Android - sql查询group_by项目

Question

我正在创建android应用程序，其中用户输入一些收据和日志。关系是：Receipt has_many日志。

这是我的收据和日志模型。

@Table(name = "Logs") 
public class Logs extends Model { 
    @Column(name="PlateNumber") 
    String plate_number; 
    @Column(name="SortID") 
    String sort_id; 
    @Column(name="Grade") 
    String grade; 
    @Column(name = "Diametar") 
    double diameter; 
    @Column(name="Length") 
    double length; 
    @Column(name="CreatedAt") 
    Date createdAt; 
    @Column(name="Receipt") 
    Receipt receipt; 
    @Column(name = "Price") 
    Price price; 
} 


@Table(name = "Receipt") 
public class Receipt extends Model { 
    @Column(name="Place") 
    String place; 
    @Column(name="ShippingNumber") 
    String shippingNumber; 
    @Column(name="Warehouse") 
    String warehouse; 
    @Column(name="Carrier") 
    String carrier; 
    @Column(name="LicencePlate") 
    String licencePlate; 
    @Column(name = "Driver") 
    String driver; 
    @Column(name = "Customer") 
    String customer; 
    @Column(name= "DestWarehouse") 
    String destWarehouse; 
    @Column(name = "Employee") 
    String employee; 
    @Column(name = "PriceType") 
    String priceType; 
    @Column(name = "PriceCorrection") 
    Double priceCorrection; 
    @Column(name = "PriceCorrection2") 
    Double priceCorrection2; 
    @Column(name = "Supplier") 
    String supplier; 
    @Column(name = "CreatedAt") 
    Date createdAt; 
} 

这是我的活动，我试图做到这一点，但没有成功。

public class LogsRecapitulation extends AppCompatActivity { 

    private ListView mainListView; 
    private BaseAdapter listAdapter; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main_listview); 
     mainListView = (ListView) findViewById(R.id.ListViewItem); 

     //recieve RecepitID in displayLogs.activity 
     final long forwardedId = (long) getIntent().getExtras().get(String.valueOf("recepitID")); 
     List<Logs> logsList = new Select().from(Logs.class).where("Receipt = " + forwardedId).groupBy("SortID").execute(); // I grouped Logs by sortId in this line. 

     listAdapter = new RecapitulationArrayAdapter(logsList); 
     mainListView.setAdapter(listAdapter); 
    } 

    private class RecapitulationArrayAdapter extends BaseAdapter { 
     private LayoutInflater inflater; 
     private List<Logs> logsList; 

     public RecapitulationArrayAdapter(List<Logs> logsList) { 
      inflater = LayoutInflater.from(LogsRecapitulation.this); 
      this.logsList = logsList; 
     } 

     @Override 
     public int getCount() { 
      return logsList.size(); 
     } 

     @Override 
     public Object getItem(int position) { 
      return logsList.get(position); 
     } 

     @Override 
     public long getItemId(int position) { 
      return logsList.get(position).getId(); 
     } 

     @Override 
     public View getView(int position, View convertView, ViewGroup parent) { 
      if (convertView == null) { 
       convertView = inflater.inflate(R.layout.logs_recapitulation, parent, false); 
      } 
      Logs log = logsList.get(position); 
      ((TextView) convertView.findViewById(R.id.rec_log_sort)).setText(log.sort_id); 
      ((TextView) convertView.findViewById(R.id.rec_log_class)).setText(log.grade); 
      ((TextView) convertView.findViewById(R.id.rec_log_count)).setText(String.valueOf(logsList.size())); 
      ((TextView) convertView.findViewById(R.id.rec_logs_mass)).setText(String.format("%.2f m3", log.getM3())); 

      if (log.receipt.priceType.equals("Na panju")) { 
       ((TextView) convertView.findViewById(R.id.rec_log_price_default)).setText(String.valueOf(log.price.stumpPrice_kn)); 
      } else { 
       ((TextView) convertView.findViewById(R.id.rec_log_price_default)).setText(String.valueOf(log.price.roadPrice_kn)); 
      } 

      if (log.receipt.priceType.equals("Na panju")) { 
       ((TextView) convertView.findViewById(R.id.rec_calculated_price)).setText(String.format("%.2f KN", log.price.stumpPrice_kn * log.getM3())); 
      } else { 
       ((TextView) convertView.findViewById(R.id.rec_calculated_price)).setText(String.format("%.2f KN", log.price.roadPrice_kn * log.getM3())); 
      } 

      return convertView; 
     } 
    } 

} 

所以，就我目前所做的是，我通过sortID在此BaseAdapter显示日志，但在每个排序显示它的我的只有最后添加的日志，它的数据。

现在我需要显示像它在下面的图像 - 部分在哪里REKAPITULAT数据。在那里我需要通过sortID进行分组，然后在每种分类中我都需要进行分组。

例如，如果我喜欢带有4个日志的图像排序1，每个年级（A，B）2，那么它需要像图像一样显示它。

我被困在这里，我会非常感激，如果有人知道如何去做，并愿意帮助。

问题：如何创建sql查询或修复此问题我的代码显示数据就像上面的图像？

Answer 1

下面是一个例子查询与GROUP BY和JOIN使用ActiveAndroid：

new Select("SUM(Logs.Price)") 
    .from(Logs.class) 
    .join(Receipt.class) 
    .on("Receipt.Id = Logs.Receipt") 
    .groupBy("Logs.sortID") 
    .execute(); 

从这个查询，你会得到一个Log实例，因此你需要的SUM(Logs.Price)字段映射到一个有效的Log场如Price。例如：

new Select("SUM(Logs.Price) AS Logs.Price") 

该查询应该适合您的用例。