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Asked: 2026-06-06T14:05:29+00:00

I’m having a strange problem. I have a HTML page with PHP code which

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I’m having a strange problem. I have a HTML page with PHP code which inserts data to a MySQL database. The data gets saved to the DB without any errors but in an incorrect order.

Here’s a screenshot. The table on the right side displays the existing records. The first 2 records are shown correctly.
enter image description here
But when I save more records, it displays like this.
enter image description here
enter image description here

Even in the MySQL table, the records are inserted that way.

enter image description here

I’m not sure where exactly the problem is so I’ve shown the whole code for the page below. I’ve commented what each code block does. Please comment if you need me to clarify something.

The Location ID is an auto-generated code.

<html>
<head>
<script language="javascript">
function SelectAll(source)
{   //The code for the 'Select All' checkbox
    checkboxes = document.getElementsByTagName("input");
    for(var i in checkboxes)
    {
        if(checkboxes[i].type == 'checkbox')
        {
            checkboxes[i].checked = source.checked;
        }
    }
}
</script>
</head>
<body>

<?php
//Database connection initialization
require_once("db_handler.php");

$conn = iniCon();
$db = selectDB($conn);

/* Generating the new Location ID */
$query = "SELECT LID FROM locations ORDER BY LID DESC LIMIT 1";
$result = mysql_query($query, $conn);
$row = mysql_fetch_array($result);
$last_id = $row['LID'];

$id_letter = substr($last_id, 0, 1);
$id_num = substr($last_id, 1) + 1;
$id_num = str_pad($id_num, 3, "0", STR_PAD_LEFT);
//$id_num = sprintf("%03d", $id_num);
$new_id = $id_letter . $id_num;

/* Displaying the exsisting locations */        
$query = "SELECT * FROM locations";
$result = mysql_query($query, $conn);

$count = mysql_num_rows($result);

?>

<! The table which displays the existing records >
<div id="display">
<b>Locations</b><br/><br/>
<form name="displayLocs" action="<?php echo $PHP_SELF; ?>" method="post" >
<table border="1">
    <tr>
        <th>Location ID</th>
        <th>Code</th>
        <th>Location</th>
        <th><i>Delete</i></th>
    </tr>
    <?php
    while($row = mysql_fetch_array($result))
    { 
    ?>
    <tr>
        <td align="center"><? echo $row["LID"]; ?></td>
        <td align="center"><? echo $row["Code"]; ?></td>
        <td><? echo $row["Location"]; ?></td>
        <td align="center"><input type="checkbox" name="checkbox[]" value="<? echo $row["LID"]; ?>" /></td>
    </tr>
    <?php
    }
    ?>
</table>

<br/>
    <div id="buttons2">
          <input type="checkbox" onclick="SelectAll(this)" />Select All <input type="reset" value="Clear" /> <input type="submit" value="Delete" name="deletebtn" />
    </div>
</form>
</div>

<! New record saving area >
<b id="loc_caption_1">Enter a new location</b>
<div id="loca">
    <form name="locForm" action="<?php echo $PHP_SELF; ?>" method="post" >
        <table width="300" border="0">
          <tr>
            <td>Location ID</td>
            <td><input type="text" name="lid" readonly="readonly" value="<?php echo $new_id; ?>" style="text-align:right" /></td>
          </tr>
          <tr>
            <td>Code</td>
            <td><input type="text" name="code" style="text-align:right" /></td>
          </tr>
          <tr>
            <td>Location</td>
            <td><input type="text" name="loc" style="text-align:right" /></td>
          </tr>
        </table>
</div>
<br/>
<div id="buttons">
    <input type="reset" value="Clear" /> <input type="submit" value="Save" name="savebtn" />
</div>
    </form>

<?php
//Saving record
if(isset($_POST["savebtn"]))
{
    $id = $_POST["lid"];
    $code = $_POST["code"];
    $location = $_POST["loc"];

    $query = "INSERT INTO locations(LID, Code, Location) VALUES('$id', '$code', '$location')";
    $result = mysql_query($query, $conn);

    if (!$result)
    {
        die("Error " . mysql_error());
    }
    else
    {
        echo "<br/><br/>";
        echo "<strong>1 record added successfully!</strong>";
        echo "<meta http-equiv=\"refresh\" content=\"3;URL=locations.php\">";
    }

    mysql_close($conn);
}

//Deleting selected records
if(isset($_POST["deletebtn"]))
{
    for($i = 0; $i < $count; $i++)
    {
        $del_id = $_POST["checkbox"][$i];
        $query = "DELETE FROM locations WHERE LID = '$del_id' ";
        $result = mysql_query($query, $conn);
    }

    if (!$result)
    {
        die("Error " . mysql_error());
    }
    else
    {
        echo "<meta http-equiv=\"refresh\" content=\"0;URL=locations.php\">";
    }

    mysql_close($conn);
}

?>

</body>
</html>

Can anyone please tell me what is causing this and how to rectify it.

Thank you.

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1 Answer

  1. Editorial Team

    The records in the database are stored in the database in no particular order (well, there’s some order to it, but it’s up to the engine to determine it). If you want to get the results in a particular order, then you need to explicitly specify it when querying the data. In your case, make this change:

    /* Displaying the exsisting locations */        
$query = "SELECT * FROM locations ORDER BY lid";
$result = mysql_query($query, $conn);
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