If we are using `identity` ID Generator and still we set the primary key to the entity object then which primary key will be stored in the database?

Question

As we know if we use identity ID Generator in Hibernate and if we dont set the primary key value to the entity object then database will insert the primary key value.

But If we are using identity ID Generator and still we set the primary key value to the entity class object like entityClassObject.setPrimaryKeyNo(10) then which primary key will be stored in the database?

Database Provided Primary key
Ours provided primary key

Can someone prove it ?

Why don't you try it and see what happens? – The Head Rush Jun 09 '18 at 12:05 — The Head Rush, Jun 09 '18 at 12:05
Would have taken you 10 seconds to try in your project. – Strelok Jun 09 '18 at 13:52 — Strelok, Jun 09 '18 at 13:52

score 0 · Answer 1 · answered Jun 09 '18 at 13:49

Database provided primary key. More accurately, primary key provided by the persistence provider.

From javadoc of GenerationType.IDENTITY:

IDENTITY

public static final GenerationType IDENTITY

Indicates that the persistence provider must assign primary keys for the entity using a database identity column.

From Hibernate-5.3.1.Final User Guide:

2.6.9. Using IDENTITY columns

For implementing identifier value generation based on IDENTITY columns, Hibernate makes use of its org.hibernate.id.IdentityGenerator id generator which expects the identifier to generated by INSERT into the table.

If we are using `identity` ID Generator and still we set the primary key to the entity object then which primary key will be stored in the database?

1 Answers1