Lesson 6 of 11By Ravikiran A S
CRUD Operations are typically performed on databases, hence, in this PHP CRUD Operations tutorial, you will implement CRUD techniques on MySQL databases with the help of PHP.
The CRUD acronym comprises all the major operations that are performed on a relational database. It stands for:
C = Create
R = Read
U = Update
D = Delete
You will now understand the different operations in detail.
First, create a connection between the database and your PHP code.
The following code acts as the connection between the webpage and the database where the data from the webpage will be stored.
Here, name the file as config.php
<?php
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "mydb";
$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
?>
The first operation in PHP CRUD Operations, Create, is responsible for creating tables or new records into an existing table. To do that, first, you must write the code for the webpage to create an entry in the database.
Name the file as create.php.
<?php
include "config.php";
if (isset($_POST['submit'])) {
$first_name = $_POST['firstname'];
$last_name = $_POST['lastname'];
$email = $_POST['email'];
$password = $_POST['password'];
$gender = $_POST['gender'];
$sql = "INSERT INTO `users`(`firstname`, `lastname`, `email`, `password`, `gender`) VALUES ('$first_name','$last_name','$email','$password','$gender')";
$result = $conn->query($sql);
if ($result == TRUE) {
echo "New record created successfully.";
}else{
echo "Error:". $sql . "<br>". $conn->error;
}
$conn->close();
}
?>
<!DOCTYPE html>
<html>
<body>
<h2>Signup Form</h2>
<form action="" method="POST">
<fieldset>
<legend>Personal information:</legend>
First name:<br>
<input type="text" name="firstname">
<br>
Last name:<br>
<input type="text" name="lastname">
<br>
Email:<br>
<input type="email" name="email">
<br>
Password:<br>
<input type="password" name="password">
<br>
Gender:<br>
<input type="radio" name="gender" value="Male">Male
<input type="radio" name="gender" value="Female">Female
<br><br>
<input type="submit" name="submit" value="submit">
</fieldset>
</form>
</body>
</html>
This page displays a signup form that stores the details entered on the page into the table named ‘users’.
The second operation, just as the name suggests, ‘Read’ is used to display or read the data that is already available in the database.
To perform the operation, you need to create a page that displays the records from the table ‘users’.
Now, name the page as view.php
<?php
include "config.php";
$sql = "SELECT * FROM users";
$result = $conn->query($sql);
?>
<!DOCTYPE html>
<html>
<head>
<title>View Page</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/css/bootstrap.min.css">
</head>
<body>
<div class="container">
<h2>users</h2>
<table class="table">
<thead>
<tr>
<th>ID</th>
<th>First Name</th>
<th>Last Name</th>
<th>Email</th>
<th>Gender</th>
<th>Action</th>
</tr>
</thead>
<tbody>
<?php
if ($result->num_rows > 0) {
while ($row = $result->fetch_assoc()) {
?>
<tr>
<td><?php echo $row['id']; ?></td>
<td><?php echo $row['firstname']; ?></td>
<td><?php echo $row['lastname']; ?></td>
<td><?php echo $row['email']; ?></td>
<td><?php echo $row['gender']; ?></td>
<td><a class="btn btn-info" href="update.php?id=<?php echo $row['id']; ?>">Edit</a> <a class="btn btn-danger" href="delete.php?id=<?php echo $row['id']; ?>">Delete</a></td>
</tr>
<?php }
}
?>
</tbody>
</table>
</div>
</body>
</html>
The third operation i.e, ‘update’ is used to change or modify the already existing data present in the database.
To do this, you need to create another page to update the details in the database. Here, name the page as update.php
<?php
include "config.php";
if (isset($_POST['update'])) {
$firstname = $_POST['firstname'];
$user_id = $_POST['user_id'];
$lastname = $_POST['lastname'];
$email = $_POST['email'];
$password = $_POST['password'];
$gender = $_POST['gender'];
$sql = "UPDATE `users` SET `firstname`='$firstname',`lastname`='$lastname',`email`='$email',`password`='$password',`gender`='$gender' WHERE `id`='$user_id'";
$result = $conn->query($sql);
if ($result == TRUE) {
echo "Record updated successfully.";
}else{
echo "Error:" . $sql . "<br>" . $conn->error;
}
}
if (isset($_GET['id'])) {
$user_id = $_GET['id'];
$sql = "SELECT * FROM `users` WHERE `id`='$user_id'";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
while ($row = $result->fetch_assoc()) {
$first_name = $row['firstname'];
$lastname = $row['lastname'];
$email = $row['email'];
$password = $row['password'];
$gender = $row['gender'];
$id = $row['id'];
}
?>
<h2>User Update Form</h2>
<form action="" method="post">
<fieldset>
<legend>Personal information:</legend>
First name:<br>
<input type="text" name="firstname" value="<?php echo $first_name; ?>">
<input type="hidden" name="user_id" value="<?php echo $id; ?>">
<br>
Last name:<br>
<input type="text" name="lastname" value="<?php echo $lastname; ?>">
<br>
Email:<br>
<input type="email" name="email" value="<?php echo $email; ?>">
<br>
Password:<br>
<input type="password" name="password" value="<?php echo $password; ?>">
<br>
Gender:<br>
<input type="radio" name="gender" value="Male" <?php if($gender == 'Male'){ echo "checked";} ?> >Male
<input type="radio" name="gender" value="Female" <?php if($gender == 'Female'){ echo "checked";} ?>>Female
<br><br>
<input type="submit" value="Update" name="update">
</fieldset>
</form>
</body>
</html>
<?php
} else{
header('Location: view.php');
}
}
?>
In the update form, we need to select the user id which we want to update. You can notice that the user id being updated is visible in the URL of the update page in the picture below.
You can view the updated details by opening the view.php webpage.
The last operation of CRUD is Delete and just as the name suggests, it is used to delete an existing entry or table.
To perform this operation, you must create a page that would let you choose the data entry that you want to delete from the database.
Now, name the file delete.php
<?php
include "config.php";
if (isset($_GET['id'])) {
$user_id = $_GET['id'];
$sql = "DELETE FROM `users` WHERE `id`='$user_id'";
$result = $conn->query($sql);
if ($result == TRUE) {
echo "Record deleted successfully.";
}else{
echo "Error:" . $sql . "<br>" . $conn->error;
}
}
?>
This brings us to the end of the “PHP CRUD Operations'' tutorial. In this, you have learned how to perform CRUD operations on a database with the help of PHP by creating, reading, updating, and deleting records using different web pages. Finally, you created a config.php file to connect the web pages with the database to perform the operations.
You can refer here for a video tutorial on CRUD Operations.
Are you planning to take the plunge and do a course on PHP? In that case, Simplilearn’s PHP course would be an excellent choice. The Post Graduate Program in Full Stack Web Development covers all the fundamental and advanced concepts in PHP, making your journey towards learning PHP an easy one.
If you have any queries regarding PHP CRUD Operations, do mention them in the comment section of this tutorial, and we’ll have our experts answer them for you.
Happy Learning!
Ravikiran A S works with Simplilearn as a Research Analyst. He an enthusiastic geek always in the hunt to learn the latest technologies. He is proficient with Java Programming Language, Big Data, and powerful Big Data Frameworks like Apache Hadoop and Apache Spark.
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