PHP Data Objects

Introduction
 PHP5 extension written in a compiled language (C/C++).
 Provides data-access abstraction layer.
 Lightweight, consistent interface.
 Play a major role between PHP servers and databases.
 Work as connectors between PHP site and its supporting
database.
 Supports any database PDO driver has been written for.

DataBase Supports
 CUBRID
 Firebird
 IBM
 Informix
 Oracle
 MySQL
 PostgreSQL
 Ms SQL Server
 SQLite
 ODBC & DB2

Another Way..
<?php
print_r(PDO::getAvailableDrivers());
Output:
Array ( [0] => mysql )

How to Connect
<?php
$handler = new PDO('mysql:host=localhost;dbname=pdotest', 'username','password');
Database Type HostName
DataBase Name
DB UserName
DB Password

Fetch Data
➔ Associative Array
➔ Numeric Array
➔ Std Class Object
➔ Custom Class object

Examples
Database Name - pdotest
Table Name - person

Fetch Array
<?php
$host = 'localhost';
$user = 'root';
$password = 'root';
$database = 'pdotest';
$handler = new PDO('mysql:host=' . $host . ';dbname=' . $database . '', $user,
$password);
$query = $handler->query('SELECT * FROM person');
echo '<pre>', print_r($query->fetch()), '</pre>';
Output:
Array
(
[id] => 2
[0] => 2
[firstName] => Prashant
[1] => Prashant
[lastName] => Marathe
[2] => Marathe
[message] => This is Test Message
[3] => This is Test Message
[timeCreated] => 2015-02-21 15:14:13
[4] => 2015-02-21 15:14:13
)

Fetch All Data
<?php
$query->setFetchMode(PDO::FETCH_ASSOC);
echo '<pre>', print_r($query->fetchAll()), '</pre>';
Array
(
[0] => Array
(
[id] => 2
[timeCreated] => 2015-02-21 15:14:13
)
[1] => Array
(
[id] => 3
[firstName] => Atul
[lastName] => Joshi
[timeCreated] => 2015-02-21 15:16:02
)
Here you can also set
the fetching mode

Fetch Object
<?php
$query->setFetchMode(PDO::FETCH_OBJ);
Output:
stdClass Object
(
[id] => 2
[timeCreated] => 2015-02-21 15:14:13
)
This returns an object of stdclass

Fetch Data In Class
<?php
class person {
public $id, $firstName, $lastName, $message, $timeCreated, $newProperty;
public function __construct() {
$this->newProperty = 'This is new property';
}
}
$query->setFetchMode(PDO::FETCH_CLASS, 'person');
Output:
person Object
(
[id] => 2
[timeCreated] => 2015-02-21 15:14:13
[newProperty] => This is new property
)

Prepared Statements
➢ Precompiled SQL statements that can be
executed multiple times by sending just data to
the server
➢ Prepared statements will help us to protect from
SQL injection

Use Placeholders
<?php
$firstName = "Test";$lastName = "User";$message = "This is test message";
$timeCreated = date('Y-m-d H:i:s');
// Prepare statement to make a execution
$query = $handler->prepare('INSERT INTO person (firstName, lastName, message,
timeCreated) values(?, ?, ?, ?)');
// Bind the params
$query->bindParam(1, $firstName);
$query->bindParam(2, $lastName);
$query->bindParam(3, $message);
$query->bindParam(4, $timeCreated);
$query->execute();
Unnamed Placeholders

Named Placeholders
<?php
// Prepare statement to make a execution
$query = $handler->prepare('INSERT INTO person (firstName, lastName, message,
timeCreated) values(:firstName, :lastName, :message, :timeCreated)');
// Bind the params
$query->bindParam(':firstName', $firstName);
$query->bindParam(':lastName', $lastName);
$query->bindParam(':message', $message);
$query->bindParam(':timeCreated', $timeCreated);
$firstName = "Test";$lastName = "User";$message = "This is test message";
$timeCreated = date('Y-m-d H:i:s');
$query->execute();

Where it is in TYPO3Flow ?
Settings.yaml Directory Structure

The points which we covered
➢ What is PDO ?
➢ Supported databases.
➢ How to identify available or installed PDO
driver's ?
➢ How to connect with PDO ?
➢ How to fetch the data?
➢ Prepared Statements
➢ How it is used in TYPO3 Flow?

Advantages
✔ Support great number of database systems
supported by PHP
✔ Better Security
✔ Improved performance
✔ Enhanced reliability

Disadvantages
✗ PDO only offers Object Oriented API

PHP Data Objects

More Related Content

What's hot (18)

Similar to PHP Data Objects (20)

Recently uploaded (20)

PHP Data Objects