我有一个返回5个值的结果集。我在POJO中设置了这些数据,并将pojo添加到列表中。
datapojo = new OutputViewDataPOJO();
datapojo.setTime(resultado.getInt(1));
datapojo.setCommandDesc(resultado.getString(2));
datapojo.setOkError(resultado.getString(3));
datapojo.setResultDesc(resultado.getString(4));
datapojo.setResultCode(resultado.getInt(5));
listPojo.add(datapojo);
[Description:Call connect, TimeStamp:0, OkError:OK, ResultCode:0, ResultDesc:null.]
[Description:Waiting open complete, TimeStamp:2468, OkError:OK, ResultCode:0, ResultDesc:null.]
[Description:Reading card, TimeStamp:0, OkError:OK, ResultCode:0, ResultDesc:null.]
[Description:Waiting read card, TimeStamp:10329, OkError:OK, ResultCode:0, ResultDesc:null.]
[Description:Reading card, TimeStamp:0, OkError:OK, ResultCode:0, ResultDesc:null.]
[Description:Waiting read card, TimeStamp:6671, OkError:OK, ResultCode:0, ResultDesc:null.]
[Description:Reading card, TimeStamp:0, OkError:OK, ResultCode:0, ResultDesc:null.]
[Description:Waiting read card, TimeStamp:6704, OkError:OK, ResultCode:0, ResultDesc:null.]
[Description:Reading card, TimeStamp:0, OkError:OK, ResultCode:0, ResultDesc:null.]
[Description:Waiting read card, TimeStamp:6578, OkError:OK, ResultCode:0, ResultDesc:null.]
[Description:Reading card, TimeStamp:0, OkError:OK, ResultCode:0, ResultDesc:null.]
[Description:Waiting read card, TimeStamp:6578, OkError:OK, ResultCode:0, ResultDesc:null.]
[Description:Reading card, TimeStamp:0, OkError:OK, ResultCode:0, ResultDesc:null.]
[Description:Waiting read card, TimeStamp:6594, OkError:OK, ResultCode:0, ResultDesc:null.]
顶部列出的数据打印在控制台中,现在我的问题是: 如何获取描述“等待读卡”的TimeStamp总和。我需要做一些统计,在这种情况下获取每个描述的timeStamp的媒体值,我不知道如何做到这一点。 拜托,帮助我!
答案 0 :(得分:1)
如果要将数据存储在数据库中然后检索,则需要使用这些列创建database
和table
(f.e。user
)
name -age -city -car model -house type
然后您可以存储数据( Insert into user(name, age, city, car_model, house_type) values (?,?,?,?,?)
并检索(Select * from user where city = 'Madrid'
)等。
您可以在一条评论中提及POJO实体:
public class User
{
private int id;
private String name;
private int age;
private String city;
private String carModel;
private String houseType;
//getters , setters
}
在数据库中创建相应的表格,并使用Insert
,Select
查询处理数据。
如果您不想将数据存储在数据库中,可以创建Map
以便于过滤。
f.e。
User user = ...; //an instance of User
Map<String, List<User>> userCityMap = new HashMap<String,List<User>>();
List<User> userWithThatCity = map.get(user.getCity());
if(userWithThatCity == null)
{
userWithThatCity = new ArrayList<User>();
userCityMap.put(user.getCity(), userWithThatCity);
}
userWithThatCity.add(user);
...
我希望这会有所帮助。