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Php talk

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Php talk

  1. 1. PHP
  2. 2. What is PHP  What is PHP?  PHP is an acronym for "PHP Hypertext Preprocessor"  PHP is a widely-used, open source scripting language  PHP scripts are executed on the server  PHP costs nothing, it is free to download and use  Note PHP is an amazing and popular language!  It is powerful enough to be at the core of the biggest blogging system on the web (WordPress)!  It is deep enough to run the largest social network (Facebook)!  It is also easy enough to be a beginner's first server side language!  text, such as XHTML and XML.
  3. 3. What is a PHP File?  PHP files can contain text, HTML, CSS, JavaScript, and PHP code  PHP code are executed on the server, and the result is returned to the browser as plain HTML  PHP files have extension ".php"  What Can PHP Do?  PHP can generate dynamic page content  PHP can create, open, read, write, delete, and close files on the server  PHP can collect form data  PHP can send and receive cookies  PHP can add, delete, modify data in your database  PHP can restrict users to access some pages on your website  PHP can encrypt data  With PHP you are not limited to output HTML. You can output images, PDF files, and even Flash movies. You can also output any
  4. 4. Why PHP?  PHP runs on various platforms (Windows, Linux, Unix, Mac OS X, etc.)  PHP is compatible with almost all servers used today (Apache, IIS, etc.)  PHP supports a wide range of databases  PHP is free. Download it from the official PHP resource: www.php.net  PHP is easy to learn and runs efficiently on the server side
  5. 5. Connecting to Database  Database Driver  PDO (PHP Data Objects) is a database driver the will work on 12 different database systems. It comes pre-installed with php5 <?php $servername = "localhost"; $username = "username"; $password = "password"; try { $conn = new PDO("mysql:host=$servername;dbname=myDB", $username, $password); echo "Connected successfully"; } catch(PDOException $e) { echo $e->getMessage(); } ?>
  6. 6. Creating a Database <?php $servername = "localhost"; $username = "root"; $password = "root”; try { $conn = new PDO("mysql:host=$servername;dbname=COSC531", $username, $password); // set the PDO error mode to exception $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); $sql = "CREATE DATABASE myDBPDO"; // use exec() because no results are returned $conn->exec($sql); echo "Database created successfully"; } catch(PDOException $e) { echo $sql . "<br>" . $e->getMessage();
  7. 7. Creating a Table <?php $servername = "localhost"; $username = "root"; $password = "root"; $dbname = "myDBPDO"; try { $conn = new PDO("mysql:host=$servername;dbname=myDBPDO", $username, $password); // set the PDO error mode to exception $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); // sql to create table $sql = "CREATE TABLE MyGuests ( id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY, firstname VARCHAR(30) NOT NULL, lastname VARCHAR(30) NOT NULL,
  8. 8. Inserting into a Table <?php $servername = "localhost"; $username = "root"; $password = "root"; $dbname = "myDBPDO"; try { $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password); // set the PDO error mode to exception $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); $sql = "INSERT INTO MyGuests (firstname, lastname, email) VALUES ('John', 'Doe', 'john@example.com')"; // use exec() because no results are returned $conn->exec($sql); echo "New record created successfully"; }
  9. 9. Last Id inserted <?php $servername = "localhost"; $username = "root"; $password = "root"; $dbname = "myDBPDO"; try { $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password); // set the PDO error mode to exception $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); $sql = "INSERT INTO MyGuests (firstname, lastname, email) VALUES ('John', 'Doe', 'john@example.com')"; // use exec() because no results are returned $conn->exec($sql); $last_id = $conn->lastInsertId(); echo "New record created successfully. Last inserted ID is: " . $last_id;
  10. 10. Inserting Multiple Records <?php $servername = "localhost"; $username = "root"; $password = "root"; $dbname = "myDBPDO"; try { $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password); // set the PDO error mode to exception $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); // begin the transaction $conn->beginTransaction(); // our SQL statememtns $conn->exec("INSERT INTO MyGuests (firstname, lastname, email) VALUES ('John', 'Doe', 'john@example.com')");
  11. 11. Select <?php $servername = "localhost"; $username = "root"; $password = "root"; $dbname = "myDBPDO"; // Create connection $conn = new mysqli($servername, $username, $password, $dbname); // Check connection if ($conn->connect_error) { die("Connection failed: " . $conn->connect_error); } $sql = "SELECT id, firstname, lastname FROM MyGuests"; $result = $conn->query($sql);
  12. 12. Delete from Table <?php $servername = "localhost"; $username = "root"; $password = "root"; $dbname = "myDBPDO"; try { $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password); // set the PDO error mode to exception $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); // sql to delete a record $sql = "DELETE FROM MyGuests WHERE id=3"; // use exec() because no results are returned $conn->exec($sql);
  13. 13. Delete from Table <?php $servername = "localhost"; $username = "root"; $password = "root"; $dbname = "myDBPDO"; try { $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password); // set the PDO error mode to exception $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); $sql = "UPDATE MyGuests SET lastname='Doey' WHERE id=2"; // Prepare statement $stmt = $conn->prepare($sql);
  14. 14. Do I actually use this?  NO!  I use framworks that encapsilate the DB operation  Drupal uses operations on nodes and entity to develop queries in the background  Symphony/Laravel user ORM(object relational mapping) to develop queries in the backgroud
  15. 15. If the framework does the work, Why do I need to know this  Without an understanding of the underlying architecture and techniques to manipulate that architechture

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