register.hlp

prolog,人工智能推理程序,运行环境prolog

The register project is a finished example demonstrating a register
database system using an external database. In it we try to showcase
most of the new facilities in version 2.0, including:

External Databases and the B+Trees;

The Trap Predicate, used in the database output routines to
allow interruption of long listings;

The New Format predicate, used by the output routines;

Local Databases;

turning off the break-test in critical places;

A framework for maintaining a secure database system is
implemented by maintaining a log file where all changes to the
database are recorded. With this log file and a backup of the
database it is possible to construct a system where data is never
lost.

If the log file updating is disabled and the database is not
flushed after each update, execution will be many times faster;
therefore feel free to remove it if you prefer speed to
security.

In order to produce a more attractive demonstration, we have used
some of the routines from the TOOLBOX (screen handler, menu tools
and line input); in particular, the screen handler is needed to
do full-screen input. We hope you like the tools so much that you
feel enticed to buy the TOOLBOX; in it you will find dozens of 
other tools, including several standard menu predicates implementing 
menus identical to the ones in the register system and the Turbo 
Prolog system, a description on how to use and modify the screen 
handler, a virtual screen handler where the input form can be much 
larger than the actual screen, and a screen painter with which you 
may interactively design your own screen forms.


The program maintains two different database relations:

A city register which stores city names together with zip codes.
      
A person register with a persons First name, Last name, Address,
and a number of interests for these persons.

When an address for a person is typed in, only a zip code is
requested. The city name is automatically picked from the city
relation, with a key_search on the zip code.

The program maintains two B+ Trees; people are indexed on their
names, and cities are indexed on their zip codes. In the browser,
records are retrieved in sorted order, and you therefore move
forward and backward in the records in sorted order.

During input, a number of comma-separated codes may be entered
for each person in the 'person code' field. During output
(printout) these codes may then be used to pick out people with
codes matching one or more requirements.

In order to use the program you must first compile the project.
The easiest way to do this is by placing all the files mentioned
below in the current directory, and then choosing 'compile
project' from the main menu; the project is named 'register.prj'. 
You may then leave the Turbo Prolog system, and run 'register.exe'
as a stand alone program. Please note that if your setup
specifies the .OBJ directory to be other than the current
(source) directory, which isn't a bad idea, you'll have to move
the scrhnd.obj and register.sym files to this directory before
compilation.


The files in the register project are:

register.prj   \The project definition.

globals.pro    \The global definitions for the project.

main.pro       \User interface / main program.

browser.pro    \A database record browser.

prnhnd.pro     \Some printer utilities.

scrhnd.obj     \A compiled version of the screen handler from
                the toolbox.

register.sym   \The .SYM file from compiling scrhnd.obj, 
                This must be used if scrhnd.obj is used.

refshnd.pro   \A module to generate SCRHND.OBJ.

menu2.pro     \Some menu tools.

lineinp.pro   \An extended line input driver.

tpreds.pro    \Utility predicates.

tdoms.pro     \General domain definitions.

register.bin  \The binary database.

register.log  \The update log file.

register.zup  \Saved setup.

register.hlp  \This file.