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Editorial Team
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Asked: 2026-06-04T05:43:15+00:00

I’m trying to call book details from the relationships table in my database, mysql

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I’m trying to call book details from the relationships table in my database, mysql is throwing an error with the syntax of the code. The previous page is 

  <html>
    <head>
    <title>Retrieve Relationships</title>
    </head>
    <body>

    <dl>

    <?php
    // Connect to database server
    mysql_connect("localhost","","") or die (mysql_error ());

    // Select database
    mysql_select_db("test") or die(mysql_error());

    // Get data from the database depending on the value of the id in the URL
    $title = (isset($_GET['title']) && is_string($_GET['title'])) ? $_GET['title'] : null;
$sTitle = mysql_real_escape_string($title);
$strSQL = "SELECT relationships.bookone, relationships.booktwo, relationships.relationship
FROM relationships, books
WHERE books.bookid=relationships.bookone AND relationships.bookone='{$sTitle}'";
     $rs = mysql_query($strSQL)
    // Loop the recordset $rs

    while($row = mysql_fetch_array($rs)){

        // Write the data of the person
        echo "<dt>Book One:</dt><dd>" . $row["bookone"] . "</dd>";
        echo "<dt>Book Two:</dt><dd>" . $row["booktwo"] . "</dd>";
        echo "<dt>Relationship:</dt><dd>" . $row["relationship"] . "</dd>";
        echo "<dt>Likes:</dt><dd>" . $row["relationshiplikes"] . "</dd>";
        echo "<dt>Dislikes:</dt><dd>" . $row["relationshipdislikes"] . "</dd>";

    }

    // Close the database connection
    mysql_close();
    ?>

    </dl>
    <p><a href="search.php">Return to the list</a></p>

    </body>

    </html>

what im trying to get the page to display is the bookone’s code and booktwo’s code where bookones id = booksid

any help would be greatly appreciated

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1 Answer

  1. Editorial Team

    It should be:

    $strSQL = "SELECT relationships.bookone, relationships.booktwo, relationships.relationship
FROM relationships, books
WHERE books.bookid=relationships.bookone AND relationships.bookone='{$_GET['bookone']}'";

    Though, really, it should be:

    $title = (isset($_GET['title']) && is_string($_GET['title'])) ? $_GET['title'] : null;
$sTitle = mysql_real_escape_string($title);
$strSQL = "SELECT relationships.bookone, relationships.booktwo, relationships.relationship
FROM relationships, books
WHERE books.bookid=relationships.bookone AND relationships.bookone='{$sTitle}'";

    SQL injection is rather bad :).

    (Not to mention that it would also harmlessly break if a user searched for a book with an apostrophe in the title.)

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