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MySQL & PHP Manual - Build your own database driven web site!
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Finally, a practical, down-to-earth guide to learning PHP & MySQL!
We hope you enjoy this sample chapter from "Build Your Own Database Driven Website Using PHP & MySQL" This book is only available from the SitePoint Website for US$34.95. It also comes with electronic access to all PHP and MySQL code samples used throughout the book.
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We now have the code that will allow a user to type a joke and add it to our database. All that remains is to slot it into our existing joke viewing page in a useful fashion. Since most users will only want to view our jokes, we don't want to mar our page with a big, ugly form unless the user expresses an interest in adding a new joke. For this reason, our application is well suited for implementation as a multi-purpose page. Here's the code (available as jokes.php in the http://sitepoint.com/books/?bookid=MoreBooks code archive):
<html>
<head>
<title> The Internet Joke Database </title>
</head>
<body>
<?php
if (isset($addjoke)): // If the user wants to add a joke
?>
<form action="<?=$PHP_SELF?>" method="post">
<p>Type your joke here:<br />
<textarea name="joketext" rows="10" cols="40" wrap></textarea><br />
<input type="submit" name="submitjoke" value="SUBMIT" /></p>
</form>
<?php
else: // Default page display
// Connect to the database server
$dbcnx = @mysql_connect("localhost", "root", "mypasswd");
if (!$dbcnx) {
echo( "<p>Unable to connect to the " .
"database server at this time.</p>" );
exit();
}
// Select the jokes database
if (! @mysql_select_db("jokes") ) {
echo( "<p>Unable to locate the joke " .
"database at this time.</p>" );
exit();
}
// If a joke has been submitted,
// add it to the database.
if ($submitjoke == "SUBMIT") {
$sql = "INSERT INTO Jokes SET
JokeText='$joketext',
JokeDate=CURDATE()";
if (@mysql_query($sql)) {
echo("<p>Your joke has been added.</p>");
} else {
echo("<p>Error adding submitted joke: " .
mysql_error() . "</p>");
}
}
echo("<p> Here are all the jokes in our database: </p>");
// Request the text of all the jokes
$result = @mysql_query("SELECT JokeText FROM Jokes");
if (!$result) {
echo("<p>Error performing query: " . mysql_error() . "</p>");
exit();
}
// Display the text of each joke in a paragraph
while ( $row = mysql_fetch_array($result) ) {
echo("<p>" . $row["JokeText"] . "</p>");
}
// When clicked, this link will load this page
// with the joke submission form displayed.
echo("<p><a href='$PHP_SELF?addjoke=1'>Add a Joke!</a></p>");
endif;
?>
</body>
</html>
There we go! With a single file that contains a little PHP code we're able to view existing jokes, and add jokes to, our MySQL database.
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