Why wp_query return 1 row if i have 3 row pass in it

Use wp_parse_id_list to split a comma separated string of IDs into an array:

'post__in' => wp_parse_id_list( $post_id ),

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