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<?php
$sqlConn = mysql_connect("localhost", "", "") or die("Couldn't connect to database");

$dbConn = mysql_select_db("", $sqlConn) or die("Couldn't connect to database");
$sql = "select * from nodes where parentId = 0 order by title asc";
$nodeResult = mysql_query($sql) or die("SELECT query failed");

$counter = 0;
?>

<ul>

<?php
while($node = mysql_fetch_array($nodeResult))
{
?>

    <li><?php echo $node[1]; ?></li>
    <li>
            <ul>

<?php
$sql = "select * from nodes where parentId = {$node[0]} order by title asc";
@$childResult = mysql_query($sql);

while($child = mysql_fetch_row($childResult))
{
?>
                <li><a href=""><?php echo $child[1]; ?></a></li>
<?php
}
?>
            </ul>
    </li>
    
<?php
}
?>

</ul>

<?php
$sqlConn = mysql_connect("localhost", "", "") or die("Couldn't connect to database");
 
$dbConn = mysql_select_db("", $sqlConn) or die("Couldn't connect to database");
$sql = "select * from nodes where parentId = 0 order by title asc";
$nodeResult = mysql_query($sql) or die("SELECT query failed");
 
$counter = 0;
?>
 
<ul>
 
<?php
while($node = mysql_fetch_array($nodeResult))
{
?>
 
    <li><?php echo $node[1]; ?></li>
    <li>
            <ul>
 
<?php
$sql = "select * from nodes where parentId = {$node[0]} order by title asc";
@$childResult = mysql_query($sql);
 
while($child = mysql_fetch_row($childResult))
{
?>
                <li><a href=""><?php echo $child[1]; ?></a></li>
<?php
}
?>
            </ul>
    </li>
 
<?php
}
?>
 
</ul>

CREATE TABLE `nodes` (
  `nodeId` int(11) NOT NULL auto_increment,
  `title` varchar(100) NOT NULL default '',
  `url` varchar(250) default NULL,
  `parentId` int(11) NOT NULL default '0',
  PRIMARY KEY  (`nodeId`),
  UNIQUE KEY `id` (`nodeId`)
) TYPE=MyISAM AUTO_INCREMENT=13 ;

INSERT INTO `nodes` VALUES (1, '1', '', 0);
INSERT INTO `nodes` VALUES (2, '2', '', 0);
INSERT INTO `nodes` VALUES (3, '3', '', 0);
INSERT INTO `nodes` VALUES (4, '1.1', '', 1);
INSERT INTO `nodes` VALUES (5, '1.2', '', 1);
INSERT INTO `nodes` VALUES (6, '1.3', '', 1);
INSERT INTO `nodes` VALUES (7, '2.1', '', 2);
INSERT INTO `nodes` VALUES (8, '2.2', '', 2);
INSERT INTO `nodes` VALUES (9, '2.3', '', 2);
INSERT INTO `nodes` VALUES (10, '3.1', '', 3);
INSERT INTO `nodes` VALUES (11, '3.2', '', 3);
INSERT INTO `nodes` VALUES (12, '1.1.1', '', 4);

CREATE TABLE `nodes` (
  `nodeId` int(11) NOT NULL auto_increment,
  `title` varchar(100) NOT NULL default '',
  `url` varchar(250) default NULL,
  `parentId` int(11) NOT NULL default '0',
  PRIMARY KEY  (`nodeId`),
  UNIQUE KEY `id` (`nodeId`)
) TYPE=MyISAM AUTO_INCREMENT=13 ;
 
INSERT INTO `nodes` VALUES (1, '1', '', 0);
INSERT INTO `nodes` VALUES (2, '2', '', 0);
INSERT INTO `nodes` VALUES (3, '3', '', 0);
INSERT INTO `nodes` VALUES (4, '1.1', '', 1);
INSERT INTO `nodes` VALUES (5, '1.2', '', 1);
INSERT INTO `nodes` VALUES (6, '1.3', '', 1);
INSERT INTO `nodes` VALUES (7, '2.1', '', 2);
INSERT INTO `nodes` VALUES (8, '2.2', '', 2);
INSERT INTO `nodes` VALUES (9, '2.3', '', 2);
INSERT INTO `nodes` VALUES (10, '3.1', '', 3);
INSERT INTO `nodes` VALUES (11, '3.2', '', 3);
INSERT INTO `nodes` VALUES (12, '1.1.1', '', 4);