updating multiple rows with one form

Hello all,

I am trying to show multiple items from a database, with the option to change the prices.  However, I'm unsure how to update.  Can you please help?  Here is a snippet of my code:

<?php
include ("databaseinfo.php")
//count number of records
$result = mysql_query("SELECT * FROM tableitems WHERE Item='$item' AND Date >= '$from_date' AND Date <= '$to_date'") or die(mysql_error());
$num_rows = mysql_num_rows($result);

if(mysql_num_rows($result) == 0) {
  echo "<center>No results were found.</center>";
}

//number you want to display per page
$page_rows=50;

//This tells us the page number of last page
$last=ceil($num_rows/$page_rows);


//determine results
//This checks to see if there's a page number.  If not, it will set it to page 1.
if(isset($_GET['pagenum'])) {
  $pagenum=$_GET['pagenum'];
}
else{
  $pagenum=1;
}

$pagenum=(int)$pagenum;
if ($pagenum>$last)
{
$pagenum=$last;
}

if ($pagenum<1)
{
$pagenum=1;
}

$offset=($pagenum - 1) * $page_rows;


echo "<center>";
echo "<b>";
echo "Prices from: ";
echo $from_date;
echo " to ";
echo $to_date;
echo "</b>";
echo "</center>";
echo "<br>";
echo "<table align=center cellpadding=\"10\" width=\"400\" border=\"1\">";
echo "<tbody>";
echo "<form action=\"update.php\" method=\"post\" name=\"form\">";

$i=1;
$result = mysql_query("SELECT * FROM tableitems WHERE
Item='$item' AND Date >= '$from_date' AND Date <= '$to_date' ORDER BY
ItemNum LIMIT $offset, $page_rows") or die(mysql_error());
while($row = mysql_fetch_array($result))
  {
$date=$row['Date'];
$date=htmlspecialchars($date);
$date_sq=mysql_real_escape_string($date);
$date8_sq=substr($date_sq, 0, -9);
$date_sq=date('m-d-Y', strtotime($date8_sq));

$date9_sq=date('Y-m-d', strtotime($date8_sq));

$price=$row['Price'];
$price=htmlspecialchars($price);
$price_sq=mysql_real_escape_string($price);

$num=$row['ItemNum'];
$num=htmlspecialchars($num);
$num_sq=mysql_real_escape_string($num);

echo "<tr><td>";
echo "<center>";
echo $item;
echo "</center>";
echo "</td><td>";
echo "<center>";
echo $date_sq;
echo "</a>";
echo "</center>";
echo "</td><td>";
echo "<center>";
echo "<input type=\"text\" name=\"price[]\" value='$price_sq'>";
echo "</center>";
echo "</td></tr>";
$i++;
  }

echo "</tbody></table>";

if ($none!=1)
{
echo " Page ";
}

for ($i=1; $i<=$last; $i++)
{
if (($i=="1") && ($i==$pagenum))
{
echo " <a href='{$_SERVER['PHP_SELF']}?pagenum=1&amp;f=$from_date&amp;t=
$to_date&amp;i=$item'>";
echo $i;
echo "</a>";
}
elseif (($i=="1") && ($i!=$pagenum))
{
echo " <a href='{$_SERVER['PHP_SELF']}?pagenum=1&amp;f=$from_date&amp;t=
$to_date&amp;i=$item'>";
echo $i;
echo "</a>";
}
elseif (($i>1) && ($i!=$last) && ($i==$pagenum))
{
echo " <a href='{$_SERVER['PHP_SELF']}?pagenum=$pagenum&amp;f=$from_date&amp;t=
$to_date&amp;i=$item'>";
echo $i;
echo "</a>";
}
elseif (($i>1) && ($i!=$last) && ($i!=$pagenum))
{
$next = $pagenum+1;
echo " <a href='{$_SERVER['PHP_SELF']}?pagenum=$i&amp;f=$from_date&amp;t=
$to_date&amp;i=$item'>";
echo $i;
echo "</a>";
}
elseif (($i==$last) && ($i==$pagenum))
{
echo " <a href='{$_SERVER['PHP_SELF']}?pagenum=$last&amp;f=$from_date&amp;t=
$to_date&amp;i=$item'>";
echo $i;
echo "</a>";
}
elseif (($i==$last) && ($i!=$pagenum))
{
echo " <a href='{$_SERVER['PHP_SELF']}?pagenum=$last&amp;f=$from_date&amp;t=
$to_date&amp;i=$item'>";
echo $i;
echo "</a>";
}
echo "<table align=center>";
echo "<tbody>";
echo "<tr>";
echo "<td>";
echo "<center>";
echo "<input type=\"submit\" name=\"submit\" value=\"Submit\"></center>";
echo "</td>";
echo "</tr>";
echo "</form>";
echo "</tbody>";
echo "</table>";
echo "</center>";
?>

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<?php
//update.php
include ("databaseinfo.php");

if(isset($_POST['submit']))
{

for($i=0;$i<$num_rows;$i++){

$result = mysql_query("UPDATE tableitems SET Price='$price[$i]' WHERE ItemNum='$num_sq'") or die(mysql_error());  
}
}
?>

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Thank you in advance.
LVL 4
happysunnyAsked:
Who is Participating?
 
maricksvilleConnect With a Mentor Commented:
Hey Happy,

Having a look at your code, I'm a little confused but this might help. When you submit your form you are sending the POST variable price which is an array.

The first thing I would change is line 87 to:

echo "<input type=\"text\" name=\"id[$num]\" value='$price_sq'>";

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You want to specify the name as the ID number of the line in the MYSQL database that you want to update. So the line above is saying 'The value of ID number ... is ...

To get the values of the key-value pairs out of the POST array we can then iterate through the ID array and update the prices based on the ID submitted.

foreach($_POST['id'] as $id => $value) {
$result = mysql_query("UPDATE tableitems SET Price='$value' WHERE ItemNum='$id' limit 1") or die(mysql_error());  
}

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Note the added 'limit 1' to the $result line. Without the limit defined as 1 you can inadvertently update every single line of your table.

Try this and see how you go.
0
 
Hugh McCurdyCommented:
For starters, I think you need to do some homework.  I suggest you look at  http://www.w3schools.com/php/php_forms.asp

The update.php code doesn't know about the settings of variables from the first section.  Pass the information using $_POST variables.

You need to pass the number of items and we will need to do something about the variable names.  But first, see if you can get it to pass the number of variables.

0
 
happysunnyAuthor Commented:
Yes, thank you.  I forgot that.  When I add: $price=$_POST['price']; echo $price; on the next page, I get the correct amount.  But wouldn't I need that to be an array?  And how would I get this to work?
0
 
happysunnyAuthor Commented:
A ha!  That makes sense :)  Thank you!
0
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