- java.lang.Object
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- java.lang.Enum<GenerationType>
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- javax.persistence.GenerationType
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- All Implemented Interfaces:
- Serializable, Comparable<GenerationType>
public enum GenerationType extends Enum<GenerationType>
Defines the types of primary key generation strategies.- Since:
- Java Persistence 1.0
- See Also:
GeneratedValue
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Enum Constant Summary
Enum Constants Enum Constant and Description AUTOIndicates that the persistence provider should pick an appropriate strategy for the particular database.IDENTITYIndicates that the persistence provider must assign primary keys for the entity using a database identity column.SEQUENCEIndicates that the persistence provider must assign primary keys for the entity using a database sequence.TABLEIndicates that the persistence provider must assign primary keys for the entity using an underlying database table to ensure uniqueness.
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Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method and Description static GenerationTypevalueOf(String name)Returns the enum constant of this type with the specified name.static GenerationType[]values()Returns an array containing the constants of this enum type, in the order they are declared.
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Enum Constant Detail
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TABLE
public static final GenerationType TABLE
Indicates that the persistence provider must assign primary keys for the entity using an underlying database table to ensure uniqueness.
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SEQUENCE
public static final GenerationType SEQUENCE
Indicates that the persistence provider must assign primary keys for the entity using a database sequence.
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IDENTITY
public static final GenerationType IDENTITY
Indicates that the persistence provider must assign primary keys for the entity using a database identity column.
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AUTO
public static final GenerationType AUTO
Indicates that the persistence provider should pick an appropriate strategy for the particular database. TheAUTOgeneration strategy may expect a database resource to exist, or it may attempt to create one. A vendor may provide documentation on how to create such resources in the event that it does not support schema generation or cannot create the schema resource at runtime.
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Method Detail
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values
public static GenerationType[] values()
Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:for (GenerationType c : GenerationType.values()) System.out.println(c);
- Returns:
- an array containing the constants of this enum type, in the order they are declared
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valueOf
public static GenerationType valueOf(String name)
Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)- Parameters:
name- the name of the enum constant to be returned.- Returns:
- the enum constant with the specified name
- Throws:
IllegalArgumentException- if this enum type has no constant with the specified nameNullPointerException- if the argument is null
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Document created the 11/06/2005, last modified the 18/08/2025
Source of the printed document:https://www.gaudry.be/en/java-api-javaee-rf-javax/persistence/GenerationType.html
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