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在之前的Room版本中，如果在dao 中 使用@update 会更新关联的主键数据的那一行的所有数据
但是在 androidx.room:room-*:2.2.0 之后，我们可以做到部分更新
官方解释如下
目标实体：DAO 注释 @Insert、@Update 和 @Delete 现在具有一个新属性 targetEntity，可用于指定要采用 DAO
方法的目标表。这样一来，这些 DAO 方法的参数就可以是任意 POJO，这些 POJO 将被解释为部分实体。实际上，这允许部分插入、删除和更新
举例如下：
@Entity class FriendRequest ( @PrimaryKey @NotNull val fromUserName: String )
{ var toUserName = "" var userFaceUrl = "" var userSex = 1 var
userSelfSignature = "" var userBirthday = "" var notes = "" var addTime = 0L
var status = STATUS_VERIFY_NONE } data class FriendRequestStatus(val
fromUserName: String, val status: Int) data class FriendRequestProfile(val
fromUserName: String, val userFaceUrl: String, val userSex:Int, val
userSelfSignature: String, val userBirthday: String) @Dao interface
FriendRequestDao { @Insert(onConflict = OnConflictStrategy.REPLACE) fun
insert(vararg friendRequestRequest: FriendRequest) @Update fun update(vararg
friendRequestRequest: FriendRequest) @Update(entity = FriendRequest::class) fun
updateStatus(vararg status: FriendRequestStatus) @Update(entity =
FriendRequest::class) fun updateProfile(vararg profile: FriendRequestProfile) }
只要确保entity中传入的类的属性，包含了FriendRequest类的主键以及想要修改的值（属性名字需与FriendReques类一致）即可
