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Specifying an Index (Non-Unique Key) Using JPA
...u like living on the edge, you can get the latest snapshot for eclipselink from their maven repository (groupId:org.eclipse.persistence, artifactId:eclipselink, version:2.5.0-SNAPSHOT). For just the JPA annotations (which should work with any provider once they support 2.1) use artifactID:javax.pers...
What are database normal forms and can you give examples? [closed]
...self. A casual user should be able to read your answer and get some value from it without having to click the blog link. The answer should be self-contained, in other words.
– Robert Harvey
Oct 22 '12 at 23:03
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Unable to create/open lock file: /data/mongod.lock errno:13 Permission denied
...issue, the actual reason was that there was mongod session running already from my previous attempt.
I ran
killall mongod
and everything else ran just as expected.
killall command would send a TERM signal to all processes with a real UID. So this kills all the running instances of mongod so t...
Search all the occurrences of a string in the entire project in Android Studio
...arch in project, files, classes, settings, and so on.
Also you can search from Project Structure dialog with "Find in Path…". Just call it by right mouse button on concrete directory and the search will be scoped, only inside that directory and it's sub-directory.
Enjoy!
...
Comma separator for numbers in R?
... if you have a vector this can go awry if the numebrs are quite different. From help "Numeric vectors are encoded with the minimum number of decimal places needed to display all the elements to at least the digits significant digits. However, if all the elements then have trailing zeroes, the number...
How to change text transparency in HTML/CSS?
...e: 16pt;
font-family: Arial, sans-serif;
}
Also, steer far, far away from <font>. We have CSS for that now.
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Is it a bad practice to use break in a for loop? [closed]
...
Far from bad practice, Python (and other languages?) extended the for loop structure so part of it will only be executed if the loop doesn't break.
for n in range(5):
for m in range(3):
if m >= n:
prin...
How do you underline a text in Android XML?
... </string>
</resources>
If you want to underline something from code use:
TextView tv = (TextView) view.findViewById(R.id.tv);
SpannableString content = new SpannableString("Content");
content.setSpan(new UnderlineSpan(), 0, content.length(), 0);
tv.setText(content);
Hope this hel...
How many characters can UTF-8 encode?
...ially coded by UTF-8.
This number is 2^7 + 2^11 + 2^16 + 2^21 which comes from the way the encoding works:
1-byte chars have 7 bits for encoding
0xxxxxxx (0x00-0x7F)
2-byte chars have 11 bits for encoding
110xxxxx 10xxxxxx (0xC0-0xDF for the first byte; 0x80-0xBF for the second)
3-byte chars have...
How to throw std::exceptions with variable messages?
...
The standard exceptions can be constructed from a std::string:
#include <stdexcept>
char const * configfile = "hardcode.cfg";
std::string const anotherfile = get_file();
throw std::runtime_error(std::string("Failed: ") + configfile);
throw std::runtime_error(...