您可以在本文中看到解决方案
http://www.microshell.com/database/sql/swap-values-in-2-rows- sql/
看一下： ，进行联接以从2行中获取数据并在1行中进行交换，之后进行更新就很容易了。
例如：
UPDATE
rules AS rule1
JOIN rules AS rule2 ON
( rule1.rule_id = 1 AND rule2.rule_id = 4 )
SET
rule1.priority = rule2.priority,
rule2.priority = rule1.priority
;
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