JPH07295874A - Cad system - Google Patents

Abstract

PURPOSE:To eliminate the time needed for stopping the service by restoring a 1st drawing data base after an access is finished to a 2nd drawing data base if a failure is detected when an access is given to the 1st drawing data base. CONSTITUTION:If a failure is detected when the accesses are secured between an external storage 5 or a drawing storage 13 and the drawing data bases 17 and 18 which store the same drawing data, a data base management part 15 performs the changeover between both bases 17 and 18 based on the contents of a drawing management part 16. When the access is finished between the switched drawing data base and the storage 5 or the storage 13, the part 15 restores toe drawing data base having the failure in the background of a normal access given to the switched drawing data base. Thus the failure drawing data base can be instantaneously switched to the nondefective one. As a result, a user can use both data bases 17 and 18 regardless of occurrence of a failure and with no stop time caused for use of these data bases.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a CAD system,
In particular, it relates to a method for restoring a drawing database that stores drawing data.

[0002]

2. Description of the Related Art Conventionally, in a CAD system, created drawing data or referenced drawing data is stored in one drawing database, and the contents of the drawing database are stored in an external storage device.

Therefore, when a failure occurs in the drawing database, the drawing data stored in the external storage device is read into the drawing database and copied.
The drawing database is being restored.

[0004]

SUMMARY OF THE INVENTION Conventional CAD described above
In the system, when a failure occurs in the drawing database, the drawing data stored in the external storage device is read and copied to restore it, so it takes time to read the drawing data from the external storage device. During that time, the use of the drawing database must be stopped.

Further, when the drawing data is updated, the updated drawing data must be stored also in the external storage device, and the drawing database cannot be restored without the drawing data in the external storage device.

Therefore, the object of the present invention is to solve the above-mentioned problems, to allow the user of the drawing database to be aware of the occurrence of a failure and to eliminate the use stop time, so that there is no drawing data in the external storage device. Even so, it is to provide a CAD system capable of restoring the drawing database.

[0007]

A CAD system according to the present invention stores first and second identical drawing data, respectively.
Drawing database, and switching means for switching to access to the second drawing database when a failure is detected during access to the first drawing database.
And a means for restoring the first drawing database after the access to the second drawing database is completed at the time of switching by the switching means.

In addition to the above structure, another CAD system according to the present invention stores drawing information indicating drawing data accessed to the drawing database switched by the switching means when the failure occurs. A storage means is provided.

In another CAD system according to the present invention, in addition to the above-mentioned structure, a storage means for temporarily storing the drawing data accessed to the drawing database switched by the switching means when the failure occurs. The drawing database is restored based on the contents of the storage means.

Still another CAD system according to the present invention has, in addition to the above-mentioned configuration, means for holding information for specifying the drawing database in which the failure has occurred, and information for specifying the drawing database currently in use. Means, and the drawing database is switched by the switching means based on these information.

[0011]

When the database management unit detects a failure when accessing the external storage device or drawing storage unit and a plurality of drawing databases, the database management unit switches the drawing databases based on the contents of the drawing management unit.

Upon completion of access to the switched drawing database and the external storage device or drawing storage unit, the database management unit restores the failed drawing database in the background of normal access to the switched drawing database.

Thus, even if a failure occurs, the normal drawing database can be immediately switched to, so that the user of the drawing database is not aware of the occurrence of the failure and there is no downtime.

Further, since the plurality of drawing databases are always kept the same, it is possible to restore the failed drawing database by the normal drawing database even if the external storage device has no failed drawing data. Becomes

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. In the figure, the CAD system 1 includes a function selection unit 11, a drawing creation / editing unit 12, and a drawing storage unit 13.
, Plotter output unit 14 and database management unit 15
And a drawing management unit 16 and drawing databases 17 and 18.

The function selecting section 11 is provided with a drawing creating / editing section 12 and a plotter output section 1 according to a command input from the input device 2.
4 and the database management unit 15 are selected. Further, the function selection unit 11 is the drawing creation / editing unit 12
The drawing data handled by the plotter output unit 14 and the database management unit 15 are displayed on the display unit 3.

