sql结果:
data_type datatypename
G 大气成分
J 雷达
M 产品
E 农气
A 地面
B 高空

代码

@At
	@Ok("json")
	/*
	 * select distinct fault.data_type,
	 * stationtype.datatypename from t_fault_total fault 
	 * inner join t_stationtype stationtype on 
	 * fault.data_type=stationtype.datatype;
	 */
	public List<String> getFaultBigTypes() {
		String sqlStr="select distinct fault.data_type,"+
				"stationtype.datatypename from t_fault_total fault "+ 
				"inner join t_stationtype stationtype on "+ 
				"fault.data_type=stationtype.datatype";
		
		Sql sql = Sqls.create(sqlStr);
		
		sql.setCallback(new SqlCallback() {
	        public Object invoke(Connection conn, ResultSet rs, Sql sql) throws SQLException {
	            List<String> list = new LinkedList<String>();
	            while (rs.next())
	                list.add(rs.getString("data_type"));
	            	list.add(rs.getString("datatypename"));
	            return list;
	        }
	    });
		
		return sql.getList(String.class);
	}

返回null