1.表数据结构

选择mysql记录上一条，下一条sql语句

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)