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Why historically do people use 255 not 256 for database field magnitudes?
... often see database fields set to have a magnitude of 255 characters, what is the traditional / historic reason why? I assume it's something to do with paging / memory limits, and performance but the distinction between 255 and 256 has always confused me.
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Most simple but complete CMake example
...works. Every time I think that I am getting closer to understand how CMake is meant to be written, it vanishes in the next example I read. All I want to know is, how should I structure my project, so that my CMake requires the least amount of maintainance in the future. For example, I don't want to ...
How to provide user name and password when connecting to a network share
...maintain multiple credentials for different locations. I wrap it into an IDisposable and call WNetCancelConnection2 to remove the creds afterwards (avoiding the multiple usernames error):
using (new NetworkConnection(@"\\server\read", readCredentials))
using (new NetworkConnection(@"\\server2\write...
Maven is not working in Java 8 when Javadoc tags are incomplete
...cal repository projects that have incomplete Javadoc tags (for example, a missing parameter).
17 Answers
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NoSQL (MongoDB) vs Lucene (or Solr) as your database
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This is a great question, something I have pondered over quite a bit. I will summarize my lessons learned:
You can easily use Lucene/Solr in lieu of MongoDB for pretty much all situations, but not vice versa. Grant Ingersoll'...
“where 1=1” statement [duplicate]
...n you add and value = "Toyota" you don't have to worry about whether there is a condition before or just WHERE. The optimiser should ignore it
No magic, just practical
Example Code:
commandText = "select * from car_table where 1=1";
if (modelYear <> 0) commandText += " and year="+mod...
call a static method inside a class?
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edited Oct 30 '13 at 1:40
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Can I specify multiple users for myself in .gitconfig?
In my ~/.gitconfig , I list my personal email address under [user] , since that's what I want to use for Github repos.
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Why should I care that Java doesn't have reified generics?
This came up as a question I asked in an interview recently as something the candidate wished to see added to the Java language. It's commonly-identified as a pain that Java doesn't have reified generics but, when pushed, the candidate couldn't actually tell me the sort of things that he could hav...
Best way to serialize an NSData into a hexadeximal string
...ocoa way to serialize an NSData object into a hexadecimal string. The idea is to serialize the deviceToken used for notification before sending it to my server.
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