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MySQL Conditional Insert
...t have dual already, you need to create it. CREATE TABLE dual ( dummy CHAR(1) DEFAULT 'x' NOT NULL CHECK (dummy = 'x') PRIMARY KEY ); INSERT INTO dual VALUES('x'); REVOKE ALL ON dual FROM PUBLIC; GRANT SELECT ON dual TO PUBLIC;
– Jonathan Leffler
Feb 24 '...
How to attach javadoc or sources to jars in libs folder?
...f you are only going to link the Javadoc and not the source code, I had to extract the Javadoc jar with 7zip to a folder in My Documents, then have the properties file point to the folder with the Javadoc index.html directly like so doc=C:\\Users\\johny\\workspacenewfb\\robotium-solo-4.0-javadoc
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When to use a Content Provider
... if you don't intend to make it public.
It's good practice to provide the extra level of abstraction over your data to make it easier to change internally. What if you decide to change the underlying database structure at a later time? If you use a ContentProvider you can contain all the structur...
Jump to function definition in vim
...ns in the background and analyses your whole project in real time exposing extra capabilities to your editor (any editor, not only vim). You get things like:
namespace aware tag completion
jump to definition
jump to next / previous error
find all references to an object
find all interface implemen...
Comma in C/C++ macro
...in most contexts.
A nice trick to workaround this is that in C++, you can extract a typename from a parenthesized type name using a function type:
template<typename T> struct argument_type;
template<typename T, typename U> struct argument_type<T(U)> { typedef U type; };
#define F...
What is a vertical tab?
What was the original historical use of the vertical tab character ( \v in the C language, ASCII 11)?
10 Answers
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Normalize data in pandas
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If your dataframe has strings in some columns, see this answer
– netskink
Jul 22 '18 at 0:21
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SQL: deleting tables with prefix
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Note to self.Increase num of max char: SET SESSION group_concat_max_len = 999999999;
– Mohammed Joraid
Apr 12 '15 at 0:59
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Rearrange columns using cut
...areful to quote the values "$col2" and "$col1" -- there could be shell metacharacters or other shenanigans in the data.
– tripleee
Mar 29 '17 at 5:08
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Can I use mstest.exe without installing Visual Studio?
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@Russell - Personally I'd either shell out for an extra VS license, or just use NUnit instead.
– Justin
Aug 4 '10 at 6:34
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