TweetFollow Us on Twitter

May 91 Letters
Volume Number:7
Issue Number:5
Column Tag:Letters

HyperCard Letters

By Kirk Chase, Editor

Databases views

Paul Whittington

Vice-President

Griffin Software, Inc.

1790 Vermont Dr., Elk Grove, Illinois 60007

708/ 893-7238

I was astonished to learn from Mr. Joseph Terry, Jr. that the first “real” database has just arrived in the Mac world. I think Oracle Corporation also must be surprised to hear that they do not have a “real” database.

Mr. Terry writes, “Remember that those old guys and gals really DID know something.” As one of those old guys with over 15 years of experience in data processing (that shows you how old I am - I still refer to it as data processing), I have had experience with databases from mainframes to micros.

In both his letter in the January, 1991 issue of MacTutor and his article in the February, 1991 issue, Mr. Terry expresses his opinion that a network database model is the best type of database for “serious” database systems. I think that a more enlightened opinion is that each database model has its strengths and weaknesses, and that a database’s appropriateness is dependent on the application employing it.

In a hierarchical database, data is linked from parent to child with the constraint that each child can have only one parent. The limitation is that you can only arbitrarily traverse the database from top to bottom. This works well when all of your data has a one to many relationship and has very few levels in the hierarchy. For example, an order system might have an order header with name and address information. Each order header can then point down to a line item for that order. This causes no problems because the line item is meaningless without the order header.

Hierarchical databases have been around since the late sixties. Network databases became popular after the Data Base Task Group of the Conference on Data Systems Languages (CODASYL-DBTG) issued a report defining a data management system that supports a complete network structure (April 1971). Since Mr. Terry did a thorough job explaining the network database structure, I won’t repeat that here. The big advantage that a network database has over a hierarchical one is that a child record can have more than one parent record and that you can go up and down between children and parents to your heart’s content. The disadvantage is that it is real easy to get lost in the database if you are not careful.

The relational database model is based on research done by E.F. Codd. The model is based on the mathematical foundation of relational algebra, which gets into relations, domains, degrees, and tuples. A more easily understood description defines a relation as a table with columns representing fields and rows representing records. Many of today’s popular databases are built on the relational foundation. The strength of a relational database is in its ability to extract and combine data in many flexible ways. Its disadvantage has always been the processing overhead that it imposes.

The best use of a relational database is in situations where you cannot anticipate the end-user’s needs. A database with sales information is a great example of the need for a relational database. Marketing people love to aggregate data by weird demographic information.

Furthermore, no database product conforms exclusively to any one model. Even Mr. Terry refers to his product as a network database with relational extensions. Every database product on the market has “extensions” to take advantage of features from another model.

I think that when we talk about “serious” databases, we are talking multi-user, client-server stuff. Mr. Terry should look at the Database Access Manager for System 7. This is going to have a huge influence on how applications access databases. It also defines how a database server must look to its clients and, more specifically, how Macintosh databases must look to applications.

(And now a word from our sponsor.)

For the past two years Griffin Software has had two database engines for the Macintosh that use HyperCard as a front end. HyperHIT is based on the hierarchical database model with a few whiz-bang extensions thrown in. HyperHIT-R is based on the relational database model. Both are available now through our publisher, SoftStream International, Inc. Currently in beta is the multi-user version which supports both HyperHIT and HyperHIT-R files. The expected release date for HyperHIT-N is the month of April.

Both HyperHIT and HyperHIT-R were designed with HyperCard in mind. They don’t have fixed length fields. They store data, except for sounds and pictures, as ASCII text, just as HyperCard does. HyperHIT-R allows for dynamic modifications of the database structure, without using separate utility programs (importData and exportData are two of the XCMDs). HyperHIT-R also allows for those bizarre queries that those marketing people think up. (Can you tell which users give me the most sleepless nights?) Such as, “all of the people in Illinois, Indiana and Iowa who have purchased the book DRUG USE IN THE WORKPLACE but have not purchased the book BODY FLUIDS”.

We would appreciate the opportunity to present an article showing our products’ strengths, as you have afforded to Mr. Terry.

[You are perfectly welcomed and urged to submit an article on your product. In today’s world, even small products must be strong to compete. Many people have turned to different aids to help them get more “bang for the buck”. Products like yours, Mr. Terry’s, MacApp, etc. are all out there for developers to use. Only desperate developers, though, purchase products they know little about, they do so in hopes the products will aid their effort. It is therefore imperative to have products reviewed and advertised.-ed]

Listing Correction

Kirk Chase

MacTutor

The header file “CRemoveLFApp.h” was inadvertently left out of Wade Maxfield’s article, “Designing With Objects” in the January 1991 MacTutor. Below is the listing.

/* 1 */

/*****
 * CRemoveLFApp.h
 *
 * Application class for a typical application.
 *
 *****/

#define _H_CRemoveLFApp   /* Include this file only once */
#include <CApplication.h>

struct CRemoveLFApp : CApplication 
 {
 /* No instance variables */

 void IRemoveLFApp(void);
 void SetUpFileParameters(void);
 void DoCommand(long theCommand);
 void Exit(void);
 void CreateDocument(void);
 void OpenDocument(SFReply *macSFReply);
 void Run(void); /* override of built in method */
};

Strip Style FKEY

Thomas Nielsen

Vacaville, CA

Lately, I’ve found myself repeatedly frustrated by the simple operation of copying and pasting text in HyperCard 2.0. The problem occurs when I go to paste the text. It seems that HyperCard (many other applications) now copy the style of the text as well as the text itself. This is great until you have to go to the different menus to set the font, size, and style. Here is the code for a short little FKEY that strips away the style from the scrap, leaving only text.

/* 2 */

Handle NewClearSysHandle(long size){
 asm{
 move.l size,d0
 NewHandleCLEAR+SYS
 move.l a0,d0
 }
 }
 
void main(void){
 long scrapsize, offset;
 Handle h;
 
 scrapsize=0L;
 h=0L;
 if (!(h=NewClearSysHandle(0)))
 goto returnpoint;
 scrapsize=GetScrap(h,’TEXT’,&offset);
 if (scrapsize>0){ 
 SetHandleSize(h,scrapsize+(scrapsize &1)); /*make Handle even size*/
 ZeroScrap();
 PutScrap(scrapsize,’TEXT’,*h);
 SystemEdit(3); /*  Tricky part */
 }
returnpoint:
 if (h)
 DisposHandle(h);
 }

See the call to SystemEdit(3)? Well it took me FOREVER to figure that one out. The system won’t recognize that the scrap has changed until you do it. I hope I’m not the only programmer out there that’s had problems with this one!

For Think C project

 Project type->Code Resource
 Type:  FKEY (all capitols)
 ID:  7 (this is also the number key that invokes FKEY)
 Attrs:  20 (purgable)
 File Type:  rsrc (ResEdit)
 Creator:  RSED (ResEdit)
 Name:  Strip Style FKEY

[The full project and listing are included in this month’s source disk.-ed]

Multi-user AppleTalk For HyperCard

Kirk Chase

MacTutor

Epsi Computer Systems, Inc. has announced epsiTalk. This is a development tool for adding AppleTalk support for HyperCard 2.0. Using epsiTalk, you can incorporate distributive processing and file serving among network stations. This makes it ideal for work groups, conferencing, and multi-user applications. There are two versions, epsiTalk and epsiTalk-EZ selling for $175 and $395 respectively.

EpsiTalk has the ability of creating quick, distributive processing by allowing you to control other epsiTalk entities on other, idle Macintoshes. It comes equipped with tools for handling file transfers and access. EpsiTalk also supports aborting and clearing transmissions midstream.

For more information, contact Robert Eppich or Randy Young at

Epsi Computer Systems, Inc.

