Submitting multiple form row into table using sql loop - php

Question

i have collected multiple rows from a student table. and its listing them just fine.
<?php
$sql = "SELECT * FROM `students` WHERE `class`='$class' && `academicyear`='$academicyear'";
$result = mysqli_query($conn, $sql);
if (mysqli_num_rows($result) > 0) {
// output data of each row
while($row = mysqli_fetch_assoc($result)) {
?>
<tr>
<td><?php echo #++$n ; ?> </td>
<td><?php echo $row["studentid"]?> <input type="text" name="studentid" value="<?php echo $row["studentid"]?>" style="visibility: hidden; width: 10px;"></td>
<td><?php echo $row["fname"]?> &nbsp <?php echo $row["sname"]?> <input type="text" name="name" value="<?php echo $row["fname"]?> <?php echo $row["sname"]?>" style="visibility: hidden; width: 10px;"></td>
<td style="display: none; width: 10px;"><input type="text" name="class" value=" <?php echo $class; ?>"> </td>
<td style="display: none; width: 10px;"><input type="text" name="academicyear" value=" <?php echo $academicyear; ?>"></td>
<td style="display: none; width: 10px;"><input type="text" name="rowcount" value=" <?php echo $rowcount; ?>"> </td>
</tr>
<?php
}
} else {
echo "";
}
mysqli_close($conn);
?>
my difficulty is how to submit this multiple rows into another table called classlist
<?php
// Receiving variables
#$pfw_ip= $_SERVER['REMOTE_ADDR'];
#$example1_length = addslashes($_POST['example1_length']);
#$studentid = addslashes($_POST['studentid']);
#$name = addslashes($_POST['name']);
#$class = addslashes($_POST['class']);
#$academicyear = addslashes($_POST['academicyear']);
#$rowcount = addslashes($_POST['rowcount']);
// Validation
//saving record to MySQL database
#$pfw_host = "localhost";
#$pfw_user = "root";
#$pfw_pw = "";
#$pfw_db = "myschool";
$pfw_link = mysql_connect($pfw_host, $pfw_user, $pfw_pw);
if (!$pfw_link) {
die('Could not connect: ' . mysql_error());
}
$pfw_db_selected = mysql_select_db($pfw_db, $pfw_link);
if (!$pfw_db_selected) {
die ('Can not use $pfw_db : ' . mysql_error());
}
$i=0;
while ($i<= $rowcount) {
#$pfw_strQuery = "INSERT INTO `classlist`(`studentid`,`name`,`class`,`academicyear`) VALUES (\"$studentid\",\"$name\",\"$class\",\"$academicyear\")" ;
$rowcount = $rowcount - 1;
}
//insert new record
$pfw_result = mysql_query($pfw_strQuery);
if (!$pfw_result) {
die('Invalid query: ' . mysql_error());
}
mysql_close($pfw_link);
header('location:classlist.php');
?>
i only get the last row data submitted into the classlist table then an error appear -- invalid query, duplicate query.
please help.

Answer 1

You must use single quotes to wrap strings in SQL
#$pfw_strQuery = "INSERT INTO `classlist`(`studentid`,`name`,`class`,`academicyear`) VALUES ('$studentid','$name','$class','$academicyear')" ;