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Database Structure for Tree Data Structure
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Have a look at Managing Hierarchical Data in MySQL. It discusses two approaches for storing and managing hierarchical (tree-like) data in a relational database.
The first approach is the adjacency list model, which is what you essentially describe: having a...
How to amend a commit without changing commit message (reusing the previous one)?
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Since git 1.7.9 version you can also use git commit --amend --no-edit to get your result.
Note that this will not include metadata from the other commit such as the timestamp which may or may not be important to you.
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IntelliJ beginning of file keyboard shortcut
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That's weird, why can't Command+Up work, like in literally every other text editing application?
– Trejkaz
Oct 18 '17 at 0:28
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Rails migration for has_and_belongs_to_many join table
...acher_id:integer
(note the table name lists both join tables in alphabetical order)
and then for rails 3 and below only, you need to edit your generated migration so an id field is not created:
create_table :students_teachers, :id => false do |t|
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Turning a Comma Separated string into individual rows
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You can use the wonderful recursive functions from SQL Server:
Sample table:
CREATE TABLE Testdata
(
SomeID INT,
OtherID INT,
String VARCHAR(MAX)
)
INSERT Testdata SELECT 1, 9, '18,20,22'
INSERT Testdata SELECT ...
MongoDB/Mongoose querying at a specific date?
...tomorrow = today.add(1, 'days') does not work since it also mutates today. Calling moment(today) solves that problem by implicitly cloning today.
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npm windows install globally results in npm ERR! extraneous
...installed globally, it's going to give you a lot of extraneous errors that can be simply ignored because most things installed globally will not be in your project's package.json.
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Python set to list
How can I convert a set to a list in Python? Using
7 Answers
7
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What is Model in ModelAndView from Spring MVC?
... new ModelAndView("welcomePage","model",bean);
... then in your jsp, you can do:-
Hello ${model.name}! {model.message} // displays Hello Mike! Meow!
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C# member variable initialization; best practice?
...ers happen before any "base"/"this" constructor.
The constructor approach can be used with auto-implemented properties (field initializers cannot) - i.e.
[DefaultValue("")]
public string Foo {get;set;}
public Bar() { // ctor
Foo = "";
}
Other than that, I tend to prefer the field initializer s...