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copied!<p>Finally found a way to do this and it has to be done with multiple queries.</p> <p>The tables are set up so that when you enter a new YouTube video reference into <strong>vids</strong> table it gets an autoincrement <strong>vid_id</strong>. The junction table, <strong>list_vid_junc</strong>, is MyISAM and has 3 columns: <strong>list_id</strong>, <strong>vid_id</strong> and <strong>sort</strong>. The primary key is made up of <strong>list_id</strong> and <strong>sort</strong>, with <strong>sort</strong> set to autoincrement. This allows multiple entries of the same video in a list, which can be sorted by the <strong>sort</strong> autoincrement.</p> <p>Note that in a MyISAM table because the primary key index is split this way, mySql starts the <strong>sort</strong> autoincrement from 1 for each new list that is created rather than making every sort a unique number, see <a href="http://dev.mysql.com/doc/refman/5.5/en/example-auto-increment.html#id583323" rel="nofollow">http://dev.mysql.com/doc/refman/5.5/en/example-auto-increment.html#id583323</a>. List 1 can contain sort ids of 1,2,3 and list 2 can also have sort ids of 1,2,3. The pairs are unique not the individual numbers.</p> <p>This is not a production version, just the basic solution:</p> <pre><code>class DbService { var $username = "user"; var $password = "password"; var $server = "localhost"; var $port = "3306"; var $databasename = "database"; var $connection; public function __construct() { $this->connection = mysqli_connect( $this->server, $this->username, $this->password, $this->databasename, $this->port ); $this->throwExceptionOnError($this->connection); } // returns array of (vidID, sort); adds duplicate vids to list if run 2+ times public function addToPlaylist($ytRef, $listID) { $stmt = mysqli_prepare($this->connection, "INSERT IGNORE INTO vids(yt_ref) VALUES (?)"); mysqli_bind_param($stmt, 's', $ytRef); mysqli_stmt_execute($stmt); $vidID = mysqli_stmt_insert_id($stmt); // 0 if video already exists mysqli_stmt_free_result($stmt); if ($vidID == 0) { $stmt = mysqli_prepare($this->connection, "SELECT vid_id FROM vids WHERE yt_ref = ? LIMIT 1"); mysqli_bind_param($stmt, 's', $ytRef); mysqli_stmt_execute($stmt); mysqli_stmt_bind_result($stmt, $vidID); mysqli_stmt_fetch($stmt); mysqli_stmt_free_result($stmt); } $stmt = mysqli_prepare($this->connection, "INSERT IGNORE INTO fr_list_vid_junc(vid_id, list_id) VALUES(?, ?)"); mysqli_stmt_bind_param($stmt, 'ii', $vidID, $listID); mysqli_stmt_execute($stmt); mysqli_stmt_free_result($stmt); mysqli_close($this->connection); $arr = array($vidID, mysqli_stmt_insert_id($stmt)); return $arr; } } </code></pre> <p>I am sure there are many ways this can be improved so any suggestions would be welcome.</p>

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