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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...
When use getOne and findOne methods Spring Data JPA
...
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 ...
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 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...
Can't seem to discard changes in Git
...s.
core.safecrlf
If true, makes git check if converting CRLF as controlled by
core.autocrlf is reversible. Git will
verify if a command modifies a file in
the work tree either directly or
indirectly. For example, committing a
file followed by checking out the same
file should yield the original file...
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...
Why use pointers? [closed]
...x datatypes such as a string. There are also no way of passing a variable "by reference" to a function. That's where you have to use pointers. Also you can have them to point at virtually anything, linked lists, members of structs and so on. But let's not go into that here.
How do you use pointers...
LINQ: Distinct values
...
Are you trying to be distinct by more than one field? If so, just use an anonymous type and the Distinct operator and it should be okay:
var query = doc.Elements("whatever")
.Select(element => new {
id = (in...
Application Crashes With “Internal Error In The .NET Runtime”
...e state of the garbage collected heap. Which in turn is invariably caused by unmanaged code. The exact location in code at which this exception is raised isn't helpful, the corruption usually occurred well before the damage is detected.
Finding the exact cause for this is going to be difficult. ...
Unmount the directory which is mounted by sshfs in Mac [closed]
...
Use umount, as the docs say (pointed to by the answer of @opsmason).
– Ioannis Filippidis
Apr 10 '15 at 7:41
3
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