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When use getOne and findOne methods Spring Data JPA
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TL;DR
T findOne(ID id) (name in the old API) / Optional<T> findById(ID id) (name in the new API) relies on EntityManager.find() that performs an entity eager loading.
T getOne(ID id) relies on EntityManager.getReference() that performs an entity lazy loading. So to ensure the effective ...
Adding 'serial' to existing column in Postgres
...LTER TABLE foo ALTER COLUMN a SET NOT NULL;
ALTER SEQUENCE foo_a_seq OWNED BY foo.a; -- 8.2 or later
SELECT MAX(a) FROM foo;
SELECT setval('foo_a_seq', 5); -- replace 5 by SELECT MAX result
INSERT INTO foo (b) VALUES('teste');
INSERT INTO bar (b) VALUES('teste');
SELECT * FROM foo;
SELECT * F...
Why doesn't await on Task.WhenAll throw an AggregateException?
...ceptions and not aggregated exceptions.
-- Edit --
Got it:
An Async Primer by Bill Wagner
Bill Wagner said: (in When Exceptions Happen)
...When you use await, the code generated by the compiler unwraps the
AggregateException and throws the underlying exception. By leveraging
await, you avoid the ex...
What is the 'CLSCompliant' attribute in .NET?
... with the CLSCompliant attribute when you want to make sure it can be used by any other .NET language.
These are the basic rules:
Unsigned types should not be part of the public interface of the class. What this means is public fields should not have unsigned types like uint or ulong, public metho...
Sorting related items in a Django template
...property
def sorted_attendee_set(self):
return self.attendee_set.order_by('last_name')
You could define more of these as you need them...
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In which order should floats be added to get the most precise result?
...since you "discard" fewer bits of precision in the smaller value that way. By sorting the numbers, you group values of similar magnitude together, and by adding them in ascending order you give the small values a "chance" of cumulatively reaching the magnitude of the bigger numbers.
Still, if negat...
SQL JOIN and different types of JOINs
...hey have taken the idea for the pictures. See A visualization of SQL joins by Jeff Atwood (yes, the one who co-authored SO) and the linked article by Ligaya Turmelle where Jeff got the idea and explanded it.
– ypercubeᵀᴹ
Oct 12 '14 at 11:29
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Show all Elasticsearch aggregation results/buckets and not just 10
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0 is working on 2.5.2. what do you mean by 2.x onward? do you mean after version 5? I am also curious what kind of memory issues can it cause if I want to return all possible aggs, what would be the difference between setting 0 (max_value) and 10000(Some big upper ...
Best way to represent a fraction in Java?
...or denominator.
* Denominator will always be positive (so sign is carried by numerator,
* and a zero-denominator is impossible).
*/
public final class BigFraction extends Number implements Comparable<BigFraction>
{
private static final long serialVersionUID = 1L; //because Number is Seria...
What use is find_package() if you need to specify CMAKE_MODULE_PATH anyway?
...e (install)
<package>Config.cmake file located outside and produced by install
command of other project (Foo for example).
foo library:
> cat CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
project(Foo)
add_library(foo Foo.hpp Foo.cpp)
install(FILES Foo.hpp DESTINATION include)
inst...