The drawing creation / editing unit 12 generates shape data such as a straight line, a circle, or characters in accordance with an input from the input device 2 which is input while looking at the display screen of the display unit 3, and a drawing including the shape data. Edit the data. The drawing storage unit 13 temporarily stores the drawing data created and edited by the drawing creation and editing unit 12.

When the plotter output command is input from the input device 2, the plotter output unit 14 reads the drawing data stored in the drawing storage unit 13 or the drawing databases 17 and 18 and outputs the drawing data to the plotter 4 to output a predetermined paper. Plot above.

The database management unit 15 is a drawing storage unit 13.
Database 17 and 18 of drawing data temporarily stored in the external storage device 5 and drawing data stored in the external storage device 5.
And drawing data stored in the drawing databases 17 and 18 are read and stored in the drawing storage unit 13 and the external storage device 5.

The drawing management unit 16 is a database management unit 15.
Drawing database 1 for reading and storing drawing data
It manages the exchange of drawing data in 7 and 18, and stores the management information of the drawing databases 17 and 18.

FIG. 2 is a diagram showing the structure of the management information table of the drawing management unit 16 of FIG. In the figure, the management information table 16a includes a used database name storage area 16b,
It is composed of a failure database name storage area 16c and a failure drawing name storage area 16d.

The used database name storage area 16b stores a used database name indicating a drawing database currently in use, and the failure database name storage area 16c stores a failure database name indicating a drawing database in which a failure has occurred.

The failure drawing name storage area 16d is a drawing database of the usage database name stored in the usage database name storage area 16b and the failure database name storage area 1
When the fault database name stored in 6c is switched to the drawing database, the drawing data newly referenced or stored in the drawing database of the used database name between the switching and the restoration process. , That is, faulty drawing name A indicating the faulty drawing data
Store ~ N.

FIGS. 3 to 8 show the database management unit 1 of FIG.
6 is a flowchart showing the operation of FIG. The operation of the embodiment of the present invention will be described with reference to FIGS.

The input device 2 is, for example, a keyboard, a touch panel, a mouse, a stylus pen, or the like. Various commands are input from the input device 2 to the CAD system 1.
Function selection unit 11 selects one of the drawing creation / editing unit 12, plotter output unit 14, and database management unit 15 in accordance with the contents of the command.

The function selection unit 11 displays the drawing data handled by the selected circuit as image data on the display unit 3, outputs it to the plotter 4 for printing, or stores it in the external storage device 5.

That is, when the function selecting section 11 receives an instruction to select the drawing creating / editing section 12 from the input device 2,
The drawing creation / editing unit 12 is called. The drawing creation / editing unit 12 creates and edits shape data such as straight lines, circles, and characters in the drawing storage unit 13 in accordance with a command input from the input device 2.

The operator inputs various commands from the input device 2 while looking at the image data displayed on the display unit 3 to create and edit necessary shape data, that is, shape data according to the various commands.

Further, the function selection unit 11 calls the plotter output unit 14 when a command for selecting the plotter output unit 14 is input from the input device 2. If the drawing data to be output to the plotter 4 is in the drawing storage unit 13, the plotter output unit 14 reads the corresponding drawing data from the drawing storage unit 13 and outputs it to the plotter 4.

If the drawing data to be output to the plotter 4 does not exist in the drawing storage unit 13, the plotter output unit 14 passes through the database management unit 15 and the drawing management unit 16 the drawing that is currently in use among the drawing databases 17 and 18. The data is read and output to the plotter 4.

The plotter 4 plots a drawing on a predetermined sheet based on the drawing data sent from the plotter output unit 14.

Further, the function selecting section 11 calls the database managing section 15 when a command for selecting the database managing section 15 is inputted from the input device 2. The database management unit 15 determines whether the command from the input device 2 is reading the drawing data from the external storage device 5, storing the drawing data in the external storage device 5, reading the drawing data, or storing the drawing data, respectively. (FIG. 3, steps S1 to S4).

