JPS5919378B2 - Data update control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a data update control method, particularly a method for controlling data update using a plurality of input devices (
A data update control method that manages data that is randomly updated from input/output devices (including input/output devices), and allows correct restoration by simply issuing a cancellation instruction even if the updated data that has been input contains an error and needs to be canceled. It is related to.

For example, by input devices such as keyboards and printers,
A report is created that shows the product name, sales quantity, and sales amount as a result of multiplying the unit price. That is, when an operator inputs key data corresponding to the name of a sold product using a keyboard/printer, the product code and product name are printed on the form by the printer, and then when the operator inputs the sales quantity. The printer prints out the quantity on the book and also prints out the sales amount. In this case, the master file side manages the number of items in stock in accordance with the sales. If there are multiple keyboard printers as described above, and the operator inputs the above sales quantity incorrectly while each keyboard printer is operating randomly, the above inventory This can easily cause serious confusion in number management.

In consideration of the above points, the present invention aims to enable an operator who has made an error to restore the system correctly by simply instructing cancel. Therefore, the data update control method of the present invention includes a master file that stores information in units of blocks consisting of a plurality of records, and a control method for reading information from the master file or writing information to the master file. In a control system having a plurality of input devices capable of inputting at least key data corresponding to the record unit, update data for the key data, and a cancel instruction for canceling the update data, the control device an information storage section having a data area, a read stack area, a key save area, and a rewrite stack area corresponding to each input device, and when the key data is given from the one input device; The contents of the record unit corresponding to the key data are set in the data area, the contents of the updatable data in the record unit are set in the read stack area, and the update data is given from the input device. When the amount of change between the contents of the read stack area and the updatable data after being updated by the update data is set in the rewrite stack area, and the cancel instruction is given from the input device. and restoring the contents of the data area to the state before the update by the update data using the updated updatable data and the contents of the rewrite stack area;
It is characterized in that it is stored in the master file. This will be explained below with reference to the drawings. The figure shows an embodiment of a system for carrying out the method of the invention.

In the figure, 1 is the master file, 2 is the control device, 3-1,
3-2, . . . , 3-n are each a keyboard/printer,
4 is an input/output buffer, 5 is an arithmetic unit, 6-1, 6-2, .
... are buffer areas corresponding to the keyboard and printer, respectively, 1-1, 7-2 are data areas, 8-1, 8-2, respectively.
are the read stack areas, 9-1, 9-2, 11-, respectively.
1, 11-2, 13-1, 13-2 are key save areas, 10-1, 10-2, 12-1, 12-2, 14
-1 and 14-2 each represent a rewrite stack area, and 15 represents an example of a form printed out by the keyboard printer. In the input/output buffer 4 of the control device 2, buffer areas 6-1, 6-2, . . . are provided in one-to-one correspondence with, for example, each keyboard and printer.

Each buffer area has a data area 1, a read stack area 8, key save areas 9, 11, 13, . . . rewrite stack areas 10, 12, 14, . Note that the data areas 7-1, 7-2, . . .
corresponds to each buffer area 6-1, 6-2;... In other words, each keyboard/printer 3-1, 3-2...
At least one record is created corresponding to the key data entered from the keyboard/printer, such as record YA corresponding to product code A, which is read from master file 1 and temporarily held.

7j Each record is composed of a set of data such as (I product code, (6) product name, (goods) inventory amount, and (to) unit price, and the inventory amount of product code A is If there are currently 100 pieces and the unit price is 500 yen,
As mentioned above, record YA read from master file 1 based on product code A and held in data area 7-1 has contents such as "A, ****, 100, 500". .

The read stack areas 8-1, 8-2, etc. have at least one record stored in the data areas 7-1, 7-2, and so on corresponding to each keyboard/printer. It temporarily holds updatable data in the data.

In the above example, the inventory amount in record YA is “100”.
” is read stack area 8-1 as updatable data.
is maintained. Note that updatable data may be considered to be data that can be updated, such as quantitative data. The above key save area 9-1, 9-2..., 11-
1, 11-2..., 13-1, 13-2... are created in plural numbers corresponding to each keyboard/printer 3-1, 3-2..., and are input from the keyboard/printer. It holds each key data.

Furthermore, rewrite stack areas 10-1, 10-2...
, 12-1, 12-2..., 14-1, 14-2...
A plurality of . . It is obtained by a one-to-l correspondence. The key save areas 9, 11, 13... and the rewrite stack areas 10, 12, 14... are as follows:
This saves how many records the previous update was made to. For example, if a quantity of ``10'' is sold for a product with product code A, the product code "
A" is saved and rewrite stack area 10-1
The sales quantity "10" is saved within. In addition, each keyboard/printer 3-1, 3-2, . . . , 3-n independently issues, for example, a read instruction, a rewrite instruction, and a cancel instruction. It allows you to enter data etc.

(1) Now, for example, in one keyboard printer 3-1, when the operator inputs key data A corresponding to the name of a sold product, the key data becomes a read instruction as it is, and the key save in the control device 2 It is set within area 9-1. (2) The control device 2 is equipped with a stored program processing function, and the above key save area 9
Based on the contents A of 11, a read access is made to the master file 1 in order to read the record YA corresponding to the key data A. (3) Master O file 1
In this control, duplicate reading is prohibited for the block unit containing the record YA, and the record YA is set in the zeta area 7-1. (4) In the control device 2, updatable data such as inventory amount data such as inventory amount "100" in the record YA is also set in the read stack area 8-1.

(5) When the operator inputs key data A through the above process (1), the keyboard O printer 3-1
In this case, the printer is working and the product code A is printed on form 15.
, and by the above process (3), the record YA
is set in the data area 7-1, the product name is transmitted from the control device 2 to the keyboard/printer 3-1, and the product name *** is printed on the form 15.

(6) With this, the operator can then update the update data ΔX
AFor example, input the sales quantity "10".

In the keyboard O printer 3-1, the quantity "10" is printed on the form 15.The input of the above-mentioned update data is directly transmitted to the control device 2 as a write instruction. (
7) The control device 2 multiplies the unit price 4 in the contents (YA) of the data area 7-1 by the sales quantity "10" and transmits this result to the keyboard printer 3-1.

(8) As a result, the sales amount is printed on the form 15 by the keyboard/printer 3-1.

(9) Along with the above process (7), the control device 2 subtracts the inventory amount data in the data area contents (YA) by the quantity "10" to, for example, "90", and uses the result, that is, the updated result, as the master.・Write to file 1. In αO master O file 1, cancel the inhibited state previously performed in process 3, and read the record in the block using another keyboard O printer. Try to forgive.

AD In addition to the above process (9), the control device 2 also performs the process (
In step 4), subtract the updated inventory amount "90" from the inventory amount "100" set in the read stack area 8-1, and set the result "10" to the rewrite stack area 10-1. Set inside.

That is, the result ``10'' is set in the rewrite stack area 10-1 corresponding to the key 0 save area 9-1, so that a cancel instruction that may occur next can be dealt with.

5. If the operator discovers that there is an error in the update data input in the above process (6), for example, the sales quantity "10", the operator inputs a cancellation.

The cancel becomes a cancel instruction and is notified to the control device 2. Upon receiving the cancel instruction, the αa control device 2 performs read access to the master file 1 based on the content A of the key save area 9-1.
α◆ In the master file 1, it is prohibited that the information in units of blocks including the record specified by the content A is read out redundantly.

Then, the information of the record unit YA is set in the data area 7-1 in No. 2. Ae The inventory amount data in the set record unit information is processed by the above process (
9) If the information for each record has not been updated by another keyboard O printer since the time when the record unit information was stored by α0, the value “90” as stored above is shown. αO Also, if the value “20” has been further subtracted by the update data from another keyboard O printer, the information of the record unit YA set in the data area 7-1 by the above process α◆ is The inventory data in the report shows a value of "70". αη With the information of the record unit YA set in the data area 7-1 by the above process a◆, the control device 2 reads the updatable data including the inventory amount data etc. in the information and stores it in the stack area 8-1. 1
Needless to say, it should be set within 5. αe and
The control device 2 adds the content of the rewrite stack area 10-1, that is, the value "10" set in the above process AD, to the content (YA) of the data area 7-1.

That is, as a result of this, in the case of Ae, the inventory amount data is restored to the value "100" (=100-10+10).
In addition, the above a combination, the inventory amount data is the value "80" (=10
0-10-20+10) (20 characters have been subtracted by 4 due to other keyboard printers, so 8
0 is correct). σ9 The information of the record unit YA restored by the above process (c) is stored in the master file 1 again.
written to.

Then, the prohibited state caused by the above process (existence) is canceled. 1 In this state, when the operator inputs the key 0 data A again, the processes starting from the above process (1) are performed.

(It goes without saying that when the operator 20 inputs other key data B, the information of the record unit YB corresponding to the key data B is set in the data area 7-1.

5. In some cases, after the operator has made inputs for a plurality of products, that is, after creating the form 15, for example, he or she may realize that there is an error in the quantity entered for key data A, etc. There is.

In this case, the operator issues a cancel instruction to cancel the entire form. (C) In this case, it is assumed that the control device 2 sequentially performs the operations of the above-mentioned processes α3 to A9 for each key save area 9-1, 11-1, 13-1, etc. good.

As explained above, in the case of the present invention, even if a plurality of input devices are operating independently and randomly, an operator who makes an error can simply issue a cancel instruction immediately or after creating a form. , the correct information will be restored.

Therefore, the operator only needs to issue a cancel instruction without being aware of update data input by mistake or update data input in the meantime from other input devices. This makes it possible to eliminate the financial burden. Furthermore, by employing the method of the present invention, it is possible to shorten the period during which data is prohibited from being used, and the throughput of the entire system is increased.

[Brief explanation of the drawing]

The figure shows an embodiment of a system for carrying out the method of the invention. In the figure, 1 is the master file, 2 is the control device, 3-1,
3-2, . . . are keyboard/printer, 5 is a calculation unit, 6-1, 6-2, . . . are buffer areas, 7-1, respectively.
, 7-2 are data areas, 8-1, 8-2 are read stack areas, 9-1, 9-2, 11-1, 11-
2, 13-1, 13-2 are key save areas, 10
-1,10-2,12-1,12-2,14-1,14
-2 represents a rewrite stack area, and 15 represents a form.

Claims (1)

[Claims] 1. A master file that stores information in blocks consisting of a plurality of records, a control device that reads information from the master file or writes information to the master file, and at least the above-mentioned control device. In a control system having a plurality of input devices capable of inputting key data corresponding to a record unit, update data for the key data, and a cancellation instruction for canceling the update data, the control device inputs a plurality of input devices to each of the input devices. an information storage section having a data area, a read stack area, a key save area, and a rewrite stack area;
When the key data is given from the one input device, the contents of the record unit corresponding to the key data are set in the data area, and the contents of the updatable data in the record unit are read into the stack area. and when the update data is given from the input device, the amount of change between the contents of the read stack area and the updatable data after being updated by the update data is stored in the rewrite stack area. When the cancellation instruction is given from the input device, the contents of the data area are changed to the contents of the data area before being updated by the update data, using the updated updateable data and the contents of the rewrite stack area. state and restore the above master
A data update control method characterized by storing data in a file. 2 The rewrite stack area is prepared as a pair with the key save area, and when the cancel instruction is given, the control device responds from the master file based on the contents of the key save area. 2. The data update control method according to claim 1, wherein the contents of each record are read out and set in the data area. 3. When the information in units of records is read from the master file and set in the data area, the information in units of blocks including the units of records is prohibited from being read redundantly, and the updated data is is given and the contents of the above master file are updated,
3. A data update control method according to claim 1 or 2, characterized in that said prohibited state for said block-by-block information is canceled.