One-to-many joins with Zend_Db_Table_Select – Rob Allen's DevNotes

:

Let's say that you want to set up a one-to-many relationship between two tables: Artists and Albums because you've refactored my ZF1 tutorial.

Let's assume that an artist has many albums. These are the basic table definitions:

artists table: id, artist
albums table: id, artist_id, title

When you list the albums, you obviously want to see the artist name rather than the id, so clearly you use a join!

Assuming you're using Zend_Db_Table, the easiest way is to turn off the integrity check and do a join in a mapper or table method.

Something like this:


class AlbumTable extends Zend_Db_Table_Abstract
{
protected $_name = 'album';

public function fetchAllWithArtistName($order = array('title ASC'))
{
$select = $this->select();
$select->setIntegrityCheck(false);
$select->from($this->_name);

$select->joinLeft('artist', 'album.artist_id = artist.id',
array('artist_name' => 'name'));
$select->order($order);

$rows = $this->fetchAll($select);
return $rows;
}

}

The row set returned will have all the columns from the albums table and one additional column called artist_name which is an alias of the name column from the artists table.