Next, the database management unit 15 determines whether the drawing databases 17 and 18 have been switched in each of the above processes (step S5 in FIG. 3), and if the drawing databases 17 and 18 have not been switched. It is determined whether the processing is completed (step S7 in FIG. 3). The database management unit 15 ends the process if the process is completed, and returns to step S1 if the process is not completed.

On the other hand, if the drawing databases 17 and 18 are switched, the database management unit 15 causes a drawing name referred to or stored, that is, a failure occurs between the switching and the restoration process is started. The faulty drawing name storage area 16 of the management information table 16a
Write to d and start the recovery process (step S in FIG. 3).
6).

After that, the database management unit 15 determines whether the processing is completed (step S7 in FIG. 3). If the processing is completed, the database management unit 15 terminates the processing, and if the processing is not completed, the processing returns to step S1.

When the database management unit 15 determines in the above determination that the command from the input device 2 is the reading of the drawing data from the external storage device 5, the management information table 16a.
The database name of the drawing database currently in use is fetched from the used database name storage area 16b (step S8 in FIG. 4).

The database management unit 15 reads the drawing data from the external storage device 5 into the drawing database currently in use (step S9 in FIG. 4). At this time, the database management unit 15 determines whether a failure has occurred in reading the drawing data from the external storage device 5 (step S1 in FIG. 4).
0).

The database management unit 15 is the external storage device 5.
If there is no failure in reading the drawing data from, the process proceeds to the determination in step S5.

The database management unit 15 is the external storage device 5.
If a failure occurs in reading the drawing data from the, the currently used drawing database is switched to the waiting drawing database (step S11 in FIG. 4).

That is, the database management unit 15 uses the database name storage area 16 of the management information table 16a.
The database name of the drawing database currently in use is retrieved from b and written in the failure database name storage area 16c.

Subsequently, the database management unit 15 writes the database name of the drawing database in the standby state in which no failure has occurred in the used database name storage area 16b of the management information table 16a.

The database management unit 15 stores the external storage device 5 in the drawing database having the database name written in the used database name storage area 16b of the management information table 16a.
The drawing data is read from (step S12 in FIG. 4). After that, the database management unit 15 proceeds to the determination of step S5.

If the database management unit 15 determines in the above determination that the command from the input device 2 is to store the drawing data in the external storage device 5, the management information table 16
The database name of the drawing database currently in use is retrieved from the used database name storage area 16b of a (step S13 in FIG. 5).

The database management unit 15 stores the drawing data from the currently used drawing database in the external storage device 5 (step S14 in FIG. 5). At this time, the database management unit 15 determines whether or not a failure has occurred in storing the drawing data in the external storage device 5 (step S1 in FIG. 5).
5).

The database management unit 15 is the external storage device 5.
If there is no failure in storing the drawing data in, the process proceeds to the determination in step S5.

The database management unit 15 is the external storage device 5.
If a failure occurs in storing the drawing data in the drawing database, the drawing database currently in use is switched to the waiting drawing database (step S16 in FIG. 5).

That is, the database management unit 15 uses the database name storage area 16 of the management information table 16a.
The database name of the drawing database currently in use is retrieved from b and written in the failure database name storage area 16c.

Next, the database management unit 15 writes the database name of the drawing database in the standby state in which no failure has occurred in the used database name storage area 16b of the management information table 16a.

The database management unit 15 stores the drawing data in the external storage device 5 from the drawing database having the database name written in the used database name storage area 16b of the management information table 16a (step S17 in FIG. 5). After that, the database management unit 15 proceeds to the determination of step S5.

Further, when the database management unit 15 determines in the above determination that the command from the input device 2 is a command for reading drawing data, the drawing database currently used from the used database name storage area 16b of the management information table 16a. Database name (step S1 in FIG. 6)
8).

