Не обновляется БД из textarea

$table_name_posts = 'sometable';
    if(isset($_POST['app_lastprice'])){
        $sql = ('UPDATE '.$table_name_posts.' SET app_lastprice='.$_POST['app_lastprice'].' WHERE app_id = '.$_POST['id']);
        $result2 = mysql_query($sql);   
    }
    if(isset($_POST['app_descr'])){
        $sql = ('UPDATE '.$table_name_posts.' SET app_desc='.mysql_real_escape_string($_POST['app_descr']).' text WHERE app_id = '.$_POST['id']);
        $result2 = mysql_query($sql);   
    }
    if(isset($_POST['app_price'])){
        $sql = ('UPDATE '.$table_name_posts.' SET app_price='.$_POST['app_price'].' WHERE app_id = '.$_POST['id']);
        $result2 = mysql_query($sql);   
    }
 
    if(isset($_POST['id'])){
        $sql = ('SELECT app_name as app_name, app_id as app_id, app_desc as app_desc, app_lastprice as app_lastprice, app_price as app_price FROM '.$table_name_posts.' WHERE app_id= '.$_POST['id']);  
        $result = mysql_query($sql);
        $stuff = mysql_fetch_assoc($result);
        echo '<form action="filter_all.edit.php" method="post"><input type="hidden" name="id" value="'.$stuff[app_id].'"><table class="table table-bordered"><thead><tr><th>Имя</th><th>Пред.цена</th><th>Тек.цена</th><th>Описание</th><th></th></tr></thead>';
        echo '<tr id="'.$stuff[app_id].'">';
        echo '<td id="name" width="200px">'.$stuff[app_name].'</td>';
        echo '<td id="lastprice"><input type="text" name="app_lastprice" value="'.$stuff[app_lastprice].'"></td>';
        echo '<td id="currprice"><input type="text" name="app_price" value="'.$stuff[app_price].'"></td>';
        echo '<td id="desc"><textarea name="app_descr" style="margin: 0px; width: 550px; height: 300px;">'.$stuff[app_desc].'</textarea></td>';
        echo '<td id="button"><button type="submit" class="btn btn-danger">ОБНОВИТЬ</button></td></tr>';
        echo '</table></form>';
    }
    else{
        echo '<div class="alert alert-danger">id не указан</div>';
        
    }