SQLITE批量UPDATE语句
发布时间:2020-12-12 19:01:05 所属栏目:百科 来源:网络整理
导读:我想执行许多SQL UPDATE语句,如下所示: UPDATE cityd SET time_zone='-7.000000' WHERE locId = 173567;UPDATE cityd SET time_zone='-8.000000' WHERE locId = 173568;UPDATE cityd SET time_zone='-6.000000' WHERE locId = 173569;UPDATE cityd SET time
我想执行许多SQL UPDATE语句,如下所示:
UPDATE cityd SET time_zone='-7.000000' WHERE locId = 173567; UPDATE cityd SET time_zone='-8.000000' WHERE locId = 173568; UPDATE cityd SET time_zone='-6.000000' WHERE locId = 173569; UPDATE cityd SET time_zone='-5.000000' WHERE locId = 173570; UPDATE cityd SET time_zone='-6.000000' WHERE locId = 173571; 我想优化事务时间,所以我需要使用BEGIN TRANSACTION / COMMIT对.如何在SQLtite Manager中的SQL语法中编写它? 编辑: 解决方法根据 SQL Documention,CASE有两种支持的语法CASE x WHEN w1 THEN r1 WHEN w2 THEN r2 ELSE r3 END CASE WHEN x = w1 THEN r1 WHEN x = w2 THEN r2 ELSE r3 END 因此,您的多个UPDATE语句可以进一步简化为 UPDATE cityd SET time_zone = CASE locId WHEN 173567 THEN '-7.000000' WHEN 173568 THEN '-8.000000' WHEN 173569 THEN '-6.000000' WHEN 173570 THEN '-5.000000' WHEN 173571 THEN '-6.000000' END WHERE locId IN (173567,173568,173569,173570,173571) (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |