本文介绍了SQLite 中的 IF NOT EXISTS 怎么办的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着跟版网的小编来一起学习吧！
问题描述
我正在尝试将此行从 MS SQL Server 移植到 SQLite
I am trying to port this line from MS SQL Server to SQLite
IF NOT EXISTS(SELECT 1 FROM EVENTTYPE WHERE EventTypeName = 'ANI Received')
INSERT INTO EVENTTYPE (EventTypeName) VALUES ('ANI Received');
似乎 SQLite 不支持 IF NOT EXISTS 或至少我无法使其工作.我错过了一些简单的东西吗?有解决方法吗?
It seems that SQLite does not support IF NOT EXISTS or at least I can't make it work. Am I missing something simple? Is there a workaround?
推荐答案
这个怎么样?
INSERT OR IGNORE INTO EVENTTYPE (EventTypeName) VALUES 'ANI Received'
(未经测试，因为我没有 SQLite ......但是这个链接非常具有描述性.)
(Untested as I don't have SQLite... however this link is quite descriptive.)
此外，这也应该有效:
INSERT INTO EVENTTYPE (EventTypeName)
SELECT 'ANI Received'
WHERE NOT EXISTS (SELECT 1 FROM EVENTTYPE WHERE EventTypeName = 'ANI Received');
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