Question

我有一个日志记录，用于保存员工的日志记录（赚取的金额等）以及将数据分成每个员工ID下分组的表格的代码：

Empid: 0001
---------------------------
| Logid   | Hours   | Pay |
---------------------------
|  1001   | 10      | 50  |
---------------------------
|  1002   | 2       | 10  |
---------------------------

Empid: 0003
---------------------------
| Logid   | Hours   | Pay |
---------------------------
|  1003   | 3       | 9   |
---------------------------
|  1004   | 6       | 18  |
---------------------------

我使用以下半伪代码管理它：

$query = mysql_query("SELECT * FROM `log` ORDER BY empid");
$id = 0;

while ($list = mysql_fetch_assoc($query)) {
    if ($id != $list['logid']) {
          create header (Logid, Hours, Pay)
          $id = $list['logid'];
          }
    add each data row for the empid
}

但是现在我想添加Pay列的总数，并将它放在每个表的底部，用于每个empid。

通过在while循环中输入代码$ total_pay = $ total_pay + $ list ['pay']，我可以得到总薪水，但我无法弄清楚如何能够在底部显示总数。

非常感谢任何关于此的建议！

Answer 1

这应该这样做。你基本上总结，直到id改变。

$sum = 0;
while ($list = mysql_fetch_assoc($query)) {    
    if ($id != $list['logid']) {
          //create the totals using $sum !!!
          // after that re-set sum to 0
          $sum = 0;
          //create header (Logid, Hours, Pay)
          $id = $list['logid'];
    }
    $sum += $list['Pay'];
    //add each data row for the empid
}

也...

Please, don't use mysql_* functions in new code。它们不再被维护and are officially deprecated。请参阅red box？转而了解prepared statements，并使用PDO或MySQLi - this article将帮助您确定哪个。如果您选择PDO here is a good tutorial。

Answer 2

有两种方法可以做到这一点。

PHP

保持所有“付费”值的总计，并将其添加到底部的表格中。例如：

$i=0;
while ($list = mysql_fetch_assoc($query)) {   // for each row in your results
    if ($id != $list['EmployeeId']) {  // We only enter this loop if the EmployeeId doesn't equal $id. This can happen because either $id doesn't exist yet, or it doesn't match the previous EmployeeId
          $i++;  // increase $i by 1
          if($i>1) {  // Enter this loop only if $i is greater than or equal to 2 (if it is less than two, then this is our first time running this script, and adding a footer row wouldn't make any sense).
              create footer (EmployeeId, Hours, Pay);  // Log Id is irrelevant here
          }
          //  reset your variables here
          $id = $list['EmployeeId'];  // set $id = the first or the new Employee ID
          $total_pay = $list['pay'];  // This is our first time for this Employee, so don't just add it to the running total
          create header (EmployeeId, Hours, Pay) // Create the top half of your table
    } else {  // The EmployeeId has been established: we only need to change the running total
          $total_pay = $total_pay + $list['pay'];
    }
    //  add a data row for each LogId. This executes every time we go through the loop
    create_normal_row(LogId, EmployeeId, Hours, Pay)
}

// At this point, both Employees have a header, and all data rows. However, we left the loop before we could add the last Employee's footer row
// Let's add one more footer row for the last user
create_footer (Logid, Hours, Pay);

SQL

MySQL有一个函数可以执行与您尝试执行的调用ROLLUP非常类似的操作。你可以在这里阅读更多相关信息：

http://dev.mysql.com/doc/refman/5.0/en/group-by-modifiers.html

基本上，您可以将查询更改为：

SELECT LogId, EmployeeId, SUM(Hours), SUM(Pay) FROM `log` 
GROUP BY empid, logid WITH ROLLUP

此查询将返回如下所示的数据集：

---------------------------------------
| Logid   | EmployeeId| Hours   | Pay |
---------------------------------------
|  1001   | 1         | 10      | 50  |
---------------------------------------
|  1002   | 1         | 2       | 10  |
---------------------------------------
|  NULL   | 1         | 12      | 60  |
---------------------------------------
|  1003   | 2         | 3       | 9   |
---------------------------------------
|  1004   | 2         | 6       | 18  |
---------------------------------------
|  NULL   | 2         | 9       | 27  |
---------------------------------------
|  NULL   | NULL      | 21      | 87  |
---------------------------------------

每当$list['Logid']为空时，您就知道您有一个“总”行。但要小心，这将在数据集的底部添加“所有员工的总和”行。如果$list['EmployeeId']为空，那么您就知道自己在这个“总”行中。

在相关说明中（我不确定这是否是您所要求的），您可以使用HTML <table>元素在表格中显示这些内容。

每一行都如下所示：

<table> <!-- shown at the beginning of each table -->
<tr> <!-- shown at the beginning of each row -->
<td> <!-- shown at the beginning of each table cell -->
Your text goes here
</td> <!-- shown at the end of each table cell -->
<td>
More text can go here
</td>
</tr> <!-- shown at the end  of each row -->
</table> <!-- shown at the end of each table -->

<tr>可以在每个<table>内无限期重复，<td>可以在<tr> s内重复。

php - 在列中查找总计

2 个答案:

PHP

SQL