The database management unit 15 reads the drawing data from the drawing database currently in use into the drawing storage unit 13 (step S19 in FIG. 6) and displays the drawing data on the display unit 3. At this time, the database management unit 1
Reference numeral 5 determines whether or not a failure has occurred in reading the drawing data into the drawing storage unit 13 (step S20 in FIG. 6).

The database management unit 15 is the drawing storage unit 13
If there is no failure in reading the drawing data into, the process proceeds to the determination in step S5.

The database management unit 15 is the drawing storage unit 13
When a failure occurs in reading the drawing data into the drawing database, the drawing database currently in use is switched to the waiting drawing database (step S21 in FIG. 6).

That is, the database management unit 15 uses the database name storage area 16 of the management information table 16a.
The database name of the drawing database currently in use is retrieved from b and written in the failure database name storage area 16c.

Subsequently, the database management unit 15 writes the database name of the drawing database in the standby state in which no failure has occurred in the used database name storage area 16b of the management information table 16a.

The database management unit 15 determines the drawing storage unit 1 from the drawing database having the database name written in the used database name storage area 16b of the management information table 16a.
3 is loaded with the drawing data (step S22 in FIG. 6). After that, the database management unit 15 proceeds to the determination of step S5.

Furthermore, when the database management unit 15 determines in the above determination that the command from the input device 2 is the drawing data storage command, the drawing currently used from the used database name storage area 16b of the management information table 16a. Extract the database name of the database (Fig. 7 Step S)
23).

The database management unit 15 stores the drawing data from the drawing storage unit 13 in the drawing database currently in use (step S24 in FIG. 6). At this time, the database management unit 15 determines whether a failure has occurred in storing the drawing data from the drawing storage unit 13 (step S2 in FIG. 6).
5).

The database management unit 15 is the drawing storage unit 13
If there is no failure in the storage of the drawing data from 1), the process proceeds to the determination in step S5.

The database management unit 15 is a drawing storage unit 13.
If a failure occurs in the storage of the drawing data from (1), the currently used drawing database is switched to the waiting drawing database (step S26 in FIG. 7).

That is, the database management unit 15 uses the database name storage area 16 of the management information table 16a.
The database name of the drawing database currently in use is retrieved from b and written in the failure database name storage area 16c.

Subsequently, the database management unit 15 writes the database name of the drawing database in the standby state in which no failure has occurred in the used database name storage area 16b of the management information table 16a.

The database management unit 15 stores the drawing storage unit 13 in the drawing database having the database name written in the used database name storage area 16b of the management information table 16a.
The drawing data is stored (step S27 in FIG. 7). After that, the database management unit 15 proceeds to the determination of step S5.

If no problem occurs in reading the drawing data and storing the drawing data, the database management unit 15 returns the control to the function selecting unit 11 after the above processing is completed, and then the background processing is executed. The drawing data stored in the database is copied to another drawing database which is not currently used, and the drawing databases 17 and 18 are kept the same.

When the drawing databases 17 and 18 are switched and the restoration process is started in step S6, the database management unit 15 terminates the above process and returns control to the function selection unit 11 and then performs the background process. Then, the following processing is performed.

The database management unit 15 stores the used database name in the used database name storage area 16b of the management information table 16a, and the failure database name storage area 16c.
The failure database names are extracted from the respective fields, and the failure drawing names A to N are extracted from the failure drawing name storage area 16d (step S28 in FIG. 8).

The database management unit 15 reads the drawing data indicated by the faulty drawing names A to N in the faulty drawing name storage area 16d from the currently used drawing database, and corresponds the drawing data of the faulty drawing database. Copies are sequentially made to the positions (step S29 in FIG. 8).

The above processing is repeatedly executed until the faulty drawing names A to N in the faulty drawing name storage area 16d are exhausted (steps S28 to S30 in FIG. 8), and when all the faulty drawing names A to N have been copied, the fault database name is obtained. The contents of the storage area 16c and the failure drawing name storage area 16d are deleted (step S31 in FIG. 8), and the recovery process ends.

