CRUD<\/b> stands for Create, Read, Update and Delete. CRUD operations are commonly used to manipulate data in the database. Almost, all the dynamic web application uses Add, Edit, Update and Delete functionality for managing data with the database. In this tutorial, we will create a simple PHP CRUD application<\/b> with MySQL to perform create (insert), read (select), update, and delete operations.<\/p>\n
The MySQLi Extension<\/b> (MySQL Improved) and Object Oriented Programming (OOP) technique will be used to implement CRUD functionality in PHP. For the demonstration purpose, we will show you the CRUD operations to view, add, edit, and delete user data in PHP using MySQL.<\/p>\n
The following functionalities will be integrated into the example PHP CRUD application<\/b>.<\/p>\n Before getting started to create CRUD application with PHP<\/b> and MySQLi, take a look at the files structure.<\/p>\n To store the user\u2019s information a table needs to be created in the database. The following SQL creates a The DB class handles all the database related operations (connect, insert, update, and delete). Specify the database host (\n
php_crud_with_mysql\/<\/span>\r\n\u251c\u2500\u2500 index.php\r\n\u251c\u2500\u2500 addEdit.php\r\n\u251c\u2500\u2500 userAction.php\r\n\u251c\u2500\u2500 DB.class.php\r\n\u251c\u2500\u2500 bootstrap\/<\/span>\r\n\u2502 \u2514\u2500\u2500 bootstrap.min.css\r\n\u251c\u2500\u2500 css\/<\/span>\r\n\u2502 \u2514\u2500\u2500 style.css\r\n\u2514\u2500\u2500 images\/<\/span>\r\n<\/pre>\nCreate Database Table<\/h2>\n
users<\/code> table with some basic fields in the MySQL database.<\/p>\nCREATE<\/span> TABLE<\/span> `users`<\/span> (\r\n `id`<\/span> int<\/span>(11<\/span>) NOT<\/span> NULL<\/span> AUTO_INCREMENT,\r\n `name`<\/span> varchar<\/span>(50<\/span>) COLLATE<\/span> utf8_unicode_ci NOT<\/span> NULL<\/span>,\r\n `email`<\/span> varchar<\/span>(50<\/span>) COLLATE<\/span> utf8_unicode_ci NOT<\/span> NULL<\/span>,\r\n `phone`<\/span> varchar<\/span>(20<\/span>) COLLATE<\/span> utf8_unicode_ci NOT<\/span> NULL<\/span>,\r\n `created`<\/span> datetime NOT<\/span> NULL<\/span>,\r\n `modified`<\/span> datetime NOT<\/span> NULL<\/span>,\r\n `status`<\/span> enum('1'<\/span>,'0'<\/span>) COLLATE<\/span> utf8_unicode_ci NOT<\/span> NULL<\/span> DEFAULT<\/span> '1'<\/span> COMMENT<\/span> '1=Active, 0=Inactive'<\/span>,\r\n PRIMARY KEY<\/span> (`id`<\/span>)\r\n) ENGINE<\/span>=InnoDB<\/span> DEFAULT<\/span> CHARSET<\/span>=utf8 COLLATE<\/span>=utf8_unicode_ci;<\/pre>\nDatabase Class (DB.class.php)<\/h2>\n
$dbHost<\/code>), username ($dbUsername<\/code>), password ($dbPassword<\/code>), and name ($dbName<\/code>) as per your MySQL database credentials.<\/p>\n\n
<?php
<\/span>\/*
* DB Class
* This class is used for database related (connect, insert, update, and delete) operations
* @author CodexWorld.com
* @url http:\/\/www.codexworld.com
* @license http:\/\/www.codexworld.com\/license
*\/
<\/span>class <\/span>DB<\/span>{
private <\/span>$dbHost <\/span>= <\/span>\"localhost\"<\/span>;
private <\/span>$dbUsername <\/span>= <\/span>\"root\"<\/span>;
private <\/span>$dbPassword <\/span>= <\/span>\"root\"<\/span>;
private <\/span>$dbName <\/span>= <\/span>\"codexworld\"<\/span>;
public function <\/span>__construct<\/span>(){
if(!isset(<\/span>$this<\/span>-><\/span>db<\/span>)){
<\/span>\/\/ Connect to the database
<\/span>$conn <\/span>= new <\/span>mysqli<\/span>(<\/span>$this<\/span>-><\/span>dbHost<\/span>, <\/span>$this<\/span>-><\/span>dbUsername<\/span>, <\/span>$this<\/span>-><\/span>dbPassword<\/span>, <\/span>$this<\/span>-><\/span>dbName<\/span>);
if(<\/span>$conn<\/span>-><\/span>connect_error<\/span>){
die(<\/span>\"Failed to connect with MySQL: \" <\/span>. <\/span>$conn<\/span>-><\/span>connect_error<\/span>);
}else{
<\/span>$this<\/span>-><\/span>db <\/span>= <\/span>$conn<\/span>;
}
}
}
<\/span>\/*
* Returns rows from the database based on the conditions
* @param string name of the table
* @param array select, where, order_by, limit and return_type conditions
*\/
<\/span>public function <\/span>getRows<\/span>(<\/span>$table<\/span>, <\/span>$conditions <\/span>= array()){
<\/span>$sql <\/span>= <\/span>'SELECT '<\/span>;
<\/span>$sql <\/span>.= <\/span>array_key_exists<\/span>(<\/span>\"select\"<\/span>,<\/span>$conditions<\/span>)?<\/span>$conditions<\/span>[<\/span>'select'<\/span>]:<\/span>'*'<\/span>;
<\/span>$sql <\/span>.= <\/span>' FROM '<\/span>.<\/span>$table<\/span>;
if(<\/span>array_key_exists<\/span>(<\/span>\"where\"<\/span>,<\/span>$conditions<\/span>)){
<\/span>$sql <\/span>.= <\/span>' WHERE '<\/span>;
<\/span>$i <\/span>= <\/span>0<\/span>;
foreach(<\/span>$conditions<\/span>[<\/span>'where'<\/span>] as <\/span>$key <\/span>=> <\/span>$value<\/span>){
<\/span>$pre <\/span>= (<\/span>$i <\/span>> <\/span>0<\/span>)?<\/span>' AND '<\/span>:<\/span>''<\/span>;
<\/span>$sql <\/span>.= <\/span>$pre<\/span>.<\/span>$key<\/span>.<\/span>\" = '\"<\/span>.<\/span>$value<\/span>.<\/span>\"'\"<\/span>;
<\/span>$i<\/span>++;
}
}
if(<\/span>array_key_exists<\/span>(<\/span>\"order_by\"<\/span>,<\/span>$conditions<\/span>)){
<\/span>$sql <\/span>.= <\/span>' ORDER BY '<\/span>.<\/span>$conditions<\/span>[<\/span>'order_by'<\/span>];
}else{
<\/span>$sql <\/span>.= <\/span>' ORDER BY id DESC '<\/span>;
}
if(<\/span>array_key_exists<\/span>(<\/span>\"start\"<\/span>,<\/span>$conditions<\/span>) && <\/span>array_key_exists<\/span>(<\/span>\"limit\"<\/span>,<\/span>$conditions<\/span>)){
<\/span>$sql <\/span>.= <\/span>