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Java - JPA - @Version annotation
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But still I am not sure how it works?
Let's say an entity MyEntity has an annotated version property:
@Entity
public class MyEntity implements Serializable {
@Id
@GeneratedValue
private Long id;
private String name;
@Version
private Long version;
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LINQ to Entities only supports casting EDM primitive or enumeration types with IEntity interface
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My guess is that the class type is used rather than the interface type. EF doesn't know about the interface type so it can't convert it to SQL. With the class constraint the type inferred is the DbSet<T> type which EF k...
Spring @PostConstruct vs. init-method attribute
...u prefer to configure your system, and that's a matter of personal choice. Myself, I prefer to use @PostConstruct annotations for my own code (as the bean is only correctly configured after the method is called) and I use init-method when instantiating beans from non-Spring-aware libraries (can't ap...
How does a Java HashMap handle different objects with the same hash code?
As per my understanding I think:
14 Answers
14
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How is OAuth 2 different from OAuth 1?
... the notion of refresh tokens. While I'm not entirely sure what these are, my guess is that your access tokens can be short lived (i.e. session based) while your refresh tokens can be "life time". You'd use a refresh token to acquire a new access token rather than have the user re-authorize your app...
how to check the dtype of a column in python pandas
...d all of them (and some additional) in decreasing of reliability order (in my opinion):
1. Comparing types directly via == (accepted answer).
Despite the fact that this is accepted answer and has most upvotes count, I think this method should not be used at all. Because in fact this approach is di...
Do python projects need a MANIFEST.in, and what should be in it?
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In my limited experience is seems that if you want to include files not inside of a python module (dir with init.py), you have to use MANIFEST.in and use the sdist (means: source distribution) command. If you consider that bdist...
Is it good practice to NULL a pointer after deleting it?
... case, a shared pointer or something similar would have been preferable.
My rule of thumb is that if you leave pointers around in user code, you're Doing It Wrong. The pointer shouldn't be there to point to garbage in the first place. Why isn't there an object taking responsibility for ensuring it...
Why do you not use C for your web apps?
...e similar applications in all 4 languages: http://gwan.ch/source/
And, to my dismay, the modern scripting languages were not easier to use.
One part of the job which is especially frustrating is to desperately search for the 'magic' API call that will do what you want to do.
Think about how to do...
How do I delete an exported environment variable?
... variable from the shell too though. Is the only way to unexport to do T="$MYVAR"; unset MYVAR; MYVAR="$T"; unset T ?
– olejorgenb
Dec 10 '16 at 22:05
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