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A simple PHP Class for using with MySQL create, read, update and delete functions. Using OOP this class can easily be added to to enhance existing functions or create more.

Using The Class

Database Credentials

You will need to change some variable values in the Class, that represent those of your own database. Change the following -

private $db_host = "localhost";  // Change as required
private $db_user = "username";  // Change as required
private $db_pass = "password";  // Change as required
private $db_name = "database";	// Change as required

Test MySQL

Start by creating a test table in your database -

CREATE TABLE IF NOT EXISTS CRUDClass (
  id int(11) NOT NULL AUTO_INCREMENT,
  name varchar(255) NOT NULL,
  email varchar(255) NOT NULL,
  PRIMARY KEY (id)
);

INSERT INTO CRUDClass VALUES('','Name 1','name1@email.com');
INSERT INTO CRUDClass VALUES('','Name 2','name2@email.com');
INSERT INTO CRUDClass VALUES('','Name 3','name3@email.com');

Select Example

Use the following code to select * rows from the databse using this class

<?php
include('class/mysql_crud.php');
$db = new Database();
$db->connect();
$db->select('CRUDClass'); // Table name
$res = $db->getResult();
print_r($res);

Use the following code to specify what is selected from the database using this class

<?php
include('class/mysql_crud.php');
$db = new Database();
$db->connect();
$db->select('CRUDClass','id,name',null,'name="Name 1"','id DESC'); // Table name, Column Names, WHERE conditions, ORDER BY conditions
$res = $db->getResult();
print_r($res);

Join Example

Start by creating another table in your database -

CREATE TABLE IF NOT EXISTS CRUDClassChild (
  id int(11) NOT NULL AUTO_INCREMENT,
  parentId int(11) NOT NULL,
  name varchar(255) NOT NULL,
  PRIMARY KEY (id)
);

INSERT INTO CRUDClassChild VALUES('','1','Child 1');
INSERT INTO CRUDClassChild VALUES('','1','Child 2');
INSERT INTO CRUDClassChild VALUES('','2','Child 1');

Use the following code to select rows using a join in the database using this class

<?php
include('class/mysql_crud.php');
$db = new Database();
$db->connect();
$db->select('CRUDClass','CRUDClass.id,CRUDClass.name,CRUDClassChild.name','CRUDClassChild ON CRUDClass.id = parentId','CRUDClass.name="Name 1"','id DESC'); // Table name, Column Names, JOIN, WHERE conditions, ORDER BY conditions
$res = $db->getResult();
print_r($res);

Update Example

Use the following code to update rows in the database using this class

<?php
include('class/mysql_crud.php');
$db = new Database();
$db->connect();
$db->update('CRUDClass',array('name'=>"Name 4",'email'=>"name4@email.com"),'id="1" AND name="Name 1"'); // Table name, column names and values, WHERE conditions
$res = $db->getResult();
print_r($res);

Insert Example

Use the following code to insert rows into the database using this class

<?php
include('class/mysql_crud.php');
$db = new Database();
$db->connect();
$db->insert('CRUDClass',array('name'=>'Name 5','email'=>'name5@email.com'));  // Table name, column names and respective values
$res = $db->getResult();  
print_r($res);

Delete Example

Use the following code to delete rows from the database with this class

<?php
include('class/mysql_crud.php');
$db = new Database();
$db->connect();
$db->delete('CRUDClass','id=5');  // Table name, WHERE conditions
$res = $db->getResult();  
print_r($res);

Full SQL Example

Use the following code to enter the full SQL query

<?php
include('class/mysql_crud.php');
$db = new Database();
$db->connect();
$db->sql('SELECT id,name FROM CRUDClass');
$res = $db->getResult();
foreach($res as $output){
	echo $output["name"]."<br />";
}

jQuery and AJAX Example

Use the following code to select names from the database with this class using jQuery and AJAX

<!DOCTYPE html>
<!--[if lt IE 7]>      <html class="no-js lt-ie9 lt-ie8 lt-ie7"> <![endif]-->
<!--[if IE 7]>         <html class="no-js lt-ie9 lt-ie8"> <![endif]-->
<!--[if IE 8]>         <html class="no-js lt-ie9"> <![endif]-->
<!--[if gt IE 8]><!--> <html class="no-js"> <!--<![endif]-->
    <head>
        <meta charset="utf-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
        <title></title>
        <meta name="description" content="">
        <meta name="viewport" content="width=device-width">
        <script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
        <script>
        	$(function(){
        		$.ajax({
        			url:"ajax/select.php",
        			dataType:"json",
        			success:function(data){
        				$.each(data, function(index){
        					$("#names").append("<li>"+data[index].name+"</li>")
        				});
        			}
        		});
        	});
        </script>
    </head>
    <body>
        <!--[if lt IE 7]>
            <p class="chromeframe">You are using an <strong>outdated</strong> browser. Please <a href="http://browsehappy.com/">upgrade your browser</a> or <a href="http://www.google.com/chromeframe/?redirect=true">activate Google Chrome Frame</a> to improve your experience.</p>
        <![endif]-->
        <ul id="names"></ul>
    </body>
</html>
<?php
header('content-type: application/json; charset=utf-8');
include('../class/mysql_crud.php');
$db = new Database();
$db->connect();
$db->select('CRUDClass','name'); // Table name, Column Name
$res = $db->getResult();
echo json_encode($res);