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Are there disadvantages to using a generic varchar(255) for all text-based fields?
...d VARCHAR column.
When your query implicitly generates a temporary table, for instance while sorting or GROUP BY, this can use a lot of memory. If you use a lot of VARCHAR(255) fields for data that doesn't need to be that long, this can make the temporary table very large.
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Is there a replacement for unistd.h for Windows (Visual C)?
I'm porting a relatively simple console program written for Unix to the Windows platform ( Visual C++ 8.0 ). All the source files include "unistd.h", which doesn't exist. Removing it, I get complaints about misssing prototypes for 'srandom', 'random', and 'getopt'.
I know I can replace the random f...
JdbcTemplate queryForInt/Long is deprecated in Spring 3.2.2. What should it be replaced by?
The queryforInt/queryforLong methods in JdbcTemplate are deprecated in Spring 3.2. I can't find out why or what is considered the best practice to replace existing code using these methods.
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Fastest Way to Serve a File Using PHP
... configured with
"allow-x-send-file" => "enable"
The documentation for the feature is on the lighttpd wiki they document the X-LIGHTTPD-send-file header but the X-Sendfile name also work
Nginx
On Nginx you can't use the X-Sendfile header you must use their own header that is named X-Accel-...
Mock vs MagicMock
... that automatically does "magic methods" thus seamlessly providing support for lists, iterations and so on... Then what is the reason for plain Mock existing? Isn't that just a stripped down version of MagicMock that can be practically ignored? Does Mock class know any tricks that are not avai...
Git branch diverged after rebase
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When you rebase a branch, you have to rewrite the commits for any commit which is above the commits in the branch onto which you are rebasing. This is because one of the properties of a commit is its parent (or parents). When you rebase, you're changing the parent of the oldest loca...
NHibernate ISession Flush: Where and when to use it, and why?
...r never flush unless Flush() is called explicitly. The last mode is useful for long running units of work, where an ISession is kept open and disconnected for a long time.
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Also refer to this section:
Ending a session involves four distinct phases:
flush the session
commit the transaction
clos...
Cluster analysis in R: determine the optimal number of clusters
... subset of below data, how many clusters will be appropriate? How can I perform cluster dendro analysis?
7 Answers
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Storing Image Data for offline web application (client-side storage database)
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Results Offline blob cache for PNG slippy maps
Testing
171 PNG files (total of 3.2MB)
Platforms tested: Chrome v24, FireFox 18, IE 10
Should also work with Chrome & FF for Android
Fetch from web server
using XHR2 (supported on almost all bro...
How do I append text to a file?
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@Sandra - Did not use !! before, awesome. So often I do stuff like cat /var/log/apache/error.log and get permission denied. This could also be done with an id from the history e.g sudo !1419, this will execute the command at line 1419 in the history as...