Question

我正在创建Android应用，用户输入一些收据和日志。关系是：收据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，我正在努力实现这一目标，但未成功。

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，到目前为止我所做的是我在这个BaseAdapter中按sortID显示日志，但在每种类型中它都显示我最后添加的日志及其数据。

现在我需要在下面的图像上显示数据 - 部分在哪里是REKAPITULAT。在那里我需要按sortID分组，然后在每种类型中我需要按等级对它们进行分组。

例如，如果我喜欢图像排序1有4个日志，每个等级2个（A，B）那么它需要像图像一样显示它。

我被困在这里，如果有人知道怎么做并且愿意提供帮助，我将非常感激。

问题：如何创建SQL查询或修复此代码以显示上面图像上的数据？

Answer 1

以下是使用ActiveAndroid GROUP BY和JOIN的示例查询：

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

通过此查询，您将获得Log个实例，因此您需要将SUM(Logs.Price)字段映射到有效的Log字段，例如{ {1}}。例如：

Price

查询应根据您的用例进行调整。

Android - 用于group_by项目的SQL查询

1 个答案: