Hibernate object identifier Generation policy

Increment: The identifier is automatically generated incrementally by hibernate and is applied to the proxy primary key;

Identity: generated by the underlying database identifier, applicable to the proxy primary key;

Sequcence: The identifier is generated by hibernate based on the sequence of the underlying database and is applicable to the proxy primary key; (MySQL does not apply)

Hilo: The identifier generated by hibernate based on the High/low algorithm, applicable to the proxy primary key;

Native: Select Identity/sequcence/hilo for the proxy primary key, based on the support capabilities of the underlying database for auto-generated identifiers.

Tables generated using increment are not using auto increment, whereas tables generated using identity or native use auto increment.