Jetpack之数据库——Room

Room是Jetpack提供的数据库框架，支持kotlin语言，支持Rxjava调用方式。

Room使用

1. 添加依赖

   dependencies {
         def room_version = "2.2.2"
         implementation "androidx.room:room-runtime:$room_version"
         // For Kotlin use kapt instead of annotationProcessor
         annotationProcessor "androidx.room:room-compiler:$room_version" 
       }
   

2. 定义数据表对应的实体类

   @Entity(tableName = "videoUpload")
   public class VideoUploadDBModel implements Serializable {
       @NonNull
       @PrimaryKey
       public String uuid;
       public String path;
       public Long size;
       public Integer status;
       public String userId;
   }
   

   必须要加@Entity注解
3. 定义数据表操作类

   @Dao
   interface VideoUploadDao {
       @Insert(onConflict = OnConflictStrategy.REPLACE)
       fun insert(videoUploadDBModel: VideoUploadDBModel)
   
       @Update(onConflict = OnConflictStrategy.REPLACE)
       fun update(videoUploadDBModel: VideoUploadDBModel)
   
       @Query("select * from videoUpload where uuid==:uuid")
       fun query(uuid: String): List<VideoUploadDBModel>
   
       @Query("select * from videoUpload")
       fun queryAll(): List<VideoUploadDBModel>
   
       @Query("delete from videoUpload where uuid==:uuid")
       fun delete(uuid: String)
   }
   

4. 定义数据库类

   	@Database(entities = [VideoUploadDBModel::class], version = 1)
   	abstract class VideoDatabase : RoomDatabase() {
   	    abstract fun videoUploadDao(): VideoUploadDao
   	}
   

5. 使用

   val database = Room.databaseBuilder(mContext, VideoDatabase::class.java, "fcat.db").build()
   val videoUploadList = database.videoUploadDao().queryAll()
   

来源：CSDN

作者：得食猫

链接：https://blog.csdn.net/github_34790294/article/details/104013766