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【转】用App Inventor 2实现电子围栏功能 - App应用开发 - 清泛IT社区，为创新赋能！
...le（矩形）。我这里用了Circle和Polygon。
步骤1 添加组件
组件说明：圆形围栏按钮：用于显示圆形围栏并判断当前位置是否在圆形围栏内多边形围栏按钮：用于显示多边形围栏并判断当前位置是否在多边形围栏...
optional local variables in rails partial templates: how do I get out of the (defined? foo) mess?
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The SMTP server requires a secure connection or the client was not authenticated. The server respons
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Recursive file search using PowerShell
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Use the Get-ChildItem cmdlet with the -Recurse switch:
Get-ChildItem -Path V:\Myfolder -Filter ...
Eclipse hangs at the Android SDK Content Loader
I've been working with Eclipse 4.2 (Juno release 20120920-0800) on OS X 10.8.2 for a few weeks now, building apps for Android 3.0 and above. I have a quad core i7 MacBook Pro with an SSD, so performance is not an issue. Everything was fine.
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Bash script to cd to directory with spaces in pathname
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Can regular expressions be used to match nested patterns? [duplicate]
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How to match “anything up until this sequence of characters” in a regular expression?
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How to force a WPF binding to refresh?
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edited May 23 '17 at 12:03
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answered Apr 15 '11 at 11:50
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On Duplicate Key Update same as insert
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Alternatively, you can use:
INSERT INTO table (id,a,b,c,d,e,f,g)
VALUES (1,2,3,4,5,6,7,8)
ON DUPLICATE KEY
UPDATE a=a, b=b, c=c, d=d, e=e, f=f, g=g;
To get the id from LAST_INSERT_ID; you need to specify the backend app you're using for the same.
For LuaSQL, a conn:getlastautoid() fetches ...