package com.example.myapplication.model; import androidx.annotation.NonNull; import androidx.room.Entity; import androidx.room.PrimaryKey; @Entity(tableName = "turbines") public class Turbine { @PrimaryKey @NonNull public String turbineId; public String turbineName; public String projectId; @Override public String toString() { return turbineName +'('+ turbineId + ')'; } // 构造方法、getter/setter省略 }