JPH0340042A - Multiple accessing device - Google Patents

Abstract

PURPOSE:To efficiently prevent the data loss caused by a multiple access by generating two copying bodies of data at the time of reference, and comparing the data to be updated with the copying body which is not edited. CONSTITUTION:The subject device is provided with a generating means 2 for generating editing copying body data and non-editing copying body data, respectively, an editing means 6 for editing and storing the editing copy body data and an editing copying body storage part 4, a comparing means 7 for comparing the contents of the non- editing copy body data with the contents of the data on a data storage part 3 being a copy origin of this non-editing copy body data, an updating means 8 for substituting the editing copying body data for the contents of the data of the data storage part 3 when the result of its comparison shows the coincidence, and a warning means 9 for generating a warning when the result of comparison shows the discordance. In this state, at the time of reference, two copying bodies of the data are generated, the edition of the data is executed only to one copying body, and at the time of updating, the data and the copying body which is not edited are compared, and only when updating of the data is not executed before its time point by other user, updating is permitted. In such a manner, the data loss at the time of multiple access can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is applied to data access means of an electronic computer. In particular, the present invention relates to means for preventing data loss during so-called multiple accesses in which a large number of users simultaneously input and output data.

〔overview〕

In a multiple access means in which a large number of users input/output data at the same time, the present invention generates two copies of data at the time of reference, and compares the data to be updated with the unedited copy. , it is possible to efficiently prevent data loss due to multiple accesses.

[Conventional technology]

In the conventional example, each user declares whether the data will be accessed for reference or update at the initial stage of data access, multiple accesses are allowed only for users who perform reference access, and users declare update access. This prevents data loss due to multiple accesses by locking the data and preventing other users from updating it.

[Problem that the invention seeks to solve]

Such conventional examples have the following drawbacks.

(1) Other users cannot access the data until the update declaration is canceled. (2) It is necessary to decide whether to refer or update at the initial stage of data access.

[Means for solving problems]

The present invention provides a data storage unit for storing data, and a plurality of input means for inputting a first command to refer to the data stored in the data storage unit and a second command to update the data. In the access device, generating means for respectively generating editing copy data and non-editing copy data that are copies of the data referenced in the first command;
an editing storage means that edits and stores the editing copy data generated by the generation means; and a data storage that stores the contents of the unedited copy data and the source of the unedited copy data according to a second command. a comparison means for comparing the contents of the data on the copying section; and when the comparison result of the comparison means shows a match, the contents of the data stored in the data storage section are copied into an editing copy stored in the editing storage means; The present invention is characterized in that it comprises an updating means for replacing the data with body data, and a warning means for issuing a warning when the comparison result of the comparing means shows a discrepancy.

[Effect]

Two copies, an editing copy and an unedited copy, are generated from the data according to a reference instruction issued by the user, and the contents of the editing copy are further edited.

Check the differences between the data and the non-edited copy according to the issued update instructions, and replace the data content with the content of the edited copy. It also notifies the user that the data has been updated by another user.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. This embodiment is an example in which the present invention is applied to an editor.

FIG. 1 is a block diagram showing the configuration of this embodiment. As shown in FIG. 1, this embodiment includes an input means 1 through which a user issues an instruction to refer to and update data, and a data storage section shown in FIG. Input the data of 3 through connection 11,
A generation means 2 that generates a copy with exactly the same content as the data and stores it in the editing copy storage section 4 through the connection 12 and the unedited copy storage section 5 through the connection 13, and the editing copy input through the connection 4. an editing means 6 for editing the contents of the copy storage section 4, such as adding, deleting, replacing, etc., and storing the edited copy storage section 4 through a connection 15; and an input means 1;
connection 1 according to the update instruction input through connection 16 from
The contents of the data storage unit 3 input through 7 and the connection 18
If there is no difference between the two contents, an instruction is issued to the update means 8 through the connection 19, and if there is a difference between the two data, an instruction is issued to the update means 8 through the connection 20. A comparison means 7 issues an instruction to the warning means 9, and the contents of the editing copy storage section 4 input through a connection 21 are stored in the data storage section 3 through a connection 22 in accordance with an instruction inputted from the comparison means 7 through a connection 19. and a warning means 9 for notifying the user that the data in the data storage section 3 has been updated by another user by, for example, sounding a buzzer or displaying a warning message.

That is, this embodiment includes a data storage unit 3 that stores data, and a plurality of input means that input a first command to refer to the data stored in the data storage unit 3 and a second command to update the data. 1, and further includes a generating means 2 for generating editing copy data and non-editing copy data, which are copies of the data referred to in the first command, respectively; An editing means 6 and an editing copy storage section 4 are editing storage means for editing and storing the editing copy data generated by the generation means 2.
and a comparing means 7 for comparing the content of the unedited copy data with the content of the data on the data storage section from which the unedited copy data is copied according to the second command;
an updating means 8 for replacing the content of the data stored in the data storage section 3 with the editing copy data stored in the editing storage means when the comparison result shows a match; and a comparison means 7
and a warning means 9 which issues a warning when the comparison results of the two show a discrepancy.

FIG. 2 shows the processing procedure when a user accesses data using an editor. Next, the operation of this embodiment will be explained based on FIG.

When a reference instruction is issued from the human power means 1, the generation means 2 generates two copies, an editing copy and an unedited copy, with exactly the same content as the data (steps 35 and S2).
. Next, the editing means 6 edits the copy for editing (step S3). When the editing is completed, if no update instruction is issued from the input means 1, the editor processing ends (NO in step S4). When the update instruction is issued (YES in step S4), the comparison means 7 checks the difference between the data and the unedited copy, and if there is no difference (NO in step S35).
The updating means 8 replaces the contents of the data with the contents of the editing copy (step S6).

If there is a difference (YES in step S5), the warning means 9 issues a warning (step S7).

FIG. 3 shows the contents of the data storage section 3, and the data includes, for example, strings of characters and numbers.

〔Effect of the invention〕

As explained above, the present invention generates two copies of data at the time of reference, edits the data only in one copy, and compares the data with the unedited copy at the time of update. Since the data is only allowed to be updated if it has not been updated by another user up to that point, the time the data is locked can be reduced to just the physical writing time, and data access This has the effect of allowing multiple accesses without having to decide whether to reference or update at the initial stage.

[Brief explanation of drawings]

FIG. 1 is a block configuration diagram showing the configuration of an embodiment of the present invention. FIG. 2 is a flowchart showing the operation of the embodiment of the present invention. FIG. 3 is a configuration diagram of the data storage section shown in FIG. 1. DESCRIPTION OF SYMBOLS 1... Human power means, 2... Generating means, 3... Data storage section, 4... Editing copy storage section, 5... Unedited copy storage section, 6... Editing means , 7... comparison means,
8...Updating means, 9...Warning means.

Claims (1)

[Claims] 1. A data storage unit that stores data; and a plurality of input means that input a first command to refer to the data stored in the data storage unit and a second command to update the data. a multiple access device comprising: generating means for respectively generating editing copy data and non-editing copy data that are copies of the data referred to in the first command; and editing copies generated by the generating means. an editing storage means for editing and storing the original data, and comparing the content of the unedited copy data with the content of the data on the data storage unit from which the unedited copy data is copied according to the second command. a comparing means; and an updating means for replacing the contents of the data stored in the data storage section with the editing copy data stored in the editing storage means when the comparison result of the comparing means indicates a match; 1. A multiple access device comprising: warning means for generating a warning when the comparison result of the comparison means shows a mismatch.