JPH02238519A - Data conversion system - Google Patents

Abstract

PURPOSE:To improve the transfer efficiency of the table form data to a terminal equipment from a host computer by storing temporarily the data and reusing them. CONSTITUTION:A table data block length deciding part 20 decides the block length of the table data requested by a user based on the transfer unit set between a host computer 3 and a terminal equipment 1, and the attribute of a table. A table data multi-screen input part 21 reads the data of a necessary range out of the computer 3. When a table data holding control part 22 decides the presence of data in a table data store table 23, the data is reused. Furthermore the part 20 sets the block size at the value smaller than the screen size. When the data necessary for screens are not included in the table 23 any more, the new blocks are read into the table 23 with the screen operations of a user. Thus the transfer efficiency is improved for the data sent to the equipment 1 from the computer 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is used for transferring tabular data between a host computer and a terminal device. In particular, the present invention relates to a data conversion method for converting tabular data of a host computer into a format displayed by a terminal device.

〔overview〕

In a data conversion method that converts tabular data from a host computer into a format that can be displayed by a terminal device, the present invention reduces the amount of transferred data and utilizes the terminal device by temporarily storing and reusing data. This provides excellent operability for users.

[Conventional technology]

In order to output tabular data processed by an application program on a host computer to the screen of a terminal device, it is necessary to convert the data for the terminal device. For this reason, conventionally, data has been converted according to a predetermined screen object format using a communication program of a terminal device. In this case, tabular data for one screen is transferred with one operation for the user's screen sketch.

[Problem that the invention seeks to solve]

However, if the tabular data on the host computer side includes a lot of additional information such as ruled lines and colors, the amount of data to be transferred becomes enormous, and the response time to generate one screen becomes long. Furthermore, when transferring one screen at a time, it is not possible to control scrolling on a row-by-row or column-by-column basis, and there is a drawback that the superior functions of the terminal device cannot be utilized. Furthermore, since screen objects transferred to the terminal device are discarded after each operation, the amount of transferred data increases.
The drawback was that the response time was long.

It is an object of the present invention to provide a data conversion method that can solve the above problems, improve the efficiency of transferring tabular data from a host computer to a terminal device, and make use of the excellent functions of the terminal device. do.

[Means for solving problems]

The data conversion method of the present invention includes a block length determining means that divides tabular data from a host computer to optimize the transfer size to a terminal device, and a block length determining means that divides tabular data from a host computer to optimize the size of transfer to a terminal device. A multi-screen input means for receiving data from a host computer, a data holding means for temporarily storing data input to the multi-screen input means, and transmitting the data stored in the data holding means to the terminal device in response to a request from the terminal device. The present invention is characterized by comprising: a terminal screen transfer means for transferring data; and a data discard means for discarding data stored in the data holding hand sequentially from data requested from the terminal device in ascending order of the number of requests.

[For production]

Tabular data corresponding to multiple screens of the terminal device is received from the host computer, temporarily stored, and the data is transferred to the terminal device as necessary. At this time, since the data to be transferred is in tabular format, the tabular data on the host computer side is divided and transferred. This makes data transfer more efficient and data storage more efficient. In addition, by storing data from multiple screens, the response speed to the terminal device can be shortened, and the next data can be received from the host computer while the terminal device is displaying the screen, increasing the efficiency of data transfer. can be increased. Furthermore, memory can be used effectively by discarding items that are unlikely to be requested by the terminal device.

〔Example〕

FIG. 1 is a block diagram showing a data exchange system according to an embodiment of the present invention.

In this embodiment, a data exchange device 2 is provided on the terminal device 1 side in order to convert tabular data of the host computer 3 into a format displayed by the terminal device 1. The host computer 3 includes a database and a database processing unit.

Here, the feature of this embodiment is that the data exchange device 2 is provided with a tabular data block as a block length determining means for dividing the tabular data from the host computer 3 and optimizing the transfer size to the terminal device 1. The tabular data multiple screen input unit 21 is provided as a multiple screen input means for receiving multiple screens of data displayed by the terminal device 1 as one unit from the host computer 3. A tabular data retention management section 22 and a tabular data storage table 23 are provided as data storage means for temporarily storing data input to the terminal device 1. The terminal screen generation section 24, the table data index management section 25, the screen person output bar/sofa 26, and the terminal screen control section 27 act as terminal screen transfer means to transfer the data stored in the table data storage table 23 to the terminal screen. The table data discard unit 28 and the discard priority management unit 29 are provided as data discard means for discarding data in order of decreasing number of requests from the device 1.

