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What's the use of @Embedded and @Embeddable In Hibernate ? Because every example i found on internet is inserting data inside of a single table and to do that using two different class. My point is if I am using a single table then I can map all the columns inside of a single class then why should i use different class. and if We use two different table then there is one-to-one and one-to-many hibernate relationship.
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@Embedded / @Embeddable allows us to easily do this without having to split the database table. Second, it allows for reuse of common mappings between entities. Say each table has a simple revision tracking, with two columns containing the username of the person who changed the row, and the time it happened.
4. @Embedded. The JPA annotation @Embedded is used to embed a type into another entity.
The @Embedded annotation is used to specify a persistent field or property of an entity whose value is an instance of an embeddable class.
Embeddable classes are used to represent the state of an entity but don't have a persistent identity of their own, unlike entity classes. Instances of an embeddable class share the identity of the entity that owns it. Embeddable classes exist only as the state of another entity.
Example of @Embeddable and @Embedded in Hibernate Annotation. One entity can be embedded in another entity. The attributes of an entity can be common attributes of more than one entity. In this case there can be one embeddable entity. And this embeddable entity can be embedded in more than one entity.
In this tutorial we show how to embed one entity inside another entity, so they are mapped to a single table. With Hibernate we can use the @Embeddable annotation to mark a class to be eligible as an embeddable class. We can use the @Embedded annotation to embed an embeddable class.
With JPA and Hibernate we can use the @Embeddable annotation to mark a class to be eligible as an embeddable class. We can use the @Embedded annotation to embed an embeddable class. The attributes of an embedded class can be overridden using the @AttributeOverrides and the @AttributeOverride annotations.
We can use the @Embedded annotation to embed an embeddable class. The attributes of embedded class can be overridden using the @AttributeOverrides and the @AttributeOverride annotations.
There are two types of objects in Hibernate
1. Value Object
2. Entities
Value Objects are the objects which can not stand alone. Take Address, for example. If you say address, people will ask whose address is this. So it can not stand alone.
Entity Objects are those who can stand alone like College and Student.
So in case of value objects preferred way is to Embed them into an entity object.
To answer why we are creating two different classes: first of all, it's a OOPS concept that you should have loose coupling and high cohesion among classes. That means you should create classes for specialized purpose only. For example, your Student class should only have the info related to Student.
Second point is that by creating different classes you promote re-usability.
When we define the value object for the entity class we use @Embeddable.
When we use value type object in entity class we use @Embedded
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