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Different Strokes... - 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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What you just saw was a very basic example. Our next example will query the database, return the list of users with their URL list, and display it all in a neat

<html> <head> </head> <body> <?php // set up some variables // server name $server = "localhost"; // username $user = "test"; // password $pass = "test"; // database to query $db = "php101"; // open a connection to the database $connection = mysql_connect($server, $user, $pass) or die("Invalid server or user"); // formulate the SQL query $query = "select * from url_list" or die("Error in query"); // run the query on the database $result = mysql_db_query($db, $query, $connection) or die("Error in query"); // display the result echo "<table width=450 border=1 cellspacing=0 cellpadding=0>"; echo "<tr><td width=150 align=left>User</td><td width=100 align=left>Site #1</td><td width=100 align=left>Site #2</td><td width=100 align=left>Site #3</td></tr>"; // with a while loop // this loop will iterate as many times as there are records while($myrow = mysql_fetch_array($result)) { $user = $myrow["uid"]; $title1 = $myrow["title1"]; $url1 = $myrow["url1"]; $title2 = $myrow["title2"]; $url2 = $myrow["url2"]; $title3 = $myrow["title3"]; $url3 = $myrow["url3"]; echo "<tr><td width=150 align=left>$user</td><td width=100 align=left><a href=$url1>$title1</a></td><td width=100 align=left><a href=$url2>$title2</a></td><td width=100 align=left><a href=$url3>$title3</a></td></tr>"; } // memory flush mysql_free_result($result); ?> </body> </html>
As in our previous example, the script first sets up a connection to the database. The query is formulated and the result set is returned to the browser. In this case, since there's going to be much more data than before, it's a good idea to use the mysql_fetch_array() function - this function returns the values from the database as an enumerated array, allowing you to access each element by the column name

$user = $myrow["uid"]; $title1 = $myrow["title1"]; $url1 = $myrow["url1"];
and so on. Note our use of a "while" loop to parse and display each available record of the result set, and of the die() function to exit the script with an error message should there be an error in the configuration information or the query string. And here's the output:

<html> <head> </head> <body> <table width=450 border=1 cellspacing=0 cellpadding=0> <tr><td width=150 align=left>User</td><td width=100 align=left>Site #1</td><td width=100 align=left>Site #2</td><td width=100 align=left>Site #3</td></tr> <tr><td width=150 align=left>john</td><td width=100 align=left><a href=http://www.melonfire.com>Melonfire</a></td><td width=100 align=left><a href=http://www.devshed.com>Devshed</a></td><td width=100 align=left><a href=http://www.php.net>PHP.Net</a></td></tr> <tr><td width=150 align=left>bill</td><td width=100 align=left><a href=http://www.yahoo.com>Yahoo</a></td><td width=100 align=left><a href=http://www.slashdot.org>Slashdot</a></td><td width=100 align=left><a href=http://www.32bit.com>32Bit.com</a></td></tr> </table> </body> </html>

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

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