| 摘要 |
The invention discloses a data organization method for a change oriented spreadsheet application. In one embodiment, the valid updates to cells and the update times are stored with the cell positions as the primary index, and the valid updates to the same cell are arranged in the order of time. In another embodiment, the valid updates to cells are stored with the update time points of the valid updates of the cells as the primary index, and all the valid updates at the same valid update time point are arranged into an update table, the update table having the same cell structure as the spreadsheet file. In yet another embodiment, data structures organized in both manners are maintained at the same time. |
