Delete Multiple Row using PDO in PHP

June 2, 2020
PHP
Delete Multiple Row using PDO in PHP

In this tutorial, we will create a Delete Multiple Row using PDO. This code can contain multiple delete data in the database server with the PDO query. The system uses PHP POST to call a specific function that can delete information that has been checked via javascript code to use the PDO DELETE query that will remove data in the table by providing an id in the WHERE clause. This a user-friendly program; feel free to modify and use it for your system.

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

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

Delete Multiple Row using PDO in php

Creating the database connection

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

<?php
    $conn = new PDO( 'mysql:host=localhost;dbname=db_pdo_multiple', 'root', '');
    if(!$conn){
        die("Error: Failed to coonect to database!");
    }
?>

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 your text editor, then save it as index.php.

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8" name="viewport" content="width=device-width, initial-scale=1"/>
        <link rel="stylesheet" type="text/css" href="css/bootstrap.css"/>
    </head>
<body>
    <nav class="navbar navbar-default">
        <div class="container-fluid">
            <a class="navbar-brand" href="https://sourcecodester.com">Sourcecodester</a>
        </div>
    </nav>
    <div class="col-md-3"></div>
    <div class="col-md-6 well">
        <h3 class="text-primary">PHP - Delete Multiple Row Using PDO</h3>
        <hr style="border-top:1px dotted #ccc;"/>
        <button class="btn btn-success" type="button" data-toggle="modal" data-target="#form_modal"><span class="glyphicon glyphicon-plus"></span> Add Member</button>
        <br /><br />
        <table class="table table-bordered">
            <form method="POST" action="delete.php">	
                <thead class="alert-info">
                    <tr>
                        <th><input type="checkbox" onclick="selectedCheckbox(this)"> Select All</th>
                        <th>Firstname</th>
                        <th>Lastname</th>
                        <th>Address</th>
                    </tr>
                </thead>
                <tbody style="background-color:#fff;">
                    <?php
                        require 'conn.php';
                        $query = $conn->prepare("SELECT * FROM `member`");
                        $query->execute();
                        $count_query = $conn->prepare("SELECT COUNT(*) as count FROM `member`");
                        $count_query->execute();
                        $row = $count_query->fetch();
                        $count=$count=$row['count'];
                        while($fetch = $query->fetch()){
                    ?>
                    <tr>
                        <?php
                            if($count != 0){
                        ?>
                            <td><input type="checkbox" name="check[]" onclick="countCheckbox()" value="<?php echo $fetch['mem_id']?>"></td>
                        <?php
                            }
                        ?>
                        <td><?php echo $fetch['firstname']?></td>
                        <td><?php echo $fetch['lastname']?></td>
                        <td><?php echo $fetch['address']?></td>
                    </tr>
                    <?php
                        }
                    ?>
                </tbody>
                <?php
                    if($count != 0){
                ?>
                <tfoot>
                    <tr>
                        <td colspan="5"><button name="delete" class="btn btn-danger pull-right"><span id="count" class="badge">0</span> Delete</button></td>
                    </tr>
                </tfoot>
                <?php
                    }
                ?>
            </form>
        </table>
    </div>
    <div class="modal fade" id="form_modal" aria-hidden="true">
        <div class="modal-dialog">
            <div class="modal-content">
                <form method="POST" action="save.php">	
                    <div class="modal-header">
                        <h3 class="modal-title">Add 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 type="text" name="firstname" class="form-control" required="required"/>
                            </div>
                            <div class="form-group">
                                <label>Lastname</label>
                                <input type="text" name="lastname" class="form-control" required="required"/>
                            </div>
                            <div class="form-group">
                                <label>Address</label>
                                <input type="text" name="address" class="form-control" required="required"/>
                            </div>
                        </div>
                    </div>
                    <div style="clear:both;"></div>
                    <div class="modal-footer">
                        <button name="save" class="btn btn-primary"><span class="glyphicon glyphicon-save"></span> Save</button>
                        <button class="btn btn-danger" type="button" data-dismiss="modal"><span class="glyphicon glyphicon-remove"></span> Close</button>
                    </div>
                </form>	
            </div>
        </div>
    </div>
<script src="js/jquery-3.2.1.min.js"></script>
<script src="js/bootstrap.js"></script>
<script src="js/script.js"></script>
</body>
</html>

Creating PHP Query

This code contains the php query of the application. This code will store the data inputs to the database server. To do that just copy and write this block of codes inside the text editor, then save it as save.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);
            $sql = "INSERT INTO `member` (`firstname`, `lastname`, `address`) VALUES ('$firstname', '$lastname', '$address')";
            $conn->exec($sql);
        }catch(PDOException $e){
            echo $e->getMessage();
        }
 
        $conn = null;
 
        header('location: index.php');
    }
 
?>

Creating the Main Function

This code contains the main function of the application. This code will delete multiple row table using PDO when the button is clicked. To make this just copy and write these block of codes below inside the text editor, then save it as shown below.
delete.php

<?php
    require_once 'conn.php';
 
    if(ISSET($_POST['delete'])){
        if(ISSET($_POST['check'])){
            $checked = $_POST['check'];
            for($i=0; $i < count($checked); $i++){
                $id = $checked[$i];
                $query = $conn->prepare("DELETE from `member` WHERE `mem_id`='$id'");
                $query->execute();
            }
 
            header('location:index.php');
        }else{
            echo "<script>alert('Please select an item first!')</script>";
            echo "<script>window.location='index.php'</script>";
        }
    }		
?>

script.js
Note: To make this script work make sure you save this file inside the js directory.

function selectedCheckbox(check){
    var checkboxes = document.getElementsByName('check[]');
    for(var i in checkboxes){
        checkboxes[i].checked = check.checked;
    }
 
    var count = document.querySelectorAll('input[name="check[]"]:checked').length;
    document.getElementById('count').innerHTML = count;
}
 
function countCheckbox(){
    var count = document.querySelectorAll('input[name="check[]"]:checked').length;
    document.getElementById('count').innerHTML = count;
}

There you have it we successfully created a Delete Multiple Row 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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