JPH0245842A - Data file control system - Google Patents

Abstract

PURPOSE:To eliminate the allocation of file to be conventionally executed with an operator and the change of a control program, etc., by preparing the file with a data file generating part according to information which are recorded to a data file control information table. CONSTITUTION:When a data file is prepared, data file designating information 50 are inputted. However, a data file identification number, the record size of one record and the record number of the data file are set according to the form of the data file to be prepared and an exclusive section is not designated. The above mentioned inputted information 50 are stored to a data file control information table 22 by a storage part 21. A data file preparing part 23 refers the above mentioned information 50 and prepares a memory file 31 on a main storage 30. After that, the starting address of the memory file 31 on the main storage 30 is set to a starting address 108 of the data file information table 22.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data file management method for a control system that uses a disk file on a disk device and a memory file on a main memory as data files.

[Prior Art] Control systems that use disk files and memory files as data files are used differently depending on the purpose based on their characteristics.

Disk files are characterized by the large amount of data they can store.
Although the stored data is saved semi-permanently, the data access speed is slow. Furthermore, a memory file is characterized by the fact that it can store only a small amount of data and can only store data temporarily, but the data access speed is fast.

Part 3 explains how to use data files in control systems.
This will be explained according to the diagram.

First, when designing a control system, an operator defines an area to be used as a data file and enters the area in the data file management table 51. At this time, it is decided whether to use the data file as a disk file or a memory file depending on the purpose of the data file, and this is also entered in the data file management table 51. This is called data file management information.6 Next, organize the information entered in this data file management table 51, and if it is a disk file, write it in the disk file management table 53, and if it is a memory file, write it in the memory file management table 52. Enter file management information. In the case of a disk file, a disk file 41 is generated on the disk device 40 based on the information in the disk file management table 53. Furthermore, in the case of a memory file, the memory file 31 is allocated on the main storage device 3o based on the information in the memory file management table 52. The data file allocated and created by the operator in this way is used by the control system.

When using this data file in the control system,
Data is referenced and updated by a disk file reference means 56 and a disk file update means 57 for the disk file 41, and by a memory file reference means 54 and a memory file update means 55 for the memory file 31, respectively.

Also, referring to Figure 4, when using disk files, the number of disk files that can be used by the control system is often limited, so if disk files exceeding this limit are required for the entire control system. teeth,
In many cases, the disk file 41 is divided into record units, such as data file A and data file B, and then allocated to other data files for use. At this time, the operator changes the control program 60 to create control programs A and B, and the control system uses the control program A.
, B, the data is referenced and updated while being aware of where the data files A and B are allocated.

[Problem to be Solved by the Invention 1] In the conventional control system described above, when allocating disk files and memory files and when using one disk file as two or more data files, file allocation is done manually by humans. Because this is done using ``Double Allocation'', mistakes are likely to occur in ``Double Allocation'' etc.

In addition, when changing the functions or improving the performance of a control system, in addition to expanding the data file, it is also possible to change part of the data file from a disk file to a memory file.
Conversely, it is often necessary to change from a memory file to a disk file. At this time, it is necessary to reallocate both the disk file and the memory file, but this takes a lot of effort and is prone to mistakes such as double allocation. Also, since the reference and update methods for disk files and memory files are different, it is necessary to change the program itself in the control system, but if you make a mistake when making this change, the entire control system may not work properly. There is a drawback that it comes.

[Means for Solving the Problems] The data file management information of the present invention is created by including, when creating a file, the identification number of the data file and the disk/memory classification indicating whether the file to be created is a disk file or a memory file. Exclusive information indicating whether records of a disk file can be created as one file together with records of other disk files, specification information that specifies, and a data file that includes the beginning information and identification name of the file that will be generated after the data file is created. a data file management information table in which management information is recorded; a data file management information storage means for recording the specified information in the data file management information table in association with the identification number when creating a file; and data file management information Creates a disk file or memory file by referring to the specified information recorded in the table, and attempts to create it when the number of disk files exceeds the number of disk files that can be used in the control system. Refers to the exclusive information of the disk file, and if the exclusive specification is not specified, extracts an already created file that is not specified as exclusive, creates a disk file containing the record of the file and the record of the file to be created, and creates a disk file. After creating a file and a memory file, a data file generation unit records the start information and identification name of the file in a management information table, and when a file reference request specifying a file identification number is received from the control program, the a data file reference means that refers to data file management information in the table, retrieves the corresponding data file from the disk device or main memory, and transfers it to the control program; and a file containing file identification numbers and updated record information from the control program. When receiving an update request, data file update means refers to data file management information in the table based on the identification number, extracts the corresponding data file, and updates records in the file according to the update record information. have.

