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Data access method and data access device

A data access and data technology, applied in measurement devices, database indexes, database updates, etc., can solve the problems of inability to access data, a large amount of data, and no mention of managing data relationships, and achieve high-speed, effective, and accessible effects.

Inactive Publication Date: 2013-01-02
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in Patent Document 1, there is no mention of the relationship between the data access program that accesses the actual data and the above-mentioned address and pointer management data
Generally, when the data specification is changed, the data access program must be modified accordingly. Even if only the change of the address or offset indicating the data storage location is managed, if the data access program does not correspond, effective operation cannot be performed. data access
[0004] In particular, the map data used by navigation devices generally has a variable capacity and length, a large amount of data, and frequent updates. Moreover, the data format itself often changes.

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment approach 1

[0048] figure 1 It is a block diagram showing the configuration of the data access device according to Embodiment 1 of the present invention. exist figure 1 Among them, the data access device 1 in Embodiment 1 is a device that automatically generates data management data and a data access program.

[0049] The so-called data management data is data set with the following content: namely, the address indicating the storage location of data in the data aggregate (database or file system) (data group) used by the system for realizing a certain purpose; or An offset (storage position in a data group) indicating the head of data or the distance from the head of data to a specific structural element (data item). The data access program is a program that refers to the data management data and accesses the actual data of the data aggregate.

[0050] In addition, the structure of the data access device 1 includes a data definition information input unit 2, a data definition informat...

Embodiment approach 2

[0103] Figure 19 It is a block diagram showing the configuration of a navigation device according to Embodiment 2 of the present invention. exist Figure 9 in, right with figure 1 as well as figure 2 The same structural parts are given the same reference numerals, and their descriptions are omitted. The navigation device 14 of the second embodiment is a navigation device using the data access device 1 of the first embodiment, and incorporates the data management data 10b and the data access program 10c generated by the data access device 1 .

[0104] Program elements for realizing various functions in the navigation device 14 are registered in the SW library 10a. For example, objects involved in the route search function have a hierarchical structure composed of program elements that realize various functions in the route search.

[0105] The map database (map DB) 10d is a data aggregate composed of map data. In addition, the navigation device 14 consists of figure 2...

Embodiment approach 3

[0133] Figure 26 It is a block diagram showing the configuration of a navigation device according to Embodiment 3 of the present invention. Figure 26 in, right with figure 1 , figure 2 ,as well as Figure 19 The same structural parts are denoted by the same reference numerals, and description thereof will be omitted. In the navigation device 14a of the third embodiment, the configuration of the navigation device 14 of the second embodiment includes the configuration of the data access device 1 of the first embodiment, the data definition information input unit 2, and the data definition information analysis unit. 3. Data management data generation unit 4 , data access program generation unit 5 , data management data output unit 6 , and data access program output unit 7 .

[0134] The data management data output by the data management data output unit 6 is stored as data management data 10b in such as figure 2 Similarly, in the external storage device 10 and the like s...

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Abstract

Disclosed is a data management device comprising data management data which stipulates the location of real data based on data definition information representing a data structure of a data group, and a data access program which describes access functionality to the real data specified by the data structure based on the data definition information. The data management device references the data management data and specifies the location of the real data, runs the data access program, and accesses the real data in the data group.

Description

technical field [0001] The invention relates to a data access method and a data access device for accessing a database to obtain desired data. Background technique [0002] For example, Patent Document 1 discloses a service function providing device that uses a table to manage addresses of service function units executing service functions and indicators of service function execution units. When accessing data or a specific service function, the address corresponding to the indicator is obtained by referring to the table, and the service function execution unit is activated based on the address to execute the service function. This device can directly call the function associated with the parent program from the common library by referring to the above-mentioned table using the entry name. [0003] However, Patent Document 1 does not mention the relationship between a data access program that accesses actual data and the above-mentioned management data of addresses and poin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F12/00G01C21/00G06F9/44
CPCG06F17/30345G06F17/30312G01C21/26G06F17/30241G06F16/22G06F16/23G06F16/29
Inventor 坂入威郎玉田隆史后藤幸夫下谷光生御厨诚
Owner MITSUBISHI ELECTRIC CORP