Fetching the particular post having post type page

I'm facing some problem when I fetch page content of particular Id. I'm using the code given below.

There is many pages in my database, I just want to show the page having id =30 and post_type=page. When I'm using the code given below it show all page content having post_type=page. But I just only the one. I think there is some syntax problem in my code.

<?php  
$loop = new WP_Query( array( 'post_type' => 'page','ID'=> 30) )开发者_开发百科;
while ( $loop->have_posts() ) : $loop->the_post();
  the_content();
endwhile;
?>  

Try this

global $wpdb;
$details = $wpdb->get_var("SELECT * FROM $wpdb->posts WHERE ID=30 and post_type='page'");
return $details;

or

<?php
  $args=array(
 'post_type'=>'page',
 'post__in' => array('595', '33', 44)
 );
$the_query = new WP_Query($args);
?>

Good luck

Errm, what happened to good old get_post(30)?