Can't insert into WordPress DB

I’m having some trouble inserting data in to a table that I’ve created. Is there anything wrong with this code? None of them works.

$wpdb->query(
			$wpdb->prepare('INSERT INTO gowestgallery
				(main_url, thumbnail_url, title, text) values (%s, %s, %s, %s)',
				$main_url, $thumbnail_url, $title, $text
			)
		);

		$wpdb->insert('gowestgallery', array(
			'main_url' => $main_url,
			'thumbnail_url' => $thumbnail_url,
			'title' => $title,
			'text' => $text
			), array( '%s', '%s', '%s', '%s', ));
	*/

		// Insert the post into the database
		wp_insert_post(array(
			'main_url' => $main_url,
			'thumbnail_url' => $thumbnail_url,
			'title' => $title,
			'text' => $text
		));