android studio 访问数据库 访问下载编号 输入上传编号 代码

在Android Studio中访问SQLite数据库并操作编号，通常需要以下几个步骤：

1. **添加依赖**：
首先，在`build.gradle(Module)`文件中添加对SQLite支持的依赖：

   implementation 'androidx.room:room-runtime:2.4.0'
   annotationProcessor 'androidx.room:room-compiler:2.4.0'

2. **创建数据模型** (Entity)：
创建一个包含编号字段的数据实体，例如：

   import androidx.room.Entity;
   import androidx.room.PrimaryKey;

   @Entity(tableName = "your_table_name")
   public class YourModel {
       @PrimaryKey(autoGenerate = true)
       private int id;
       private String uploadId;
       private String downloadId;

       // Getters and setters
   }

3. **数据库助手** (Database Helper):
定义一个Room Database助手类，继承自`RoomDatabase`：

   import androidx.room.Database;
   import androidx.room.RoomDatabase;

   @Database(entities = {YourModel.class}, version = 1)
   abstract class YourDatabase extends RoomDatabase {
       abstract YourModelDao yourModelDao();
       // DAO (Data Access Object) interface for database operations
   }

4. **DAO Interface** (Data Access Object):
编写DAO接口用于CRUD操作，比如获取、插入、更新和删除记录：

   import androidx.room.Dao;
   import androidx.room.Insert;
   import androidx.room.Query;

   @Dao
   public interface YourModelDao {
       @Insert
       void insert(YourModel model);

       @Query("SELECT * FROM your_table_name WHERE download_id = :downloadId OR upload_id = :uploadId")
       List<YourModel> getByUploadOrDownloadId(String uploadId, String downloadId);
   }

5. **实际使用**：
在需要的地方注入数据库，并执行操作：

   YourDatabase db = Room.databaseBuilder(getBaseContext(), YourDatabase.class, "your_database_name").build();
   YourModel model = new YourModel();
   model.setUploadId(uploadId); // 或者model.setDownloadId(downloadId);
   db.yourModelDao().insert(model);

   List<YourModel> models = db.yourModelDao().getByUploadOrDownloadId(uploadId, downloadId);