Month(ctimestamp) = 06 and Day(ctimestamp) = 02

Answer 1

您也可以使用 PHP（而不是 SQL）来实现：

<?php
$data = array( array( "1","2016-06-02 03:41:41" ),
               array( "2","2016-06-02 09:04:49" ),
               array( "1","2016-06-02 10:03:13" ),
               array( "2","2016-06-02 13:21:23" )
             );
$hours = 0;
foreach ( $data as $row ) // PROCESS ALL ROWS FROM QUERY.
{ if ( $row[ 0 ] == "1" ) // IF CURRENT ROW IS START TIME
       $start = strtotime( $row[ 1 ] );
  else { $stop = strtotime( $row[ 1 ] ); // STOP TIME. CALCULATE.
         $hours += ( $stop - $start ) / 3600;
       }
}
echo $hours; // 8.6883333333333.
?>

您可以将结果四舍五入。

将以前的代码复制粘贴到文件中，将其另存为 .PHP 并在浏览器中打开它。 随意更改示例数据。

编辑：调用函数来计算所有小时数更容易：

<?php

function total_hours ( $data )
{ $hours = 0;
  foreach ( $data as $row )
    if ( $row[ "eventid" ] == "1" )
         $start = strtotime( $row[ "ctimestamp" ] );
    else { $stop = strtotime( $row[ "ctimestamp" ] );
           $hours += ( $stop - $start ) / 3600;
         }
  return $hours;
}

$sample_data = array( array( "id"         => 1,
                             "emplid"     => 13,
                             "ctimestamp" => "2016-06-02 03:41:41",
                             "eventid"    => 1 ),
                      array( "id"         => 2,
                             "emplid"     => 13,
                             "ctimestamp" => "2016-06-02 09:04:49",
                             "eventid"    => 2 ),
                      array( "id"         => 3,
                             "emplid"     => 13,
                             "ctimestamp" => "2016-06-02 10:03:13",
                             "eventid"    => 1 ),
                      array( "id"         => 4,
                             "emplid"     => 13,
                             "ctimestamp" => "2016-06-02 13:21:23",
                             "eventid"    => 2 )
                    );
echo total_hours( $sample_data ); // 8.6883333333333.
?>

使用从查询中获得的 sql-result 作为参数调用此函数（并将foreach替换为while ( $row = mysqli_fetch_array )。

Answer 2

与下面仅使用 SQL 的答案不同，将 SQL 和 PHP 结合起来以提高可读性和性能似乎很有效。 此外，PHP 将允许您编写代码来处理诸如丢失或重复数据之类的异常。

<?php
// Generate test data like it would be returned by a PDO::fetchAll(PDO:::FETCH_ASSOC) with
// SELECT * FROM time_track 
//    WHERE emplid = 13 AND Year(ctimestamp) = 2016 and Month(ctimestamp) = 06 and Day(ctimestamp) = 02 
//    ORDER BY ctimestamp
$logs[] = ['ctimestamp'=>'2016-06-02 03:41:41', 'eventid'=>1];
$logs[] = ['ctimestamp'=>'2016-06-02 09:04:49', 'eventid'=>2];
$logs[] = ['ctimestamp'=>'2016-06-02 10:03:13', 'eventid'=>1];
$logs[] = ['ctimestamp'=>'2016-06-02 13:21:23', 'eventid'=>2];

// Compute working time
$worktime = 0; // in seconds
foreach ($logs as $log) {
    if ($log['eventid'] == 1) {  // start work
        $startWork = $log['ctimestamp'];
    } else { // end work
        $endWork = $log['ctimestamp'];
        $worktime += strtotime($endWork) - strtotime($startWork);
    }
}
echo gmdate('H:i', $worktime); // seconds to hours:minutes
?>

运行代码： http : //phpfiddle.org/main/code/jx8h-ztuy

下面是上述代码的经过测试的改进，包括数据库访问和循环。
由于您指出性能至关重要，因此您可能需要使用PDO::prepare()

<pre>
<?php
class TimeLog {
    private $pdo;
    private $pdoStatement;

    // constructor: connect to database and prepare statement
    function __construct(){
        // adapt following constructor to your database configuartion
        $this->pdo = new PDO('mysql:host=localhost;dbname=testdb;charset=utf8mb4', 'username', 'password'); 
        $this->pdoStatement = $this->pdo->prepare(
            'SELECT * FROM time_track 
                WHERE emplid = :emplid 
                AND DATE(ctimestamp) = :cdatestamp
                ORDER BY ctimestamp
        ');
    }

