[Hibernate]多个字段共同构成主键
表SWPBusinessToDo 拥有2个字段，一起构成主键。

    SWPBusiness  = new SWPBusinessToDo();    SWPBusinessToDoPK pk = new SWPBusinessToDoPK();    pk.setBusinessId( businessId);    pk.setOperator(operatorId);        SWPBusiness.setId(pk);