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;