I seem to have problems with mapping a List in Hibernate. In our project there a class Card with contains a class Answer with Answer containing a List<String>.
Is a List<String> mappable by Hibernate using annotations? I mean, since it does not have the @Entity annotation?
Regards
Use @ElementCollection:
@ElementCollection
@CollectionTable(name="Nicknames", joinColumns=@JoinColumn(name="user_id"))
@Column(name="nickname")
public List<String> getNicknames() { ... }
Source: 7.2.3. Collections of basic types and embeddable objects
CollectionTable automatically create a table called "Nicknames" if it is not created?CollectionTable for me :) Thanks!try
@org.hibernate.annotations.CollectionOfElements(
targetElement = java.lang.String.class
)
@JoinTable(
name = "foo",
joinColumns = @JoinColumn(name = "foo_id")
)
@org.hibernate.annotations.IndexColumn(
name = "POSITION", base = 1
)
@Column(name = "baz", nullable = false)
private List<String> arguments = new ArrayList<String>();
or see this detail example
If you are happy to store them in the same column as JSON (MySQL, PostgreSQL that also support indexing and binary JSON), you could simply use io.hypersistence/hypersistence-utils-hibernate-52 library.
@TypeDefs({
@TypeDef(name = "json", typeClass = JsonType.class)
})
public class YourEntity {
@Column(nullable = false)
@Type(type = "json")
private List<String> fieldName = List.of();
...
}
See full guide here
