php - Bd consulting wordpress to show the

i have following query extract bd wordpress

$sql = "select * wp_posts post_content '%".$keywords."%' , post_status = 'publish' , post_type = 'post'";

i store information in array

$arr[] = array('id' => $obj->id, 'title' => $obj->post_title);

but can extract "the_excerpt();" or the_tags(); query this?

i need use ajax live search display results on screen

for ajax in wordpress here solution.

http://wptheming.com/2013/07/simple-ajax-example/

and data stored in posts, pages, , other custom post types here solution.

https://codex.wordpress.org/function_reference/query_posts

if find information useful give vote.

thanks.

Braziel