SpringDataJpa entity class - primary key generation strategy

primary key configuration

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "cust_id")
    private Long custId;//主键    

• @Id: Indicates that this annotation indicates that this attribute corresponds to the primary key in the data table
• @GeneratedValue(strategy = GenerationType.IDENTITY)

This annotation indicates the generation strategy of configuring the primary key, similar to auto-increment in mysql.

strategy indicates the strategy used by this annotation, you can use GenerationType.IDENTITY, GenerationType.SEQUENCE, GenerationType.TABLE, GenerationType.AUTO.

GenerationType.IDENTITY: The underlying database must support auto-growth, (similar to mysql auto-increment)

GenerationType.SEQUENCE: The underlying database must support sequences, (Oracle)

GenerationType.TABLE: A mechanism provided by jpa to help complete primary key auto-increment in the form of a data table

GenerationType.AUTO: The program automatically selects the appropriate primary key generation strategy