Mi problema es que cuando la búsqueda no encuentra ningún registro en la base de datos, en vez de que aparezca un mensaje diciendo, por ejemplo: NO se encontraron resultados!....; el resultado se queda en blanco.
Al quedarse en blanco es de alguna manera obvio que no se encontraron resultados, sin embargo es más amigable y presentable que aparezca un mensaje que indique esto.
¿Cómo puedo modificar el script para que muestre algún mensaje, si no se han encontrado registros en la Base de Datos?
Saludos y gracias,
A continuación pongo los scripts:
Página de búsqueda ---------------------------------------------------
Código PHP:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Joke CMS: Manage Jokes</title>
<meta http-equiv="content-type"
content="text/html; charset=iso-8859-1" />
</head>
<body>
<h1>Manage Jokes</h1>
<p><a href="newjoke.php">Create New Joke</a></p>
<?php
$dbcnx = @mysql_connect('localhost', 'root', 'psswd');
if (!$dbcnx) {
exit('<p>Unable to connect to the ' .
'database server at this time.</p>');
}
if (!@mysql_select_db('ijdb')) {
exit('<p>Unable to locate the joke ' .
'database at this time.</p>');
}
$authors = @mysql_query('SELECT id, name FROM author');
if (!$authors) {
exit('<p>Unable to obtain author list from the database.</p>');
}
$cats = @mysql_query('SELECT id, name FROM category');
if (!$cats) {
exit('<p>Unable to obtain category list from the database.</p>');
}
?>
<form action="jokelist.php" method="post">
<p>View jokes satisfying the following criteria:</p>
<label>By author:
<select name="aid" size="1">
<option selected value="">Any Author</option>
<?php
while ($author = mysql_fetch_array($authors)) {
$aid = $author['id'];
$aname = htmlspecialchars($author['name']);
echo "<option value='$aid'>$aname</option>\n";
}
?>
</select></label><br />
<label>By category:
<select name="cid" size="1">
<option selected value="">Any Category</option>
<?php
while ($cat = mysql_fetch_array($cats)) {
$cid = $cat['id'];
$cname = htmlspecialchars($cat['name']);
echo "<option value='$cid'>$cname</option>\n";
}
?>
</select></label><br />
<label>Containing text: <input type="text" name="searchtext" /></label><br />
<input type="submit" value="Search" />
</form>
<p><a href="index.html">Return to front page</a></p>
</body>
</html> Código PHP:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Joke CMS: Manage Jokes</title>
<meta http-equiv="content-type"
content="text/html; charset=iso-8859-1" />
</head>
<body>
<h1>Manage Jokes</h1>
<?php
$dbcnx = @mysql_connect('localhost', 'root', 'psswd');
if (!$dbcnx) {
exit('<p>Unable to connect to the ' .
'database server at this time.</p>');
}
if (!@mysql_select_db('ijdb')) {
exit('<p>Unable to locate the joke ' .
'database at this time.</p>');
}
// The basic SELECT statement
$select = 'SELECT DISTINCT id, joketext';
$from = ' FROM joke';
$where = ' WHERE 1=1';
$aid = $_POST['aid'];
if ($aid != '') { // An author is selected
$where .= " AND authorid='$aid'";
}
$cid = $_POST['cid'];
if ($cid != '') { // A category is selected
$from .= ', jokecategory';
$where .= " AND id=jokeid AND categoryid='$cid'";
}
$searchtext = $_POST['searchtext'];
if ($searchtext != '') { // Some search text was specified
$where .= " AND joketext LIKE '%$searchtext%'";
}
?>
<table>
<tr><th>Joke Text</th><th>Options</th></tr>
<?php
$jokes = @mysql_query($select . $from . $where);
if (!$jokes) {
echo '</table>';
exit('<p>Error retrieving jokes from database!<br />'.
'Error: ' . mysql_error() . '</p>');
}
while ($joke = mysql_fetch_array($jokes)) {
echo "<tr valign='top'>\n";
$id = $joke['id'];
$joketext = htmlspecialchars($joke['joketext']);
echo "<td>$joketext</td>\n";
echo "<td><a href='editjoke.php?id=$id'>Edit</a> | " .
"<a href='deletejoke.php?id=$id'>Delete</a></td>\n";
echo "</tr>\n";
}
?>
</table>
<p><a href="jokes.php">New search</a></p>
</body>
</html> 
