JPH0682337B2 - File exclusion method - Google Patents

Description

The present invention relates to an improvement of a file exclusion method that excludes a file such as a database file for each storage unit, and in particular, a searched storage unit can be excluded by a program for an arbitrary period. Regarding the file exclusion method.

[Conventional technology]

A database file, which is an external storage medium for storing data as data records, is provided, and the database file can be divided into a plurality of parts called a storage unit, and the search and update of the database file can be performed simultaneously from multiple programs. In order to prevent a contradiction when updating from a plurality of programs at the same time, a system that performs exclusive control for each storage unit, which is the division unit, has been conventionally known.

FIG. 8 is a block diagram of a system that implements a conventional file exclusion system. 1 is a database file, 2 is a database exclusion means, 3 is a database utilization means, and 4a to 4n are application programs (AP; hereinafter simply referred to as programs). ).

The programs 4a to 4n are for searching and updating the data records in the database file 1 via the database using means 3, and the database using means 3 has the following two types of exclusive mode at the time of searching and updating. Execute exclusive control.

(1) First exclusive mode This is performed when the programs 4a to 4 update the storage unit,
Exclusive control that keeps the updated storage units locked until the program ends. That is, for example, when the program 4a requests the storage unit A to be updated, the database exclusion unit 2 is made to exclude the storage unit A, and at the end of the program 4a, the database exclusion unit 2 is made to exclude the storage unit A. Make it cancel.

(2) Second exclusive mode This is performed when the programs 4a to 4n search storage units,
Exclusive control that holds the searched storage unit until the program searches for another storage unit, and releases the exclusion of the original storage unit when searching for another storage unit. That is, for example, when the program 4a requests a search for the storage unit B, the database exclusion unit 2 is made to exclude the storage unit B, and when the program 4a requests a search for another storage unit C, the database exclusion unit 3 is made to release the exclusion of the original storage unit B.

[Problems to be solved by the invention]

However, in the conventional file exclusion method described above, the updated storage unit is excluded until the program ends, but the searched storage unit is released when another storage unit is searched, so the program is re-executed. In the case of searching the original storage unit, if the original storage unit is updated by another program, an exclusive error will occur.

In addition, the searched storage unit is released from the exclusion when another storage unit is searched, so if the program updates something using the contents of the data in the original storage unit, the original storage unit is If the data is updated by another program, there is a drawback that the content of the update using the content of the data of the storage unit cannot be guaranteed.

The above-mentioned drawbacks occur because the conventional file exclusion system has no means for realizing other exclusion except means for realizing the above-mentioned first and second exclusion modes. An object of the present invention is to eliminate the above-mentioned drawbacks of the related art by adding a means by which a searched storage unit can be excluded by a program for an arbitrary period.

[Means for solving problems]

In order to achieve the above object, the present invention comprises a file which is an external storage medium for storing data as a data record, divides the file into a plurality of parts, and uses database utilization means for searching and updating the file. Can be simultaneously performed from a plurality of programs via the program, and the database utilization means excludes the storage unit to be updated until the end of the program, and the program searches another storage unit for the searched storage unit. In a system in which exclusive processing for exclusive use is performed using a database exclusive means, a plurality of exclusive storage areas each capable of registering a plurality of storage units to be excluded, and a storage unit to be excluded in response to an instruction from the program Register in the specified exclusive storage area and exclude the registered storage unit. An exclusive registration means for notifying the database exclusive means, and an exclusive cancellation for all storage units registered in the specified exclusive recording area in response to an instruction from the program specifying the exclusive storage area The database exclusion unit, and the database exclusion unit cancels the registration of the exclusive storage area. The storage unit has a configuration in which exclusion is left for a storage unit for which there is a notification of exclusion from the registration means.

[Work]

When the program wants to secure exclusive access to a search unit A until a certain time after searching a certain storage unit A and searching another storage unit B, specify the exclusive storage area to be used and the storage unit A to be excluded. When the exclusive registration means is activated, the exclusive registration means registers the storage unit A in the specified exclusive storage area and also notifies the database exclusion means to exclude the storage unit A.

