Get nav bar menu form menu appearance

Need help to get navigation menu form appearance menu.

<nav id="site-navigation" class="main-navigation" role="navigation">

	<ul id="menu-breakthrough" class="nav-menu"><?php $mypages = get_pages('parent=0&sort_order=DESC&sort_column=menu_order&exclude=58');
foreach($mypages as $page)

	{ echo '<li id="menu-item-'.$page->ID.'" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-'.$page->ID.'"><a>post_name.'/">'.$page->post_title.'</a>';
				 $querystr = "

				SELECT option_value

				FROM  <code>wp_options</code> 

				WHERE  <code>option_name</code> =  'ep_exclude_pages'

				LIMIT 0 , 30

				 ";

				$wp_options = $wpdb->get_results($querystr, OBJECT);

				$children = get_children(array( 

								'post_parent' => $page->ID,

								'order' => 'ASC', 'orderby' => 'menu_order ID',

								'post_type'   => 'page', 

								'numberposts' => -1,

								'post_status' => 'any',

								'exclude'	  => $wp_options[0]->option_value

							));

				if( count( $children ) != 0 ) { 

					echo '

<ul>';

					foreach($children as $page2)
{echo '<li id="menu-item-'.$page2->ID.'" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-'.$page2->ID.'"><a>post_name.'/'.$page2->post_name.'/">'.$page2->post_title.'</a>';}
echo '</ul>
';
}
echo '';
}
?>

</nav>

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