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add column to mysql table if it does not exist
My research and experiments haven't yielded an answer yet, so I am hoping for some help.
16 Answers
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Web API 最佳入门指南 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...ts, including browsers and mobile devices. ASP.NET Web API is an ideal platform for building RESTful applications on the .NET Framework.
Web API在ASP.NET完整框架中地位如下图，与SignalR一起同为构建Service而服务的框架。Web API负责构建http常规服务，而SingalR主要...
URL encoding the space character: + or %20?
...a (emphasis and link added):
When data that has been entered into HTML forms is submitted, the form field names and values are encoded and sent to the server in an HTTP request message using method GET or POST, or, historically, via email. The encoding used by default is based on a very early ve...
SQlite Getting nearest locations (with latitude and longitude)
...a that you need to evaluate in your java code. Use the following procedure for this purpose:
To have a deterministic threshold and more accurate filter on data, It is better to calculate 4 locations that are in radius meter of the north, west, east and south of your central point in your java code ...
How to set selected value of jquery select2?
...I don't think it's possible without going to JavaScript solutions. Looking for another jQuery/Bootstrap Select2 dropdown now (2 days of fiddling every conceivable method - no joy!)
– MC9000
Nov 5 '16 at 5:17
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How to do relative imports in Python?
...the package hierarchy. If the module's name does not contain any package information (e.g. it is set to '__main__') then relative imports are resolved as if the module were a top level module, regardless of where the module is actually located on the file system.
In Python 2.6, they're adding the ...
_=> what does this underscore mean in Lambda expressions?
...ut and from there, it spills over into other programming languages. It is, for example, also used in Ruby to mean the same thing as in this example, even though _ has absolutely no special significance in Ruby.
– Jörg W Mittag
May 6 '10 at 5:33
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Add custom messages in assert?
...this! If a==b is false, the and-expression should also be false, and, therefore, the string should not be evaluated.
– ragnarius
Nov 7 '14 at 17:31
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What is getattr() exactly and how do I use it?
...in advance which attribute you want (it comes from a string). Very useful for meta-programming.
you want to provide a default value. object.y will raise an AttributeError if there's no y. But getattr(object, 'y', 5) will return 5.
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Is it safe to push_back an element from the same vector?
... value) is required to work because the standard
doesn't give permission for it not to work.
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