Hibernate annotation (annoation) generate policy using ID primary key

The hibernate annotation (annoation) uses the Id primary key to generate the main use of the following annotations: @Id, @GeneratedValue, @GenericGenerator. , the @GeneratedValue is the JPA default implementation custom primary key generation strategy, @GenericGenerator is hibernate based on the JPA enhancements.

Custom primary key generation policy, implemented by @genericgenerator. Hibernate is extended on the basis of JPA, and it can be used to introduce Hibernate's unique primary key generation strategy, which is joined by @genericgenerator.

For example, JPA standard usage

1 2	@Id @GeneratedValue (Generationtype.auto)

You can use Hibernate to implement the following usage

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@GeneratedValue (strategy = Generationtype.auto) @GenericGenerator (name = "Paymentablegenerator", strategy = "native")

Using @generatedvalue

1, for the Mysql,oracle,sqlserver database can be used at the same time

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@Id @GeneratedValue (strategy = Generationtype.auto)