    // compute workTime for given employee and date
    function workTime($emplid, $cdatestamp) {
        // fetch from database, executing prepared statement
        $this->pdoStatement->execute([':emplid'=>$emplid, ':cdatestamp'=>$cdatestamp]);
        $logs = $this->pdoStatement->fetchAll(PDO::FETCH_ASSOC);

        // compute working time
        $worktime = 0; // in seconds
        foreach ($logs as $log) {
            if ($log['eventid'] == 1) {  // start work
            $startWork = $log['ctimestamp'];
            } else { // end work
                $endWork = $log['ctimestamp'];
                $worktime += strtotime($endWork) - strtotime($startWork);
            }
        }
        return gmdate('H:i', $worktime); // convert seconds to hours:minutes
    }
}

$timeLog = new Timelog(); // invoke constructor once

$emplid = 13; // example

// echo registration of last seven days
for ($date = strtotime('-7 days'); $date <= time(); $date += 24 * 3600) {
    // convert $date to YYYY-MM-DD format
    $cdatestamp = date('Y-m-d', $date); 
    // execute one SQL statement and return computed worktime
    $workTime = $timeLog->workTime($emplid, $cdatestamp); 
    // show result
    echo $cdatestamp, "\t", $workTime, "\n";
}
?>

Answer 3

您必须在子目录中自行加入您的表，并获得大于 eventid=1 的 eventid=2 的最小值，并计算这 2 条记录之间的差异。 在外部查询中，您总结了 eventid=1 时间戳的天数差异：

select date(t3.ctimestamp), t3.emplid, sum(diff) / 60 as hours_worked
from
    (select t1.id, t1.ctimestamp, t1.emplid, min(t2.ctimestamp) as mintime, timestampdiff(minute,min(t2.ctimestamp), t1.ctimestamp) as diff 
     from yourtable t1
     inner join yourtable t2 on t1.ctimestamp<t2.ctimestamp
     where t1.eventid=1
           and t2.eventid=2
           and t1.emplid=13
           and t2.emplid=13
           and date(t1.ctimestamp)='2016-06-02' --may have checked out the next day, I do not know how you want to handle that
     group by t1.id, t1.ctimestamp, t1.emplid) t3
group by date(t3.ctimestamp)

在实时环境中，我不会将解决方案基于没有间隙的 id 列，即使它是自动增量列。 通常有间隙。 您还需要决定如果您有孤立签入或签出事件会发生什么。 我的代码假设每次签入都有相应的签出。

Answer 4

你可以试试这样的

如果您需要进一步分离您的数据，您也可以按年和月分组。

select day(ctimestamp) as Day, hour(ctimestamp) as Hour, count(*) as Count
from MyTable
where ctimestamp between :date1 and :date2
group by day(ctimestamp), hour(ctimestamp)

Answer 5

您需要计算事件 1 和事件 2 的时间戳之间的差异。这确实假设对于任何给定的一天，每个 empl_id 只有 2 个事件并且结帐时间在同一天（例如，隔夜时间将未显示在此查询中）。 这不是一个非常强大的解决方案，但我不确定您的数据的完整性以及您需要处理的边缘情况。

SELECT TIMEDIFF(t1.c_timestamp, t2.c_timestamp) / 3600 AS hourDiff
FROM time_track t1
INNER JOIN time_track t2 
ON (t2.id > t1.id AND t2.event_id = 2 AND t1.empl_id = t2.empl_id AND DAY(t2.c_timestamp) = DAY(t1.c_timestamp) AND MONTH(t2.c_timestamp) = MONTH(t1.c_timestamp) AND YEAR(t2.c_timestamp) = YEAR(t1.c_timestamp))
WHERE t1.event_id = 1 AND t1.empl_id = 13 AND Year(t1.c_timestamp) = 2016 and Month(t1.c_timestamp) = 6 and Day(t1.c_timestamp) = 2

Answer 6

SELECT UNIX_TIMESTAMP('2010-11-29 13:16:55') - UNIX_TIMESTAMP('2010-11-29 13:13:55') 作为输出

$entry_time = [... 使用查询在此处获取...]

$exit_time = [...使用查询在此处获取...]

$query = " SELECT UNIX_TIMESTAMP(' ".$entry_time." ') - UNIX_TIMESTAMP(' ". $exit_time ." ') as days; ";

Answer 7

查询： SELECT DATEDIFF('2010-10-08 18:23:13', '2010-09-21 21:40:36') AS days;

$time_entry = [...] // 查找查询并将输出保存到此变量

$time exit = [...] // 查找查询并保存输出到这个变量

$query = " SELECT DATEDIFF(' ". time_entry ." ', ' ".time_exit." ') AS days; "