Question

我想显示＆＃34;类别＆＃34;作为链接的书籍和单击链接时（例如：Art），我想提取属于该特定类别的数据（例如：艺术 - ＆gt;颜色和光由James Gurney，艺术精神由Robert Henry ，David Bayles的Art＆amp; Fear等等......）

这是我的数据库结构，我有一个数据库（booksdb），它有两个名为（category）和（listing）的表。

Table : category
+--------+----------+
| cat_id | category |
+--------+----------+
|      1 | Art      |
|      2 | Drama    |
|      3 | Music    |
|      4 | Fiction  |
|      5 | Computer |
+--------+----------+


Table: listing
+----+--------+---------------------------------+-----------------------+
| id | cat_id | title                           | author                |
+----+--------+---------------------------------+-----------------------+
|  1 |      1 | Color and Light                 | James Gurney          |
|  2 |      1 | The Art Spirit                  | Robert Henry          |
|  3 |      1 | Art & Fear                      | David Bayles          |
|  4 |      1 | How Pictures Work               | Molly Bang            |
|  5 |      1 | Imaginative Realism             | James Gurney          |
|  6 |      2 | A Walk To Remember              | Nicholas Sparks       |
|  7 |      2 | An Old Fashioned Girl           | Louisa May Alcott     |
|  8 |      3 | The Rest Is Noise               | Alex Ross             |
|  9 |      3 | It Still Moves                  | Amanda Petrusich      |
| 10 |      3 | Chronicles                      | Bob Dylan             |
| 11 |      3 | Dream Boogie                    | Peter Guralnick       |
| 12 |      3 | Escaping The Delta              | Robert Johnson        |
| 13 |      4 | Atlas Shrugged                  | Ayn Rand              |
| 14 |      4 | Anthem                          | Ayn Rand              |
| 15 |      4 | Sons and Lovers                 | D.H. Lawrence         |
| 16 |      4 | Henderson the Rain King         | Saul Bellow           |
| 17 |      5 | The Art of Computer Programming | Donald Knuth          |
| 18 |      5 | The Art of Unix Programming     | Eric Raymond          |
| 19 |      5 | Free Software, Free Society     | Richard M. Stallman   |
| 20 |      5 | Database System Concepts        | Abraham Silberschatz  |
| 21 |      5 | 3ds Max 2008 in Simple Steps    | Kognet Solutions Inc. |
+----+--------+---------------------------------+-----------------------+

Answer 1

考虑这个例子：

首先，您必须使用PHP提取这些值。提取后，您现在可以在HTML上显示它。您可以使用下拉框（在此示例中为此）选择要查看的类别。

<强>的index.php

<?php

// use $_GET variable for your query
$category = (isset($_GET['category']) && $_GET['category'] != '') ? (int) $_GET['category'] : null;

// connect to mysql
$con = mysqli_connect("localhost","user","password","database");

// build your query
$query_statement = 'SELECT `listing`.`id`, `listing`.`cat_id`, `category`.`category`, `listing`.`title`, `listing`.`author` FROM `listing` LEFT JOIN `category` ON `listing`.`cat_id` = `category`.`cat_id`';
if($category != null) {
    $query_statement = $query_statement . " WHERE `category`.`cat_id` = $category";
}

$query = mysqli_query($con, $query_statement);

?>

<!-- HTML -->
<!-- Loop them inside a table -->
<form method="GET" action="index.php">
    <select name="category" onchange="this.form.submit()">
        <option disabled selected>Select Category</option>
        <option value="">All</option>
        <option value="1">Art</option>
        <option value="2">Drama</option>
        <option value="3">Music</option>
        <option value="4">Fiction</option>
        <option value="5">Computer</option>
    </select>
</form>

<table border="1" cellpadding="10">
    <thead>
        <tr>
            <th>Category</th>
            <th>Title</th>
            <th>Author</th>
        </tr>
    </thead>
    <tbody>
    <?php while($result = mysqli_fetch_assoc($query)): ?>
        <tr>
            <td><?php echo $result['category']; ?></td>
            <td><?php echo $result['title']; ?></td>
            <td><?php echo $result['author']; ?></td>
        </tr>
    <?php endwhile; ?>
    </tbody>
</table>

编辑：

<!-- LINKS (if you need links you can do something like this) -->
<a href="index.php?category=1">Art</a>
<a href="index.php?category=2">Drama</a>
<a href="index.php?category=3">Music</a>
<a href="index.php?category=4">Fiction</a>
<a href="index.php?category=5">Computer</a>

注意：尝试研究更多这些内容，然后尝试增强其部分内容，例如安全性等。只是将其作为迈向学习更多内容的垫脚石，因为您没有发布了与问题相关的任何代码。

将2个表中的数据显示为链接

1 个答案: