JPS6167123A - File access control method - Google Patents

Abstract

PURPOSE:To access a data file having a complicated key element by synthesizing data of all key elements to one when data of all key elements are arranged and using the result so as to read a specific data record to a main storage device. CONSTITUTION:A data input from a CRT screen is executed with respect to a field information entry 111 inputted at first to a field information table 11. Since a timing field pointer 121 is not idle and a key element 1921 of a file 152 is attained, an input discrimination flag 1A21 is set. Since the next timing field information point 1B21 is not idle and a key element 1912 of the file 151 is set, the input discrimination flag 1A12 is set. When all the flags are set in this way, the data of the key elements are synthesized by a corresponding key information table 18, a specific data code of an external storage device is read in a main storage device and the content of the data code is displayed on a CRT screen.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a file access control method for reading data records from an external storage device onto a main storage device.

Conventional technology Conventionally, in this type of file access control method, there is a one-to-one correspondence between one field pressed on a keyboard and the key field of a data record in an external storage device, so the data record access method is Although it is easy, the scope of application is narrow and lacks flexibility.

For example, when a product code (100) is input from the keyboard, a data record on a product master file with code 100 as a key is read, and the product name is displayed on a CRT.

Problems to be Solved by the Invention However, when a data record is accessed by inputting a key from the keyboard and using multiple fields as one key, field data on any side of the multiple fields may be a constant or operation other than the data given from the keyboard. When accessing a data record using results or the contents of other cheater records as a key, you cannot control when multiple field data is combined into one field or when the data record is accessed. . This has the disadvantage that data files with complex key elements cannot be accessed.

The purpose of the present invention is to eliminate the above-mentioned drawbacks, to make it possible to determine whether all the data of all key elements are complete, to combine the data of all key elements into one when the data is complete, and to combine it into one data. An object of the present invention is to provide a file access control method that makes it possible to read a specific data record into a main storage device as a key.

Means for Solving the Problems The method of the present invention reads a data record from an external storage device into the main storage device using data entered from a keyboard as a key, and displays the contents of the cheetah record on a data display device. In a file access control method for a computer system capable of , a combination of the keystroke data and the calculation result processed by the program is used as a key, a combination of the data and the contents of the Cheetah record already read into the main storage device is used as the key, and a Cheetah record existing in the external storage device is used. The first step is to determine whether all the keys to read the data into the main memory have been prepared, and when they have been obtained, the multiple key data are combined into one, and the desired data record is immediately transferred to the main memory. A second step of reading the data into

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

Referring to FIG. 1, the table of the main memory in one embodiment of the present invention includes a field information pointer 10, a field information table 11, an l field information entry lli, a timing field pointer 12i,
File information pointer 14 and file information table 1
5, 1 file information entry 15j, corresponding key information pointer 16j, timing field information pointer 17j, corresponding key information table 18j, l corresponding key information entry 18jz, timing field information table 19J, l timing field information en IJ
19jz, an input determination flag IAjz, and a NEXT timing field information pointer 1Bjz.

The address of the field information pointer 11 is stored in the field information pointer 10 as indicated by the solid arrow ■. The address of the file information table 15 is stored in the file information pointer 14 as indicated by the solid arrow ■. The address of the corresponding key information table 18j is stored in the corresponding key information pointer 16j, as indicated by the solid arrow ■.

The timing field information pointer 17J is a solid arrow ■
As shown in the tiling field information table 19j
address is stored. The address of one timing field information entry is stored in the timing field pointer 12j, as indicated by a one-dot broken line ■. N
The address of 1 timing field information entry 19jz is stored in the EXT timing field information pointer 1Bjz, as indicated by the dotted line ■.

The field information table 11 includes i fields, which are input/output on a data display device (hereinafter referred to as CRT) screen.
It has detailed information regarding each field, that is, one field information entry 111.

The file information table 15 stores information about each file for the number j of files to be input/output, that is, 1
It has a file information entry 15j.

