About unique

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JDO Doc
7

javax.jdo.annotations.Query

of the result Default value: void.class Since: JDO 2.1 String unique Whether the query returns a single unique result. Whether the query returns a single unique result. Returns: whether the query returns a single unique result Default value: "" Since: JDO 2.1 String unmodifiable Whether the query
JPA Doc
7

javax.persistence.Column

value: "" Since: JPA 1.0 boolean unique (Optional) Whether the column is a unique key. (Optional) Whether the column is a unique key. This is a shortcut for the UniqueConstraint annotation at the table level and is useful for when the unique key constraint corresponds to only a single column
JPA Doc
7

javax.persistence.JoinColumn

of the collection table. Default value: "" Since: JPA 1.0 boolean unique (Optional) Whether the property is a unique key. (Optional) Whether the property is a unique key. This is a shortcut for the UniqueConstraint annotation at the table level and is useful for when the unique key constraint
JPA Doc
7

javax.persistence.MapKeyColumn

: "" Since: JPA 2.0 boolean unique (Optional) Whether the column is a unique key. (Optional) Whether the column is a unique key. This is a shortcut for the UniqueConstraint annotation at the table level and is useful for when the unique key constraint corresponds to only a single column. This constraint
JPA Doc
7

javax.persistence.MapKeyJoinColumn

: "" Since: JPA 2.0 boolean unique (Optional) Whether the property is a unique key. (Optional) Whether the property is a unique key. This is a shortcut for the UniqueConstraint annotation at the table level and is useful for when the unique key constraint is only a single field. Default value: false
JPA Doc
7

javax.persistence.TableGenerator

1.0 String name (Required) A unique generator name that can be referenced by one or more classes to be the generator for id values. (Required) A unique generator name that can be referenced by one or ... UniqueConstraint[] uniqueConstraints (Optional) Unique constraints that are to be placed on the table
JDO Doc
5

Element.uniqueKey

Annotation Element javax.jdo.annotations.Element String uniqueKey The name of the unique key constraint to generate. Returns: the name of the unique key constraint Default value: "" Since: JDO 2.1
JPA Doc
5

javax.persistence.CollectionTable

[] uniqueConstraints (Optional) Unique constraints that are to be placed on the table. (Optional) Unique
JPA Doc
5

javax.persistence.GenerationType

uniqueness. Indicates that the persistence provider must assign primary keys for the entity using an underlying database table to ensure uniqueness. Since: JPA 1.0 GenerationType valueOf(String name
JPA Doc
5

javax.persistence.JoinTable

UniqueConstraint[] uniqueConstraints (Optional) Unique constraints that are to be placed on the table. (Optional) Unique constraints that are to be placed on the table. These are only used if table