JPH05274201A - File controller - Google Patents

Abstract

PURPOSE:To improve the use efficiency of a system by reducing the load of softwares at the time of file access and preventing the access time of files from being affected by the load state of softwares. CONSTITUTION:A retrieval key data comparing part 2 compares the data of the file name of a retrieving object with retrieval key data according to comparative conditions and retrieves the index field of the file. A data storage address holding part 3 informed the comparative condition establishment from the comparing part 2 holds a data storage address in the index field establishing that comparative condition and instructs the start of positioning to a positioning control part 4 together with the data storage address. The positioning control part 4 positions the data at that data storage address.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a file control device, and more particularly to a file control device which speeds up search access to a relational database or the like.

[0002]

2. Description of the Related Art File management in a randomly accessible file device such as a magnetic disk and a floppy disk is performed by using an index (INDEX) file, an index (INDEX) cylinder, etc., such as a file name, a file storage address, and a file size. Information is stored and done.

In the file access in the system using the conventional file control device, first, the software asks the file control device to search the file control device for a file name or the like which is a key for the file search on the index (INDEX) file. When the instruction is given and the file controller detects the target file name, the software further instructs the file controller to read the record including the file information. The software, which has obtained the file information about the target file, instructs the file controller to position the storage address of the file in the file information, and the file can be accessed when the positioning is completed.

[0004]

However, in this conventional file control device, processing by software is included between the instruction of the file search key and the instruction of positioning to the actual storage address of the file. There was a problem that the access time of the file depends on the load condition.

The present invention has been made in view of the above-mentioned conventional circumstances, and therefore an object of the present invention is to provide a novel file control apparatus capable of solving the above problems inherent in the conventional art. Especially.

[0006]

In order to achieve the above object, a file control apparatus according to the present invention is provided with a means for storing format information of an index (INDEX) field and an external source based on this format information. Means for comparing the search key data with the key of each index field, means for holding the data storage address in the index field where the comparison condition is satisfied,
And a means for locating the data storage address.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail with reference to the accompanying drawings with reference to the accompanying drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention.

Referring to FIG. 1, the format information storage unit 1 stores an index (INDEX) as shown in FIG.
The format information of the field is stored, and whether or not the data sent at that time is the data of the file name to be searched is stored in the search key data comparison unit 2, and whether the data of the file storage start address is stored or not is stored in the data storage address. The holding unit 3 is notified respectively. The search key data comparison unit 2
Data notified of from the format information storage unit 1 that the data has a file name to be searched is compared with search key data given from the outside, and when the comparison condition is satisfied, the data storage address holding unit 3 Notify that the comparison condition is satisfied. When the data storage address holding unit 3 receives the comparison condition establishment notification from the search key data comparison unit 2, the data storage address holding unit 3 converts the data for which the data storage start address is notified from the format information storage unit 1 to the data storage address. Hold as. The positioning control unit 4 controls positioning to the data storage address held by the data storage address holding unit 3.

Next, the operation of this embodiment will be described. here,
The INDE as shown in FIG.
It is assumed that there is an INDEX file in which a plurality of X fields are continuous. Further, it is assumed that the format information storage unit 1 is previously provided with the format information of the INDEX field in the INDEX file. First, when a search key and a comparison condition are given from the outside, the format information storage unit 1 stores each I in the INDEX file.
The search key data comparison unit 2 is notified of the period during which the data of the file name to be searched for in the NDEX field is being sent. Search key data comparison unit 2 that received this notification
Compares the data at this time with the search key data according to the comparison condition. If this comparison condition is not satisfied, the next INDEX field is similarly compared. When the comparison condition is satisfied, the search key data comparison unit 2 notifies the data storage address holding unit 3 that the comparison condition is satisfied. The data storage address holding unit 3 that has received the notification that the comparison condition is satisfied,
When receiving a signal from the format information storage unit 1 indicating that the file storage start address in the INDEX field is sent, the data sent from the device is held as the data storage address. When the data storage address holding unit 3 finishes fetching the data storage address, it instructs the positioning control unit 4 to start positioning together with the data storage address. The positioning control unit 4, which has received the positioning start instruction, positions the data storage address.

[0011]

As described above, according to the present invention, the search of the INDEX field of a file to the positioning of the storage address of the file is performed only by the file controller without software intervention. The effect is that the load on the software at the time is reduced, the file access time is not affected by the load state of the software, and the system usage efficiency is improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing an example of format information of an INDEX field.

[Explanation of symbols]

 1 ... Format information storage unit 2 ... Search data comparison unit 3 ... Data storage address holding unit 4 ... Positioning control unit

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[Procedure amendment]

[Submission date] March 19, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

Claims (1)

[Claims] 1. A file control device for processing a record in which an index field of the same format including a key for searching file information and a data storage address is consecutive, and means for storing the format information of the index field. , Means for comparing the search key data given from the outside based on this format information with the key of each index field, means for holding the data storage address in the index field where the comparison condition is satisfied, and the data storage address A file control device comprising means for positioning.