Download E-books Learning PHP Data Objects: A Beginner's Guide to PHP Data Objects, Database Connection Abstraction Library for PHP 5 PDF

By Dennis Popel

This publication begins with an summary of personal home page information gadgets (PDO), by means of getting begun with PDO. Then it covers blunders dealing with, ready statements, and dealing with rowsets, prior to protecting complicated makes use of of PDO and an instance of its use in an MVC software. eventually an appendix covers the hot object-oriented gains of personal home page five. This ebook will consultant you thru the information layer abstraction gadgets in personal home page. Hypertext Preprocessor builders who have to use PDO for facts abstraction.

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Identification ORDER by way of title"); $books = $q->fetchAll(PDO::FETCH_COLUMN, 5); var_dump($books); this may supply the next output: array(3) { [0]=> string(28) "Building web pages with Plone" [1]=> string(66) "Creating your MySQL Database: functional layout information and strategies" [2]=> string(18) "ImageMagick methods" } As you'll discover, whilst a unmarried column is asked, this system returns one-dimensional array. Retrieving outcome Set Metadata As we've seen within the past part, the PDOStatement classification permits us to retrieve a few information regarding the knowledge inside the consequence set. this data is named metadata, and also you most likely have already used a few of it a technique or one other. an important metadata a few consequence set is, in fact, the variety of rows it includes. we will use the row count number to augment consumer adventure through, for instance, paginating lengthy outcome units. Our instance library software remains to be rather small, with in simple terms 3 books to this point, yet as our database grows, we without doubt will want a few instruments to get the entire row count number for each desk displayed and paginate it for simple looking. routinely, you'll use the mysql_num_rows(), sqlite_num_rows() functionality or the pg_num_rows() functionality (depending in your database) to get the full variety of rows lower back via the question. In PDO, the tactic answerable for retrieving the variety of rows is termed PDOStatement::rowCount(). even though, for you to attempt it with the next code: $q = $conn->query("SELECT * FROM books ORDER through title"); $q->setFetchMode(PDO::FETCH_ASSOC); var_dump($q->rowCount()); you will find PDO returns zero either for MySQL and SQLite. for the reason that PDO operates another way from the conventional database extensions. The documentation says, "If the final SQL assertion completed by way of the linked PDOStatement classification was once a pick out assertion, a few databases may well go back the variety of rows back by way of that assertion. even if, this habit isn't really assured for all databases and shouldn't be depended on for moveable functions. " Neither MySQL nor SQLite drivers aid this performance, and that is why the go back price of this system is zero. we are going to see tips to count number the variety of rows back with PDO (so that it is a fairly moveable approach) in bankruptcy five. A RDBMS doesn't know the way many rows a question will go back until eventually the final row has been retrieved. this is often performed due to functionality issues. normally, queries with a the place clause, go back purely a part of the rows kept in a desk, and database servers do their most sensible to make sure that such queries execute as quick as attainable. which means they begin returning rows once they realize those who fit the the place clause—this occurs a lot ahead of while the final row is reached. because of this they truly have no idea what percentage rows may be lower back previously. The mysql_num_rows(), sqlite_num_rows() functionality or the pg_num_rows() functionality operates on end result units which were prefetched into reminiscence (buffered queries). PDO's default habit is to take advantage of unbuffered queries.

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