Learning PHP Data Objects: A Beginner's Guide to PHP Data Objects, Database Connection Abstraction Library for PHP 5

By Dennis Popel

This e-book starts off with an outline of personal home page information gadgets (PDO), by way of getting all started with PDO. Then it covers blunders dealing with, ready statements, and dealing with rowsets, earlier than masking complicated makes use of of PDO and an instance of its use in an MVC program. eventually an appendix covers the hot object-oriented positive factors of Hypertext Preprocessor five. This ebook will consultant you thru the knowledge layer abstraction gadgets in Hypertext Preprocessor. personal home page builders who have to use PDO for facts abstraction.

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Although, there's one driver-specific characteristic worthy our cognizance: PDO::ATTR_PERSISTENT. you should use it to specify that the MySQL driving force may still use chronic connections, which supplies higher functionality (You can give some thought to this as a counterpart for mysql_pconnect() functionality. ) This characteristic will be set within the PDO instead of through a PDO::setAttribute() name: $conn = new PDO($connStr, $user, $pass, array(PDO::ATTR_PERSISTENT => true); The above 3 attributes are read/write attributes, because of this they are often learn and written. There also are read-only attributes, on hand merely through the PDO::getAttribute() procedure. those attributes may perhaps go back string values (rather than constants outlined within the PDO class). PDO::ATTR_DRIVER_NAME: This returns the identify of the underlying database driver:echo $conn->getAttribute(PDO::ATTR_DRIVER_NAME); this can print both MySQL or SQLite reckoning on the motive force you employ. PDO::ATTR_CLIENT_VERSION: This returns the identify of the underlying database patron library model. for instance, for MySQL this can be whatever like five. zero. 37. PDO::ATTR_SERVER_VERSION: This returns the model of the database server you're connecting to. For MySQL, it is a string such as"4. 1. 8-nt". Let's now come again to our program and alter it to teach the database driving force within the footer of each web page. to accomplish this, we'll adjust the showFooter() functionality in universal. inc. Hypertext Preprocessor: functionality showFooter() { worldwide $conn; if($conn instanceof PDO) { $driverName = $conn->getAttribute(PDO::ATTR_DRIVER_NAME); echo "

"; echo "Connecting utilizing $driverName driver"; } ? >

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