When the above program searches another storage unit B, the database utilization means notifies the database exclusion means to release the exclusion of the original storage unit A, but the storage unit A instructs the exclusion registration means to perform exclusion. I have received it,
The exclusion of the storage unit still remains, and at the time when the above program activates the exclusion release means by designating the exclusive storage area in which the storage unit A is registered, the exclusion release means causes the database exclusion means to exclude the storage unit A. Release is instructed and the exclusion is released.

〔Example〕

 Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an example of a system for implementing the file exclusion system of the present invention. This system includes a database file 1 which is an external storage medium for storing data as data records, and a plurality of programs 4a.
4n, database utilization means 3 for searching and updating the database file 1, database exclusion means 2 for exclusive use of storage units so as not to cause inconsistency when updating etc. from a plurality of programs at the same time, and storage units Multiple exclusive storage areas 8a to 8m that store pointers to
And an exclusive storage area management area 7 for storing the names, codes, and pointers to the exclusive storage areas 8a to 8m, and a pointer to the storage unit currently being processed by the program in response to an instruction from the program. An exclusive registration means 5 for registering the like in a designated exclusive storage area and operating the database exclusion means 2 so that the registered storage unit remains exclusive.
An exclusion release means 6 for operating the database exclusion means 2 to release the exclusion of the storage unit registered in the specified exclusive storage area in response to the instruction from the program, and for canceling the registration of the exclusive storage area. Have

FIG. 2 shows an example of the structure of the database file 1. As shown in FIG. 2, the database file 1 is composed of a plurality of data storage areas 10, 11, ..., One data storage area, for example, a plurality of data storage areas 10. Storage unit 101,102,10
Composed of three. One storage unit is the storage unit 101
The storage unit control record 101a and the plurality of data records 101b and 101c are included as illustrated in FIG.

FIG. 3 shows an example of the structure of the exclusive storage areas 8a to 8m. As shown in the exclusive storage area 8a, each exclusive storage area has the number of storage units registered in the exclusive storage area 8a and the exclusive storage area. Stores exclusive storage area control information 80 having area codes and the like, pointers 811 and 821 to storage units (which are also exclusion units), and exclusion modes (first exclusion mode or second exclusion mode) of the storage units 811 and 821. It consists of fields. The field for storing the exclusive mode can be omitted.

FIG. 4 shows an example of the structure of the exclusive storage area management area 7. The exclusive storage area management area control information 70 has the number of exclusive storage areas in the exclusive storage area management area 7, and the exclusive storage areas 8a to 8m.
Fields 710, 720, codes 711, 721, and pointers 712, 722 to exclusive storage areas.

In FIG. 1, when a program, for example, the program 4a, searches the storage unit 101 of the database file 1, the exclusion of the storage unit 101 may be released by searching another storage unit as in the conventional case. In this case, as in the conventional program 4a, in the second exclusive mode, the instruction necessary for searching the storage unit 101 is given to the database utilization means 3 and the exclusive registration means 5 is not used. At this time,
The database utilization means 3 instructs the database exclusion means 2 to perform exclusion of the storage unit 101, and when the program 4a instructs the retrieval of another storage unit, the database utilization means 3 excludes the storage unit 101. The exclusion of the storage unit 101 is released by instructing the release of the storage unit 101.

On the other hand, in the case where the program 4a searches the storage unit 101 and wants to secure the exclusion until a certain point later,
The exclusion registration means 5 is used to ensure exclusion. Hereinafter, this point will be described.

The program 4a defines an exclusive storage area to be used in advance when it is desired to perform exclusion by the exclusion registration means 5. Less than,
For convenience of explanation, it is assumed that the program 4a uses the exclusive storage areas 8a and 8b.

When the program 4a searches the storage unit 101 and wants to ensure the exclusion until a certain time point after the search of another storage unit, as shown in FIG. Therefore, the instruction necessary for searching the storage unit 101 is given to the database utilization means 3 and (S
1) Specify the exclusive storage area 8a and the storage unit 101 (specifically, specify the name) and activate the exclusive registration means 5 (S
2).

