JPS63244445A - File management system - Google Patents

Abstract

PURPOSE:To prevent a file from being destroyed when a data output form is designated in error by discriminating whether or not a data exists on the data file, and outputting the data to the file depending on the result. CONSTITUTION:A file information management device 14 uses a table so as to manage files registered on a magnetic disk device 15 and searches a file information table 21 by using the inputted file name. A file discriminating device 16 gives a file name to a file management device 11 as information and when it is discriminated that no data is registered, the device 16 gives a command to a data input/output device 13 so as to output the data in a new data form and when the data is already registered, the device 16 gives a request to a parameter receiving device 17 so as to allow the device 17 to receive either new data form or an additional data form as a parameter. The parameter receiving device 17 displays the parameter on a parameter display device 18, receives the parameter and gives the result to a file presence discriminating device 16.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to file management, and more particularly to a method for determining data output format.

BACKGROUND ART Conventionally, when outputting data to a file using a utility or the like, a fixed data output format was given using a parameter.

Problems to be Solved by the Invention However, with the above-mentioned conventional fixed data output format, when outputting data, no check is performed to see if data exists on the file. There was a drawback that if a data output format was specified, the file would be destroyed.

The present invention has been made in view of the above-mentioned conventional situation,
Accordingly, an object of the present invention is to provide a new file management method that makes it possible to eliminate the above-mentioned drawbacks inherent in the conventional techniques.

Means for Solving the Problems In order to achieve the above object, the file management method according to the present invention includes a data presence/absence determination mechanism that determines the presence or absence of data in a file existing on a magnetic disk, and an external data creation format. The device is configured to include a parameter receiving mechanism input from an input device.

Embodiment Next, a preferred embodiment of the present invention will be specifically explained with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

Referring to FIG. 1, one embodiment of the present invention includes a file management mechanism l/ which is composed of a file information reading mechanism/co, a data input/output mechanism 13, a file information management mechanism III, and a magnetic disk device tS. , a file presence/absence determination mechanism/6, a parameter receiving mechanism/7, and a parameter display device/g.

FIG. 1 is a diagram showing an example of a file information table managed by the file management mechanism III.

Referring to Figure 1iJ2, the file information table / is composed of a file name -, an area start address 3, an area end address uF, and a final record registration address.

Next, to explain the operation of the present invention, the file information management mechanism /4' in the file management mechanism // manages files registered on the magnetic disk device IS using a table as shown in Figure 1. Then, input the file name from the file reading mechanism/co, search the file information table 2/ in Figure 1 using the input file name, and retrieve the information (area start address U, area end address, 2). , the final registered address 8) as the file reading mechanism/, 2
give it to

The file determination mechanism/6 passes the file name as information to the file management mechanism//, receives the file information table col, and compares the area start address n with the final record registration address 8. If they are equal, no data has been registered. , and instructs the data input/output mechanism/3 to output the data using the new data creation type, and if the data has already been registered, receives the new data creation type or additional data creation type as a parameter. A request is made to the parameter receiving mechanism 77 as follows. The parameter receiving mechanism/7 is
Parameter display device/Displays parameters, receives the parameters, and sends the results to file presence/absence determination mechanism/A
give it to

The file presence/absence determination mechanism/6 determines whether it is a new creation type or an additional data creation type based on the received parameters, and instructs the data input/output mechanism 73.

As described in detail, according to the present invention, it is possible to determine whether or not data exists in a data file, and to select a format for outputting data to a file based on the result. This has the advantage that it is not necessary to specify fixedly the data destruction described above and the format in which the data is created in a file.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG.
The figure shows an example of a file information table managed by a file management mechanism. l/... file management mechanism, /2... file information reading mechanism, 13... data input/output mechanism, /ri...
・File information management mechanism, 15...Magnetic disk device, 16...File presence/absence determination mechanism, /ri...Parameter receiving machine/za...Parameter display mechanism 1.2
/...File information table, n...File name,
3...Area start address, J'...Area end address, J...Last record registration address Patent applicant NEC Corporation Representative Patent attorney Yutabe Kumagai (G) Figure 2

Claims (1)

[Claims] An information processing system that connects a magnetic disk has a data presence/absence determination mechanism that determines the presence or absence of data in a file existing on the magnetic disk, a parameter receiving mechanism that inputs a data creation format from an external input device, and has a data output mechanism. A file management method characterized by automatically determining the format.