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In which case do you use the JPA @JoinTable annotation?
...solution in JPA you need to use the @JoinTable annotation. For example, in order to implement a uni-directional one-to-many association, we can define our entities as such:
Project entity:
@Entity
public class Project {
@Id
@GeneratedValue
private Long pid;
private String name;
...
Python dictionary: Get list of values for list of keys
...avoids constructing an intermediary list, but you still run 'k in mykeys' (order len(mykeys), since it's a list) for every k in mydict. Completely unnecessarily, compared to the simpler list comprehension that just runs over mykeys.
– Peter DeGlopper
Aug 26 '1...
What are important languages to learn to understand different approaches and concepts? [closed]
When all you have is a pair of bolt cutters and a bottle of vodka, everything looks like the lock on the door of Wolf Blitzer's boathouse. (Replace that with a hammer and a nail if you don't read xkcd)
...
How to move a model between two Django apps (Django 1.7)
..., from an SQL point of view you can apply the trick of this answer. But in order to achieve this only via Django, one approach I can think of would be along the lines of @ozan answer, except the first step would be to duplicate the tables involved in MTM relationship (one version of the dupes in eac...
Is there a setting on Google Analytics to suppress use of cookies for users who have not yet given c
... asking whether you are willing to accept them, 2) it must set a cookie in order to save your cookie preferences, and 3) it states that the site will not control 3rd party cookies, which is in direct violation of the spirit if not the letter of the EU directive. I suspect that the Beebs will get sm...
Delete/Reset all entries in Core Data?
...p;error]) {
// do something with the error
}
}
Note that in order to call self.persistentStoreCoordinator I declared a property in the Home View Controller. (Don't worry about the managedObjectContext that I use for saving and loading.)
@property (nonatomic, retain) NSManagedObjectCo...
Is there a TRY CATCH command in Bash
... set the -e flag). Programming languages which offer try/catch do this in order to inhibit a "bailing out" because of this special situation (hence typically called
How to mark a build unstable in Jenkins when running shell scripts
...ute different tasks. Some are sh/bash scripts that run rsync, and some are PHP scripts. One of the PHP scripts is running some integration tests that output to JUnit XML, code coverage reports, and similar.
...
What tools are there for functional programming in C?
...unctions, any program (even if all its functions are 'pure') will be lower-order (in the information theory sense) than its equivalent with first-class functions. In my view, it is this declarative style only possible with first-class functions that is the main benefit of FP. I think you be doing so...
How to use timeit module
...sort really shine because it performs best when the data already partially ordered).
Here is an example of how to set up a test for sorting:
>>> import timeit
>>> setup = '''
import random
random.seed('slartibartfast')
s = [random.random() for i in range(1000)]
timsort = list.s...