JPS63167942A - File control system - Google Patents

Abstract

PURPOSE:To add a file without stopping the whole, by executing an input and output to the file by referring to control information in a file control table, and updating the contents of the table by the latest information. CONSTITUTION:When a user 18 executes an access to a file 16, when a re-access starting means 12 is started, the means 12 starts a file access means 14 and executes an access to the file 16, based on control information registered in a file control table 17. A file control table changing means 13 reads file information which becomes an object, from a data base management file 11, and stored its information in an unused area in the table 17. Subsequently, the means 12 requests the re-execution of an access, to the means 14. The means executes an access to the added file again, while referring to the changed file control information. In such a way, the user 18 can use the file to be used, by only registering it in the file 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a file control system in a database system.

[Conventional technology]

Part 4 about file control systems using conventional technology
This will be explained using figures.

FIG. 4 is a diagram showing an outline of a conventional file control system, in which 11 is a database management file, 14 is a file access means, 15 is a database consisting of a plurality of files 16, and 17 is a file control table.

In a conventional file control system, a file control table 1 is created based on control information of a plurality of files 16 of a database 15 stored in a database management file 11.
File control information is registered on the computer 7, and the file access means 14 inputs and outputs files based on this information. Further, when adding a file, the information is not reflected in the file control table 17, so the file cannot be added at any time.

[Problem that the invention seeks to solve]

In the conventional file control system described above, when attempting to add a file to a database, the file control table for the entire database must be released and the file control table must be created again.
This is because the contents of the file control table cannot be changed for each file, so even if a file is added, the information about that file cannot be reflected in the file control table.

Recreating the file control table for the entire database is a big problem because it means stopping database access. Furthermore, since the file control table is not automatically re-created by the system, but must be done consciously by the user, this has a significant impact on operations.

SUMMARY OF THE INVENTION An object of the present invention is to provide an aisle control system that eliminates the above problems with a simple configuration and allows files to be added at any time without stopping the entire database access.

[Means for solving problems]

The configuration of the present invention includes a plurality of files storing data,
Create a database management file that stores control information for these multiple files, and create a file control system based on the control information for the multiple files stored in this database management file to manage input/output to the multiple files. In the file control system, the file access means performs input/output to the plurality of files by referring to the control information in the file control table; file control table changing means for updating the contents of the file control table based on file information; and re-access starting means for starting the file control table changing means and the file access means, so that files can be added at any time. It is characterized by what it can do.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a diagram showing an overview of an embodiment of the file control system of the present invention, which includes a database management file 11, re-access starting means 12, file control table changing means 13, and file access means 14. , a database 15 consisting of a plurality of files 16, and a file control table]7.

FIG. 2 is a flowchart showing the operation flow of the re-access activation means 12 of FIG. 1.

FIG. 3 is a configuration diagram of a file control table used when accessing a file.

When the user 18 of the system of this embodiment accesses the file 16, the re-access activation means 12 is activated. The re-access activation means 12 is the file access means 1
4, the file 16 is accessed based on the file control information 32 registered in the file control table 31. If the file information regarding the file to be accessed is not registered in the file control table 31, the file access means 14 returns an error to the re-access activation means 12.

Next, determine the execution result of the file access means 14,
It is determined whether or not there is an abnormality regarding the file information (step 21 in FIG. 2).

As a result, if an abnormality related to file information is detected, the file control table changing means 13 is activated in order to register the file information in the file control table for the file in which the abnormality has been detected (step 22 in FIG. 2).
.

The file control table changing means 13 reads target file information from the database management file 11 and stores the information in an unused area 33 in the file control table 31.

At this time, if the information of the target file does not exist in the database management file 11, the process is terminated (second
Figure step 23).

Next, the re-access activation means 12 requests the file access means 14 to re-execute the access (step 24 in FIG. 2).

The file access means 14 accesses the re-added file while referring to the changed file control information.

As a result, the system user 18 can select the file he or she wants to use from the database management file 11 at any time.
You can use this file simply by registering it.

〔Effect of the invention〕

By using the aforementioned file control system, system users can register information about the files they want to use in the database management file at any time.
When a request to access this file occurs,
Since the system automatically changes the file control table information, files can be added without stopping the entire database access.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an overview of the system of an embodiment of the file control system of the present invention, FIG. 2 is a flowchart showing the operation flow of the re-access starting means 12 of FIG. 1, and FIG. FIG. 4 is a block diagram of a conventional file control system. DESCRIPTION OF SYMBOLS 11... Database management file, 12... Re-access starting means, 13... File control table changing means, 14... File access means, ]5... Database, 16... File, 17. ...File control table, 18...Database user, 32
...Information on already registered files, 33...
Area for registering additional files.

Claims (1)

[Claims] A file control system is created based on multiple files that store data, a database management file that stores control information for these multiple files, and the control information for the multiple files stored in this database management file. In a file control system that manages input/output to the plurality of files, the file access means performs input/output to the plurality of files by referring to control information in the file control table; file control table changing means for extracting file information and updating the contents of the file control table based on the latest information on the plurality of files; and re-access starting means for starting the file control table changing means and the file access means. A file control system characterized by the ability to add files at any time.