异常日志：
!Nutz SQL Error: 'SELECT avg(tem) as tem FROM base_station_actual_data b WHERE b.tem!=999999 AND b.date_time >= '2018-02-09' AND b.date_time < '2018-02-10' AND substring(b.date_time, 12, 2) IN ('07', '09', '10') AND b.station_id_c='C1523''
PreparedStatement:
'SELECT avg(tem) as tem FROM base_station_actual_data b WHERE b.tem!=999999 AND b.date_time >= ? AND b.date_time < ? AND substring(b.date_time, 12, 2) IN ('07', '09', '10') AND b.station_id_c=?'
CaseMessage=Before start of result set

代码：

//根据传入日期获取农作物过去十天平均温度
	public double getTemAvgPast10Days(String past10date,String date,String stationCode){
		
		String sqlStr="SELECT "+
				"avg(tem) as tem "+
				"FROM "+
				"base_station_actual_data b "+
				"WHERE "+
				"b.tem!=999999 "+
				"AND b.date_time >= @past10date "+
				"AND b.date_time < @date "+
				"AND substring(b.date_time, 12, 2) IN ('07', '09', '10') "+
				"AND b.station_id_c=@stationCode ";
		
		//测试
		past10date="2018-02-09";
		date="2018-02-10";
		
		Sql sql = Sqls.queryRecord(sqlStr);
		sql.params().set("past10date", past10date);
		sql.params().set("date", date);
		sql.params().set("stationCode", "C1523");
		
		sql.setCallback(new SqlCallback() {
	        public Object invoke(Connection conn, ResultSet rs, Sql sql) throws SQLException {
	        	double result=0.0;
	        	String resultStr=rs.getString("tem");
	        	result=Double.parseDouble(resultStr);
	        	return result;
	        }
		});
		
		nutDao.execute(sql);
		
		return sql.getDouble();
	}