JP3016255B2 - Database management system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a database management system, and more particularly to a database management system for an LSICAD system.

[0002]

2. Description of the Related Art Conventionally, in this type of database management system, data access when storing and managing design data is performed in block units to be processed, and management in a management data file is also performed in block units. .

[0003]

In the above-mentioned conventional database management system, since data management is performed independently in block units, there is a disadvantage that hierarchical information between blocks cannot be managed.

[0004]

According to the present invention, there is provided a database management system comprising: a database in which design data at the time of LSI design is stored; a meta-database in which structure definition data of user data in the database is stored; In a database management system comprising a management data file for storing the version number and storage location of the user data and an access control unit for reading data structure definition data in the meta database and accessing the user data according to the data structure definition, The database stores data in units of management, the meta-database stores the data structure definition data and hierarchy information extraction data, the management data file stores the version number / storage location and hierarchy information, and the access control Section is the data structure definition data And accessing said design data accordingly reads hierarchical extraction data, and is configured with a hierarchical information extraction unit in the design data.

[0005]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of the database management system of the present invention. The database management system 1 reads the structure definition of the user data from the meta database 15 at the time of starting the application program, stores it in the metadata table 9 in the metadata control unit 8, and prepares for subsequent access. When data storage is started, the management data operation unit 4 reads the management data file 13 through the management data access unit 10 and determines the storage location of the target user data.

[0006] At the user data writing, the data operation unit 6, through database access unit 11 with reference to the information of the metadata table 9 shown in FIG. 2, and writes the user data to the database 14. At this time, if there is hierarchical information extraction data in the metadata, the hierarchical information extracting unit 7 determines the lower block name and issues a hierarchical information storage request to the hierarchical information storage unit 5 . The hierarchy information storage unit 5 writes the hierarchy information to the management data file 13 through the management data access unit 10 .

FIG. 2 is a configuration diagram for explaining the metadata of the present invention. The table information table 16 has information of a table of user data. The table information table 16 has a table name, a number added to the table, a hierarchy flag indicating the existence of hierarchy extraction data, and a pointer to the item information table. Item information table 1
7 has information on each item in the table. The item information table 17 has information on each item in the table. The item information table 17 has an item name, an item type, an item size, and a hierarchy flag. Here, if the hierarchy flag is ON, it means that the data corresponding to this item indicates a lower block name.

FIG. 3 is a configuration diagram for explaining management data according to the present invention. The block name table 18 is a list of information stored in the database, and has a block name, a version number, a storage position, and a hierarchy table pointer. The hierarchy table 19 is pointed to from the block name table, and includes the block names of the blocks located in the lower hierarchy,
Has version number.

FIG. 4 is a flowchart for explaining the operation of the access control unit of the present invention. When there is a user data write request, the one record write process 20 operates, and then the process proceeds to the storage table search process 21. After searching the storage table, the process proceeds to the table attribute check 22. Here, if the table has no hierarchy flag, the process immediately proceeds to the database access unit 26. If the table attribute check 22 indicates that the table has a hierarchy flag, the process proceeds to the item number repetition process 23.

After that, the number of items passes through the hierarchy flag check 24, and if the hierarchy flag is ON, the process proceeds to the hierarchy information adding process 25. In the hierarchy flag check 24, if the hierarchy flag is OFF, the process proceeds to the next item without doing anything. When all items are completed in the item number repetition process 23, the process proceeds to the database access unit 26.

Next, the operation of the database management system of the present invention will be described with a specific example. As shown in FIG. 2, there is one type of table “COMP”, the items of which are “CELL”, “NAME”, “X” and “Y”, and the hierarchy flag is ON for the item “NAME”. I do. At this time, a case where design data having a name “BLOCK-A” is stored will be considered.

When a record whose item “NAME” is “BLOCK-B” is given to the “COMP” table as data to be written, “BLOCK-B” is determined by the hierarchy flag check 24 according to the flow of FIG.
To the hierarchy information adding process. In the hierarchy information addition process,
“BLOCK-B” is added to the hierarchy table. Next, the item “NAME” is set to “BL” in the “COMP” table.
When a record of "CCK-C" is given, a record of "BLOCK-C" is added to the hierarchy table by similar processing, and management data as shown in FIG. 3 is generated.

[0013]

As described above , according to the present invention,
In Tedabesu management system for storing design data, automatically it is possible to extract a hierarchical information between data blocks in the inner <br/> portion of the access control unit, also hierarchical information extracted is an effect that can manage .

[Brief description of the drawings]

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

FIG. 2 is a diagram showing a structure of metadata of the present invention.

FIG. 3 is a diagram showing a structure of management data of the present invention.

FIG. 4 is a flowchart showing an operation of access control according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Database management system 2 Application interface 3 Access control part 4 Management data operation part 5 Hierarchical information storage part 6 Data operation part 7 Hierarchical information extraction part 8 Metadata control part 9 Metadata table 10 Management data access part 11 Database access part 12 Meta Database access unit 13 Management data file 14 Database 15 Metadatabase 16 Table information table 17 Item information table 18 Block name table 19 Hierarchical table 20 1 record writing start processing 21 Storage table search processing 22 Table attribute check 23 Item number repetition processing 24 Hierarchical flag Check 25 Hierarchical information addition processing 26 Database access processing

Claims (1)

(57) [Claims] 1. A database for storing design data at the time of LSI design, a meta-database for storing structure definition data of user data in the database, and a version number and storage location of the user data in the database. In a database management system including a management data file and an access control unit that reads data structure definition data in the meta database and accesses user data in accordance with the data structure definition, the database stores data in units of management. The meta-database stores the data structure definition data and the hierarchy information extraction data, the management data file stores the version number / storage location and the hierarchy information, and the access control unit stores the data structure definition data and the hierarchy extraction data. Read the data and follow this A database management system for accessing design data and having a hierarchy information extraction unit in the design data.