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‎README.md‎

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# crud-php-complete
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Complete Create, Read, Update, Delete (CRUD) in PHP & MySQL
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========
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A complete CRUD system to add, edit, delete and view using PHP and MySQL. Complete in a sense that this system has login and register feature as well. I have another repository with [Simple CRUD System](https://github.com/chapagain/crud-php-simple) which doesn't have login and register feature.
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Blog Article: [CRUD Create, Read, Update, Delete in PHP & MySQL with Login & Register: A simple & complete tutorial](http://blog.chapagain.com.np/crud-create-read-update-delete-php-mysql-login-register/)
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At first, users need to register and login. After successful login, users can add their product data. Users can see only those data that they have added.
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SQL script to create database and tables is present in **database.sql** file.
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‎add.html‎

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<html>
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<head>
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<title>Add Data</title>
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</head>
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<body>
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<a href="index.php">Home</a> | <a href="view.php">View Products</a> | <a href="logout.php">Logout</a>
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<br/><br/>
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<form action="add.php" method="post" name="form1">
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<table width="25%" border="0">
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<tr>
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<td>Name</td>
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<td><input type="text" name="name"></td>
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</tr>
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<tr>
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<td>Quantity</td>
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<td><input type="text" name="qty"></td>
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</tr>
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<tr>
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<td>Price</td>
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<td><input type="text" name="price"></td>
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</tr>
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<tr>
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<td></td>
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<td><input type="submit" name="Submit" value="Add"></td>
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</tr>
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</table>
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</form>
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</body>
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</html>
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‎add.php‎

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<?php session_start(); ?>
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<?php
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if(!isset($_SESSION['valid'])) {
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header('Location: login.php');
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}
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?>
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<html>
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<head>
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<title>Add Data</title>
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</head>
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<body>
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<?php
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//including the database connection file
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include_once("connection.php");
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if(isset($_POST['Submit'])) {
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$name = $_POST['name'];
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$qty = $_POST['qty'];
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$price = $_POST['price'];
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$loginId = $_SESSION['id'];
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// checking empty fields
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if(empty($name) || empty($qty) || empty($price)) {
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if(empty($name)) {
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echo "<font color='red'>Name field is empty.</font><br/>";
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}
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if(empty($qty)) {
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echo "<font color='red'>Quantity field is empty.</font><br/>";
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}
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if(empty($price)) {
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echo "<font color='red'>Price field is empty.</font><br/>";
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}
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//link to the previous page
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echo "<br/><a href='javascript:self.history.back();'>Go Back</a>";
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} else {
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// if all the fields are filled (not empty)
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//insert data to database
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$result = mysql_query("INSERT INTO products(name, qty, price, login_id) VALUES('$name','$qty','$price', '$loginId')");
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//display success message
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echo "<font color='green'>Data added successfully.";
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echo "<br/><a href='view.php'>View Result</a>";
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}
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}
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?>
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</body>
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</html>

‎connection.php‎

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<?php
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// mysql_connect("database-host", "username", "password")
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$conn = mysql_connect("localhost","root","root")
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or die("cannot connected");
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// mysql_select_db("database-name", "connection-link-identifier")
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@mysql_select_db("test2",$conn);
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?>

‎database.sql‎

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create database `test2`;
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use `test2`;
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CREATE TABLE `login` (
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`id` int(9) NOT NULL auto_increment,
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`name` varchar(100) NOT NULL,
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`email` varchar(100) NOT NULL,
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`username` varchar(100) NOT NULL,
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`password` varchar(100) NOT NULL,
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PRIMARY KEY (`id`)
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) ENGINE=InnoDB;
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CREATE TABLE `products` (
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`id` int(11) NOT NULL auto_increment,
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`name` varchar(100) NOT NULL,
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`qty` int(5) NOT NULL,
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`price` decimal(10,2) NOT NULL,
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`login_id` int(11) NOT NULL,
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PRIMARY KEY (`id`),
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CONSTRAINT FK_products_1
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FOREIGN KEY (login_id) REFERENCES login(id)
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ON UPDATE CASCADE ON DELETE CASCADE
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) ENGINE=InnoDB;

‎delete.php‎

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<?php session_start(); ?>
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<?php
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if(!isset($_SESSION['valid'])) {
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header('Location: login.php');
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}
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?>
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<?php
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//including the database connection file
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include("connection.php");
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//getting id of the data from url
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$id = $_GET['id'];
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//deleting the row from table
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$result=mysql_query("DELETE FROM products WHERE id=$id");
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//redirecting to the display page (view.php in our case)
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header("Location:view.php");
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?>
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‎edit.php‎

