SQLite 中的 IF NOT EXISTS 怎么办

发布时间：2023-08-09 16:17:59 来源：互联网作者：匿名标签：error How to do IF NOT EXISTS in SQLite exception IT资讯 sql sqlite 技术社区教程下载程序员热度：37.5℃

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小编来一起学习吧！

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?

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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Sqlite CTE-INSERT INTERGER提供