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What is the most efficient/elegant way to parse a flat table into a tree?
... MySQL 8.0 supports recursive queries, we can say that all popular SQL databases support recursive queries in standard syntax.
WITH RECURSIVE MyTree AS (
SELECT * FROM MyTable WHERE ParentId IS NULL
UNION ALL
SELECT m.* FROM MyTABLE AS m JOIN MyTree AS t ON m.ParentId = t.Id
)
SELECT * ...
Maximum single-sell profit
....
#
# Let's consider the time and space complexity of this algorithm. Our base
# case takes O(1) time, and in our recursive step we make two recursive calls,
# one on each half of the array, and then does O(n) work to scan the array
# elements to find the minimum and maximum values. This gives the...
Convert JavaScript string in dot notation into an object reference
... or not. Let's assume not. Then a valid expression is a concatenation of a base identifier plus some .identifiers plus some ["stringindex"]s
This would then be equivalent to a["b"][4]["c"]["d"][1][2][3], though we should probably also support a.b["c\"validjsstringliteral"][3]. You'd have to check t...
What is the usefulness of PUT and DELETE HTTP request methods?
...me URI, /blog/article/1, the only difference is the HTTP Request verb. And based on that verb your router can call different actionController. This enables you to build neat URL-s.
Read this two articles, they might help you:
Symfony 2 - HTTP Fundamentals
Symfony 2 - Routing
These articles are a...
How exactly does CMake work?
...t in charge of managing a large cross-platform build system, and your code base is a few KLOC, maybe up to 100KLOG, using CMake seems a little bit like using a 100,000 dollar forestry tree removal machine to remove weeds from your 2 foot by 2 foot flower garden. (By the way, if you've never seen su...
What's the purpose of using braces (i.e. {}) for a single-line if or loop?
... get in the way of my non-linear workflow, trying to correct my 'mistakes' based on incomplete information. IDEs aren't very good at auto-indenting every programmer's natural flow. Those programmers who use such features tend to merge their style to their IDE, which is fine if you only use one IDE b...
How do search engines deal with AngularJS applications?
... it would make sense to use routing. Because Github static pages is file based, you would need an actual html file backing each URL in this instance. There is no rule that a website has to be file based though, and if you use an alternative platform you can serve the same template for multiple URL...
Places where JavaBeans are used?
...te a list of users wherein you store the data of the user table in the database:
List<User> users = new ArrayList<User>();
while (resultSet.next()) {
User user = new User();
user.setId(resultSet.getLong("id"));
user.setName(resultSet.getString("name"));
user.setBirthdate(...
Logging levels - Logback - rule-of-thumb to assign log levels
... here. Significant boundary events should be considered as well (e.g. database calls, remote API calls). Typical business exceptions can go here (e.g. login failed due to bad credentials). Any other event you think you'll need to see in production at high volume goes here.
debug: just about everyt...
What does an exclamation mark mean in the Swift language?
...!] circumstances") or standard non-optional ("is never nil") declarations, based on the exact behaviour of their Objective-C code.
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