How do I update the string subject code in php

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The logical error here is every time I edit the subject code nothing happens.

here's my code:

PHP

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

    $sub_code=$_POST['sub_code_txt'];
    $semester=$_POST['semestertxt'];
    $subject_name=$_POST['subtxt'];
    $units=$_POST['units_txt'];
    $note=$_POST['notetxt'];

    $sql_update=mysql_query("UPDATE subjects SET

                            sub_code='$sub_code',//this is the problem, cannot be updated
                            semester='$semester',
                            subject_name='$subject_name',
                            units='$units',
                            note='$note'

                        WHERE sub_code='$sub_code'
                    ");

<tr>
     <td>Subject Code</td>
        <td>
            <input type="text" name="sub_code_txt" id="textbox" value="<?php echo $rs_upd['sub_code'];?>"  />
         </td>
</tr>

Posted 22-Sep-15 11:45am

Saks Pan

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Comments

Mohibur Rashid 23-Sep-15 20:21pm

Yeah, the query is written that way.
you want to update sub_code to $sub_code and it would only happen only if the sub_code is already equal to $sub_code. in other word:
"UPDATE subject SET sub_code='sub_01' WHERE sub_code='sub_01';", will it change anything?

Also take a look at sql injection

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