PHP Simple Update using PDO in Bootstrap Tutorial

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Update Statement is very common and used to update or edit existing records in database.PHP Simple Update using PDO in Bootstrap is a tutorial in which we will learn how to update data in database using PDO (PHP Data Objects) prepared statements while using Bootstrap CSS Framework. We will create table fist and then insert some records in it, then we will create a form for update. Then we will use Post method in form to send values to another page and then we will get values, bind them and use them in prepare statements. Finally we will show the success message if everything updated successfully. This tutorial contains demo and source in which you can test INSERT, DELETE and SELECT options at one place. We will learn

• How to create a fruit list table for demo.
• How to make a Connection Page.
• How to prepare query for update
• How to bind values for query.
• How to execute update query.
• How to show a success message for update.

Source Code Folder contains many files and folders, below is the explanation of each files and folders.

• sql.txt contains full database structure along with sample data.
• index.php is a startup page which contains try it button.
• AdminIndex.php is a page which has various options like INSERT, UPDATE, DELETE, SELECT buttons along with tables for showing data.
• FruitUMy.php is about prepared query for data update functionality.
• configPDO.php is a file which will create connection with MySQL database.
• footer.php is a file which contains footer bar and form for Fruit name update.
• assets folder contains necessary css files, icons, images and js files.

1. We will create sample table in our database using sql.txt file which contains following table create queries and sample data for demo and test.
• fruitsratelist table contains fields like Fruitname and its Rate.

• CREATE TABLE IF NOT EXISTS `fruitsratelist` (
    `Fruitname` varchar(15) NOT NULL,
    `Rate` double NOT NULL
  ) ENGINE=MyISAM DEFAULT CHARSET=latin1;

• INSERT INTO `fruitsratelist` (`Fruitname`, `Rate`) VALUES
  ('Apple', 70),
  ('Apple', 90),
  ('Mango', 60),
  ('Banana', 70),
  ('Strawberry', 80),
  ('Apple', 40),
  ('Lemon', 70),
  ('Kiwi', 80);

2. We will create a button for UPDATE inside option side nav in AdminIndex.php page with id updateit and set data-toggle as modal for showing reference DIV in a modal. We set button class as warning button.

• <a href="#updateit" data-toggle="modal" class="btn btn-warning">Update</a>
  

3. Modal will be open when Update Button pressed which will display below form for Update of Fruit rates. Form code is in footer.php page which is included in AdminIndex.php. This form contains current fruit names all other fruit names in drop down select option for update. When we press Change Druit Name Button it will send values as POST method to FruitUMy.php.

• <div id="updateit" class="modal hide fade" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
   <div class="modal-header">
  <button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
  <h3 id="myModalLabel">Update Fruit Name</h3>
  </div>
  <div class="modal-body">
  <form class="form-horizontal" method="post" action="FruitUMy.php">
  
  <div class="control-group">
  <label class="control-label" for="Fruitname1">Fruit Name</label>
  <div class="controls">
  <select name="Fruitname1" id="Fruitname1"  required="required">
  <option value="">Current Fruit Name</option>
  <?php
  include("configPDO.php");
  // We Will prepare SQL Query
      $STM = $dbh->prepare("SELECT DISTINCT  Fruitname FROM fruitsratelist");
  // bind parameters , Named parameters  always start with colon(:)
      $STM->execute();
  // we will fetch records like this and use foreach loop to show multiple Results
      $STMrecords = $STM->fetchAll();
      foreach($STMrecords as $row)
          {
       echo"<option value='$row[0]'>$row[0]</option>"; 
    }        
    ?> 
              </select>           
  </div>
  </div>
  <div class="control-group">
  <label class="control-label" for="Fruitname2">Fruit Name</label>
   <div class="controls">
            <select name="Fruitname2" id="Fruitname2"  required="required">
                <option value="">New Fruit Name</option>
                <option value="Banana">Banana</option>
                <option value="Pear">Pear</option>
                <option value="Orange">Orange</option>
                <option value="Kiwi">Kiwi</option>
                <option value="Mango">Mango</option>       
                <option value="Lemon">Lemon</option>
                <option value="Peach">Peach</option>
                <option value="Cherry">Cherry</option>
                <option value="Strawberry">Strawberry</option>
                <option value="Apricot">Apricot</option>
                <option value="Apple">Apple</option>
            </select>          
   </div>
  </div>
  <div class="control-group">
   <div class="controls">
                  <input type="submit" name="submit" id="submit" class="btn btn-warning" value="Change Fruit Name">
   </div>
  </div>
  </form>
  
   </div>
  </div> 

4. configPDO.php file use a PDO (PHP Data Objects) for connecting MySQL Database.

