Code for Insert View Update Delete In Php MySQL

In this article, we will learn simple PHP & MySQL code to add, edit, delete and view data. This kind of system
is also referred to CRUD (Create, Read, Update, Delete).

Here is a step-by-step guide:

First of all, we will create a new MySQL database. Let us name the database as student_master.

Database Creation :
create database student_master;

Create a new table in database student_master. Let us name the table as student_info.

Table Creation :
create table student_info(id int primary key auto_increment,stud_name text,stud_address text);

Now, we will create a db_file.php file which contains database connection code. 
Database Connectivity : (db_file.php)
$db = new PDO(mysql:host=localhost;dbname=student_master;charset=utf8mb4, root, );

HTML : add.php
<form name="" method="post" action="add_do.php">
    <label>Student Name : </label>
    <input type="text" name="txt_name" placeholder="Enter Student Name *" required>
    <br>
    <label>Student Address : </label>
    <textarea name="txt_address" placeholder="Enter Student Address *" required></textarea>
    <br>
    <button type="submit">Submit</button>
</form>

Form action on add.php is add_do.php. It means that the submitted form data will 
go to add_do.php.

PHP : add_do.php
$txt_name=$_REQUEST[txt_name];
$txt_address=$_REQUEST[txt_address];

$insertQuery=$db->query("insert into student_info(stud_name,stud_address) 
                    values($txt_name,$txt_address)") or die("");

echo "Sucessfully Inserted !...";
header("index.php");

Data from database is fetched and displayed in show.php file. 
This is our homepage. 

<?php include("db_file.php"); ?>
<table border="1">
    <thead>
        <tr>
            <th>S No</th>
            <th>Student Name</th>
            <th>Student Address</th>
            <th>Option</th>
        </tr>
    </thead>
    <tbody>
    <?php $Query=$db->query("select id,stud_name,stud_address from student_info order by id desc") or die(""); 
          $i=0;
          while($Result=$Query->fetch(PDO::FETCH_ASSOC)){
          $i++;
    ?>
        <tr>
            <td><?php echo $i; ?></td>
            <td><?php echo $Result[stud_name]; ?></td>
            <td><?php echo $Result[stud_address]; ?></td>
            <td>
                <a href="delete.php?id=<?php echo $Result[id]; ?>">Delete</a> | 
                <a href="update_record.php?id=<?php echo $Result[id]; ?>">Update</a>
            </td>
        </tr>
    <?php } ?>
    </tbody>
</table>

Delete : (delete.php)
include("db_file.php");

$id=$_REQUEST[id];
$delQuery=$db->query("") or die("");
echo "Sucessfully Deleted !...";
header("index.php");

Update : update.php
<?php 
    include("db_file.php");
    $id=$_REQUEST[id];
    $query=$db->query("select id,stud_name,stud_address from student_info where id=$id") or die("");
    $res=$query->fetch(PDO::FETCH_ASSOC);
 ?>
<form name="" method="post" action="update_do.php">
    <label>Student Name : </label>
    <input type="text" name="txt_name" value="<?php echo $res[stud_name]; ?>" placeholder="Enter Student Name *" required>
    <input type="hidden" id="txt_hide" value="<?php echo $res[id]; ?>">
    <br>
    <label>Student Address : </label>
    <textarea name="txt_address" placeholder="Enter Student Address *" required><?php echo $res[stud_address]; ?></textarea>
    <br>
    <button type="submit">Submit</button>
</form>

Update PHP : update_do.php

include("db_file.php");
$txt_hide=$_REQUEST[txt_hide];
$txt_name=$_REQUEST[txt_name];
$txt_address=$_REQUEST[txt_address];

$insertQuery=$db->query("update student_info set stud_name=$txt_name,stud_address=$txt_address where id=$txt_hide)") or die("");

echo "Sucessfully Updated !...";
header("index.php");