• Domain Model
  • Identifiers
    • Simple identifiers
    • Composite identifiers
    • Composite identifiers with @EmbeddedId
    • Composite identifiers with @IdClass
    • Composite identifiers with associations
    • Generated identifier values
    • Interpreting AUTO
    • Using sequences
    • Using IDENTITY columns
    • Using identifier table
    • Using UUID generation
    • Optimizers
    • Using @GenericGenerator
    • Derived Identifiers

Identifiers 对应的 database column

• UNIQUE
• NOT NULL - The values cannot be null. For composite ids, no part can be null.
• IMMUTABLE - The values, once inserted, can never be changed

In cases where the values for the PK you have chosen will be updated, Hibernate recommends mapping the mutable value as a natural id, and use a surrogate id for the PK