Mybatis返回Map,List

            上次寫[簡單]Spring_Mybatis_CRUD簡單示例(帶數據庫)，遇到一個問題，在返回Map類型時候沒有解析正確，不得不返回一個JavaBean，趁着有空，重新看了下，現在可以用Mybatis返回Map,List<Map>了。

            返回Map,Mybatis配置如下：

           

<select id="getCountyHashMap" resultType="java.util.HashMap">
        select name,id from
        tsql_test_region where
        id=#{id}
    </select>

    ServiceImpl如下：

  

public Map<String, Long> getCountyHashMap(long id) {
        Map<String, Object> regionMap = regionInfoMapper.getCountyHashMap(id);
        Map<String, Long> resultMap = new HashMap<String, Long>();
        String region = null;
        Long vid = null;
        for (Map.Entry<String, Object> entry : regionMap.entrySet()) {
            if ("NAME".equals(entry.getKey())) {
                region = (String) entry.getValue();
            } else if ("ID".equals(entry.getKey())) {
                vid = ((java.math.BigDecimal) entry.getValue()).longValue();
            }
        }
        resultMap.put(region, vid);
        return resultMap;
    }

    Controller如下:

  

@RequestMapping(value = "/region3", method = RequestMethod.GET)
    public @ResponseBody
    Map<String, Long> getCountyMap(@RequestParam(required = true) int regionId) {
        return regionInfoService.getCountyHashMap(regionId);
    }

    結果爲：

 

    

     返回List<Map>類似:

     Mybatis配置:

  

<select id="getRegionHashMap" resultType="java.util.HashMap">
        select name,id from
        tsql_test_region order by id
    </select>

   ServiceImpl如下:

  

public Map<String, Long> getRegionHashMap() {
        List<Map<String, Object>> regionMap = regionInfoMapper
                .getRegionHashMap();
        Map<String, Long> resultMap = new HashMap<String, Long>();
        for (Map<String, Object> map : regionMap) {
            String region = null;
            Long id = null;
            for (Map.Entry<String, Object> entry : map.entrySet()) {
                if ("NAME".equals(entry.getKey())) {
                    region = (String) entry.getValue();
                } else if ("ID".equals(entry.getKey())) {
                    id = ((java.math.BigDecimal) entry.getValue()).longValue();
                }
            }
            resultMap.put(region, id);
        }
        return resultMap;
    }

   Controller如下:

  

@RequestMapping(value = "/region2", method = RequestMethod.GET)
    public @ResponseBody
    Map<String, Long> getRegionMap() {
        return regionInfoService.getRegionHashMap();
    }

    結果爲：

 

    

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