Please explain about insertable false and updatable false in reference to the JPA Column annotation

Question

If a field is annotated insertable false  updatable false  doesn t it mean that you cannot insert value nor change the existing value  Why would you want to do that    Entity public class Person         Id      GeneratedValue strategy   GenerationType AUTO      private Long id        OneToMany mappedBy  person   cascade CascadeType ALL      private List lt Address gt  addresses      Entity public class Address         Id      GeneratedValue strategy   GenerationType AUTO      private Long id        ManyToOne      JoinColumn name  ADDRESS FK        Column insertable false  updatable false      private Person person

User · Answer

According to Javax s persistence documentation   Whether the column is included in SQL UPDATE statements generated by the persistence provider   It would be best to understand from the official documentation here

User · Answer

I would like to add to the answers of BalusC and Pascal Thivent another common use of insertable false  updatable false   Consider a column that is not an id but some kind of sequence number  The responsibility for calculating the sequence number may not necessarily belong to the application    For example  sequence number starts with 1000 and should increment by one for each new entity  This is easily done  and very appropriately so  in the database  and in such cases these configurations makes sense

User · Answer

An other example would be on the  created on  column where you want to let the database handle the date creation

User · Answer

You would do that when the responsibility of creating updating the referenced column isn t in the current entity  but in another entity

User · Answer

Defining insertable false  updatable false is useful when you need to map a field more than once in an entity  typically    when using a composite key when using a shared primary key when using cascaded primary keys   This is IMO not a semantical thing  but definitely a technical one

[java] Please explain about insertable=false and updatable=false in reference to the JPA @Column annotation

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