用于存储最新值和历史记录表的 SQL Server 存储过程

Question

正在寻找一种方法来做到这一点是 SQL Server

表 1 - Status_Latest

DeviceID Status(bit) TimeOfUpdate(datetime)

表 2 - Status_History

DeviceID Status(bit) TimeOfUpdate(datetime)

寻找最快的实现方式：

调用存储过程，传递DeviceID 和状态。

如果Status_Latest 中不存在DeviceID，请同时插入Status_Latest 和Status_History

如果值与Status_Latest 中的当前值不同，请更新它 并存储到Status_History

我在想

选项 A：如果值不同，我可以从 Status_Latest 中进行选择，然后更新 Status_Latest 和 Status_History。

选项 B：我可以在存储旧值的同时更新 Status_Latest？ 如果值不同更新Status_Latest 和Status_History

到目前为止我所拥有的（仅在应用程序更改时调用，需要在 DB 存储过程中处理）

insert into [SensorStateChange_History] (SensorIndex, SensorOccupied, TimeOfDataBaseStorage)
values (@SensorIndex, @SensorOccupied, GETUTCDATE())

update SensorState_Latest
set SensorOccupied = @SensorOccupied, 
    TimeOfDataBaseStorage = GETUTCDATE()
and SensorIndex = @SensorIndex

if @@ROWCOUNT = 0

insert into SensorState_Latest
values (@SensorIndex, @SensorOccupied, GETUTCDATE())

Answer 1

我会这样做：

IF NOT EXISTS(SELECT * FROM [SensorStateChange_Latest] WHERE SensorIndex=@SensorIndex AND SensorOccupied=@SensorOccupied)
  BEGIN
  update SensorState_Latest
  set SensorOccupied = @SensorOccupied, 
    TimeOfDataBaseStorage = GETUTCDATE()
  WHERE SensorIndex = @SensorIndex;    

  if @@ROWCOUNT = 0    
    insert into SensorState_Latest
    values (@SensorIndex, @SensorOccupied, GETUTCDATE())

  insert into [SensorStateChange_History] (SensorIndex, SensorOccupied, TimeOfDataBaseStorage)
  values (@SensorIndex, @SensorOccupied, GETUTCDATE());

  END