Inheritance Mappings:

Inheritance Mappings:

  • There is no easy way to convert class hierarchies into database tables in relational databases.
  • The JPA standard offers many options for dealing with this:
  • A MappedSuperclass's parent classes cannot be entitled.
  • Entities from several classes with a common ancestor are put together in a single table.
  • Each class has its table, which must be joined to query a subclass object.
  • Table-Per-Class – a table for a class contains all of the characteristics for that class, removing the need for a join.

Each method creates a distinct database structure.

Entity inheritance implies using polymorphic queries to get all of the sub-class entities while asking for a super-class.

The @Entity annotation has been removed from this class since it will not be persisted in the database by itself.

Next, let's make an employee sub-class:

@Entity is a public class. MyEmployee adds the following private Strings to Person: / [native code] function Object(), getters, and setters

This will result in one database table called "MyEmployee," with three columns for sub-declared classes and inherited fields.

If we adopt this technique, we won't incorporate relationships with other objects in our ancestors.

@MappedSuperclass has generated a public static class called Account.

@Id private Long id; @Id public id; @Id public id; @Id public id;

a private String's owner

balance in BigDecimal; private BigDecimal balance;

interestRate; interestRate; interestRate; interestRate; interestRate; interestRate; interestRate

For the sake of brevity, getters and setters have been removed.

}
@Entity(name = "DebitAccount") @Entity(name = "DebitAccount") @Entity(name = " @Entity(name = "DebitAccount") @Entity(name = "DebitAccount") @Entity(name = " @Entity(name = "DebitAccount extends Account and is a public static class.
overdraftFee; private BigDecimal overdraftFee; Getters and setters have been deleted for the purpose of brevity.

@Entity(name = "CreditAccount") @Entity(name = "CreditAccount") @Entity(name = " @Entity(name = "CreditAccount") @Entity(name = "CreditAccount") @Entity(name = " static public class @Entity(name = " static public class @Entity(name = " static public class @Entity( CreditAccount extends an account.

creditLimit; creditLimit; creditLimit; creditLimit; creditLimit; creditLimit; creditLimit; creditLimit; creditLimit; creditLimit; creditLimit; creditLimit; creditLimit;
Getters and setters have been deleted for the purpose of brevity.