Php tutorial_ an introduction to pdo – learncomputer
Since its inception, PHP has moved from a procedural language to an object-oriented one; some of its procedural roots, however, still linger. Php objects and classes One of these procedural remnants is an antique method of accessing SQL databases; many programmers still use the older mysql and postgresql procedural modules to access databases, and even those who have switched to newer methods, like mysqli, might still be hampered by the fact that such a module only works with mysqli. Php coaching classes in pune PHP has since implemented better methods, but many procedural PHP developers are unsure of how to use newer, object-oriented MySQL connection methods.
Php classes in mumbai Let’s delve into one of them, PDO, to see how it works! Why Use PDO?
This one could be a book in and of itself, but the short answer is this: Many PHP programmers are still using legacy mysql or mysqli connections; PDO (which stands for “PHP Data Object”) was designed to offer an object-oriented, database-generic way of accessing and manipulating databases. How to use class in php w3schools It offers the best of both worlds; it’s object-oriented, unlike the procedural mysql module, and it’s database-agnostic, unlike the mysqli module, making it a great solution for a PHP program that interfaces with databases, MySQL or otherwise. Php functions and classes Step 1: Make sure your PHP install supports PDO
This can be found out by running a phpinfo page. Php programming classes online If you see “pdo_mysql” on the page, then you’re good to go; most installations above PHP 5.3 will have it enabled by default. Online php classes free If not, follow these steps: Windows
For previous PHP/MySQL users, that looks quite a bit different, but in fact it’s not all that hard to follow; those programmers used to procedural languages, however, might be a little lost. Php online classes for free What’s happening here is instead of connecting using mysql_connect, as you might be used to, you are instead creating an object (properly called a database handle object)whose functions you will call to perform queries on the database. Php classes mumbai It’s an object-oriented interface through which you’ll manipulate the database.
By the way, PDO is in fact database-agnostic. Php online training hyderabad It has many different drivers for different databases, including PostgreSQL, Firebird, Oracle, ODBC, SQLite, and more. Php classes in hyderabad ameerpet All you have to do to migrate to a different database is change the database driver type, like so:
You’ll notice now that it’s using Microsoft SQL! Very easy, and far more interchangeable than mysql or mysqli. Classes php 5 Connecting to SQLite databases is a little different, since SQLite databases are actually local files stored on the machine. Php extending classes To connect to one of those, use this line:
This interchangeability makes PDO enormously useful when writing a PHP program that needs to be able to interface with different databases, and not just MySQL. Classes and objects php All you have to do is change the database type in your original connect call and you’re set! Step 3: Communicating with the database: exec and query
A connection with the database is all well and good, but it’s not going to be much use to us if we can’t manipulate it at all. Php useful classes PDO’s method of handling queries in SQL is to have two functions: PDO::exec and PDO::query; PDO::exec is used for running queries that do not return information (like INSERT or UPDATE queries, for example) while PDO::query is used for queries that return information (like SELECT).
As you can see, the method for fetching the rows from a query is a little different from the procedural MySQL. Php classes repository Instead of all that business with mysql_get_results, the method is implemented in a nice little for loop.
So what’s the difference between these two? Well, PDO::exec doesn’t return results; it’s simply used to run queries that affect rows and don’t require output returned to them. Array of classes php PDO::query can technically be used in place of PDO::exec for running queries that just affect rows, but PDO::exec is much faster and useful for that purpose. What are php classes Step 4: PDO::quote
Some more zealous coders among you might notice that the queries above are quite vulnerable to SQL injection and other malicious strings. Php classes in baroda PDO offers a function to help with that as well called PDO::quote. Learn php classes and objects PDO::quote works by quoting the input string and escapes while putting single quotes within the input string, stopping your SQL server from happily running queries it wasn’t designed to:
The above tutorial has shown you a little bit of PDO, how to use it, and why it’s attractive to developers. Classes for php in mumbai It is, of course, far deeper than the very basic introduction tutorial given above: PDO has prepared statements, fetching abilities, transactional capabilities, and more. Using classes in php Those are outside the scope of this article (though not outside the scope of a future article, potentially). Php classes in nagpur The point of this article was more to introduce PDO to programmers who have been using the mysql or mysqli modules, and give them an idea of why they might want to switch over to PDO! Help us spread the word!
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