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What is a StackOverflowError?
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Parameters and local variables are allocated on the stack (with reference types, the object lives on the heap and a variable in the stack references that object on the heap). The stack typically lives at the upper end of your address space and as it is used up...
Passing enum or object through an intent (the best solution)
...This is an old question, but everybody fails to mention that Enums are actually Serializable and therefore can perfectly be added to an Intent as an extra. Like this:
public enum AwesomeEnum {
SOMETHING, OTHER;
}
intent.putExtra("AwesomeEnum", AwesomeEnum.SOMETHING);
AwesomeEnum result = (Aweso...
Adding a new SQL column with a default value
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Try this:
ALTER TABLE table1 ADD COLUMN foo INT DEFAULT 0;
From the documentation that you linked to:
ALTER [ONLINE | OFFLINE] [IGNORE] TABLE tbl_name
alter_specification [, alter_specification] ...
alter_specification:
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ADD [COLUMN] (col_name c...
Fully backup a git repo?
Is there a simple way to backup an entire git repo including all branches and tags?
13 Answers
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Require either of two arguments using argparse
...exclusion (at least for the second part of your question).
This way, only foo or bar will be accepted, not both.
import argparse
parser = argparse.ArgumentParser()
group = parser.add_mutually_exclusive_group(required=True)
group.add_argument('--foo',action=.....)
group.add_ar...
Hg: How to do a rebase like git's rebase
...er mq nor rebase are enabled by default in mercurial: because mercurial is all about indelible changesets. When I work in the manner you're describing, which is nearly daily, here's the pattern I take:
1. Start working on a new feature:
$ hg clone mainline-repo newfeature-123
do a few commits (M, ...
Save PL/pgSQL output from PostgreSQL to a CSV file
...e to your local PC. It also needs to be run as a Postgres "superuser" (normally called "root") because Postgres can't stop it doing nasty things with that machine's local filesystem.
That doesn't actually mean you have to be connected as a superuser (automating that would be a security risk of a di...
What is the difference between Gemfile and Gemfile.lock in Ruby on Rails
...emfile.lock file is where Bundler records the exact versions that were installed. This way, when the same library/project is loaded on another machine, running bundle install will look at the Gemfile.lock and install the exact same versions, rather than just using the Gemfile and installing the most...
Runnable with a parameter?
...ble that accepts a parameter" although I know that such runnable doesn't really exist.
7 Answers
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How do I get the n-th level parent of an element in jQuery?
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Read further down the answer and all shall be revealed! (I've given you level examples)
– Henry
Aug 17 '11 at 13:37
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