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Choose between ExecutorService's submit and ExecutorService's execute
...stom handler has been installed.
On the other hand, a Throwable generated by a task queued with submit() will bind the Throwable to the Future that was produced from the call to submit(). Calling get() on that Future will throw an ExecutionException with the original Throwable as its cause (accessi...
How can I prevent SQL injection in PHP?
...arameterized queries. These are SQL statements that are sent to and parsed by the database server separately from any parameters. This way it is impossible for an attacker to inject malicious SQL.
You basically have two options to achieve this:
Using PDO (for any supported database driver):
$stm...
How do you check whether a number is divisible by another number (Python)?
...multiple of 5. The way I thought I'd do this would be to divide the number by 3, and if the result is an integer then it would be a multiple of 3. Same with 5.
...
Multiple Indexes vs Multi-Column Indexes
...arch a table on three columns
state, county, zip.
you sometimes search by state only.
you sometimes search by state and county.
you frequently search by state, county, zip.
Then an index with state, county, zip. will be used in all three of these searches.
If you search by zip alone quite a...
Git and Mercurial - Compare and Contrast
... .hg/localtags; in Git tags are refs residing in refs/tags/ namespace, and by default are autofollowed on fetching and require explicit pushing.
Branches: In Mercurial basic workflow is based on anonymous heads; Git uses lightweight named branches, and has special kind of branches (remote-tracking b...
Filter by property
Is it possible to filter a Django queryset by model property?
8 Answers
8
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How to compare objects by multiple fields
...ssume you have some objects which have several fields they can be compared by:
22 Answers
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Debugging App When Launched by Push Notification
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In XCode < 4.0 (for XCode >= 4, see answer by delirus below), you can now configure Xcode to attach the debugger to the app after you launch it, instead of launching the app through the debugger. This lets you debug things that vary based on the launch state of your a...
How do I find duplicates across multiple columns?
...s
join (
select name, city, count(*) as qty
from [stuff]
group by name, city
having count(*) > 1
) t on s.name = t.name and s.city = t.city
share
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improve this answer
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How does the Brainfuck Hello World actually work?
... understand Brainfuck you must imagine infinite array of cells initialized by 0 each.
...[0][0][0][0][0]...
When brainfuck program starts, it points to any cell.
...[0][0][*0*][0][0]...
If you move pointer right > you are moving pointer from cell X to cell X+1
...[0][0][0][*0*][0]...
If ...