Use of Insert Update and Delete in PHP
Create records and send data in database table
To insert a data into a database we use the Insert query
add_student.php
<?php
if (isset($_POST['submit'])){
$name = $_POST['name'];
$address = $_POST['address'];
$class = $_POST['class'];
$connection = mysqli_connect('localhost', 'root', '', 'school');
if ($connection){
echo "Your connection has been established";
}else{
die("Please try again");
}
// Using INSERT query
$query = "INSERT INTO students(name,address,class)";
$query.= "VALUES('$name','$address','$class')";
$result = mysqli_query($connection, $query);
if (!$result){
die('query FAILED' . mysqli_error());
}else{
echo "Student Saved";
}
}
?>
<html>
<head>
<title>This is demo</title>
<meta charset="utf-8">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<h2>Student Add Form</h2>
<form class="form-horizontal" action="add_student.php" method="post">
<div class="form-group">
<label class="control-label col-sm-2">Name:</label>
<div class="col-sm-7">
<input type="text" class="form-control" id="name" placeholder="Enter Name" name="name">
</div>
</div>
<div class="form-group">
<label class="control-label col-sm-2">Address:</label>
<div class="col-sm-7">
<input type="text" class="form-control" id="address" placeholder="Enter Address" name="address">
</div>
</div>
<div class="form-group">
<label class="control-label col-sm-2">Class:</label>
<div class="col-sm-7">
<input type="text" class="form-control" id="class" placeholder="Enter Class" name="class">
</div>
</div>
<div class="form-group">
<div class="col-sm-offset-2 col-sm-10">
<button type="submit" name="submit" class="btn btn-success">Update</button>
</div>
</div>
</form>
</div>
</body>
</html>Use of print_r function in PHP
The print_r() function is used to print the data .It is used to read the information in the database with PHP.
students.php
<?php
$connection = mysqli_connect('localhost', 'root', '', 'school');
If ($connection) {
echo "Your connection has been established";
} else {
die("Please try again");
}
$query = "SELECT * FROM students";
$result = mysqli_query($connection, $query);
if (!$result) {
die('query FAILED' . mysqli_error());
}
?>
<html>
<head>
<title>This is demo</title>
<meta charset="utf-8">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<h2>Student Form</h2>
<?php
while ($row = mysqli_fetch_assoc($result)) {
print_r($row);
}
?>
</div>
</body>
</html> Output
Updata data in PHP
student_update.php
<?php
if (isset($_POST['submit'])) {
$id = $_POST['id'];
$name = $_POST['name'];
$address = $_POST['address'];
$class = $_POST['class'];
$connection = mysqli_connect('localhost', 'root', '', 'school');
If ($connection) {
echo "Your connection has been established";
} else {
die("Please try again");
}
// Using UPDATE query
$query = "UPDATE students SET name = '$name',address = '$address', class = '$class' " . "WHERE id = $id";
$result = mysqli_query($connection, $query);
if (!$result) {
die('query FAILED' . mysqli_error());
}
}
?>
<html>
<head>
<title>This is demo</title>
<meta charset="utf-8">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<h2>Student Form</h2>
<form class="form-horizontal" action="student_update.php" method="post">
<div class="form-group">
<label class="control-label col-sm-2">Id:</label>
<div class="col-sm-7">
<input type="text" class="form-control" id="Id" name="id">
</div>
</div>
<div class="form-group">
<label class="control-label col-sm-2">Name:</label>
<div class="col-sm-7">
<input type="text" class="form-control" id="name" placeholder="Enter Name" name="name">
</div>
</div>
<div class="form-group">
<label class="control-label col-sm-2">Address:</label>
<div class="col-sm-7">
<input type="text" class="form-control" id="address" placeholder="Enter Address" name="address">
</div>
</div>
<div class="form-group">
<label class="control-label col-sm-2">Class:</label>
<div class="col-sm-7">
<input type="text" class="form-control" id="class" placeholder="Enter Class" name="class">
</div>
</div>
<div class="form-group">
<div class="col-sm-offset-2 col-sm-10">
<button type="submit" name="submit" class="btn btn-success">Update</button>
</div>
</div>
</form>
</div>
</body>
</html>Delete the record from the database in PHP
student_delete.php
<?php
if (isset($_POST['submit'])) {
$id = $_POST['id'];
$connection = mysqli_connect('localhost', 'root', '', 'school');
If ($connection) {
echo "Your connection has been established";
} else {
die("Please try again");
}
$query = "DELETE FROM students WHERE id= $id";
$result = mysqli_query($connection, $query);
if (!$result) {
die('query FAILED' . mysqli_error());
}
}
?>
<html>
<head>
<title>This is demo</title>
<meta charset="utf-8">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<h2>Student Form</h2>
<form class="form-horizontal" action="student_delete.php" method="post">
<div class="form-group">
<label class="control-label col-sm-2">Id:</label>
<div class="col-sm-7">
<input type="text" class="form-control" id="Id" name="id">
</div>
</div>
<div class="form-group">
<div class="col-sm-offset-2 col-sm-10">
<button type="submit" name="submit" class="btn btn-success">Delete</button>
</div>
</div>
</form>
</div>
</body>
</html>
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