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<?php session_start(); ?>
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<?php
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if(!isset($_SESSION['valid'])) {
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header('Location: login.php');
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}
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?>
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<?php
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// including the database connection file
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include_once("connection.php");
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if(isset($_POST['update']))
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{
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$id = $_POST['id'];
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$name = $_POST['name'];
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$qty = $_POST['qty'];
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$price = $_POST['price'];
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// checking empty fields
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if(empty($name) || empty($qty) || empty($price)) {
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if(empty($name)) {
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echo "<font color='red'>Name field is empty.</font><br/>";
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}
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if(empty($qty)) {
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echo "<font color='red'>Quantity field is empty.</font><br/>";
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}
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if(empty($price)) {
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echo "<font color='red'>Price field is empty.</font><br/>";
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}
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} else {
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//updating the table
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$result = mysql_query("UPDATE products SET name='$name', qty='$qty', price='$price' WHERE id=$id");
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//redirectig to the display page. In our case, it is view.php
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header("Location: view.php");
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}
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}
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?>
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<?php
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//getting id from url
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$id = $_GET['id'];
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//selecting data associated with this particular id
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$result = mysql_query("SELECT * FROM products WHERE id=$id");
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while($res = mysql_fetch_array($result))
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{
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$name = $res['name'];
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$qty = $res['qty'];
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$price = $res['price'];
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}
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?>
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<html>
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<head>
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<title>Edit Data</title>
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</head>
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<body>
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<a href="index.php">Home</a> | <a href="view.php">View Products</a> | <a href="logout.php">Logout</a>
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<br/><br/>
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<form name="form1" method="post" action="edit.php">
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<table border="0">
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<tr>
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<td>Name</td>
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<td><input type="text" name="name" value=<?php echo $name;?>></td>
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</tr>
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<tr>
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<td>Quantity</td>
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<td><input type="text" name="qty" value=<?php echo $qty;?>></td>
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</tr>
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<tr>
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<td>Price</td>
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<td><input type="text" name="price" value=<?php echo $price;?>></td>
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</tr>
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<tr>
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<td><input type="hidden" name="id" value=<?php echo $_GET['id'];?>></td>
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<td><input type="submit" name="update" value="Update"></td>
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</tr>
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</table>
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</form>
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</body>
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</html>

‎index.php‎

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<?php session_start(); ?>
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<html>
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<head>
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<title>Homepage</title>
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<link href="style.css" rel="stylesheet" type="text/css">
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</head>
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<body>
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<div id="header">
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Welcome to my page!
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</div>
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<?php
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if(isset($_SESSION['valid'])) {
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include("connection.php");
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$result = mysql_query("SELECT * FROM login", $conn);
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?>
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Welcome <?php echo $_SESSION['name'] ?> ! <a href='logout.php'>Logout</a><br/>
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<br/>
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<a href='view.php'>View and Add Products</a>
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<br/><br/>
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<?php
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} else {
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echo "You must be logged in to view this page.<br/><br/>";
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echo "<a href='login.php'>Login</a> | <a href='register.php'>Register</a>";
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}
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?>
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<div id="footer">
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Created by <a href="http://blog.chapagain.com.np" title="Mukesh Chapagain">Mukesh Chapagain</a>
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</div>
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</body>
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</html>

‎login.php‎

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<?php session_start(); ?>
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<html>
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<head>
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<title>Login</title>
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</head>
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<body>
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<a href="index.php">Home</a> <br />
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<?php
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include("connection.php");
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if(isset($_POST['submit'])) {
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$user = mysql_real_escape_string($_POST['username']);
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$pass = mysql_real_escape_string($_POST['password']);
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if($user == "" || $pass == "") {
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echo "Either username or password field is empty.";
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echo "<br/>";
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echo "<a href='login.php'>Go back</a>";
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} else {
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$result = mysql_query("SELECT * FROM login WHERE username='$user' AND password=md5('$pass')",$conn)
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or die("Could not execute the select query.");
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$row = mysql_fetch_assoc($result);
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if(is_array($row) && !empty($row)) {
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$validuser = $row['username'];
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$_SESSION['valid'] = $validuser;
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$_SESSION['name'] = $row['name'];
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$_SESSION['id'] = $row['id'];
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} else {
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echo "Invalid username or password.";
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echo "<br/>";
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echo "<a href='login.php'>Go back</a>";
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}
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if(isset($_SESSION['valid'])) {
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header('Location: index.php');
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}
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}
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} else {
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?>
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<p><font size="+2">Login</font></p>
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<form name="form1" method="post" action="">
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<table width="75%" border="0">
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<tr>
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<td width="10%">Username</td>
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<td><input type="text" name="username"></td>
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</tr>
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<tr>
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<td>Password</td>
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<td><input type="password" name="password"></td>
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</tr>
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<tr>
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<td>&nbsp;</td>
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<td><input type="submit" name="submit" value="Submit"></td>
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</tr>
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</table>
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</form>
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<?php
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}
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?>
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</body>
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</html>

‎logout.php‎

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<?php
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session_start();
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session_destroy();
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header("Location:index.php");
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?>

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