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How to reliably open a file in the same directory as a Python script
...ath(
os.path.join(os.getcwd(), os.path.dirname(__file__)))
The join() call prepends the current working directory, but the documentation says that if some path is absolute, all other paths left of it are dropped. Therefore, getcwd() is dropped when dirname(__file__) returns an absolute path.
Al...
Select first row in each GROUP BY group?
... Firebird 3.0+, Teradata, Sybase, Vertica:
WITH summary AS (
SELECT p.id,
p.customer,
p.total,
ROW_NUMBER() OVER(PARTITION BY p.customer
ORDER BY p.total DESC) AS rk
FROM PURCHASES p)
SELECT s.*
FROM summary s
WHERE ...
How do API Keys and Secret Keys work? Would it be secure if I have to pass my API and secret keys to
...
Basically elaborating on what's outlined here.
Here's how it works: let's say we have a function that takes a number from zero through nine, adds three and, if the result is greater than ten, subtracts ten. So f(2) = 5, f(8) = 1...
What is the difference between trie and radix trie data structures?
...
@Trying Algorithmically Radix is faster than TRIE, that's why its worth doing the compression. Fewer nodes to load and less space are generally better. That said, implementation quality can vary.
– Glenn Teitelbaum
...
How to make Entity Framework Data Context Readonly
... public override int SaveChanges()
{
// Throw if they try to call this
throw new InvalidOperationException("This context is read-only.");
}
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
// Need this since there is no DbSet<Custom...
How to return raw string with ApiController?
...
I call the following webapi2 controller method from an mvc controller method:
<HttpPost>
Public Function TestApiCall(<FromBody> screenerRequest As JsonBaseContainer) As IHttpActionResult
Dim response = Me.Reque...
How to fight tons of unresolved variables warning in Webstorm?
...don't get data as a parameter? You don't have JSDoc then:
function niceApiCall(parameters) {
const result = await ... // HTTP call to the API here
for (const e of result.entries) {
.. // decorate each entry in the result
}
return result;
}
WebStorm will warn that "result.entries" is ...
Oracle “(+)” Operator
...89 format (using a comma in the FROM clause to separate table references) didn't standardize OUTER joins.
The query would be re-written in ANSI-92 syntax as:
SELECT ...
FROM a
LEFT JOIN b ON b.id = a.id
This link is pretty good at explaining the difference between JOINs.
It should als...
Get ID of last inserted document in a mongoDB w/ Java driver
Is there an easy way to get the ID (ObjectID) of the last inserted document of a mongoDB instance using the Java driver?
8 ...
Is there a pattern for initializing objects created via a DI container
...ethod are generally thought to be bad design, as you need to "remember" to call them and make sure they don't open up too much of your implementation's state (i.e. what is to stop someone from re-calling initialize or the setter?).
...