显示数据库中的类别

Question

I'm trying to display categories for each post on an HTML table, and it's not giving any errors.

Well, the query is good. I didn't find any kind of misspelled variables.

<?php
$query = "SELECT * FROM  posts";
$se_posts = mysqli_query($connection,$query);
while ($row = mysqli_fetch_assoc($se_posts)) {
    $post_id = $row['post_id']; 
    $post_author = $row['post_author']; 
    $post_title = $row['post_title']; 
    $post_category_id = $row['post_category_id']; 
    $post_status = $row['post_status']; 
    $post_image = $row['post_image']; 
    $post_tags = $row['post_tags']; 
    $post_comment_count = $row['post_comment_count']; 
    $post_date = $row['post_date']; 

    echo "<tr>";
    echo "<td>{$post_id}</td>";
    echo "<td>{$post_author}</td>";
    echo "<td>{$post_title}</td>";

    // show post category
    $query = "SELECT * FROM categories WHERE cat_id Like $post_category_id";
    $query_update_cat = mysqli_query($connection, $query);

    while ($row = mysqli_fetch_assoc($query_update_cat)) {
        $cat_id = $row['cat_id'];  
        $cat_title = $row['cat_title'];

        echo "<td>{$cat_title}</td>";
    }

    echo "<td>{$post_status}</td>";
    echo "<td><img class='img-responsive' width='100'src='../images/{$post_image}'></td>";
    echo "<td>{$post_tags}</td>";
    echo "<td>{$post_comment_count}</td>";
    echo "<td>{$post_date}</td>";
    echo "<td><a href='post.php?delete={$post_id}'>delete</a></td>";
    echo "<td><a href='post.php?source=edit_post&p_id={$post_id}'>Edit</a></td>";

    echo "</tr>";
}  
?>

Answer 1

there is a problem that you are making a request on every post (or article). And this is wrong, you should reduce the number of requests as much as you can. Also, you are using LIKE !! you should use equal '='.

for your query:

at this inside the categories loop you should define $cat_title before the loop, then set it in the loop, and outside the loop print it :

$cat_title = "";
while($row = mysqli_fetch_assoc($query_update_cat)){
    $cat_id = $row['cat_id'];  
    $cat_title = $row['cat_title'];
}
echo "<td>{$cat_title}</td>";

try with this query with JOIN:

<?php
$query = "SELECT * FROM  posts JOIN categories ON (posts.post_category_id = categories.cat_id)";

$se_posts= mysqli_query($connection,$query);
?>
<table>
<tr>
    <td>post id</td>
    <td>post author</td>
    <td>post title</td>
    <td>category</td>
    <td>post status</td>
    <td>image</td>
    <td>tags</td>
    <td>comment count</td>
    <td>date</td>
    <td>action</td>
</tr>
<?php
while($row = mysqli_fetch_assoc($se_posts)) {
    echo "<tr>";
    echo "<td>{$row['post_id']}</td>";
    echo "<td>{$row['post_author']}</td>";
    echo "<td>{$row['post_title']}</td>";
    echo "<td>{$row['cat_title']}</td>";
    echo "<td>{$row['post_status']}</td>";
    echo "<td><img class='img-responsive' width='100'src=\"../images/{$row['post_image']}\"></td>";
    echo "<td>{$row['post_tags']}</td>";
    echo "<td>{$row['post_comment_count}</td>";
    echo "<td>{$row['post_date']}</td>";
    echo "<td><a href=\"post.php?delete={$row['post_id']}\">delete</a></td>";
    echo "<td><a href=\"post.php?source=edit_post&p_id={$row['post_id']}\">Edit</a></td>";
echo "</tr>";
}
?>
</table>