Entity inheritance means that we can use polymorphic queries for retrieving all the sub-class entities when querying for a super-class. Since Hibernate is a JPA implementation, it contains all of the above as well as a few Hibernate-specific features related to inheritance..
Also to know is, how many types of inheritance are there in hibernate?
3 types
Additionally, what is discriminator value in hibernate? Annotation Type DiscriminatorValue Specifies the value of the discriminator column for entities of the given type. The inheritance strategy and the discriminator column are only specified in the root of an entity class hierarchy or subhierarchy in which a different inheritance strategy is applied.
Likewise, people ask, what is the use of inheritance mapping in hibernate?
@Inheritance - It is used to define the type of inheritance used in hibernate and it is defined in the parent class. If the Inheritance annotation is not specified or if no inheritance type is specified for an entity class hierarchy, the SINGLE_TABLE mapping strategy is used.
What is the use of @MappedSuperclass?
Annotation MappedSuperclass. Designates a class whose mapping information is applied to the entities that inherit from it. A mapped superclass has no separate table defined for it.
Related Question Answers
What is default inheritance strategy in hibernate?
Defines the inheritance strategy to be used for an entity class hierarchy. It is specified on the entity class that is the root of the entity class hierarchy. If the Inheritance annotation is not specified or if no inheritance type is specified for an entity class hierarchy, the SINGLE_TABLE mapping strategy is used.What is JPA specification?
The Java Persistence API (JPA) is a Java specification for accessing, persisting, and managing data between Java objects / classes and a relational database. JPA was defined as part of the EJB 3.0 specification as a replacement for the EJB 2 CMP Entity Beans specification. JPA also requires a database to persist to.Does hibernate support polymorphism?
Yes, hibernate provides complete support to polymorphism. Polymorphism queries and associations are supported at all the mapping strategies of hibernate.What is mapping in hibernate?
Hibernate mappings are one of the key features of Hibernate. They establish the relationship between two database tables as attributes in your model. One to One — It represents the one to one relationship between two tables. One to Many/Many to One — It represents the one to many relationship between two tables.What is a discriminator column?
Discriminator. The discriminator column is always in the table of the base entity. It holds a different value for records of each class, allowing the JPA runtime to determine what class of object each row represents. The DiscriminatorColumn annotation represents a discriminator column.How is inheritance used in spring?
In Spring, the inheritance is supported in bean configuration for a bean to share common values, properties or configurations. A child bean or inherited bean can inherit its parent bean configurations, properties and some attributes. In additional, the child beans are allow to override the inherited value.What is one to many relationship hibernate?
One To Many Mapping in Hibernate. In simple terms, one to many mapping means that one row in a table can be mapped to multiple rows in another table. For example, think of a Cart system where we have another table for Items.What is table per class hierarchy in hibernate?
Table per class hierarchy means – one table for one class hierarchy. Table per subclass hierarchy – one table for one subclass. Table per concrete class hierarchy – one table for one concrete class.How many attributes are there in column annotation?
The @Table annotation allows you to specify the details of the table that will be used to persist the entity in the database. The @Table annotation provides four attributes, allowing you to override the name of the table, its catalogue, and its schema, and enforce unique constraints on columns in the table.Which annotation specifies a column for joining an entity association or element collection?
JoinColumn
Can we extend entity class?
Entity Inheritance. Entities support class inheritance, polymorphic associations, and polymorphic queries. Entity classes can extend non-entity classes, and non-entity classes can extend entity classes. Entity classes can be both abstract and concrete.What is true about table per class strategy?
The table per class strategy is similar to the mapped superclass strategy. The main difference is that the superclass is now also an entity. Each of the concrete classes gets still mapped to its own database table. This mapping allows you to use polymorphic queries and to define relationships to the superclass. 
