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BOOK: Beginning PHP, Apache, MySQL Web Development ISBN: 978-0-7645-5744-6
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Old August 27th, 2012, 02:52 PM
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Default Error in displaying reviews.

IN THE BELOW MENTIONED EXAMPLE FROM CHAPTER 4: USING TABLES TO DISPLAY DATA I AM GETTING ERROR AS: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 3. Below is the program and please help me out.

<?php

//function to generate ratings
function generate_ratings($rating) {
$movie_rating = '';
for ($i = 0; $i < $rating; $i++) {
$movie_rating .= '<img src="star.jpeg" alt="star"/>';
}
return $movie_rating;
}

//Function to take Id of a director and return his full name
function get_director($director_id) {
global $db;
$query = 'SELECT people_fullname
FROM people
WHERE people_id = ' . $director_id;
$result = mysql_query($query, $db) or die(mysql_error($db));
$row = mysql_fetch_assoc($result);
extract($row);
return $people_fullname;
}

//Function to take Id of a lead_actor and return his full name
function get_leadactor($leadactor_id) {
global $db;
$query = 'SELECT people_fullname
FROM people
WHERE people_id = ' . $leadactor_id;
$result = mysql_query($query, $db) or die(mysql_error($db));
$row = mysql_fetch_assoc($result);
extract($row);
return $people_fullname;
}

//Function to take id of a movie type and return type of movie.
function get_movietype($type_id) {
global $db;
$query = 'SELECT movietype_label
FROM movietype
WHERE movietype_id = ' .$type_id;
$result = mysql_query($query, $db) or die(mysql_error($db));
$row = mysql_fetch_assoc($result);
extract($row);
return $movietype_label;
}

//This function will calculate whether the movie earned profit or went loss or even broke too.
function calculate_differences($takings, $cost) {
$difference = $takings - $cost;

if($difference < 0) {
$color = 'red';
$difference = '$'. abs($difference) . 'million';
} elseif ($difference > 0) {
$color = 'green';
$difference = '$'. $difference . 'million';
} else {
$color = 'blue';
$difference = 'broke even';
}

return '<span style="color:' . $color . ';">' . $difference . '</span>';
}
//connect to MySQL
$db = mysql_connect('localhost', 'satish', 'zoomin') or die('Unable to connect.');
mysql_select_db('moviesite', $db) or die(mysql_error($db));

//retrieve information
$query = 'SELECT movie_name, movie_year, movie_director, movie_leadactor, movie_type, movie_running_time, movie_cost, movie_takings
FROM movie
WHERE movie_id = ' . $_GET['movie_id'];
$result = mysql_query($query, $db) or die(mysql_error($db));

$row = mysql_fetch_assoc($result);
$movie_name = $row['movie_name'];
$movie_director= get_director($row['movie_director']);
$movie_leadactor = get_leadactor($row['movie_leadactor']);
$movie_year = $row['movie_year'];
$movie_running_time = $row['movie_running_time'] . ' mins';
$movie_takings = $row['movie_takings']. 'million';
$movie_cost = $row['movie_cost'] . 'million';
$movie_health = calculate_differences($row['movie_takings'],$row['movie_cost']);

//display complete information.
echo <<<ENDHTML
<html>
<head>
<title> Details and Reviews for: $movie_name </title>
</head> <body>
<div style ="text-align: center;">
<h2>$movie_name</h2> <h3><em>DETAILS</em></h3>
<table cellpadding="2" cellspacing ="2"
style="width: 70%; margin-left: auto; margin-right: auto;">
<tr>
<td><strong>Title</strong></td> <td>$movie_name</td>
<td><strong>Release Year</strong></td> <td>$movie_year</td>
</tr>
<tr>
<td><strong>Movie Director</strong></td> <td>$movie_director</td>
<td><strong>Cost</strong></td> <td>$movie_cost</td>
</tr>
<tr>
<td><strong>Lead Actor</strong></td> <td>$movie_leadactor</td>
<td><strong>Takings</strong></td> <td>$movie_takings</td>
</tr>
<tr>
<td><strong>Running Time</strong></td> <td> $movie_running_time</td>
<td><strong>Health</strong></td> <td>$movie_health</td>
</tr>
</table>
ENDHTML;

//retrieve reviews for this movie
$query = 'SELECT
review_movie_id, review_date, reviewer_name, review_comment, review_rating
FROM
reviews
WHERE
review_movie_id = ' .$_GET['movie_id'] . '
ORDER BY
review_date DESC';
$result = mysql_query($query, $db) or die(mysql_error($db));

//display the reviews.
echo <<<ENDHTML
<h3><em> REVIEWS </em> </h3>
<table cellpadding="2" cellspacing="2"
style ="width: 90%; margin-left: auto; margin-right: auto;">
<tr>
<th style="width: 7em;"> Date </th>
<th style="width: 10em;"> Reviewer </th>
<th> Comments </th>
<th style="width: 5em;"> Rating </th>
</tr>
ENDHTML;

while ($row = mysql_fetch_assoc($result)) {
$date = $row['review_date'];
$name = $row['review_name'];
$comment = $row['review_comment'];
$rating = generate_ratings($row['review_rating']);

echo <<<ENDHTML
<tr>
<td style="vertical-align:top; text-align: center;">$date</td>
<td style="vertical-align:top;">$name</td>
<td style="vertical-align:top;">$comment</td>
<td style="vertical-align:top;">$rating</td>
</tr>
ENDHTML;
}
echo <<<ENDHTML
</div>
</body>
</html>
ENDHTML;
?>





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