Complete PDO CRUD in PHP

June 23, 2020
PHP
complete pdo crud in php

In this tutorial, we will create a Complete PDO CRUD using PDO. This code has several functionalities that can manipulate data through database servers using the PDO query. The system uses a PDO query to (Create, Read, Update, Delete) a specific data to a database server with high data protection to avoid data injection tools.

We will be using PDO as a query scripting it an acronym for PHP Data Objects. It is a lean, clean, and consistent way to access databases. This means developers can write portable code much more accessible.

Getting started:

First, you have to download & install XAMPP or any local server that runs PHP scripts. Here’s the link for the XAMPP server https://www.apachefriends.org/index.html.

And, this is the link for the bootstrap that I used for the layout design https://getbootstrap.com/.

Creating Database

Open your database web server, then create a database name in it db_pdo_crud; after that, click Import, then locate the database file inside the folder of the application then click ok.

complete pdo crud in php

Creating the database connection

Open your any kind of text editor(notepadd++, etc..). Then just copy/paste the code below then name it conn.php.

<?php
    $db_username = 'root';
    $db_password = '';
    $conn = new PDO( 'mysql:host=localhost;dbname=db_pdo_crud', $db_username, $db_password );
    if(!$conn){
        die("Fatal Error: Connection Failed!");
    }
?>

Creating The Interface

This is where we will create a simple form for our application. To create the forms simply copy and write it into you text editor, then save it as index.php.

<!DOCTYPE html>
<html lang="en">
    <head>
        <link rel="stylesheet" type="text/css" href="css/bootstrap.css">
        <meta charset="UTF-8" name="viewport" content="width=device-width, initial-scale=1"/>
    </head>
<body>
    <nav class="navbar navbar-default">
        <div class="container-fluid">
            <a href="https://sourcecodester.com" class="navbar-brand">Sourcecodester</a>
        </div>
    </nav>
    <div class="col-md-3"></div>
    <div class="col-md-6 well">
        <h3 class="text-primary">PHP - Complete PDO CRUD</h3>
        <hr style="border-top:1px dotted #ccc;" />
        <div class="col-md-3">
            <form method="POST" action="add.php">
                <div class="form-group">
                    <label>Firstname</label>
                    <input class="form-control" type="text" name="firstname"/>
                </div>
                <div class="form-group">
                    <label>Lastname</label>
                    <input class="form-control" type="text" name="lastname"/>
                </div>
                <div class="form-group">
                    <label>Address</label> 
                    <input class="form-control" type="text" name="address"/>
                </div>
                <div class="form-group">
                    <button class="btn btn-primary form-control" type="submit" name="save">Save</button>
                </div>
            </form>
        </div>
        <div class="col-md-9">
            <table class="table table-bordered">
                <thead class="alert-info">
                    <tr>
                        <th>Firstname</th>
                        <th>Lastname</th>
                        <th>Address</th>
                        <th>Action</th>
                    </tr>
                </thead>
                <tbody>
                    <?php
                        require 'conn.php';
                        $sql = $conn->prepare("SELECT * FROM `user`");
                        $sql->execute();
                        while($fetch = $sql->fetch()){
                    ?>
                    <tr>
                        <td><?php echo $fetch['firstname']?></td>
                        <td><?php echo $fetch['lastname']?></td>
                        <td><?php echo $fetch['address']?></td>
                        <td><button class="btn btn-warning btn-sm" data-toggle="modal" data-target="#update<?php echo $fetch['user_id']?>">Edit</button> | <a class="btn btn-danger btn-sm" href="delete.php?id=<?php echo $fetch['user_id']?>">Delete</a></td>
                    </tr>
 
                    <div class="modal fade" id="update<?php echo $fetch['user_id']?>" aria-hidden="true">
                        <div class="modal-dialog">
                            <div class="modal-content">
                                <form method="POST" action="update.php">
                                    <div class="modal-header">
                                        <h3 class="modal-title">Update User</h3>
                                    </div>	
                                    <div class="modal-body">
                                        <div class="col-md-2"></div>
                                        <div class="col-md-8">
                                            <div class="form-group">
                                                <label>Firstname</label>
                                                <input class="form-control" type="text" value="<?php echo $fetch['firstname']?>" name="firstname"/>
                                                <input type="hidden" value="<?php echo $fetch['user_id']?>" name="user_id"/>
                                            </div>
                                            <div class="form-group">
                                                <label>Lastname</label>
                                                <input class="form-control" type="text" value="<?php echo $fetch['lastname']?>" name="lastname"/>
                                            </div>
                                            <div class="form-group">
                                                <label>Address</label> 
                                                <input class="form-control" type="text" value="<?php echo $fetch['address']?>" name="address"/>
                                            </div>
                                            <div class="form-group">
                                                <button class="btn btn-warning form-control" type="submit" name="update">Update</button>
                                            </div>
                                        </div>	
                                    </div>	
                                    <br style="clear:both;"/>
                                    <div class="modal-footer">
                                        <button class="btn btn-danger" data-dismiss="modal">Close</button>
                                    </div>
                                </form>
                            </div>
                        </div>
                    </div>	
 
                    <?php
                        }
                    ?>
                </tbody>
            </table>
        </div>
    </div>

Creating the Main Function

This code contains the main function of the application. This code can manipulate a data when the button is clicked. To do that write these block of codes inside the text editor and save it as shown below.
add.php

<?php
    require_once 'conn.php';
 
    if(ISSET($_POST['save'])){
        try{
            $firstname = $_POST['firstname'];
            $lastname = $_POST['lastname'];
            $address = $_POST['address'];
            $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
            $sql = "INSERT INTO `user` (`firstname`, `lastname`, `address`) VALUES ('$firstname', '$lastname', '$address')";
            $conn->exec($sql);
        }catch(PDOException $e){
            echo $e->getMessage();
        }
 
        $conn = null;
        header('location:index.php');
    }
?>

update.php

<?php
    require_once 'conn.php';
 
    if(ISSET($_POST['update'])){
        try{
            $user_id = $_POST['user_id'];
            $firstname = $_POST['firstname'];
            $lastname = $_POST['lastname'];
            $address = $_POST['address'];
            $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
            $sql = "UPDATE `user`SET `firstname` = '$firstname', `lastname` = '$lastname', `address` = '$address' WHERE `user_id` = '$user_id'";
            $conn->exec($sql);
        }catch(PDOException $e){
            echo $e->getMessage();
        }
 
        $conn = null;
        header('location:index.php');
    }
?>

delete.php

<?php
    if(ISSET($_GET['id'])){
        require_once 'conn.php';
        $id = $_GET['id'];
        $sql = $conn->prepare("DELETE from `user` WHERE `user_id`='$id'");
        $sql->execute();
        header('location:index.php');
    }
?>

There you have it we successfully created a Complete PDO CRUD using PDO. I hope that this simple tutorial help you to what you are looking for. For more updates and tutorials just kindly visit this site. Enjoy Coding!!!

 

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