ssh框架中联合查询所取结果不在单一实体，sql写法

需求，ssh框架中查询出的数据不在单一实体中，需要3表进行联合查询获取数据

在写sql后，需要进行设置别名的方式，把查询出的数据库字段与实体对应，注意，必须与实体名称相符并且区分大小写，还需要手动进行映射，否则查询数据为空

daoimpl中

public List getPlan(String mainId) {
        // TODO Auto-generated method stub
        Session session = getHibernateSession();
        String sql="select  distinct d.FD_ORDER ,a.FD_ID as fdPlanId,"
                + " from CN_CONTRACT_PLAN a LEFT JOIN CN_INVOICE_PLAN b ON a.DOC_MAIN_ID=b.DOC_MAIN_ID "
                +" where a.DOC_MAIN_ID='"+mainId+"'"+" ORDER BY d.FD_ORDER";
        //List<CnCashDetail> list=session.createSQLQuery(sql).addEntity(CnCashDetail.class).list();
        
         List<CnCashDetail> list = (List<CnCashDetail>) session.createSQLQuery(sql)
                    .addScalar("fdPlanId", Hibernate.STRING).addScalar("fdLandmark", Hibernate.STRING)
                    .addScalar("fdCashCate", Hibernate.STRING).addScalar("fdReceivables", Hibernate.DOUBLE)
                    .addScalar("fdCollected", Hibernate.DOUBLE).addScalar("fdBadDebt", Hibernate.DOUBLE)
                    .addScalar("fdUnreceivable", Hibernate.DOUBLE)
                    .addScalar("fdInvoiced", Hibernate.DOUBLE)
                    .addScalar("fdThisReturn", Hibernate.DOUBLE)
                    .setResultTransformer(Transformers.aliasToBean(CnCashDetail.class)).list();
        
        
        
        return list;
    }

可以使用查询结果并集

select a.FD_ID as fdProCnId,a.FD_PRO_ID as fdProLineId, FROM CN_CONTRACT_QUOTE a "+
" where a.DOC_MAIN_ID='"+mainId+"' UNION select b.FD_ID,b.FD_PURCH_ID "+
" FROM CN_CONTRACT_PUR b where b.DOC_MAIN_ID='"+mainId+"' and b.FD_IS_INTEGRATION=0";

sql报错from未找到原因

1，别名不可使用单引号

2，from前空格不可少