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How to create and handle composite primary key in JPA
...ask is to use @IdClass annotation, and place both your id in that IdClass. Now you can use normal @Id annotation on both the attributes
@Entity
@IdClass(MyKey.class)
public class YourEntity {
@Id
private int id;
@Id
private int version;
}
public class MyKey implements Serializable ...
d3 axis labeling
... because your original answer put me on the right track, but the way it is now, future readers won't have to fiddle with it as much to work out what it all means. :-) Cheers.
– Michael Scheper
Jun 15 '15 at 17:03
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SELECT * WHERE NOT EXISTS
...ays forget how to exactly use it. Thanks - this example will be bookmarked now.
– Mateng
Sep 18 '12 at 9:00
1
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Java: how do I get a class literal from a generic type?
...he additional explanation--my understanding of generics is so much clearer now that I realize they're not a runtime mechanism. :)
– Tom
Mar 5 '10 at 23:49
2
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Why does flowing off the end of a non-void function without returning a value not produce a compiler
...or the general case, so you're stuck with a general rule of thumb. If you know, though, that your end-of-function will never be reached, then you are so far from the semantics of traditional function handling that, yes, you can go ahead and do this and know that it's safe. Frankly, you're a layer be...
What does 'wb' mean in this code, using Python?
...2.6, the docs said that the b mode only had an effect on Windows. That has now been removed from the documentation and binary mode "should be used for all files that don’t contain text".
– Daniel G
Oct 1 '19 at 18:21
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CPU Privilege Rings: Why rings 1 and 2 aren't used?
...ws only uses two rings because it was designed to run on other processors (now defunct) which only had two.
– David
Feb 15 '14 at 12:33
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How to get terminal's Character Encoding
Now I change my gnome-terminal's character encoding to "GBK" (default it is UTF-8), but how can I get the value(character encoding) in my Linux?
...
Why do you program in assembly? [closed]
...e heck out of them in assembly. Or, if they're already experienced, they know which parts are going to be bottlenecks, and they've got optimized pieces sitting around from other games they've built.
The point of programming in assembly is the same as it always has been: speed. It would be ridicul...
What is the difference between Nexus and Maven?
...e Maven repository format. While it supports many other repository formats now, the
Maven repository format is still the most common and well supported format for build and provisioning
tools running on the JVM and beyond.
This chapter shows example configurations for using the repository manager wi...