Join David Powers for an in-depth discussion in this video Getting the required data, part of Code Clinic: PHP.
…The web service needs to connect to the database, only if the…series of checks that we've just created hasn't generated an error message.…So at the bottom of the script in podata.php,…add a conditional statement that's checking for no error.…So let's just scroll down a bit.…And we're going down, add that conditional statement, if no error.…The error variable was initialized to null, right…at the beginning of the script, so it will…only equate to true if an error has been added to it by this series of checks here.…
If there are no errors, we can connect to the database.…We'll use PDO, so we need a try, catch block.…And inside the catch block, we need to catch any messages…from the exception but we want to keep those to ourself.…We'll have a separate one that is more…generalized, which will go for the web service.…So, exception and, then a more general one.…This is for our web service, so it's as an array.…And now inside the try block, we can connect to the database.…Store the database connection as DB.…
It'll be a new PDO.…
David introduces challenges and provides an overview of his solutions in PHP. Challenges include topics such as statistical analysis, searching directories for images, and accessing peripheral devices.
Visit other courses in the series to see how to solve the exact same challenges in languages like C#, C++, Java, Python, and Ruby.
Skill Level Intermediate
Q: I'm encountering script errors message with the prime_dates.php file used in the "Priming the date_record column" movie in this course. How can I resolve these errors?
A: To avoid script errors, use bindValue() instead of bindParam() in
Line 9 of the prime_dates.php file. You can also download the latest
copy of the exercise files, which corrects this issue for you. For a
more in-depth explanation of the difference between bindValue() and
bindParam(), check out the "Binding input and output values" video (http://www.lynda.com/PHP-
Q: Why can't I access the Lake Pend Orielle site (http://lpo.dt.navy.mil)?
A: The Lake Pend Orielle site is not accessible in some geographical areas. We have contacted the owner of the server to try to resolve this issue.
Q: I am unable to access the Lake Pend Oreille data from outside the U.S.
A: A static copy of this data is provided here for lynda.com members outside of the U.S
Problem One: Statistical Analysis
Problem Two: Image Analysis
Problem Three: Eight Queens
Problem Four: Accessing Peripherals
Problem Five: Recursion and Directories
Problem Six: Building the Web
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