来自SQL查询的php中的Group By标题

Question

下面是我从一个查询中得到的表：

----------+----+-----------+----------------------
45678-sm-w| 18 |T-Shirts   | Mens clothing
----------+----+-----------+----------------------
45678-sm-b|  5 |T-Shirts   | Mens clothing
----------+----+-----------+----------------------
2189-L-Wh |  4 | Socks     | Juniors Clothing
----------+----+-----------+----------------------
2189-L-Bl |  3 | Socks     | Juniors Clothing
----------+----+-----+-----+----------------------

我想把下面的内容放到报告中：

T-Shirts
----------+----+-----------+----------------------
45678-sm-w| 18 |T-Shirts   | Mens clothing
----------+----+-----------+----------------------
45678-sm-b|  5 |T-Shirts   | Mens clothing
----------+----+-----------+----------------------

Socks
 ----------+----+-----------+----------------------
2189-L-Wh |  4 | Socks     | Juniors Clothing
----------+----+-----------+----------------------
2189-L-Bl |  3 | Socks     | Juniors Clothing
----------+----+-----+-----+----------------------

我知道它是通过一个循环来完成的，但我无法弄清楚它。谢谢!

Answer 1

尝试按项目类型对查询进行排序，并在当前标题更改时强制显示标题。

$res = mysql_query("select * from clothing order by item_type, item_size");

$item_type=null;
while ($row = mysql_fetch_assoc($res)) {
    if ($item_type != $row['item_type']) {
        $item_type = $row['item_type'];
        echo $item_type . "\r\n";
    }
    echo $row["item_name"];
    echo $row["item_size"];
    echo $row["item_desc"];
}