Update MySQL Database via HTML and PHP. [Help]

I know this is pretty basic stuff, not done anything with it though for a few years.

I'm looking to update a Database, the structure is like this:

Database
- Website
-- News

Main database > Table > Row.

I know I need to use the UPDATE which I have attempted to do, but no luck, just wondered if anyone can direct me in the right direction.

Cheers.

Edit:

Just to add, this I what I have so far:

HTML Code:

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<form method="post" action="<?php $_PHP_SELF ?>"><textarea border='1' name='NewsUpdate' maxlength='500' cols='125' rows='10'/></textarea><br><center><input size='15'type='submit' value='update' /></center></form>

---

I don't really have experience with PHP, but I do know how to update a database with Python. Are you using MySQL Database? This link looks helpful: http://www.tutorialspoint.com/php/mysql_update_php.htm

PHP Code:

---

<form action='register.php' method='POST'>    
 <table>            
  <tr>                
   <td>                
    Enter your first name:                
   </td>                                
   <td>                
    <input type='text' name='firstname' value='<?php echo $firstname; ?>'>               
   </td>            
  </tr>                        
  <tr>                
  <td>               
   Enter your surname:                
  </td>                                
  <td>                
   <input type='text' name='surname' value='<?php echo $surname; ?>'>                
  </td>            
 </tr>                        
 <tr>                
  <td>                
   Enter your username:                
  </td>                                
  <td>                
   <input type='text' name='username' value='<?php echo $username; ?>'>               
  </td>            
 </tr>                        
 <tr>                
  <td align="left">                
   Enter your password:               
  </td>                                
  <td>               
   <input type='password' name='password'>                
  </td>            
 </tr>                        
 <tr>                
  <td>                
   Repeat your password:                
  </td>                                
  <td>               
   <input type='password' name='verifypassword'>                
  </td>            
 </tr>    
</table>    
 <br>    
  <input type='submit' name='submit' value='Register'>
 </form>
  <br>  
    <?php
       $submit = $_POST['submit'];
       $firstname = strip_tags($_POST['firstname']);
       $surname = strip_tags($_POST['surname']);
       $username = strip_tags($_POST['username']);
       $password = strip_tags($_POST['password']);
       $verifypassword = strip_tags($_POST['verifypassword']);$date = date("Y-m-d");
   
     if ($submit) {            
     $query = mysql_query("SELECT * FROM users WHERE username='$username'");    
     $numrows = mysql_num_rows($query);        

     if($numrows){    die("This user already exists");    }         

     if($firstname&&$surname&&$username&&$password&&$verifypassword) {            
     if($password==$verifypassword) {            
     if(strlen($firstname)>25 || strlen($surname)>25 || strlen($username)>25) {                
     die("Error: Max character limit exceeded - All fields must be below 25 characters");           
     } else if(strlen($password) > 25 || strlen($password) < 6) {              
    die("Error: Your password must be between 6 and 25 characters.");           
    } else                        
    $password = md5($password);            
    $verifypassword =md5($verifypassword);         

     mysql_select_db("yourdb") or die("Error selecting database");                            
    $query = mysql_query("INSERT INTO users VALUES ('','$firstname','$surname','$admin','$username','$password','$date')");                            
  
    die("You have been successfully registered");                            
    } else        echo "Error: Your passwords do not match.";        
    } else    echo "Error: Please fill in <b>every field</b>";           
 }?>

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A bit like that?

I used this in one of website pages years ago. (sorry about the formatting - just had to rejig it in here -.-)

I know the code is an insert into but UPDATE code is very similar (eg. UPDATE tablename SET field='' WHERE otherfield>2;)

Code:

---

if($_POST['submit']){
                                        $_POST['textarea'] = str_replace("'", "'", $_POST['textarea']);
                                        $con->query("UPDATE `website` SET NewsShort = '".$_POST['textarea']."'");
                                        echo "<center><h3>You have changed the news.</h3></center>";
                                        unset($_POST);
                                       
                                }else{
                                        echo "<h2>New News:</h2>
                                        You may add in HTML codes.<br><br>
                                        <form name='input' action='' method='post'>
                                        <textarea border='1' name='textarea' maxlength='500' cols='125' rows='10'/></textarea><br><center><input size='15'type='submit' name='submit'value=' Submit ' /></center>
                                        </form><br>";
                                        $text = $_POST['textarea'];
                                        $submit = $_POST['submit'] = 1;
                                }
                               
                        }
                ?>

---

Did it like that in the end, just the PHP bit there, the field bit isn't difficult.

Quote:

---

Originally Posted by Jack!

Code:

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if($_POST['submit']){
                    $_POST['textarea'] = str_replace("'", "'", $_POST['textarea']);
                    $con->query("UPDATE `website` SET NewsShort = '".$_POST['textarea']."'");
                    echo "<center><h3>You have changed the news.</h3></center>";
                    unset($_POST);
                   
                }else{
                    echo "<h2>New News:</h2>
                    You may add in HTML codes.<br><br>
                    <form name='input' action='' method='post'>
                    <textarea border='1' name='textarea' maxlength='500' cols='125' rows='10'/></textarea><br><center><input size='15'type='submit' name='submit'value=' Submit ' /></center>
                    </form><br>";
                    $text = $_POST['textarea'];
                    $submit = $_POST['submit'] = 1;
                }
               
            }
        ?>

---

Did it like that in the end, just the PHP bit there, the field bit isn't difficult.

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Glad you figured it out. Kinda guessed you would, PHP is a very easy language to understand and manipulate! :D