Which are the three types of inheritance mapping in Hibernate?

Hibernate supports the three basic inheritance mapping strategies:

table per class hierarchy.
table per subclass.
table per concrete class.

What is Hibernate inheritance mapping?

Entity inheritance means that we can use polymorphic queries for retrieving all the subclass entities when querying for a superclass. Since Hibernate is a JPA implementation, it contains all of the above as well as a few Hibernate-specific features related to inheritance.

What is inheritance mapping?

Inheritance . The following mapping strategies are used to map the entity data to the underlying database: A single table per class hierarchy. A table per concrete entity class.

How many types of association mapping are possible in Hibernate?

Following are the four ways in which the cardinality of the relationship between the objects can be expressed. An association mapping can be unidirectional as well as bidirectional….Association Mappings.

Sr.No.	Mapping type & Description
2	One-to-One Mapping one-to-one relationship using Hibernate

What is discriminator in Hibernate?

In case of table per class hierarchy an discriminator column is added by the hibernate framework that specifies the type of the record. It is mainly used to distinguish the record. To specify this, discriminator subelement of class must be specified. The subclass subelement of class, specifies the subclass.

How does Hibernate mapping work?

Hibernate takes care of mapping Java classes to database tables using XML files and without writing any line of code. Provides simple APIs for storing and retrieving Java objects directly to and from the database. If there is change in the database or in any table, then you need to change the XML file properties only.

What is discriminator column in Hibernate?

Discriminator is commonly used in SINGLE_TABLE inheritance because you need a column to identify the type of the record. Example: You have a class Student and 2 sub-classes: GoodStudent and BadStudent.

What kind of mapping is preferred for Hibernate inheritance mapping?

There are three inheritance mapping strategies defined in the hibernate: Table Per Hierarchy. Table Per Concrete class. Table Per Subclass.

What is discriminator column?

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.