SQLite 中的 IF NOT EXISTS 怎么办

How to do IF NOT EXISTS in SQLite(SQLite 中的 IF NOT EXISTS 怎么办)
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!

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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