FIG. 9 is a block diagram showing the configuration of another embodiment of the present invention. In the figure, the other embodiment of the present invention has the same configuration as that of the embodiment of the present invention shown in FIG. 1 except that the drawing temporary storage unit 19 is provided, and the same components are designated by the same reference numerals. There is.

The drawing temporary storage unit 19 temporarily stores the drawing data stored in the drawing database currently in use from the external storage device 5 or the drawing storage unit 13 when no failure occurs in each of the above processes. The drawing data temporarily stored in the drawing temporary storage unit 19 is copied to another drawing database which is not currently used in the background processing.

Further, when a failure occurs in each of the above processes, the drawing temporary storage unit 19 stores the external storage device 5 or the drawing storage after the switching of the drawing databases 17 and 18 until the restoration process is activated. The drawing data stored in the drawing database switched from the unit 13 or the drawing data read from the switched drawing database into the external storage device 5 or the drawing storage unit 13 is temporarily stored.
The drawing data temporarily stored in the drawing temporary storage unit 19 is copied to the drawing database in which the failure has occurred in the background processing.

In this way, when a failure is detected during access to one of the two drawing databases 17 and 18 that respectively store the same drawing data, the database management unit 15 selects one of the drawing databases 17 and 18 from each other. By switching to access to the other drawing database, and after the access to the other drawing database is completed by the background processing by the database management unit 15, the one of the drawing databases in which the failure has occurred is restored. It is possible for the user to eliminate the use stop time without being aware of the occurrence of a failure, and it is possible to restore the drawing databases 17 and 18 even if there is no drawing data in the external storage device 5.

It should be noted that, although one embodiment and another embodiment of the present invention have described the case where two drawing databases 17 and 18 are used, it is obvious that the present invention can be applied to a case where three or more drawing databases are used. Yes, but not limited to this.

[0075]

As described above, according to the present invention, the first and second drawing databases storing the same drawing data respectively are provided, and when a failure is detected when accessing the first drawing database. By switching to the access to the second drawing database and restoring the first drawing database after the access to the second drawing database is completed, the user of the drawing database is aware of the occurrence of a failure. There is an effect that the use stop time can be eliminated without doing so, and the drawing database can be restored even if there is no drawing data in the external storage device.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a configuration of a management information table of a drawing management unit in FIG.

FIG. 3 is a flowchart showing an operation of a database management unit in FIG.

FIG. 4 is a flowchart showing the operation of the database management unit of FIG.

5 is a flowchart showing the operation of the database management unit of FIG.

FIG. 6 is a flowchart showing the operation of the database management unit in FIG.

FIG. 7 is a flowchart showing the operation of the database management unit in FIG.

FIG. 8 is a flowchart showing the operation of the database management unit in FIG.

FIG. 9 is a block diagram showing the configuration of another embodiment of the present invention.

[Explanation of symbols]

 1 CAD system 2 input device 3 display unit 4 plotter 5 external storage device 11 function selection unit 13 drawing storage unit 15 database management unit 16 drawing management unit 17, 18 drawing database unit 19 temporary drawing storage unit

Claims (4)

[Claims] 1. A first and a second drawing database for respectively storing the same drawing data, and a switch to access to the second drawing database when a failure is detected when accessing the first drawing database. A CAD system comprising: switching means and means for restoring the first drawing database after the access to the second drawing database is completed at the time of switching by the switching means. 2. The storage device according to claim 1, further comprising storage means for storing drawing information indicating drawing data accessed to the drawing database switched by the switching means when the failure occurs. CAD system. 3. Restoration of the drawing database based on the contents of the storage means, including storage means for temporarily storing drawing data accessed to the drawing database switched by the switching means when the failure occurs. The CAD system according to claim 1 or 2, characterized in that 4. The switching means comprises means for holding information for specifying the drawing database in which the failure has occurred and means for holding information for specifying the drawing database currently in use. The CAD system according to any one of claims 1 to 3, wherein the CAD database is switched.