The corresponding key information table 18j includes information on which field is to be combined to create a key for accessing a file, the number of elements forming the key (two), information on the key elements,
That is, it has one corresponding key information entry 18jz.

The timing field information table 19j includes information for knowing that the data of the key element is input from the keyboard or that the data of the key element has already been given in some way, that is, an input determination flag I A j 2;
Information to know if a certain key element is a key element for accessing other files,
That is, NEXT timing field information pointer I
Has Bjz.

Next, the flowchart shown in FIG. 2 will be explained.

FIG. 2 shows the processing procedure from inputting one field using the keyboard on the CRT screen to displaying file data on the 081 screen.

Each box will be explained with reference to FIG.

First, in BOX 20, one field is input. Regarding the field information entry lit entered first in the field information table 11, data is input from the CRT screen. Next, in BOX21, since the timing field pointer 121 is not empty, that is, the key element 19□ of the file 152, the input determination flag lA21 is turned on. Since the NEXT timing field information pointer 113si is also not empty, that is, it is also the key element 1912 of the file 151,
The input determination flag IAtt is turned on. Similarly I B1
Following the pointer 2, the input determination flag is turned on until it becomes empty. When the NEXT timing field information pointer becomes empty, go to the next judgment boxu. BOX
22, first, the input determination flag IAIL of the first timing field information entry 1 '1ltt of the timing field information table 191 is set for file 15+.
It is checked in order from I Al1 + --- + l A 111 whether the flag is on or not. If all the flags are on, the process goes to B'0X23, but if even one is off, the same determination is made for the next file 152, and the same process is repeated until the last file 15j. When all the input determination flags are on for file 15xK, which is in the middle of the process, the process goes to BOX23. B.O.
In X23, key data is synthesized from the corresponding key information table 18x, in BOX24, a specific data code of the external storage device is read into the main storage device, and in BOX25, the contents of the data record are displayed on the CR, T screen. This completes the input for the first input field IIl, and similarly the next input field 11! The same process is performed for .

This series of processing is repeated until the last input field 111.

Effects of the Invention The present invention has the advantage that by associating the field information table 11 with the file information table 19, files using complex key elements as keys can be accessed.

[Brief explanation of the drawing]

FIG. 1 is a table-related diagram showing an embodiment of the present invention, and FIG. 2 is a flowchart showing the processing procedure from inputting one field using the keyboard to displaying data on a file on a CRT screen. It is. In FIGS. 1 and 2, 10...°° field information pointer, 11... field information table, xxi...1 field information end 1
c12i...timing field pointer,
14...File information pointer, 15 pa°°・
°File information table, 15j...1 file information/to1c16j-°°"...Corresponding key information pointer, 17j...°...Timing field information pointer, 18j... ...Corresponding key information table,
18jz...1 compatible key information technology: /1,19j
...Timing field information table, 19
．． iz・pa・°1 timing field information end 1
C IAjz...Input judgment flag, 1Bj
z...NEXT timing field information pointer.

Claims (1)

[Claims] A file access control method for a computer system that stores a data record from an external storage device into the main storage device using data entered from a keyboard as a key, and displays the contents of the data record on a data display device. The key is a field consisting of one continuous character string pressed by the key, or data made by connecting multiple fields, and the data fixedly given by the program is combined into one key, and the program performs calculations. The result of the keystroke and the above-mentioned keystroke data are combined into one key, and only a part of the contents of the data record that has already been read into the main memory is used as the key, or a part of the data record and any of the above are used as the key. Combined with the data obtained by
In the case of two keys, the first step is to determine whether the data elements constituting the key for reading the data record from the external storage device into the main storage device are complete, and the first step is to determine whether the data elements constituting the key for reading the data record from the external storage device into the main storage device are complete. In order to make it possible to read the desired data record into the main memory at the determined time, each field information entry for the field entered from the keyboard in the field information table is a key element for accessing the file. The input judgment flag of the timing field information entry in the key information table connected from the file information table pointed to by the file information table is checked every time one field is input, from the file information table side, it is judged whether everything is complete. A file access control method characterized by comprising the step of: