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Unique constraint that allows empty values in MySQL
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Insert the carriage return character in vim
...en though it's an old question: to insert a literal CR character from a :s command, you must precede it with a backslash or else vim (7.1.314) will convert it to the end of line character appropriate for your fileformat setting. ie enter :s/.../\^V^M/g.
– DerfK
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ViewPager with previous and next page boundaries
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Quoting myself from a blog post on this subject:
The third approach comes from Dave Smith, co-author of the well-regarded book Android Recipes. He went in a very different direction, using a custom container that disabled children clipping to show more than one page at a time.
His published s...
What is an MvcHtmlString and when should I use it?
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I'd add that MVC 2 is compiled against .Net 3.5, not 4. This means that MvcHtmlString doesn't implement IHtmlString because that only exists in 4. The <%: syntax must duck-type - it will always call .ToHtmlString() before .ToString() regardless...
Read/write to Windows registry using Java
... in the java.util.prefs.Preferences class. The internals of this class are complicated, but the class itself is very easy to use.
For example, the following code obtains the exact windows distribution from the registry:
String value = WinRegistry.readString (
WinRegistry.HKEY_LOCAL_MACHINE, ...
How to list branches that contain a given commit?
How can I query git to find out which branches contain a given commit? gitk will usually list the branches, unless there are too many, in which case it just says "many (38)" or something like that. I need to know the full list, or at least whether certain branches contain the commit.
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what's data-reactid attribute in html?
...tribute is a custom attribute used so that React can uniquely identify its components within the DOM.
This is important because React applications can be rendered at the server as well as the client. Internally React builds up a representation of references to the DOM nodes that make up your applic...
How do you receive a url parameter with a spring controller mapping
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How to change the default font size in ggplot2
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