Question

<?php
require 'connect.php';
$search = $_POST["search"];

这两个查询工作正常。所以我使用了下面的格式。

$result = mysql_query("SELECT * FROM `subjects` WHERE $search = `student_id`");
$result2 = mysql_query("SELECT * FROM `grades` WHERE $search = `student_id`");

while($row = mysql_fetch_array($result)) {
$row2 = mysql_fetch_array($result2);
echo"<table border='1'>";
echo "<tr>";
echo    "<th>Subjects:</th>";
echo    "<th>Current Mark:</th>";
echo    "<th>Edit Mark:</th>";
echo"</tr>";
echo"<tr>";
echo "<td>". $row['c1'] ."</td>";
echo "<td>". $row2['m1'] ."</td>";
echo "<td><input type='text' name='m1'></td>";
echo  "</tr>";
echo  "<tr>";
echo    "<td>". $row['c2'] ."</td>";
echo "<td>". $row2['m2'] ."</td>";
echo "<td><input type='text' name='m2'></td>";
echo  "</tr>";
echo  "<tr>";
echo    "<td>". $row['c3'] ."</td>";
echo "<td>". $row2['m3'] ."</td>";
echo "<td><input type='text' name='m3'></td>";
echo  "</tr>";
echo  "<tr>";
echo    "<td>". $row['c4'] ."</td>";
echo "<td>". $row2['m4'] ."</td>";
echo "<td><input type='text' name='m4'></td>";
echo  "</tr>";
echo  "<tr>";
echo    "<td>". $row['c5'] ."</td>";
echo "<td>". $row2['m5'] ."</td>";
echo "<td><input type='text' name='m5'></td>";
echo  "</tr>";
echo  "<tr>";
echo    "<td>". $row['c6'] ."</td>";
echo "<td>". $row2['m6'] ."</td>";
echo "<td><input type='text' name='m6'></td>";
echo  "</tr>";
echo  "<tr>";
echo    "<td>". $row['c7'] ."</td>";
echo "<td>". $row2['m7'] ."</td>";
echo "<td><input type='text' name='m7'></td>";
echo  "</tr>";
echo "</table>";
echo "<input type='submit' name='submit' value='Submit'>";
echo "</form>";
}

 $M1 = $_POST["m1"];
 $M2 = $_POST["m2"];
 $M3 = $_POST["m3"];
 $M4 = $_POST["m4"];
 $M5 = $_POST["m5"];
 $M6 = $_POST["m6"];
 $M7 = $_POST["m7"];

如果我输入数字e.x，它会起作用。 11111

否则只会在表格中输入空格。

我试过'“。$ search。”'

我试过“。$ search。”

mysql_query("UPDATE grades SET m1 = '$M1', m2 = '$M2',m3 = '$M3',m4 = '$M4',m5 =    '$M5',m6 = '$M6',m7 = '$M7' WHERE $search = `student_id`");
?>

表

+ ------------ + --- + + --- --- --- + + --- + + --- --- +

| student_id数据| M1 | M2 |立方米| M4 | M5 | M6 | M7 |

+ ------------ + --- + + --- --- --- + + --- + + --- --- +

===数据库d1

==表格等级的表格结构

| ------ |栏|类型|空|缺省 | ------ | // student_id数据 // | INT（5）|没有| | M1 |文|没有| | 2 |文|没有| | M3 |文|没有| | M4 |文|没有| | M5 |文|没有| | M6 |文|没有| | M7 |文|没有| ==转储表等级的数据

| 11111 | | | | | | | | 11112 | FG | FD | F | F | FD | F | F

===数据库d1

==表格主题的表格结构

| ------ |栏|类型|空|缺省 | ------ | // student_id数据 // | INT（11）|没有| | C1 |文|没有| | C2 |文|没有| | C3 |文|没有| | 4 |文|没有| | C5 |文|没有| | 6 |文|没有| | 7 |文|没有| ==转储表主题的数据

| 11111 |英语|数学|科技|体育| IT |艺术|历史 | 11112 | grdgg | vsbvbbb | bdbbrfd | bdbrb | dbrbfbf | fbdfbdbf | dbfbdfb

Answer 1

编辑：值不会反映到输入中，而是反映在 td 中。将行值插入input元素，以便$ _POST值。

$value = $row['m1'];

echo "<td><input type='text' name='m1' value='$value'></td>";

Answer 2

你应该修复

$result = mysql_query("SELECT * FROM `subjects` WHERE student_id='$search'");
$result2 = mysql_query("SELECT * FROM `grades` WHERE student_id='$search'");

PHP / MYSQL：当我在最后一个mysql_query的WHERE条件中使用变量时，数据库会清空

2 个答案: