在 php、mysql 中要 master2。我是 php 新手大约 2 个月
我需要帮助。关于更新表。
我有显示当前表格的页面。当我单击更新按钮更新时,我想要第 1 行,当前表中的数量将减少结果表中的 IdItem。因此,当前表中的等式将像这样数量=数量-数量通行证。所以只有字段项目更改数量结果。现在,当我单击更新时,它会影响表中的所有当前结果。任何解决方案?
“结果”表
+--------+-------------+--------------+-----------+--------+--------------+
| IdItem | username | rentItem | quantity | result | quantityPass |
+--------+-------------+--------------+-----------+--------+--------------+
| 84 | FahmiNazirul| Speaker | 1 | PASS | 1 |
+--------+-------------+--------------+-----------+--------+--------------+
| 86 | Andy | Keyboard | 3 | PASS | 2 |
+--------+-------------+--------------+-----------+--------+--------------+
| 89 | FahmiNazirul| Speaker | 5 | PASS | 3 |
+--------+-------------+--------------+-----------+--------+--------------+
当前数量“更新”表
+--------+-------------+--------------+
| Id | Item | quantity |
+--------+-------------+--------------+
| 1 | Speaker | 10 |
+--------+-------------+--------------+
| 2 | Keyboard | 10 |
+--------+-------------+--------------+
表更新.php
$result = mysql_query("SELECT * FROM update where Item = Item");
echo "<table border='1'>
<tr>
<th>Item</th>
<th>Quantiti</th>
<th></th>
</tr>";
while($row = mysql_fetch_array($result))
{
$item= $row['Item'];
echo " <tr> ";
echo " <td> " . $row['Item'] . " </td> ";
echo " <td> " . $row['quantity'] . " </td> ";
echo " </tr> ";
}
echo "</table>";
echo " <a href ='quantityupdate.php?Item=$item' onclick='return Confirm_Box()' >Update</a>";
数量更新.php
$item =$_REQUEST['Item'];
// sending query
mysql_query("UPDATE update ,result SET update.quantity=update.quantity-result.quantityPass where update.Item = result.rentItem")
or die(mysql_error());
header("Location: update.php");