[Operation] The data file generation unit creates a file according to the information recorded in the data file management information table,
Further, even when files are used for reference or update, the information can be referred to for execution, thereby eliminating the need for an operator to allocate files, change control programs, etc., which were conventionally done.

[Example] Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a control system to which the data file management method of the present invention is applied, and FIG. 2 is a diagram showing an embodiment of data file management information.

The control system of this embodiment is composed of a data file specification information input device 10, a CPU 20, a main storage device 3°, and a disk device 40, and includes a memory file in the main storage device 30 and a disk file in the disk device 4°. The use of is managed by a control program 60.

The data file specification information input device 1o inputs a data file identification number specified when creating a data file, a disk/memory classification indicating whether the file to be created is a disk file or a memory file, and a disk/memory classification indicating whether the file is a disk file or a memory file. Data file specification information including exclusive classification, which is exclusive information that is specified and indicates whether records of the disk file can be created as one file together with records of other disk files, the record size of the code, and the number of records. 50 input sections.

The CPU 20 includes a data file designation information storage section 21, a data file management information table 22, a data file generation section 23, a data file reference section 24, and a data file update section 25. The data file designation information storage unit 21 stores the data file designation information 50 input from the data file designation information input device 10 into the data file management information table 22. In the data file management information table 22, as shown in FIG.
01, Lou code record size 102, number of data file records 103, disk memory division 104
, an exclusive classification 105, and a disk file identification name 106 and a start record 10 on the disk file, which are generated when the data file is created.
7 and a column in which the start address 108 on the main storage device 30 is recorded. The data file generation unit 23
A data file is created in the main storage device 30 or the disk device 40 by referring to the data file designation information 50 stored in the data file management information table 22.

At this time, if the disk memory section 104 is specified as a disk file and the exclusive section 105 is specified as exclusive, a disk file is created using the record size 102 and the number of records 103, a name is generated for the created disk file, and the data file is managed. In the disk file identification name 106 of the information table 22 and in the start record 107, “
1”. Additionally, disk memory partition 104
is a disk file specification and the exclusive classification 105 is not an exclusive specification, and if creating this disk file exceeds the number of disk files that can be used in this control system, the rule code of the data file to be created is Refers to record size 102, extracts all management information of data files of the same size and not specified as exclusive, calculates the total number of records 103, and creates a disk file with that number of records,
The name of the created disk file is generated and set in the disk file identification name 106 of the data file management information of the data file related to the record included in the disk. At the same time, the start record number assigned to each data file belonging to the created disk file is set in the start record 107. On the other hand, if the disk memory partition 104 is specified as a memory file, a memory file with a size equal to the record size 102 of the Lou code multiplied by the number of records 103 is created on the main storage device 30, and its start address is set as the start address 108. Set to . The data file reference unit 24 is a control program 6
The identification number of the data file is obtained from the data file reference request from 0, and the data file management information table 22
Obtain the data file management information to be referenced from the data file management information table 22, obtain the data file management information of the data file to be referenced from the data file management information table 22, and if the disk/memory classification 104 specifies a disk file, the disk file identification name 106. If the disk/memory partition 104 is designated as a memory file, the start address 108 specifies the disk file or memory file to be referenced, reads that file, and transfers it to the control program 60. The data file update unit 25 obtains the identification number of the data file, the record number to be updated, and the update data from the data file update request from the control program 60, and manages the data file of the data file to be updated from the data file management information table 22. If the information is obtained and the disk memory section 104 is specified as a disk file, the disk file identification name 1
06, the corresponding disk file is specified, and the number on the disk file is determined from the start record number 107 and the record number to be updated, and the update/update is performed. Also,
If the disk memory partition 104 is specified as a memory file, the start address 108, record size 102, and address on the main storage device 30 of the record to be updated are determined and updated.

