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how to emulate “insert ignore” and “on duplicate key update” (sql merge) with postgresql?
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Magnus meant that you use a query like this: "start transaction; create temporary table temporary_table as select * from test where false; copy temporary_table from 'data_file.csv'; lock table test; update test set data=temporary_table.data from temporary_table where tes...
How to check for an active Internet connection on iOS or macOS?
...reachable = { _ in
print("Not reachable")
}
do {
try reachability.startNotifier()
} catch {
print("Unable to start notifier")
}
Objective-C
1) Add SystemConfiguration framework to the project but don't worry about including it anywhere
2) Add Tony Million's version of Reachability...
Java: Calling a super method which calls an overridden method
...uper. Every time it calls a method, it will look at the instance type, and start searching for the method with this type, no matter how often you called super. So when you call method2 on an instance of SubClass, it will always see the one from SubClass first.
– Aaron Digulla
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Large Numbers in Java
... args.length > 0 ? Integer.parseInt(args[0]) : 250 * 1000;
long start = System.nanoTime();
BigInteger fibNumber = fib(place);
long time = System.nanoTime() - start;
System.out.println(place + "th fib # is: " + fibNumber);
System.out.printf("Time to compute...
Multiple HttpPost method in Web API controller
I am starting to use MVC4 Web API project, I have controller with multiple HttpPost methods. The Controller looks like the following:
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“Keep Me Logged In” - the best approach
...e hash and current session_ID because the session_ID changes every session_start(); just thought i'd point this out.
– Partack
Aug 3 '11 at 2:01
3
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Installing PDO driver on MySQL Linux server
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It's worth mentioning that you need to restart apache afterwards for the changes to apply.
– Adam F
Nov 23 '15 at 23:15
1
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How to open files relative to home directory
...e process unless dir_string is given, in which case it will be used as the starting point. If the given pathname starts with a “~” it is NOT expanded, it is treated as a normal directory name.
share
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Redefine tab as 4 spaces
.../.vimrc
Then, paste the configuration below into the file. Once vim is restarted, the tab settings will apply.
set tabstop=4 " The width of a TAB is set to 4.
" Still it is a \t. It is just that
" Vim will interpret it to be having
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How to pick an image from gallery (SD Card) for my app?
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private static final int SELECT_PHOTO = 100;
Start intent
Intent photoPickerIntent = new Intent(Intent.ACTION_PICK);
photoPickerIntent.setType("image/*");
startActivityForResult(photoPickerIntent, SELECT_PHOTO);
Process result
@Override
protected void onActivity...