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Map enum in JPA with fixed values?
...nverter.
Create an enumerated class like so:
public enum NodeType {
ROOT("root-node"),
BRANCH("branch-node"),
LEAF("leaf-node");
private final String code;
private NodeType(String code) {
this.code = code;
}
public String getCode() {
return code;
...
How do I move a file with Ruby?
...
you can move your file like this
Rails.root.join('foo','bar')
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Finding the number of days between two dates
...also hour-minute-second; same happpens with DATE type in databases such as MySQL), the widely used formula
(unix_timestamp(DATE2) - unix_timestamp(DATE1)) / 86400
or
floor(time() - strtotime($somedate)) / 86400
will return, say, 17 when DATE1 and DATE2 are in the same DST segment of the year...
How to programmatically create and read WEP/EAP WiFi configurations in Android?
... BufferedWriter out = null;
try
{
File root = Environment.getExternalStorageDirectory();
Toast toast = Toast.makeText(this, "SD CARD mounted and writable? " + root.canWrite(), 5000);
toast.show();
if (root.canWrite())
...
When to use reinterpret_cast?
...ions to (IEEE 754) floats. One example of this was the Fast Inverse Square-Root trick:
https://en.wikipedia.org/wiki/Fast_inverse_square_root#Overview_of_the_code
It treats the binary representation of the float as an integer, shifts it right and subtracts it from a constant, thereby halving and n...
When to use inline function and when not to use it?
... most important rule of optimization is that premature optimization is the root of all evil. Always write clear code (using efficient algorithms), then profile your program and only optimize functions that are taking too long.
If you find a particular function is very short and simple, and it's ge...
Would you, at present date, use JBoss or Glassfish (or another) as Java EE server for a new project?
...ed a new site on a complete Sun open source stack (OpenSolaris, GlassFish, MySQL) and it was a great experience with only minor frustrations.
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Setting log level of message at runtime in slf4j
...
Try switching to Logback and use
ch.qos.logback.classic.Logger rootLogger = (ch.qos.logback.classic.Logger)LoggerFactory.getLogger(ch.qos.logback.classic.Logger.ROOT_LOGGER_NAME);
rootLogger.setLevel(Level.toLevel("info"));
I believe this will be the only call to Logback and the rest o...
Execute a terminal command from a Cocoa app
...n use this method like this:
NSString *output = runCommand(@"ps -A | grep mysql");
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Why does the order in which libraries are linked sometimes cause errors in GCC?
...llowing scenario:
myprog.o - containing main() function, dependent on libmysqlclient
libmysqlclient - static, for the sake of the example (you'd prefer the shared library, of course, as the libmysqlclient is huge); in /usr/local/lib; and dependent on stuff from libz
libz (dynamic)
How do we link...