mysql选择上一条、下一条数据记录

1.表数据结构

SELECT * FROM user ORDER BY rank ASC

+----+------+---------+
| ID | rank | name    |
+----+------+---------+
|  1 |    1 | admin1  |
|  2 |    2 | admin2  |
|  3 |    3 | admin3  |
|  4 |    4 | admin4  |
|  5 |    5 | admin5  |
|  6 |    6 | admin6  |
|  7 |    7 | admin7  |
|  8 |    8 | admin8  |
|  9 |    9 | admin9  |
| 10 |   10 | admin10 |
| 11 |   11 | admin11 |
| 12 |   12 | admin12 |
+----+------+---------+

2.选择上一行

select * from user where id <3 or id=(SELECT MIN(id) from user) order by id desc limit 1

+----+------+--------+
| ID | rank | name   |
+----+------+--------+
|  2 |    2 | admin2 |
+----+------+--------+
1 row in set (0.00 sec)

3.当id=1时

mysql> select * from user where id <1 or id=(SELECT MIN(id) from user) order by id desc limit 1;
+----+------+--------+
| ID | rank | name   |
+----+------+--------+
|  1 |    1 | admin1 |
+----+------+--------+
1 row in set (0.00 sec)

4.选择下一行

mysql> select * from user where id > 3 OR ID=(SELECT MAX(ID) FROM user) ORDER BY id ASC LIMIT 1;
+----+------+--------+
| ID | rank | name   |
+----+------+--------+
|  4 |    4 | admin4 |
+----+------+--------+
1 row in set (0.00 sec)

5.当id为最大值时

mysql> select * from user where id > 12 OR ID=(SELECT MAX(ID) FROM user) ORDER BY id ASC LIMIT 1;
+----+------+---------+
| ID | rank | name    |
+----+------+---------+
| 12 |   12 | admin12 |
+----+------+---------+
1 row in set (0.00 sec)