类型转换错误java.math.BigDecimal cannot be cast to java.lang.String

数据库获取统计参数sum()统计值，在代码转化为Integer 时，提示转换失败：java.math.BigDecimal cannot be cast to java.lang.String

解决办法：

List set= util.excuteQuery("select COALESCE(sum(1),0) as times from wlsq_data.home_pet_feeder_timing where gateway_id=? and timing_id=? and del_flag=0  ", objs);if(set !=null && set.size() >0){for(Object obj:set){HashMap<String, Object> map =(HashMap<String, Object>)obj;Integer str = Integer.parseInt(map.get("times").toString());if(str == 0){    result = 0;    }else{    result = str;    }}    }

使用coalesce 函数，解决统计数据为空，默认赋值为0;