@GeneratedValue: Difference between revisions
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* [[JPA Concepts#@GeneratedValue|JPA Concepts]] | * [[JPA Concepts#@GeneratedValue|JPA Concepts]] | ||
* [[Spring_Data_JPA# | * [[Spring_Data_JPA#Define_Entity.27s_ID|Spring Data JPA]] | ||
=Overview= | =Overview= | ||
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<syntaxhighlight lang='java'> | <syntaxhighlight lang='java'> | ||
@GeneratedValue(strategy = GenerationType.AUTO) | @GeneratedValue(strategy = GenerationType.AUTO) | ||
</syntaxhighlight> | |||
Used together with [[@Id]] when relying on the database to automatically generate the ID value, define "strategy = AUTO". This declaration works with an [[H2]] database. | |||
=Cases= | |||
For a PostgreSQL table in which the primary key was declared as follows: | |||
<syntaxhighlight lang='sql'> | |||
id BIGINT UNIQUE GENERATED ALWAYS AS IDENTITY, | |||
</syntaxhighlight> | |||
the corresponding annotation combination that works is: | |||
<syntaxhighlight lang='java'> | |||
@Id | |||
@GeneratedValue(strategy=GenerationType.IDENTITY) | |||
private Long id; | |||
</syntaxhighlight> | </syntaxhighlight> | ||
Latest revision as of 20:07, 10 November 2018
Internal
Overview
@GeneratedValue(strategy = GenerationType.AUTO)
Used together with @Id when relying on the database to automatically generate the ID value, define "strategy = AUTO". This declaration works with an H2 database.
Cases
For a PostgreSQL table in which the primary key was declared as follows:
id BIGINT UNIQUE GENERATED ALWAYS AS IDENTITY,
the corresponding annotation combination that works is:
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
private Long id;