Package javax.jdo.annotations

Annotation Type Unique

  • @Target({TYPE,FIELD,METHOD})
@Retention(RUNTIME)
@Repeatable(Uniques.class)
public @interface Unique
    Annotation for a database unique constraint. Used for database schema generation to create unique constraints. Also used to reorder database operations when flushing changes to avoid unique constraint violations. Corresponds to the xml element "unique".
    Since:
    2.1
    Version:
    2.1

    • Optional Element Summary

      Optional Elements 
      Modifier and Type Optional Element Description
      Column[] columns
      Columns that compose this unique constraint.
      String deferred
      Whether this unique constraint is deferred until commit.
      Extension[] extensions
      Vendor extensions.
      String[] members
      Member (field and property) names that compose this unique constraint.
      String name
      Name of the unique constraint.
      String table
      Table for the unique constraint.

    • Element Detail

      • name

        String name
        Name of the unique constraint.
        Returns:
        the name of the unique constraint
        Default:
        ""

      • table

        String table
        Table for the unique constraint. This is needed iff annotating a type where this unique constraint is not for the primary table for the persistent class or interface.
        Returns:
        the table on which the unique constraint is defined
        Default:
        ""

      • deferred

        String deferred
        Whether this unique constraint is deferred until commit.
        Returns:
        whether this unique constraint is deferred until commit
        Default:
        ""

      • members

        String[] members
        Member (field and property) names that compose this unique constraint.
        Returns:
        member names that compose this unique constraint
        Default:
        {}

      • columns

        Column[] columns
        Columns that compose this unique constraint.
        Returns:
        columns that compose this unique constraint
        Default:
        {}

      • extensions

        Extension[] extensions
        Vendor extensions.
        Returns:
        the vendor extensions
        Default:
        {}