JPS63245753A - Dispersion type data base accessing mechanism - Google Patents

Abstract

PURPOSE:To execute programming without being conscious of a communication means between a master information processor and a remote information processor by setting up a device for executing network communication procedure independently of a program formed on the information processor requiring data so that the device can be utilized by plural programs in common. CONSTITUTION:When a program 5 stored in an information processor 2 generates a data access instruction for data in a network system, an accessed destination deciding/switching module 60 decides an accessed destination by a destination address defined in the instruction. A communication procedure module appropriate for one of information processors 11-13 to be communicated is selected from communication procedure module 61-63 and an access instruction is transferred to the selected module. The communication procedure module requests data in data storage devices 41-43 by the communication procedure regulated by the information processors 11-13 to be communicated through network devices 31-33, and at the time of receiving data, transfers the data to the program 5 initially generating the data access instruction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a database access mechanism, and more particularly to a database access mechanism distributed over a network in data processing software technology of an information processing system.

[Conventional technology]

Conventionally, in this type of data access method for databases distributed on a network, when accessing a data storage device on the other side between multiple information processing devices connected by a network device, communication is required between each information processing device. Data access was performed by storing programs, setting unique communication formats, performing inter-program communication, and realizing data transfer.

[Problem that the invention seeks to solve]

In the conventional data access method for databases distributed on a network as described above, communication is performed in a uniquely set communication format that can be operated on each information processing device, depending on the model of the information processing device connected by the network device. Since it is necessary to manufacture a communication program, there is a drawback that a large amount of development man-hours are required to construct a network system.

SUMMARY OF THE INVENTION An object of the present invention is to provide a distributed database access mechanism that eliminates the above-mentioned drawbacks, facilitates the construction of a network system, and significantly reduces the number of man-hours required for program production.

[Means for solving problems]

A distributed database access mechanism of the present invention includes an information processing device having a data storage device as a plurality of external memories constituting a network system, a network device connecting these information processing devices, and a network device that connects the data storage device to another. It is characterized in that it is configured to include an access destination determination/switching module that is accessed from a program stored on the information processing device, and a data access device that includes a communication procedure module prepared for each access destination.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of each device for realizing distributed database access according to an embodiment of the present invention, in which 11 to 13.2 are each information processing device on the network system, and 3 is an information processing device. 41 to 43 are data storage devices; 5 is a program that accesses the data storage devices 41 to 43 on the information processing devices 11 to 13 operating on each information processing device 2 on the network system; 6 is a data access device that executes the distributed database access processing of the program 5.

FIG. 2 is a block diagram showing a detailed module configuration of the data access device 6 shown in FIG.
an access destination determination/switching module that receives a data access command requested by the user and determines which data storage device on which information processing device on the network the command is directed to, based on the destination address in the command; 6
Communication procedure modules 1 to 63 execute communication procedures necessary for accessing the destination information processing device, and are set for each destination information processing device of a different model.

Here, when the progera 5 stored in the information processing device 2 issues an instruction to access data on the network system, the access destination determination/switching module 60 determines the access destination based on the destination address defined in the instruction. , selects a communication procedure module suitable for the information processing device 11 to 13 of the communication partner from among the communication procedure modules 61 to 63, and passes the access command. The communication procedure module communicates with the destination information processing device 11 via the network devices 31 to 33.
13, the data storage device 41
43, and upon receiving the data, the data is delivered to the program 5 that originally issued the data access command.

〔Effect of the invention〕

As explained above, the present invention sets up a device that executes network communication procedures individually defined for each model of information processing device on an information processing device that requires data, independently of a program, and By making it possible for programs to access data on the network, programs do not need to be aware of the communication procedure with the other party's information processing device, and the network system It is easy to construct and has the effect of significantly reducing the number of man-hours required for program production.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of each device for realizing distributed database access according to an embodiment of the present invention;
FIG. 2 is a block diagram showing a detailed module configuration of the data access device 6 of FIG. 1. 2... Information processing device requesting access, 5... Program, 6... Data access device, 11-13.
. . . destination information processing device to be accessed, 60 . . . access destination judgment/switching module, 61 to 63 . . . communication procedure module.

Claims (1)

[Claims] An information processing device that has a data storage device as a plurality of external memories that constitute a network system, a network device that connects these information processing devices, and a program that stores the data storage device on another information processing device. A distributed database access mechanism characterized in that it is configured to include a data access device consisting of an access destination determination/switching module and a communication procedure module prepared for each access destination.