Grails: Foreign key as primary key?

问题

first of all i have to say that i have an existing database that it can not be modify (that´s why i am having this problem)

I have two cases, the first one is this: In this case the id (primary key) must be a foreign key as well. The code that i put, it doesn´t work.

class SbPEstadoComponente {

    static mapping = {
         table 'SB_P_ESTADO_COMPONENTE'         
         version false
         idEstadoComponenteHxPEstado column:'ID_ESTADO_COMPONENTE'
     id column:'ID_ESTADO_COMPONENTE'
    }

    // Relation
    SbPDemora idEstadoComponenteHxPEstado
    String facturable
    ..
    ..
    ..
}

In the other case the table has 3 columns, that coluns are foreign key to 3 tables. Also those 3 columns have to be a composite primary key.

Any ideas? sugestions? Thanks a lot !!

回答1:

In your child class's mapping you need id composite: ['fkey1', 'fkey2'] and implements Serializable

Note that when you do a get you will need to populate all the composite key values

来源：https://stackoverflow.com/questions/4936542/grails-foreign-key-as-primary-key