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doGet and doPost in Servlets
...tter sense.
GET
Usually, HTTP GET requests are idempotent. I.e. you get exactly the same result everytime you execute the request (leaving authorization/authentication and the time-sensitive nature of the page —search results, last news, etc— outside consideration). We can talk about a bookmar...
How do I create a parameterized SQL query? Why Should I?
...
Your EXEC example would NOT be parameterized. You need parameterized queries (prepared statements in some circles) to prevent input like this from causing damage:
';DROP TABLE bar;--
Try putting that in your fuz variable (or...
Grep only the first match and stop
...lem:
grep -o -a -m 1 -h -r "Pulsanti Operietur" /path/to/dir | head -1
explanation of each grep option:
-o, --only-matching, print only the matched part of the line (instead of the entire line)
-a, --text, process a binary file as if it were text
-m 1, --max-count, stop reading a file after 1 ma...
How to find out the number of CPUs using python
...
multiprocessing is also supported in 3.x
– LittleByBlue
Jul 5 '15 at 10:36
3
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When to use generic methods and when to use wild-card?
...with wildcards, you have to use type parameters.
Taking your method as example, suppose you want to ensure that the src and dest list passed to copy() method should be of same parameterized type, you can do it with type parameters like so:
public static <T extends Number> void copy(List<...
Differences between action and actionListener
...ctionListener if you want have a hook before the real business action get executed, e.g. to log it, and/or to set an additional property (by <f:setPropertyActionListener>), and/or to have access to the component which invoked the action (which is available by ActionEvent argument). So, purely ...
Threads vs Processes in Linux
I've recently heard a few people say that in Linux, it is almost always better to use processes instead of threads, since Linux is very efficient in handling processes, and because there are so many problems (such as locking) associated with threads. However, I am suspicious, because it seems like ...
How to prevent http file caching in Apache httpd (MAMP)
... mod_headers.c>
Header unset ETag
Header set Cache-Control "max-age=0, no-cache, no-store, must-revalidate"
Header set Pragma "no-cache"
Header set Expires "Wed, 11 Jan 1984 05:00:00 GMT"
</ifModule>
</filesMatch>
100% Prevent Files from being cached
This is si...
Why does the order in which libraries are linked sometimes cause errors in GCC?
...
(See the history on this answer to get the more elaborate text, but I now think it's easier for the reader to see real command lines).
Common files shared by all below commands
$ cat a.cpp
extern int a;
int main() {
return a;
}
$ cat b.cpp
extern int b;
int a = b;
$ cat d.cpp
...
Importing CSV with line breaks in Excel 2007
I'm working on a feature to export search results to a CSV file to be opened in Excel. One of the fields is a free-text field, which may contain line breaks, commas, quotations, etc. In order to counteract this, I have wrapped the field in double quotes (").
...