| 摘要 |
PURPOSE:To prevent the conflict caused by a misoperation between the file contents and the control information by performing the replacement processing to an original file with reference to a correspondence table, erasing both the original file and the replacement history control information when the replacement processing is through, and replacing the original with a copy. CONSTITUTION:A tentative file 8 containing a copy of a designated original file 6 and the tentative control information 9 containing an original control information 7 of the file 6 are produced by the replacement request of a user. Then the corresponding information 5 between both files 6 and 8 is set by an open processing part 2. A replacement processing part 3 retrieves the information 5 by a replacement instruction to decide the file 8 and carries out the replacement processing for the file 8 and the information 9. A closing action processing part 4 erases the file 6 and the information 7 by a replacement ending instruction and replaces the files 6 and the information 7 with the file 8 and the information 9 respectively. In such a constitution, the conflict caused by a misoperation between the file contents and the control information can be eliminated. |
