the_content getting current page content instead specified ID

Set postdata after get_post to set their data.

$id=12; 
$post = get_post($id); 
setup_postdata($post);
$content = apply_filters('the_content', $post->post_content); 
echo $content; 


wp_reset_postdata();

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)