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Thread: link two tables

  1. #1
    Join Date
    Jul 2010
    Posts
    50

    link two tables

    Hi there,

    I am new to this and have a little issue I cannot quite work out.

    I have two tables

    Table name: gallery
    gallery_id, title, description, featured, created

    Table name: gallery_images
    image_id, gallery_id, image, caption, image_order

    I want to list the contents of the gallery table and call the images related to each field from the gallery images table.

    PHP Code:
    $gallery = new DataConn// pre set to connect to db
    $gallery->query("SELECT gallery.gallery_id, title, description, featured, image FROM gallery LEFT JOIN gallery_images ON gallery_images.gallery_id = gallery.gallery_id AND image_order = 0");

    while (
    $rs_gallery mysql_fetch_array($gallery->result))
    {
        
        echo 
    $rs_gallery['title'];
        echo 
    $rs_gallery['image'];
    ?> 
    This displays the title of each entry in the database and only one image associated with it.

    How can I loop through the images held in gallery_images and display them under each title?

    Any help would be great thank you,

  2. #2
    Join Date
    Jul 2010
    Location
    /ramdisk/
    Posts
    865
    Maybe you meant to ORDER BY the order... and not join on it. Also, if the column names are identical for a join you can write USING (column) instead of having to write out super long ON clauses (which can get confusing when you start joining lots of tables).

    PHP Code:

    $gallery 
    = new DataConn// pre set to connect to db
    $gallery->query("
         SELECT 
            gallery.gallery_id, title, description, featured, image 
         FROM gallery 
         LEFT JOIN gallery_images USING (gallery_id)
         ORDER BY gallery_id ASC, image_order ASC"
    );

    while (
    $rs_gallery mysql_fetch_assoc($gallery->result)) echo $rs_gallery['title'], $rs_gallery['image'];
    ?> 
    I also think if you use USING mysql can prove to itself that the gallery_id is no longer ambiguous and you no longer need to specify which table it belongs to. I might be wrong about that.

    Cheers
    Last edited by eval(BadCode); 06-23-2011 at 04:35 PM.
    I use (, ; : -) as I please- instead of learning the English language specification: I decided to learn Scheme and Java;

  3. #3
    Join Date
    Jul 2010
    Posts
    50

    solved it

    Hi there,

    Not sure what you mean by order by as I need to call info from one table that has the same id as a field from the main gallery table.

    I managed to fix it and here is the code for all who will find it of some help:-

    PHP Code:
    <h1>gallery</h1>
    <?php 
        $gallery 
    = new DataConn;
        
    $gallery->query("SELECT gallery.gallery_id, title, description, featured, image FROM gallery LEFT JOIN gallery_images ON gallery_images.gallery_id = gallery.gallery_id AND image_order = 0");

        while (
    $rs_gallery mysql_fetch_array($gallery->result))
        {
            
    $id $rs_gallery['gallery_id'];
            
    //echo $id;
            
    $images = new DataConn();
            
    $images->query("SELECT image, caption FROM gallery_images WHERE gallery_id = ".$id." ORDER BY image_order");
    ?>
    <div class="case-container">
    <div id="gallery">
    <?php
        $thumbs 
    '';
        if (
    $images->numRows() > 0)
        {
            
        
    ?>
        <a href="../images/featured/<?php echo $rs_gallery['featured']; ?>">
            <div class="magglass"></div>
            <img class="overlayglass" src="../images/featured/thumbs/<?php echo $rs_gallery['featured']; ?>"/>
        </a>
        <?php
            $i 
    0;
            while(
    $rs_images mysql_fetch_array($images->result))
            {
                if (
    $i == 0)
                
    ?>
                    <a href="../images/gallery/large/<?php echo $rs_images['image']; ?>"></a>
                <?php
                $i
    ++;
            }    
        }
        
    ?>
    </div>
    <h2><?php echo $rs_gallery['title']; ?></h2>
    <p><?php echo $rs_gallery['description']; ?></p>    
    </div>
    <?php ?>

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