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Oops! - PHP

One of the most compelling things PHP has going for it is it support for a wide variety of databases. And this week, PHP 101 is going to take advantage of that database support to create dynamic data-driven Web sites. This primer covers different techniques to select, insert and delete records, together with some tips to track and squash bugs when building SQL-driven sites.

  1. PHP 101 (part 4) - Look, Ma...It's Alive!
  2. Dumped!
  3. Hello Database!
  4. Different Strokes...
  5. ...For Different Folks
  6. What's In A Name?
  7. New Friends
  8. Today's Special
  9. Nuking The People
  10. Oops!
By: Vikram Vaswani and Harish Kamath, (c) Melonfire
Rating: starstarstarstarstar / 4
September 01, 2000

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All done? Nope, not quite yet - before you go out there and start building cool data-driven Web sites for your customers, you should be aware that PHP comes with some powerful error-tracking functions which can speed up development time. Take a look at the following example, which contains a deliberate error in the SELECT query string:

<?php // connect $connection = mysql_connect("localhost", "test", "test") or die("Invalid server or user"); mysql_select_db("php101",$connection) or die("Invalid database"); // query $query = "select from url_list"; // result $result = mysql_query($query,$connection); if(!$result) { $error_number = mysql_errno(); $error_msg = mysql_error(); echo "MySQL error $error_number: $error_msg"; } ?>
And here's the output:

MySQL error 1064: You have an error in your SQL syntax near 'from url_list' at line 1
The mysql_errno() function displays the error code returned by mySQL if there's an error in your SQL statement, while the mysql_error() function returns the actual error message. Turn these both on, and you'll find that they can significantly reduce the time you spend fixing bugs.

And that's about all we have for this issue of PHP 101. Next week, we'll be wrapping things up with a look at PHP's file read/write capabilities, and we'll also show you how to define your own PHP functions. Don't miss it!

>>> More PHP Articles          >>> More By Vikram Vaswani and Harish Kamath, (c) Melonfire

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