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JPA: How to have one-to-many relation of the same Entity type
...ip is the same. The general case is detailed in Section 2.10.2 of the JPA 2.0 spec.
Here's a worked example. First, the entity class A:
@Entity
public class A implements Serializable {
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
private Long id;
@ManyToOne
private A pa...
Flask-SQLAlchemy how to delete all rows in a single table
... Sep 17 '19 at 18:25
Ilja Everilä
36.6k55 gold badges7272 silver badges8686 bronze badges
answered May 15 '13 at 19:55
...
How do I use $scope.$watch and $scope.$apply in AngularJS?
... Using this.myVar puts myVar on the scope.
– Marcus Rådell
Oct 3 '14 at 12:15
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show 2 more comments
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Simple way to encode a string according to a password?
...re cipher. It is one of the strongest of the simple ancient ciphers.
Vigenère cipher
It's quick and easy to implement. Something like:
import base64
def encode(key, string):
encoded_chars = []
for i in xrange(len(string)):
key_c = key[i % len(key)]
encoded_c = chr(ord(st...
What are the new documentation commands available in Xcode 5? [closed]
...
Swift 2.0 uses the following syntax:
/**
Squares a number.
- parameter parameterName: number The number to square.
- returns: The number squared.
*/
Notice how @param is now - parameter.
You can al...
RESTful on Play! framework
...tUser method based on the Accept header?
– Timo Westkämper
Dec 7 '10 at 21:19
it is, but not entirely reliable. If pl...
HTML Submit-button: Different value / button-text?
...re suggestion in comments:
<input type="submit" name="add_tag" value="Lägg till tag" />
In your server side, you'll do something like:
if (request.getParameter("add_tag") != null)
tags.addTag( /*...*/ );
(Since I don't know that language (java?), there may be syntax errors.)
I woul...
Location Manager Error : (KCLErrorDomain error 0)
...was unable to obtain a
location value right now.Available in
iPhone OS 2.0 and later. Declared in
CLError.h.
kCLErrorDenied Access to the location
service was denied by the user.
Available in iPhone OS 2.0 and later.
Declared in CLError.h.
kCLErrorNetwork The network was
unav...
Is there a MySQL option/feature to track history of changes to records?
...in a MySQL database. So when a field has been changed, the old vs new is available and the date this took place. Is there a feature or common technique to do this?
...
How do I make UILabel display outlined text?
....foregroundColor : UIColor.white,
NSAttributedStringKey.strokeWidth : -2.0,
]
myLabel.attributedText = NSAttributedString(string: "Foo", attributes: strokeTextAttributes)
Swift 4.2:
let strokeTextAttributes: [NSAttributedString.Key : Any] = [
.strokeColor : UIColor.black,
.foregr...