id | photo title | created_date XEi43 | my family | 2009 08 04 dDls | friends group | 2009 08 05 32kJ | beautiful place | 2009 08 06 EOIk | working late | 2009 08 07
说我的身份是32kJ.如何获得下一行或前一个？
解决方法
这是我用来查找上一个/下一个记录.表中的任何列都可以用作排序列,并且不需要连接或讨厌的黑客：
下一条记录(日期大于当前记录)：
SELECT id,title,MIN(created) AS created_date FROM photo WHERE created > (SELECT created FROM photo WHERE id = '32kJ') GROUP BY created ORDER BY created ASC LIMIT 1;
上一记录(日期小于当前记录)：
SELECT id,MAX(created) AS created_date FROM photo WHERE created < (SELECT created FROM photo WHERE id = '32kJ') GROUP BY created ORDER BY created DESC LIMIT 1;
例：
CREATE TABLE `photo` (
`id` VARCHAR(5) NOT NULL,`title` VARCHAR(255) NOT NULL,`created` DATETIME NOT NULL,INDEX `created` (`created` ASC),PRIMARY KEY (`id`)
)
ENGINE = InnoDB;
INSERT INTO `photo` (`id`,`title`,`created`) VALUES ('XEi43','my family','2009-08-04');
INSERT INTO `photo` (`id`,`created`) VALUES ('dDls','friends group','2009-08-05');
INSERT INTO `photo` (`id`,`created`) VALUES ('32kJ','beautiful place','2009-08-06');
INSERT INTO `photo` (`id`,`created`) VALUES ('EOIk','working late','2009-08-07');
SELECT * FROM photo ORDER BY created;
+-------+-----------------+---------------------+
| id | title | created |
+-------+-----------------+---------------------+
| XEi43 | my family | 2009-08-04 00:00:00 |
| dDls | friends group | 2009-08-05 00:00:00 |
| 32kJ | beautiful place | 2009-08-06 00:00:00 |
| EOIk | working late | 2009-08-07 00:00:00 |
+-------+-----------------+---------------------+
SELECT id,MIN(created) AS next_date
FROM photo
WHERE created >
(SELECT created FROM photo WHERE id = '32kJ')
GROUP BY created
ORDER BY created ASC
LIMIT 1;
+------+--------------+---------------------+
| id | title | next_date |
+------+--------------+---------------------+
| EOIk | working late | 2009-08-07 00:00:00 |
+------+--------------+---------------------+
SELECT id,MAX(created) AS prev_date
FROM photo
WHERE created <
(SELECT created FROM photo WHERE id = '32kJ')
GROUP BY created
ORDER BY created DESC
LIMIT 1;
+------+---------------+---------------------+
| id | title | prev_date |
+------+---------------+---------------------+
| dDls | friends group | 2009-08-05 00:00:00 |
+------+---------------+---------------------+
