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## javax.jdo.annotations
Annotation Type PrimaryKey

    @Target(value={TYPE,FIELD,METHOD})
    @Retention(value=RUNTIME)
    public @interface PrimaryKey

Annotation on a member to define it as a primary key member of a class or persistent interface using application identity. Also used to define the primary key columns of a secondary table. Corresponds to the xml element "primary-key".

Since:
  2.1
Version:
  2.1

Optional Element Summary
`java.lang.String` | `column` Name of the column to use for the primary key
`Column[]` | `columns` The column(s) for the primary key
`java.lang.String` | `name` Name of the primary key constraint

### name

    public abstract java.lang.String name

  Name of the primary key constraint

  Returns:
    the name of the primary key constraint
  Default:
    ""

### column

    public abstract java.lang.String column

  Name of the column to use for the primary key

  Returns:
    the name of the column to use for the primary key
  Default:
    ""

### columns

    public abstract Column[] columns

  The column(s) for the primary key

  Returns:
    the column(s) for the primary key
  Default:
    {}

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