room

https://developer.android.com/training/data-storage/room

Room

https://codelabs.developers.google.com/codelabs/android-room-with-a-view/#0

https://codelabs.developers.google.com/codelabs/android-room-with-a-view-kotlin/#0

kotlin need familiar [basic coroutines](

数据库基本操作

• 主键

  每个实体必须定义至少1个字段作为主键。即使只有1个字段，仍然需要用@PrimaryKey注解字段。此外，如果您想Room自动分配IDs给实体，则可以设置@PrimaryKey的autoGenerate属性。如果实体具有复合主键，则可以使用@Entity注解的primaryKeys属性

• Entity

  @Entity
  public class BleData {
      @PrimaryKey
      public int id;
  
      public long createDttm;
      public String bleParam;
  }

• Dao

https://developer.android.com/topic/libraries/architecture/room

https://github.com/googlecodelabs/android-room-with-a-view

https://codelabs.developers.google.com/codelabs/android-room-with-a-view/#0

https://github.com/googlecodelabs/android-room-with-a-view/tree/kotlin

https://blog.skymxc.com/2018/04/15/Room/

https://www.jianshu.com/p/0ed8b17a199e

索引为什么加快访问速度

数据库迁移

https://www.jianshu.com/p/72eeaded8913

https://blog.csdn.net/a254837127/article/details/84564545

https://developer.android.com/training/data-storage/room#java

https://codelabs.developers.google.com/codelabs/kotlin-coroutines/#0)