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How to create and handle composite primary key in JPA
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You can make an Embedded class, which contains your two keys, and then have a reference to that class as EmbeddedId in your Entity.
You would need the @EmbeddedId and @Embeddable annotations.
@Entity
public class YourEntity {
@EmbeddedId
private MyKey myKey;
@Column(name ...
How do I use disk caching in Picasso?
I am using Picasso to display image in my android app:
9 Answers
9
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How can I detect the encoding/codepage of a text file
...n't detect the codepage, you need to be told it. You can analyse the bytes and guess it, but that can give some bizarre (sometimes amusing) results. I can't find it now, but I'm sure Notepad can be tricked into displaying English text in Chinese.
Anyway, this is what you need to read:
The Absolut...
Multiple Inheritance in PHP
... take care about rendering output. Instead, you could split responsibility and use MessageDispatcher that sends the Message passed using text or html backend. I don't know your code, but let me simulate it this way:
$m = new Message();
$m->type = 'text/html';
$m->from = 'John Doe <jdoe@yah...
How to build jars from IntelliJ properly?
I have a project that contains a single module, and some dependencies.
I'd like to create a jar, in a separate directory, that contains the compiled module. In addition, I'd like to have the dependencies present beside my module.
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LINQ: Select an object and change some properties without creating a new object
...ome properties of a LINQ query result object without creating a new object and manually setting every property. Is this possible?
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List of standard lengths for database fields
I'm designing a database table and once again asking myself the same stupid question: How long should the firstname field be?
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Implications of foldr vs. foldl (or foldl')
...rstly, Real World Haskell , which I am reading, says to never use foldl and instead use foldl' . So I trust it.
7 Ans...
delete a.x vs a.x = undefined
...a.x = undefined
means that a.hasOwnProperty("x") will still return true, and therefore, it will still show up in a for in loop, and in Object.keys()
delete a.x
means that a.hasOwnProperty("x") will return false
The way that they are the same is that you can't tell if a property exists by testi...
How to convert ‘false’ to 0 and ‘true’ to 1 in Python
Is there a way to convert true of type unicode to 1 and false of type unicode to 0 (in Python)?
7 Answers
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