Question

当我打印出一张表时，我有一个查询给出了类似下面的结果：

+---------------------------------------------------------------------+
|    ID      |    Name     |    Color      |     Size     |    Qty    |
+---------------------------------------------------------------------+
|    1       |    First    |    Green      |      S       |     1     |
|    2       |    First    |    Green      |      L       |     2     |
|    3       |    First    |    Green      |      XL      |     1     |
|    4       |    First    |    Red        |      M       |     2     |
|    5       |    First    |    Red        |      L       |     3     |
|    6       |    Second   |    Blue       |      S       |     1     |
|    7       |    Second   |    Blue       |      M       |     4     |
+---------------------------------------------------------------------+

现在我想概述（在现实生活中这些是产品），有人可以点击按钮进行编辑或删除。我想用foreach循环或其他东西循环它并打印出类似这样的东西：

+========================================================================+
|    Name     |    Color      |     Size     |    Qty    |    Action     |
+========================================================================+
|    First    |    Green      |      S       |     1     |  Edit|Delete  |
|             |               |      L       |     2     |  Edit|Delete  |
|             |               |      XL      |     1     |  Edit|Delete  |
+------------------------------------------------------------------------+
|    First    |    Red        |      M       |     2     |  Edit|Delete  |
|             |               |      L       |     3     |  Edit|Delete  |
+------------------------------------------------------------------------+
|    Second   |    Blue       |      S       |     1     |  Edit|Delete  |
|             |               |      M       |     4     |  Edit|Delete  |
+------------------------------------------------------------------------+

但不知何故，我无法理解如何编程这个循环。或者我应该更改查询？我希望有人能帮帮忙。如果您需要更多信息，请告诉我。

Answer 1

您可以在数据库中执行此操作，这样可以更轻松地在代码中显示数据：

select 
    group_concat(ID) as id, 
    name, 
    color, 
    group_concat(size) as size, 
    group_concat(qty) as qty 
from 
    myTable
group by
    name,
    color

结果如下：

ID     | name  | color | size   | qty
1,2,3  | First | Green | S,L,XL | 1,2,1
etc...

现在，在您的代码中，这样可以更轻松地按照您希望的方式输出。

echo "<table>";
while($row=someFetchFromDatabase($results))
{
    echo "<tr><td>".$row['name']."</td><td>".$row['color']."</td>";
    $temp=explode($row['size']);
    echo "<td>";
    foreach($temp as $val)
    {
        echo $val."<br>";
    }
    echo "</td>";
    $temp=explode($row['qty']);
    echo "<td>";
    foreach($temp as $val)
    {
        echo $val."<br>";
    }
    echo "</td>";
    $temp=explode($row['IDs']);
    echo "<td>";
    foreach($temp as $val)
    {
        echo "<a href='someLink.php?action=edit&ID=".$val."'>Edit</a> | <a href='someLink.php?action=delete&ID=".$val."'>Delete</a>";
    }
    echo "</td></tr>";
}
echo "</table>'

Answer 2

我不会对查询做任何事情。

在伪代码中（我不会说PHP）...

variables $name = "", $colour = "";
for (every row)    
    if (row.name = $name) and (row.colour = $colour)
        display nothing for name and colour
    else
        display row.name
        display row.colour
        $name = row.name
        $colour = row.colour

如何为此查询结果创建一个良好的循环

2 个答案: