JPS62182948A - Stretching system for compressed or attribute-converted record - Google Patents

Abstract

PURPOSE:To stretch and transfer a compressed or attribute-converted record to a record having a form for a user at a high speed, by generating and preparing in advance a record transfer instruction on a memory in a sequence of a field which constitutes the record. CONSTITUTION:A record transfer means 4, when the input instruction of the record is issued from a program, transfers a control from an input/output control monitor 10 to an instruction generating area 8 generated in advance on a memory 7 with a transfer instruction generating means 3. By transferring the control, the record transfer means 4 in the input/output control monitor 10 stretches a compressed or attribute-converted record 13 in a data base 6 to the record like a record 14 having for the form for the user use in a sequence flow of a process, and transfers it to a user record area 9. Afterwards, the control is returned to the input/output control monitor 10, and hereafter, at every issuing of the input instruction of the record, the record transfer means 4 stretches and transfers the compressed or attribute-converted record 13.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a compression or attribute conversion record expansion method for expanding compressed or attribute converted records in a database system and transferring the compressed or attribute converted records to a program.

[Conventional technology]

Conventionally, when transferring compressed or attribute-converted records to a program in a database system, the record structure definition information in the directory is used to analyze this information each time records are transferred, and the records are compressed or attribute-converted. Each field was restored to an enlarged user-format record using a transfer method that matched the field attributes.

[Problem that the invention seeks to solve]

In the conventional method described above, when transferring a compressed or attribute-converted record to a program, it always checks the field attributes and uses a transfer method that matches the attributes. As the number of records increases, it takes more time to enlarge the records, which reduces efficiency.

[Means for solving problems]

The compression or attribute conversion record enlargement method of the present invention includes a record definition information storage means that defines a record structure and stores it in a directory, and a storage medium F that compresses or converts attributes of user format records based on record definition information in a directory E. a record storage means for storing a record in the directory, a transfer command generation means for generating in advance an instruction to enlarge and transfer the record to its original form by referring to the record definition information in the directory, It has a record transfer means for enlarging the record into a shape and transferring the record to the user record area.

In this way, by generating and preparing record transfer instructions that match the field attributes for each field of a record used in a program in advance in memory in the order of the fields that make up the record, when reading a record, the can be compressed or transferred without examining the attributes of the file.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the compressed or attribute-converted record expansion method of the present invention, FIG. 2 is an explanatory diagram of the instruction generation area 8, and FIG. 3 is a compressed or attribute-converted record 1.
3 is an explanatory diagram of the relationship between records in user record format 14 and user record format 14.

In this embodiment, a record definition information storage means 1 stores information such as field attributes and lengths in a directory 5 in a database system, and a database 6 stores records whose fields have been compressed or whose attributes have been converted based on the record definition information on the directory 5. and record definition information stored in the directory 5, the command generation area of the memory 7 generates a command to check the attributes of each field and expand the compressed or attribute-converted record to its original form. A transfer command generating means 3 generated in advance in the input/output control monitor 10 executes the above-generated transfer command and converts the compressed or attribute-converted records read from the database 6 into the original form. It is comprised of a record transfer means 4 for enlarging the data and transferring it to the user record area 9 of the memory 7.

If the record consists of n fields as shown in FIG.
．． . . . In order of field n, transfer commands matching the attributes of the fields of the record definition information are generated in the command generation area 8. The record transfer means 4 generates an instruction to set a condition code 11 to indicate that the compressed or attribute-converted record 13 of FIG. 3 has been correctly expanded to the original user record format 14. Finally, when the record transfer is completed, the record transfer means 4 generates a return instruction 12 so that control is returned to the input/output control monitor 10 since the control has been transferred from the input/output control monitor 10 of the database to the instruction generation area 8.

As described above, the record transfer means 4 transfers control from the input control monitor 10 to the instruction generation area 8 generated in advance in the memory 7 by the transfer instruction generation means 3 when a record input instruction is received from the program. , the record transfer means 4 of the input/output control monitor 10 expands the compressed or attribute-converted records 13 of the database 6 into user format records 14 through a series of processing steps, and transfers them to the user record area 9. . Thereafter, control returns to the input/output control monitor 10, and if there is a subsequent record input command, the record 13 compressed or attribute-converted by the record transfer means 4 is enlarged and transferred.

〔Effect of the invention〕

As explained above, the present invention generates and prepares record transfer instructions matching the field attributes for each field of a record used in a program in advance in memory in the order of the fields that make up the record. This has the effect of rapidly enlarging and transferring compressed or attribute-converted records to user-format records without checking field attributes when reading.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the compressed or attribute-converted record expansion method of the present invention, FIG. 2 is an explanatory diagram of the instruction generation area 8, and FIG. 3 is a compressed or attribute-converted record 1.
3 and a user format record 14. FIG. 1...Record definition information storage means, 2...
... record storage means, 3 ... transfer command generation means, 4 ... record transfer means, 5 ... directory, 6 ... database, 7 ... ...Memory, 8...Instruction generation area, 9...User record F11 area. lO...Input/output control monitor. 11... Condition code, 12...
...Return instruction, 13...Record compressed or attribute converted,
14...User format record. Figure 2

Claims (1)

[Claims] In a database system, record definition information storage means defines a record structure and stores it in a directory, and records in a user format are compressed or attribute converted based on the record definition information on the directory and stored on a storage medium. a record storage means for storing a record in the directory; a transfer command generation means for generating in advance a command to enlarge and transfer the record to its original form by referring to record definition information in the directory; A compression or attribute conversion record enlargement method having record transfer means for enlarging the record and transferring the record to a user record area.