In response to the processing of step S1 of the program 4a, the database use means 3 instructs the database exclusion means 2 to exclude the storage unit 101, and the storage unit 101 obtained by the search is transferred to the program 4a through the database use means 3. Be notified.

On the other hand, in response to the processing of step S2 of the program 4a, the exclusive registration means 5 acquires a pointer from the designated name to the exclusive storage area 8a from the exclusive storage area management area 7 as shown in FIG. 6, for example. (S11), the designated storage unit 101 is searched from the exclusive storage area 8a according to the pointer (S12). In the above case, the code of the exclusive storage area is also obtained from the instructed name, and a check is made to see if it matches the code in the exclusive storage area control information 80 of the exclusive storage area 8a specified by the pointer. Be done. And
When the information about the storage unit 101 is already registered in the exclusive storage area 8a, the operation ends without doing anything, but when it is determined that the information is not registered in step S13, it is shown in the exclusive storage area 8a in FIG. Register the information about the storage unit 101 (S1
4), Notify the database exclusion unit 2 to exclude the storage unit 101. In response to this, the database exclusion unit 2 performs exclusion of the storage unit 101, but since this storage unit 101 has already been excluded by the notification from the database utilization unit 3, it is remembered that multiple exclusion notifications have been made. However, as will be described later, when the database utilization means 3 gives an instruction to release the exclusion of the storage unit 101, the exclusion remains.

Then, if the program 4a instructs the database utilization means 3 to search the storage unit 102 in the second exclusive mode as shown in step S3 of FIG. 5 (the exclusive registration means 5 is not used for this storage unit 102). The database using means 3 notifies the database using means 3 to release the exclusion of the original storage unit 101, and then notifies the database using means 3 of the exclusion of the storage unit 102. At this time, as described above, since the storage unit 101 is instructed to be mutually exclusive by the exclusion registration means 5, the storage unit 101 is not released from exclusion, and exclusion is continued thereafter.

Next, as shown in step S4 of FIG. 5, the program 4a instructs the database utilization means 3 to search the storage unit 103 in the second exclusive mode, and this storage unit 103 is searched after searching another storage unit. Since it is necessary to secure the exclusion until a time different from the storage unit 101, if the exclusive registration area 5 is activated by instructing another exclusive storage area 8b and the storage unit 103, the program 4a In response to the processing of step S4, the database use means 3 notifies the database exclusion means 2 of the release of the exclusion of the storage unit 102, and the database exclusion means 2 receives the exclusion instruction from the exclusion registration means 5 for the storage unit 102. Remove the exclusion from the absence.
After that, the database utilization means 3 notifies the database utilization means 3 of exclusion of the storage unit 103, and in response to this, the database utilization means 3 performs exclusion of the storage unit 103. On the other hand, in response to the processing of step S5 of the program 4a, the exclusive registration means 5 performs the same processing as the processing shown in FIG. 6 to store the storage unit 103 in the exclusive storage area 8b.
The information on the storage unit 103 is registered and the database exclusion unit 2 is notified to exclude the storage unit 103.

Now, the program 4a executes step S6 in FIG. 5 at the time when the exclusion of the storage unit registered in the exclusive storage area 8a is no longer required. That is, the exclusion release means 6 is activated by designating the name of the exclusive storage area 8a.

In response to this, the exclusion release means 6 obtains, for example, a pointer to the specified exclusive storage area 8a from the exclusive storage area management area 7 as shown in FIG. 7 (S21), and in the exclusive storage area 8a according to it. Accordingly, one pointer of the registered storage unit (exclusive unit) is acquired (S22), the pointer of the extracted storage unit is designated, and the database exclusion means 2 is notified of the cancellation of the exclusion of the storage unit (S22). S23). The database exclusion means 2 accordingly releases the exclusion of the storage unit. Therefore, when the notified storage unit is the storage unit 101, the exclusion of the storage unit is released at that time. When the exclusion release unit 6 notifies the database exclusion unit 2 of the release of the exclusion of one storage unit, the information about the storage unit is deleted from the exclusive storage area 8a (S2
Four). Then, it is determined whether or not the storage unit registered in the designated exclusive storage area 8a remains, that is, whether or not all the registered contents have been deleted (S25), and if it remains, the above-mentioned operation is repeated. By doing so, the exclusive storage area 8a
Delete the registration for releasing the exclusion of all storage units registered in.

