update multiple rows in one sql query - php

Question

Im new in php. this problem stuck me for two days. ergh. I want to display a table that contain input field so that user can insert the data and update it into database. User can change all the data in the table. I want to update multiple rows at a time, but it ends up updating only 1 row (the last row). Anyone please help me for this. Thnks.
This are the form.
This are the following code.
[<table>
<thead>
<tr>
<td><b>Item Code</b></td>
<td><b>Item Barcode</b></td>
<td><b>Item</b></td>
<td><b>QOH</b></td>
<td><b>Quantity</br>Checked</b></td>
<td><b>Quantity</br>Order</b></td>
</tr>
</thead>
<?php
$Barcode=$_SESSION\["Barcode"\];
$code=$_SESSION\["Code"\];
$itemcode=$_SESSION\["Itemcode"\];
$guid=$_SESSION\["guid"\];
$sql = "SELECT itemmastersupcode.*, itembarcode.*, stock_count_item.*, stock_count.*, po_ex_c.*, d.itemlink_total_qty
FROM itemmastersupcode
WHERE stock_count.SupCode = '$code' and stock_count_item.TRANS_GUID = '$guid'
GROUP BY itemmastersupcode.Itemcode";
$result=mysqli_query($conn2,$sql);
$rowcount = mysqli_num_rows($result);
while($row = mysqli_fetch_assoc($result))
{
?>
<tbody>
<tr>
<td><?php echo $row\["Itemcode"\]; ?></td>
<td><?php echo $row\["Barcode"\]; ?></td>
<td><?php echo $row\["Description"\]; ?></td>
<td><?php echo $row\["itemlink_total_qty"\]; ?></td>
<td><?php echo $row\["qty"\]; ?></td>
<form class="form-inline" role="form" method="POST" id="myForm">
<td><input type="number" name="qty" value=""/></td>
</tr>
</tbody>
<input type="hidden" name="itemcode" value="<?php echo $row\["itemcode"\]; ?>"/>
<input type="hidden" name="supcode" value="<?php echo $_SESSION\["Code"\] ?>"/>
<input type="hidden" name="guid" value="<?php echo $_SESSION\["guid"\] ?>"/>
<?php
}
?>
</table>
<button name="save" type="submit" ><b>SUBMIT</b></button>
</form>
<?php
if (isset($_POST\["save"\]))
{
$itemcode=$_POST\['itemcode'\];
$qty=$_POST\['qty'\];
$supcode=$_POST\['supcode'\];
$guid=$_POST\['guid'\];
$sql = "UPDATE stock_count, stock_count_item SET stock_count.posted = '1', stock_count_item.qty_order = '$qty'
WHERE stock_count.TRANS_GUID = '$guid' AND stock_count_item.Itemcode ='$itemcode'
and stock_count_item.TRANS_GUID = '$guid' ";][1]

Answer 1

An UPDATE query will update all records that are filtered by the WHERE clause. If no WHERE is given, all records are updated:
UPDATE table1 SET field1='value1';
will set the field1 column of all records to value1.
UPDATE table1 SET field1='value1' WHERE field2='value2';
will set the field1 column to value1 or all records where field2 is equal to value2.
So, in your case, the records that are found through the WHERE clause are updated. This is all basic SQL stuff by the way, so I advise you to read up on SQL.
Finally, also use prepared statements in your code to prevent SQL injection.

Answer 2

<table>
<thead>
<tr>
<td><b>Item Code</b></td>
<td><b>Item Barcode</b></td>
<td><b>Item</b></td>
<td><b>QOH</b></td>
<td><b>Quantity</br>Checked</b></td>
<td><b>Quantity</br>Order</b></td>
</tr>
</thead>
<?php
$Barcode=$_SESSION["Barcode"];
$code=$_SESSION["Code"];
$itemcode=$_SESSION["Itemcode"];
$guid=$_SESSION["guid"];
$sql = "SELECT itemmastersupcode.*, itembarcode.*, stock_count_item.*, stock_count.*, po_ex_c.*, d.itemlink_total_qty
FROM itemmastersupcode
WHERE stock_count.SupCode = '$code' and stock_count_item.TRANS_GUID = '$guid'
GROUP BY itemmastersupcode.Itemcode";
$result=mysqli_query($conn2,$sql);
$rowcount = mysqli_num_rows($result);
while($row = mysqli_fetch_assoc($result))
{
?>
<tbody>
<tr>
<td><?php echo $row["Itemcode"]; ?></td>
<td><?php echo $row["Barcode"]; ?></td>
<td><?php echo $row["Description"]; ?></td>
<td><?php echo $row["itemlink_total_qty"]; ?></td>
<td><?php echo $row["qty"]; ?></td>
<form class="form-inline" role="form" method="POST" id="myForm">
<td><input type="number" name="itemcode[<?php echo $row["itemcode"]; ?>][qty]" value=""/></td> //update here
</tr>
</tbody>
<?php
}
?>
</table>
<input type="hidden" name="supcode" value="<?php echo $_SESSION["Code"] ?>"/> //update here
<input type="hidden" name="guid" value="<?php echo $_SESSION["guid"] ?>"/>//update here
<button name="save" type="submit" ><b>SUBMIT</b></button>
</form>
Php content
<?php
if (isset($_POST["save"]))
{
$itemcodes=$_POST['itemcode'];
$qty=$_POST['qty'];
$supcode=$_POST['supcode'];
$guid=$_POST['guid'];
$sql = "UPDATE stock_count, stock_count_item SET
stock_count.posted = '1',
stock_count_item.qty_order = CASE stock_count_item.Itemcode";
foreach( $itemcodes as $itmcode=>$qty)
{
$sql.=" WHEN ".$itmcode." THEN ".$qty
}
$sql.=" END WHERE stock_count.TRANS_GUID =$guid AND stock_count_item.TRANS_GUID=$guid AND stock_count_item.Itemcode IN (".implode(",",array_keys( $itemcodes)).") ";
?>
Hope it will help