Next, the operation of this embodiment will be explained.

First, the creation of a data file will be explained using the creation of the memory file 31 as an example.

First, when creating a data file, input the data file specification information 50. Here, the data file identification number, the record size of the roux code, and the number of records of the data file are input according to the format of the data file to be created. The disk/memory classification is set to "memory," and the exclusive classification is unspecified. The input data file designation information 50 is stored in the data file management information table 22 by the data file designation information storage section 21 . With reference to the data file designation information 50, the data file generation unit 23 creates the memory file 3.
1 on the main storage device 30, and then the main storage device 3
The start address of the memory file 31 on 0 is set as the start address 108 of the data file information table 22.

Next, the update operation will be explained using the disk file 41 created in the disk device 40 as an example.

When the control program 60 issues an update request specifying the identification number of the disk file 41, the record number of the update record, and update data, the data file update unit 25 reads the data file management information of the data file management information table 22 from the identification number. The record number of the record to be updated and the record number within the disk file 41 are obtained from the start record 107 of the disk file 41, and the desired update is performed.

Note that changing the data file from a file to a memory file can be done by changing the disk/memory classification 104 of the data file administrator n report and generating the data file again by the data file generation unit 23. Become.

[Effects of the Invention] As explained above, the present invention has the following advantages: when the data file generation unit creates a data file according to the data file management information recorded in the data file management information table, and when the created data file is used. By referring to and updating disk files and memory files using the data file reference section or update section, errors in data file allocation can be reduced when data files are managed by an operator, and data file utilization can be reduced. In this case, the control program no longer needs to be aware of the data file allocation, and furthermore, when the data file allocation is changed, or when one disk file is divided and shared with other disk files, those updates are not necessary. Since the information and division information are recorded in the data file management information table, there is an advantage that there is no need to change the control program.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a control system applying the data file management method of the present invention, FIG. 2 is a diagram showing data file management information recorded in the data file management information table 22, and FIG. 3 , FIG. 4 is a block diagram showing a conventional example. 10...Data file specification information input device, 20...
・CPU, 21...Data file specification information storage section, 22...
Data file management information table, 23... Data file generation section, 24... Data file reference section, 25... Data file update section, 3o... Main storage device, 31... Memory file,
40... Disk device, 41... Disk file, 50... Data file management information, 60... Control program, 101... Data file identification number, 102... Record size of Lou code, 103 ...Number of records in data file, 104...Disk/memory classification, 105...Exclusive classification, 106...Disk file identification name, 107...
Start record on disk file, 108 . . . start address of the memory file on main storage device 30.

Claims (1)

[Claims] 1. In a control system that creates a disk file on a disk device and a memory file on a main memory as data files, and references and updates the created data files under the control of a control program. , When creating a file, the identification number of the data file, the disk/memory classification indicating whether the file to be created is a disk file or a memory file, and the record of the disk file to be created are created as one file along with the records of other disk files. a data file management information table in which are recorded specification information that specifies exclusive information indicating whether or not it is possible, and data file management information of the head information and identification name of the file generated after the data file is created; At this time, data file management information storage means records the specified information in a data file management information table corresponding to the identification number; When creating a file, if the number of disk files that can be used in the control system is exceeded when creating a disk file, refer to the exclusive information of the disk file to be created and if it is not specified as exclusive, the file has already been created. Extract the file that is not specified as exclusive, create a disk file containing the record of the file and the record of the file to be created, and after creating the disk file and memory file, write the start information and identification name of the file. A data file generation unit that records in a management information table, and when receiving a file reference request specifying a file identification number from a control program, refers to the data file management information in the table using the identification number and selects the corresponding data file. a data file reference means that retrieves data from a disk device or main memory and transfers it to a control program; and when a file update request including a file identification number and update record information is received from the control program, the data in the table is retrieved using the identification number. A data file management method comprising a data file update means for extracting a corresponding data file by referring to file management information and updating records in the file according to update record information.