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Difference between one-to-many and many-to-one relationship
... is : both are similar,
Answer to your second question is: one-to-many --> a MAN(MAN table) may have more than one wife(WOMEN table) many-to-one --> more than one women have married one MAN.
Now if you want to relate this relation with two tables MAN and WOMEN, one MAN table row may have man...
In Hibernate Validator 4.1+, what is the difference between @NotNull, @NotEmpty, and @NotBlank?
...y: The CharSequence, Collection, Map or Array object is not null and size > 0.
@NotBlank: The string is not null and the trimmed length is greater than zero.
To help you understand, let's look into how these constraints are defined and carried out (I'm using version 4.1):
The @NotNull const...
What are Unwind segues for and how do you use them?
... {
self.textLabel.text = "Came from B = B->A , B exited"
}
}
}
Unwind Seague Source View Controller ( You Need to connect Exit Button to VC’s exit icon and connect it to unwindseague:
Unwin...
How to add a border just on the top side of a UIView
... inset: CGFloat = 0.0,
thickness: CGFloat = 1.0) -> [UIView] {
var borders = [UIView]()
@discardableResult
func addBorder(formats: String...) -> UIView {
let border = UIView(frame: .zero)
border.backgroundColor = color
border.transl...
How to create a new (and empty!) “root” branch?
... some value which is a valid pointer.
Test:
git switch master
echo foo >foo.txt
git switch --discard-changes --orphan new-orphan2
git ls-files >tracked-files
# test_must_be_empty tracked-files
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Accidentally committed .idea directory files into git
...mote(s).
Summary
The full process would look like this:
$ echo '.idea' >> .gitignore
$ git rm -r --cached .idea
$ git add .gitignore
$ git commit -m '(some message stating you added .idea to ignored entries)'
$ git push
(optionally you can replace last line with git push some_remote, wher...
Rails where condition using NOT NIL
...ds where.not so you can do this:
Foo.includes(:bar).where.not('bars.id' => nil)
Foo.includes(:bar).where.not(bars: { id: nil })
When working with scopes between tables, I prefer to leverage merge so that I can use existing scopes more easily.
Foo.includes(:bar).merge(Bar.where.not(id: nil))
...
Switch case with fallthrough?
...or you can use [5,7,8] for non continuous values.
#!/bin/bash
while [ $# -gt 0 ];
do
case $1 in
1)
echo "one"
;;
[2-3])
echo "two or three"
;;
[4-6])
echo "four to six"
;;
[7,9])
echo "seven or nine"
;;
*)
...
Android Studio/Intellij Idea: “Table of Contents” for a class
...
View > Tool Windows > Structure
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Red black tree over avl tree
...vl tree is that for "n" elements you need atleast log2(log2(n))...(height->log2(n)) bits to store the height of the tree!
So when you are handling enormous data you cannot be sure of how many bits to allot for storing height at each node.
For instance if you use 4 bytes int (32 bits) for storing...