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How to run Unix shell script from Java code?
...get("VAR1") + "suffix");
pb.directory(new File("myDir"));
Process p = pb.start();
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How to generate all permutations of a list?
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Starting with Python 2.6 (and if you're on Python 3) you have a standard-library tool for this: itertools.permutations.
import itertools
list(itertools.permutations([1, 2, 3]))
If you're using an older Python (<2.6) f...
How to version control a record in a database
...in the history. If you always need the history then you can put effective start and end dates and keep all the records in FOO itself. Every query then needs to check those dates.
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How can I open a URL in Android's web browser from my application?
...tent = new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.google.com"));
startActivity(browserIntent);
That works fine for me.
As for the missing "http://" I'd just do something like this:
if (!url.startsWith("http://") && !url.startsWith("https://"))
url = "http://" + url;
I woul...
Clear variable in python
...ove them from the globals() object:
for name in dir():
if not name.startswith('_'):
del globals()[name]
This is just an example loop; it defensively only deletes names that do not start with an underscore, making a (not unreasoned) assumption that you only used names without an u...
How to print VARCHAR(MAX) using Print Statement?
...ent isn't strictly necessary. But, without the CDATA section, your method starts having trouble with some strings. Especially those that contain <. If they aren't XML, the query will usually error out. If they are XML, the string may end up reformatted into another "equivalent" XML form.
...
How do I close a single buffer (out of many) in Vim?
...e no mention of any "wipeout". The description of the command (help write) starts with "Write the whole buffer to the current file."
– amn
Oct 13 '16 at 10:44
4
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How to tell if browser/tab is active [duplicate]
...tual Focus or Blur action taken by the user, in which case the client will start doing hard_work on more than one interval, basically simultaneously.
– Jon z
Oct 1 '11 at 13:01
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Why are hexadecimal numbers prefixed with 0x?
...s over the years. Notably in countries like the UK where telephone numbers start with a 0. Javascript and many other languages would parse these as octal, mangling the number before storing. To add to the fun, one popular database product would silently switch back to decimal parsing if the number ...
SQLAlchemy default DateTime
... SQL standard specifies that CURRENT_TIMESTAMP returns values based on the start of the transaction.
PostgreSQL provides the non-SQL-standard statement_timestamp() and clock_timestamp() which do change within a transaction. Docs here: https://www.postgresql.org/docs/current/static/functions-datetime...