The course teaches PHP Data Objects (PDO), the preferred way to connect to databases within PHP. It covers connecting to the database, and using all the features required to build fast, scalable applications that use a database connection. It covers essential concepts like security, and best practices with using the data retrieved from the database.
While a basic knowledge of PHP is recommended for this course, both beginners and experienced web developers will gain a complete understanding of how PHP Data Objects work.
A basic knowledge of PHP is recommended for this course. You will need to be able to open and write to a basic PHP file and be able to have a server and database installed. This course will use MySQL server.
Exactly What Is PDO?
The PHP Data Objects (PDO) extension defines a lightweight, consistent interface for accessing databases in PHP. Each database driver that implements the PDO interface can expose database-specific features as regular extension functions. Note that you cannot perform any database functions using the PDO extension by itself; you must use a database-specific PDO driver to access a database server.
PDO provides a data-access abstraction layer, which means that, regardless of which database you're using, you use the same functions to issue queries and fetch data. PDO does not provide a database abstraction; it doesn't rewrite SQL or emulate missing features. You should use a full-blown abstraction layer if you need that facility.
Explains how to list the available database drivers installed on the system that can be used with PDO
Setting up an example database, explaining each column and inserting some example records that we can use throughout the series.
Using PHP to connect to the database and checking what we can do if a connection fails
Setting error levels for PDO, so we can check for errors in different ways.
Sending a basic query to the database server.
Fetching a list of results from our database table, and examining the data we receive
Looping over results so we can display them in a list or modify them. We use some HTML to display results to a user on a page.
Showing an easier way to fetch all results using one method so we don't need to loop over each row
Fetching results as an object, so we can work with data in true object oriented style and make our application clean and the data easier to work with.
Getting the count of rows in the results so we can either display the amount of results we have, or use this number for later calculations.
A small side project, creating a PHP class to represent a user in the system, which allows us to implement methods (functions) for each user we get back. This keeps our application DRY (do not repeat yourself) and much easier to work with, saving time in the future.
A look at security, and escaping data before we use it in our database queries, to help prevent against SQL injection.
Prepared statements that help query with large amounts of user data and more importantly automatically protect against SQL injection without having to manually escape each peice of data.
Inserting new records into the database.
Getting the last inserted ID of the record so we can perform future queries using the last record as a reference.
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