直接上代码,主要是通过判断其是新增/修改/删除.使用个中间集合辅助

    @Transactional
    public PerformanceInfo updatePerformance(PerformanceInfo performanceInfo){
        PerformanceInfo po = this.performanceDao.get(performanceInfo.getId());
//      po.setDetails(null);
        performanceDao.update(po);//更新主体对象

        List<PerformanceDetail> oldList = this.listPerformanceDetail(performanceInfo.getId()).getRows();//数据库的明细
        List<PerformanceDetail> newList = performanceInfo.getDetails();//页面传递的明细

        Iterator<PerformanceDetail> iterator = oldList.iterator();

        List<PerformanceDetail> matchList = new ArrayList();//用于存放修改操作的明细
        while (iterator.hasNext()) {
            PerformanceDetail oldDetail = iterator.next();
            PerformanceDetail match = null;
            for (PerformanceDetail newDetail : newList) {
                if (newDetail.getId().equals(oldDetail.getId())) {
                    match = newDetail;
                    matchList.add(newDetail); //匹配,表示是修改的明细数据
                    break;
                }
            }
            if (null == match) { // 如果旧的数据并没有在新的列表里，则删除
                if (StringUtils.isMeaningFul(oldDetail.getId())) {
                    this.performanceDetailDao.remove(deleteRecord);
               }
            } else { // 修改
                PerformanceDetail editRecord = this.performanceDetailDao.get(match.getId()); 
                editRecord.setUpdateDate(new Date());
                performanceDetailDao.update(editRecord);
            }
        }

        newList.removeAll(matchList);//remove修改操作的,剩余的都是新增的明细

        //新增明细
        for (PerformanceDetail newDetail : newList) {
            newDetail.setId(StringUtils.uuid());
            newDetail.setPerformanceInfo(po);
            newDetail.setCreateDate(new Date());
            newDetail.setCreateBy(super.getCurUser().getAccountId());
            newDetail.setUpdateBy(super.getCurUser().getAccountId());
            newDetail.setUpdateDate(new Date());
            performanceDetailDao.persist(newDetail);
        }
        po = performanceDao.get(po.getId());
        return po;
    }