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Best explanation for languages without null
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I think the succinct summary of why null is undesirable is that meaningless states should not be representable.
Suppose I'm modeling a door. It can be in one of three states: open, shut but unlocked, and shut and locked. Now I could model it along the lines of
class Door
private boo...
Insert current date in datetime format mySQL
I'm having problems getting the date inserted properly into my database.
15 Answers
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WebSockets protocol vs HTTP
...losed. The request methods (GET, POST, HEAD) have specific transactional meaning for resources on the server.
HTTP 1.1: maintains the request-response nature of HTTP 1.0, but allows the connection to stay open for multiple full requests/full responses (one response per request). Still has full heade...
Why do people use __(double underscore) so much in C++
I was having a look through some open source C++ code and notice a lot of double under scores where used in the code, mainly at the start of variable names.
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For each row return the column name of the largest value
I have a roster of employees, and I need to know at what department they are in most often. It is trivial to tabulate employee ID against department name, but it is trickier to return the department name, rather than the number of roster counts, from the frequency table. A simple example below (colu...
How do CDI and EJB compare? interact?
...dvanced feature called portable extensions, which is a kind of plug-in mechanism for vendors to provide extra functionality to Java EE that can be made available on all implementations (Glassfish, JBoss AS, Websphere, etc).
EJB3 beans were retrofitted from the old legacy EJB2 component model* and w...
How do you input commandline argument in IntelliJ IDEA?
When I input commandline arguments,
In Eclipse, using with run configuration. But I don't Know How do i input commandline arguments in IntelliJ IDEA.
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How should I escape commas and speech marks in CSV files so they work in Excel?
I'm generating a CSV file (delimited by commas rather than tabs). My users will most likely open the CSV file in Excel by double clicking it. My data may contain commas and speech marks, so I'm escaping those as follows.
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Best practice for partial updates in a RESTful service
...aside from some people equating the HTTP methods with CRUD. REST is about manipulating resource state by transferring representations. Whatever it is you want to achieve you do by transferring a representation to a resource with the appropriate semantics. Beware of the terms 'pure method calls' or '...
How to destroy an object?
...nd you cannot force to run the garbage collector.
– Daniel
Dec 20 '19 at 14:52
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