• <?php
  // mysql hostname
  $hostname = 'localhost';
  // mysql username
  $username = 'root';
  // mysql password
  $password = '';
  // Database Connection using PDO
  try {
  $dbh = new PDO("mysql:host=$hostname;dbname=YourDatabaseName", $username, $password);
      }
  catch(PDOException $e)
      {
      echo $e->getMessage();
      }
  ?>

5. Now we will discuss our FruitUMy.php which is used for getting values from form and then Update these in database using PDO query.

• <?php
  // We will include connection file first
  include('configPDO.php');
  // check if variable is set and Change Fruit Name Button pressed.
  if(isset($_POST["submit"])=="Change Fruit Name")
  {
  // Define Variables and getting values.
  $Fruitname1   =  $_POST[Fruitname1];     //Fruitname1
  $Fruitname2   =  $_POST[Fruitname2];     //Fruitname2
  
  // We Will prepare SQL Query
      $STM = $dbh->prepare("UPDATE fruitsratelist SET Fruitname=:Fruitname2 WHERE Fruitname=:Fruitname1");
  // bind parameters, Named parameters always start with colon(:)
      $STM->bindParam(':Fruitname1', $Fruitname1);
   $STM->bindParam(':Fruitname2', $Fruitname2);
  // For Executing prepared statement we will use below function
      $STM->execute();
  // We use header here for redirecting it to other page where we will show success message.
  header( "location:AdminIndex.php?FruitstatsUpdated=77083368");             
  }
  ?>

There are three various methods to write PDO queries.
• In this Demo we used named parameters key with prepared statement. Binding parameter is must before execution using this method.

• $STM = $dbh->prepare("UPDATE fruitsratelist SET Fruitname=:Fruitname2 WHERE Fruitname=:Fruitname1");
  $STM->bindParam(':Fruitname1', $Fruitname1);
  $STM->bindParam(':Fruitname2', $Fruitname2);
  $STM->execute();
  

OR
• Other method is to use unnamed parameters with question mark (?)

• $STM = $dbh->prepare("UPDATE fruitsratelist SET Fruitname=? WHERE Fruitname=?");
  $STM->bindParam(':Fruitname1', $Fruitname1);
  $STM->bindParam(':Fruitname2', $Fruitname2);
  $STM->execute();
  

OR
• Below method is without binding and it can make code ripe for SQL Injections.

• $STM = $dbh->prepare("UPDATE fruitsratelist SET Fruitname=$Fruitname1 WHERE Fruitname=$Fruitname2");
  $STM->execute();
  

• For Getting how many records Updated we can use rowcount() function.

• $Records_Updated= $STM->rowCount();
  

6. After data Updated We will redirected to Adminindex.php page where we will show success message using codes return from FruitUMy.php

• if($_GET["FruitstatsUpdated"]==77083368)  
  {
  echo "<div class='alert alert-success'>"; 
  echo "<button type='button' class='close' data-dismiss='alert'>×</button>"; 
  echo "<h4>Updated.</h4>"; 
  echo "Fruit Name updated in this Demo System."; 
  echo "</div>";
  }

We used following tools and technologies for developing PHP Simple Update using PDO in Bootstrap Tutorial.
• PHP as Server Side Scripting Language
• MySQL as a Database.
• Bootstrap as CSS Framework.
• JQuery as a service.
• jqBootstrapValidation for validating sign-in form.
• phpMyAdmin for creating database and tables.
• Sublime Text 2+ as a code editor.
• XAMPP as a package for Apache web server, PHP and MySQL.
• Google Chrome as a browser for testing.
Thanks for reading. Enjoy and share with friends.

We hope you will like PHP Simple Update using PDO in Bootstrap Tutorial and find it easy. We used latest PDO (PHP Data Objects) Prepared statements in this tutorial with Bootstrap CSS Framework for making this quickly. For any query/suggestions please send message on our Facebook Page.