java – AliasToBeanResultTransformer和Hibernate SQLQuery

我有一个相当复杂的查询(HQL或Criteria查询的嵌套级别太多),因此我将其编写为SQLQuery.我真的想使用AliasToBeanResultTransformer将我的结果转换为List,但是我遇到了一些问题.我已经将代码片段包含在我现在所拥有的代码片段之下.

当我记录转换后的查询的结果时,我可以看到转换器确实创建了一个List,但是,每个AdvancedClauseSearchResultDTO中的所有字段都是null.我认为这意味着我在使用别名做错了… AliasToBeanResultTransformer无法找到要调用的正确setter.但是,AdvancedClauseSearchResultDTO类确实为我在sql字符串中别名的每个列都有公共setter.如果这是一个Criteria查询,我会使用projection为每个要返回的列定义一个别名,但我不确定如何使用SQLQuery完成同样的事情.

有关如何设置别名的建议,以便ResultTransformer可以使用它们吗？我已经看到一些有限的文档表明使用’as aliasName’方法应该有效,但它似乎不适合我.

查询字符串定义的开头片段,请注意’as’别名定义

StringBuffer clauseBaseQuery = new StringBuffer();
        clauseBaseQuery.append("select ");
        clauseBaseQuery.append(" clauseDetail.clause_detail_id as clauseDetailId,");
        clauseBaseQuery.append(" clauseDetail.clause_id as clauseId,");
        clauseBaseQuery.append(" providers.provider_name as provider,");
        clauseBaseQuery.append(" products.product_name as product,");

SQLQuery创建& resultTransformer的设置

Query query  = session.createSQLQuery(clauseBaseQuery.toString());
query.setResultTransformer(new AdvancedClauseSearchResultTransformer());
return (List<AdvancedClauseSearchResultDTO>)query.list();

AdvancedClauseSearchResultTransformer类(使用AliasToBeanResultTransformer,然后执行一些额外的处理)：

class AdvancedClauseSearchResultTransformer implements ResultTransformer {

        //Use the aliasTransformer to do most of the work
        ResultTransformer aliasTransformer = Transformers.aliasToBean(AdvancedClauseSearchResultDTO.class);

        @Override
        public List transformList(List list) {
            log.debug("transforming CLAUSE results");
            List<AdvancedClauseSearchResultDTO> result = aliasTransformer.transformList(list);
            //for each row,set the status field
           for (AdvancedClauseSearchResultDTO dto : result) {
                log.debug("dto = " + dto);
                String status = null;
                Date effectiveDate = dto.getEffectiveDate();
                Date terminationDate = dto.getTerminationDate();
                Date now = new Date(System.currentTimeMillis());
                if (now.before(effectiveDate)) {
                    status = "Pending";
                } else if (now.after(terminationDate)) {
                    status = "Terminated";
                } else {
                    status = "Active";
                }
                dto.setStatus(status);

                if (StringUtils.isNotEmpty(dto.getReasonForAmendment())){
                    dto.setAmended(Boolean.TRUE);
                }else{
                    dto.setAmended(Boolean.FALSE);
                }
            }

            return result;
        }

        @Override
        public Object transformTuple(Object[] os,String[] strings) {
            Object result = aliasTransformer.transformTuple(os,strings);

            return result;
        }
    }

StringBuffer clauseBaseQuery = new StringBuffer();
clauseBaseQuery.append("select ");
clauseBaseQuery.append(" clauseDetail.clause_detail_id as "clauseDetailId",");
clauseBaseQuery.append(" clauseDetail.clause_id as "clauseId",");
clauseBaseQuery.append(" providers.provider_name as "provider",");
clauseBaseQuery.append(" products.product_name as "product",");
Query query  = session.createSQLQuery(clauseBaseQuery.toString());

query.setResultTransformer(Transformers.aliasToBean(AdvancedClauseSearchResultDTO.class));