Discriminator column not accessible

[RamandeepS Singh]

Hi Everyone

in @inheritance type Joined

I have class person, employee and Student

i have common columns in Person , and getters setters for discriminator column if i have to access it from person class

@Inheritance(strategy=InheritanceType.JOINED)
@DiscriminatorColumn(name="PERSON_TYPE", discriminatorType=DiscriminatorType.STRING)
public class Person

 @Column(name = "RELATIONSHIP_TYPE",insertable=false,nullable=false,updatable=false)
    private String relationType;

// getters and setters

@DiscriminatorValue("STUDENT")
@PrimaryKeyJoinColumn(name="PERSON_ID")
public class Student

@DiscriminatorValue("EMPLOYEE")
@PrimaryKeyJoinColumn(name="PERSON_ID")
public class Employee

so when i am saving the Employee or Student record and then retrieving Person record, It is giving me discriminator column value as NULL
but after restarting the server its giving me value accordingly

if i manually set the value of discriminator column value and then save and retrieve then its giving me the value (Do i need to manaully set the discriminator column value?)
then what is benefit of using discriminator column

why should i not use OneToMany relation of person with employee and student having column Type and via enum i can enter the perspective value into the column
and i will also apply lazy fetching on that columns

Please Suggest

Thanks In Advance
Ramandeep Singh

[Bill Gorder]

Please edit your post and UseCodeTags.

[Bill Gorder]

Do i need to manaully set the discriminator column value?

No. Not when you are using it properly.


The inheritance strategy you have chosen does not use a discriminator.