As can be seen from the above-described operation, in the present embodiment, the exclusion release control by the exclusion release means 6 is performed in units of exclusive storage areas. Therefore, the program 4a instructs the exclusion unit 6 to register the storage units for which exclusion is to be released in the same exclusion storage area at the same time, so that a single release instruction to the exclusion release means 6 allows exclusion of a plurality of storage units. Can be canceled. As for the storage unit that is not desired to be released at that time, the storage unit 103 is stored in an exclusive storage area 8b different from the exclusive storage area 8a in which the storage unit 101 is registered.
, Another exclusive storage area may be used.

〔The invention's effect〕

As described above, the present invention enables exclusion of a desired storage unit via an exclusion registration unit that can be activated by a program, in addition to the exclusion notification of the storage unit from the database utilization unit to the database exclusion unit. The exclusive storage unit registered in the exclusive storage area by the registration means can be released by specifying the exclusive storage area in the exclusion release means. This has the effect of enabling exclusion, preventing the exclusion error that has occurred in the past, and preventing the contents of the update from being guaranteed. Further, it is provided with a plurality of exclusive storage areas each capable of registering a plurality of storage units to be excluded, and all storage units registered in a certain exclusive storage area can be collectively released by simply specifying the exclusive storage area. By doing so, it is possible to set an arbitrary exclusion section for each group consisting of several storage units by selectively using multiple exclusive storage areas in one program, and to compare the method of issuing an exclusion release instruction for each storage unit. There is also an effect that the load of the program at the time of cancellation can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of a system for implementing the file exclusion system of the present invention, FIG. 2 is a diagram showing an example structure of a database file, FIG. 3 is a diagram showing an example structure of an exclusive storage area, and FIG. FIG. 5 is a diagram showing an example of the structure of the exclusive storage area management area, FIG. 5 is a flow chart of a processing example of the program 4a, FIG. 6 is a flow chart of a processing example of the exclusive registration means, and FIG. 7 is a processing example of the exclusion releasing means. The flow chart and FIG. 8 are explanatory views of the conventional method. In the figure, 1 ... database file, 2 ... database exclusion means, 3 ... database usage means, 4a ...
4n …… A program that uses database file 1,
5 ... Exclusive registration means, 6 ... Exclusive release means, 7 ... Exclusive storage area management area, 8a-8m ... Exclusive storage area.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-59-2159 (JP, A) JP-B-59-47341 (JP, B2) “ACOS software ACOS-4 / MVPXEADBS Operation Manual DFC74-6” 6 Edition (1985-6) NEC PP. 64-69

Claims (1)

[Claims] 1. A file which is an external storage medium for storing data as a data record is provided, the file is divided into a plurality of parts, and retrieval and update of the file are performed from a plurality of programs via database utilization means. The database use means can perform an exclusive process in which the storage unit to be updated is exclusive until the end of the program and the searched storage unit is exclusive until another program is searched for by the program. In a system using database exclusion means, a plurality of exclusive storage areas each capable of registering a plurality of storage units to be excluded, and the exclusive storage in which a storage unit to be excluded is designated in response to an instruction from the program When registering in the area, the database exclusion procedure is set so as to exclude the registered storage unit. And an exclusive registration means for notifying the exclusive exclusion area of the database in response to an instruction from the program that specifies the exclusive storage area, and cancels the exclusion for all storage units registered in the specified exclusive storage area. Means for canceling the registration of the exclusive storage area, and the database exclusion means, even if there is a notification to release the exclusion from the database utilization means, the exclusion registration means excludes the exclusion. File exclusion method characterized by leaving exclusion for storage units that have notifications to be made.