mysql 上一条和下一条记录查询

SELECT
	bef.*
FROM
	(
		SELECT
			t.*
		FROM
			(
				SELECT
					@rownum :=@rownum + 1 AS rownum,
					t_article.*
				FROM
					(SELECT @rownum := 0) r,
					t_article 
				WHERE area_id = '69a7cc0cb74f719e58445f1fc3806387'
				AND category_id = 'a7c7a15302fe4942955a962aea9d5bb2'
				ORDER BY top_tag desc,create_time desc
			) t
		WHERE
			t.rownum < (
				SELECT
					w.rownum
				FROM
					(
						SELECT
							@rownum :=@rownum + 1 AS rownum,
							t_article.*
						FROM
							(SELECT @rownum := 0) r,
							t_article
						WHERE area_id = '69a7cc0cb74f719e58445f1fc3806387'
				    AND category_id = 'a7c7a15302fe4942955a962aea9d5bb2'
					  ORDER BY top_tag desc,create_time desc
					) w
				WHERE w.article_id = '353d2d71a68b44d6a3fef7928aa1bcfd'
			)
		ORDER BY
			t.rownum DESC
		LIMIT 1
	) bef
UNION ALL
	SELECT
	aft.*
FROM
	(
		SELECT
			t.*
		FROM
			(
				SELECT
					@rownum :=@rownum + 1 AS rownum,
					t_article.*
				FROM
					(SELECT @rownum := 0) r,
					t_article 
				WHERE area_id = '69a7cc0cb74f719e58445f1fc3806387'
				AND category_id = 'a7c7a15302fe4942955a962aea9d5bb2'
				ORDER BY top_tag desc,create_time desc
			) t
		WHERE
			t.rownum > (
				SELECT
					w.rownum
				FROM
					(
						SELECT
							@rownum :=@rownum + 1 AS rownum,
							t_article.*
						FROM
							(SELECT @rownum := 0) r,
							t_article
						WHERE area_id = '69a7cc0cb74f719e58445f1fc3806387'
				    AND category_id = 'a7c7a15302fe4942955a962aea9d5bb2'
					  ORDER BY top_tag desc,create_time desc
					) w
				WHERE w.article_id = '353d2d71a68b44d6a3fef7928aa1bcfd'
			)
		ORDER BY
			t.rownum ASC
		LIMIT 1
	)  aft