我有这样的简单表：
+----------+---------------+-------------+
| ID (int) | KEY (varchar) | VALUE (int) |
+----------+---------------+-------------+
| 1 | asdf | 100 |
| 2 | fdsa | 321 |
| 3 | ecda | 211 |
+----------+---------------+-------------+
我想更新行KEY = 'something'但如果没有行在哪里KEY = 'something'我想要INSERT新行：
+----------+---------------+-------------+
| ID (int) | KEY (varchar) | VALUE (int) |
+----------+---------------+-------------+
| 1 | asdf | 100 |
| 2 | fdsa | 321 |
| 3 | ecda | 211 |
| 4 | something | 200 |
+----------+---------------+-------------+
是否可以只在一个查询中进行？
您可以利用ON DUPLICATE KEY UPDATE
INSERT INTO yourtable (`id`, `key`, `value`) VALUES (4, 'something', 200)
ON DUPLICATE KEY UPDATE `value` = 200;
key列上应该有唯一索引
SQLFiddle http://sqlfiddle.com/#!2/ce362/1
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