FIG. 2 shows an example of dividing table data into blocks, and FIG. 3 shows an example of rules for determining block division.

The table data block length determination unit 20 determines whether the user
Regarding the table data requested from the host computer 3 and the terminal device 1, depending on the transfer unit and table attributes,
The block length is determined so that data storage on the terminal device 1 side can be made more efficient.

First, in the column direction, as shown in Figure 3(a),
Divide the table starting from the left end so that the total data length is a certain length or more and is the maximum.

However, if the data length of one column exceeds a certain length, one block of only that column is formed. As for the rows, as shown in Figure 3(b), starting from the top of the table,
Split by a certain number of lines. However, the number of rows in only the bottom block of the table can be set to less than a certain number. Each partitioned table is addressed by a block column address BCA and a block line address BLA.

FIG. 4 shows an example of the correspondence between tabular data on the host computer side and data in the tabular data storage table. The tabular data storage table 23 stores part of the tabular data, for example, as indicated by diagonal lines in FIG.

The tabular data multiple screen input unit 21 reads from the host computer 3 a range of data necessary for displaying the screen. At this time, if the tabular data retention management section 22 determines that the data exists in the tabular data storage table 23, that data is reused to reduce communication with the host computer 3. In addition, if the block size is set smaller than the screen size by the tabular data block length determining unit 20 and the data necessary for the screen disappears in the tabular data storage table 23 due to the user's screen operation, the data related to that screen A plurality of broncs in the range are newly read into the tabular data storage table 23. This allows the host
Data transfer from the computer 3 to the terminal device 1 and retention of the data are performed according to the trajectory of the user's screen sketch. This makes it possible to avoid unnecessarily increasing the amount of data to be transferred at one time and transferring data to portions of the screen that the user does not refer to.

The storage structure of the tabular data storage table 23 is shown in FIG.

The terminal screen generation unit 24 is the table data index management unit 2
5, the data necessary for screen display is extracted from the data stored in the table data storage table 23, a display screen is generated, and the data is stored in the screen output buffer 26. The table data index management unit 25 stores the table data storage table 2
3, and improves the efficiency of data retrieval by the terminal screen generation unit 24. As this index, a hash index using row addresses and column addresses as keys is used.

The terminal screen control unit 27 directly controls the screen of the terminal device 1 using the display screen stored in the screen output buffer 26. Furthermore, the terminal screen control unit 27 controls screen movement in rows or columns using arrow keys or the like.

When the amount of data stored in the table data storage table 23 exceeds the maximum retained data amount, the table data discard unit 28
Discard existing data block by block in order of lowest priority. The priority of the block to be discarded is determined by the discard priority management unit 2.
Managed by 9.

In the above embodiment, an example was shown in which the data conversion device was provided separately from the terminal device, but the present invention can be implemented in the same way even if the data conversion device is built into the terminal device.

〔Effect of the invention〕

As described above, the data conversion method of the present invention has the effect of making it possible to effectively utilize the memory on the terminal device side and also making effective use of its screen processing function. Furthermore, the amount of data transferred on the line can be reduced and response characteristics can be improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a data exchange system according to an embodiment of the present invention. FIG. 2 is a diagram showing an example of dividing tabular data into blocks. FIG. 3 is a diagram showing an example of block division determination rules. FIG. 4 is a diagram showing an example of the correspondence between tabular data on the host computer side and data in the tabular data storage table. FIG. 5 is a diagram showing the structure of a tabular data storage table. 1...Terminal device, 2...Data exchange device, 3...
Host computer, 20...Table data block length determination unit, 21...Table data multiple screen input unit, 22...
- Tabular data retention management unit, 23... Tabular data storage table, 24... Terminal screen generation unit, 25... Tabular data index management unit, 26... Screen input/output bath sofa, 2
7... Terminal screen control section, 28... Table data disposal section,
29... Disposal priority management department. ■ Gu

Claims (1)

[Claims] 1. In a data conversion method for converting tabular data from a host computer into a format to be displayed by a terminal device, the size of the tabular data from the host computer is divided and transferred to the terminal device. block length determining means for optimizing the data; multi-screen input means for receiving data from the host computer as one unit from the plurality of screens displayed by the terminal device; a terminal screen transfer means for transferring the data stored in the data holding means to the terminal device in response to a request from the terminal device; and a terminal screen transfer means for transferring the data stored in the data holding means to the terminal device; 1. A data conversion method comprising: data discarding means for discarding data in order of decreasing number of requests.