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Composite primary key jpa

Michelle Hofer answered on June 24, 2022 Popularity 9/10 Helpfulness 1/10

answer Composite primary key jpa

Composite primary key jpa

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-2

 // parent entity has simple primary key

    @Entity
    public class Employee {
       @Id long empId;
       String name;
       ...
    }

    // dependent entity uses EmbeddedId for composite key

    @Embeddable
    public class DependentId {
       String name;
       long empid;   // corresponds to primary key type of Employee
    }

    @Entity
    public class Dependent {
       @EmbeddedId DependentId id;
        ...
       @MapsId("empid")  //  maps the empid attribute of embedded id
       @ManyToOne Employee emp;
    }

Popularity 9/10 Helpfulness 1/10 Language java

Source: docs.jboss.org

Tags: composite foreign-keys java jpa primary-key

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Contributed on Jun 24 2022

Michelle Hofer

0 Answers Avg Quality 2/10

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