JPH0527947A - Annual guarantee method - Google Patents

Abstract

(57) [Summary] [Purpose] Even if the year is managed by the last two digits of the year in the data file, the current data file format ensures the year order even after the year 2000. [Structure] Before the judgment of the size of the year and the process of sorting and sorting,
The utility module 10 corresponding to the year 2000 is started. After that, the position in the record where the two digits below the year are stored in advance is designated by the external parameter 9, and the code indicating the year in the designated range is changed to another code so that the year order is maintained. replace.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention guarantees the order of ascending / descending in the size judgment and sort / margin processing by a program for a data file in which the last two digits of the Christian era are stored. The present invention relates to a year-based guarantee method corresponding to the year 2000.

[0002]

2. Description of the Related Art In a conventional computer system, a data file stores the last two digits of the year. Note that, regarding this type of technology, there are, for example, Japanese Patent Laid-Open No. 58-1229 and Japanese Patent Laid-Open No. 3-22117.

[0003]

The prior art described above does not consider the case after the year 2000, but manages the year by the last two digits of the year in the data file. for that reason,
In the year 2000 and thereafter, when the size determination process and the ascending / descending order process in the sort / marge process are performed in the normal year, the magnitude relationship is expressed by the equation 1.

[0004]

[Equation 1]

That is, although the year 2000 must be judged to be greater than the year 1999, only the last two digits of the year are used in the judgment, so 00 is less than 99. It is judged that it is smaller than 1999. As a method of solving this, it is conceivable to change the year to 4 digits, but in this case,
There is a problem that it is necessary to change the record length and block length of the data file, and the program is also modified.

The object of the present invention is to utilize the code system,
An object of the present invention is to provide a year-by-year guarantee method compatible with the year 2000 that can be used even after the year 2000 with the current data file format.

[0007]

To achieve the above object, in a computer system having a storage means and a processing section, the storage means stores the last two digits of the 1900s and 2000s. The processing unit replaces the tens digit code of the last two digits of the year with a code that maintains the order of the year.

[0008]

When the data representing the 1900s and 2000s are mixed, the code of the data representing the year is replaced with another code so that the year order is maintained. As a result, size determination and ascending / descending order processing are guaranteed.

[0009]

1 is a block diagram of a program according to an embodiment of the present invention.

Reference numeral 6 is a file in which data including the last two digits of the Western calendar is stored. 7 is a program. 8
Is a work area. 9 is a parameter. 10
Is a utility module corresponding to the year 2000.

Utility module compatible with the year 2000
Module 10 (hereinafter referred to as module 10) is program 7
It operates when specified by the utility or utility, and is positioned as a pre-process for the process of handling the year. Module 1
For 0, the range of the last two digits for code conversion is designated in advance. It replaces the numbers in the 2000s with the last two digits less than the lowest two digits in the 1900s. For example, if the year of the data in file 6 begins in 1973, the last two digits are 00 (2000) to 7
Convert up to 2 (2072). Since the present embodiment is an example of the case where the file 6 has data from 1960, the range is designated so that the code conversion is performed when the last two digits are 00 to 59. In this embodiment, the EBCDIC code is used as the code.

Next, the processing procedure will be described. First, the program 7 executes a process of calling the module 10 before the year determination. Then, the module 10 performs the following processing.

Parameter analysis processing 1: The parameter 9 given from the outside is input and the content is analyzed to recognize the work area name and the start position of the last two digits of the Christian era.

Work area input processing 2: Data is input from the work area name obtained in the parameter analysis processing 1.

Year determination processing 3: 2 bytes from the start position of the last two digits of the year in the record obtained by the parameter analysis processing 1 are determined, and when within a certain range, in this embodiment, from "00" to " In the case of the range of 59 ', the replacement process 4 is performed. Otherwise, enter the following data.

Replacement process 4: The tens digit of the last two digits of the Christian era in the record is replaced as shown in Table 1.

[0017]

[Table 1]

Work area output processing 5: The data subjected to the replacement processing 4 is output to the work area 8.

As shown in Table 1, by replacing the character code, the year 2000 is 20
It is judged that 2010 is larger than the 2000s.

In the present embodiment, the EBCDIK code is replaced with the code shown in Table 1 in the case of 2000 years or more. May be replaced with In this way, for example, if the file 6 has data from 1999, it is possible to support up to 2098.

[0021]

[Table 2]

In the case of less than 2000, X'F
It may be replaced with the code used, such as 0 '→ X'C0'.

In the case of the 2000s, X'F0 '
→ X'C0 'and X'F0' in the 1900s →
It may be replaced with X'B0 '. That is, both 2000s and 1900s may be replaced with other codes.

The character code used may be JIS code, ASCII code, or the like. In other words, when judging the magnitude relation of the year, the code may be replaced so that the judgment can be performed normally.

[0025]

[Effects of the Invention] By replacing the code so that the magnitude relation of the year can be judged normally, the record length and block length of the data file are not changed, and the year order is changed without modifying the program. It has the effect of being guaranteed.

[0026]

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a program.

[Explanation of symbols]

1 ... Parameter analysis processing, 2 ... Work area input processing, 3
... Year determination process, 4 ... Replacement process, 5 ... Work area output process, 6 ... File, 7 ... Program, 8 ... Work area, 9 ... Parameter, 10 ... Year 2000 compatible utility module.

Claims (1)

Claims: What is claimed is: 1. A computer system having a storage means and a processing section, wherein the storage means stores 1900's and 200's.
When the last two digits of the year 0 are stored, the processing unit replaces the tens code of the last two digits of the year with a code that maintains the order of the year. Method.