209-1255 56th Street

Delta, British Columbia V4L 2B9

Canada

(604) 943-8664

 
AAPL
$116.57
Apple Inc.
+0.26
MSFT
$48.70
Microsoft Corpora
+0.00
GOOG
$538.89
Google Inc.
+4.06

MacTech Search:
Community Search:

Software Updates via MacUpdate

Cyberduck 4.6 - FTP and SFTP browser. (F...
Cyberduck is a robust FTP/FTP-TLS/SFTP browser for the Mac whose lack of visual clutter and cleverly intuitive features make it easy to use. Support for external editors and system technologies such... Read more
Maya 2015 - Professional 3D modeling and...
Maya is an award-winning software and powerful, integrated 3D modeling, animation, visual effects, and rendering solution. Because Maya is based on an open architecture, all your work can be scripted... Read more
Evernote 6.0.1 - Create searchable notes...
Evernote allows you to easily capture information in any environment using whatever device or platform you find most convenient, and makes this information accessible and searchable at anytime, from... Read more
calibre 2.11 - Complete e-library manage...
Calibre is a complete e-book library manager. Organize your collection, convert your books to multiple formats, and sync with all of your devices. Let Calibre be your multi-tasking digital... Read more
Herald 5.0.1 - Notification plugin for M...
Note: Versions 2.1.3 (for OS X 10.7), 3.0.6 (for OS X 10.8), and 4.0.8 (for OS X 10.9) are no longer supported by the developer. Herald is a notification plugin for Mail.app, Apple's Mac OS X email... Read more
Firetask 3.7 - Innovative task managemen...
Firetask uniquely combines the advantages of classical priority-and-due-date-based task management with GTD. Stay focused and on top of your commitments - Firetask's "Today" view shows all relevant... Read more
TechTool Pro 7.0.6 - Hard drive and syst...
TechTool Pro is now 7, and this is the most advanced version of the acclaimed Macintosh troubleshooting utility created in its 20-year history. Micromat has redeveloped TechTool Pro 7 to be fully 64... Read more
PhotoDesk 3.0.1 - Instagram client for p...
PhotoDesk lets you view, like, comment, and download Instagram pictures/videos! (NO Uploads! / Image Posting! Instagram forbids that! AND you *need* an *existing* Instagram account). But you can do... Read more
SuperDuper! 2.7.3 - Advanced disk clonin...
SuperDuper! is an advanced, yet easy to use disk copying program. It can, of course, make a straight copy, or "clone" -- useful when you want to move all your data from one machine to another, or do... Read more
MacJournal 6.1.5 - Create, maintain, and...
MacJournal is the world's most popular journaling software for the Mac. MacJournal 6 adds a calendar mode that show entries from any journal, geolocation, word count, and progress tracking, as well... Read more

Latest Forum Discussions

See All

Quest for Revenge (Games)
Quest for Revenge 1.0.0 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0.0 (iTunes) Description: The great Kingdom of the west has fallen. The gods ignore the prayers of the desperate. A dark warlord has extinguished... | Read more »
Threadz is a New Writing Adventure for Y...
Threadz is a New Writing Adventure for You and Your Friends Posted by Jessica Fisher on November 21st, 2014 [ permalink ] In the tradition of round-robin storytelling, | Read more »
SteelSeries Stratus XL Hardware Review
Made by: SteelSeries Price: $59.99 Hardware/iOS Integration Rating: 4 out of 5 stars Usability Rating: 4.5 out of 5 stars Reuse Value Rating: 4.25 out of 5 stars Build Quality Rating: 4.5 out of 5 stars Overall Rating: 4.31 out of 5 stars | Read more »
ACDSee (Photography)
ACDSee 1.0.0 Device: iOS iPhone Category: Photography Price: $1.99, Version: 1.0.0 (iTunes) Description: Capture, perfect, and share your photos with ACDSee. The ACDSee iPhone app combines an innovative camera, a powerful photo... | Read more »
ProTube for YouTube (Entertainment)
ProTube for YouTube 2.0.2 Device: iOS Universal Category: Entertainment Price: $1.99, Version: 2.0.2 (iTunes) Description: ProTube is the ultimate, fully featured YouTube app. With it's highly polished design, ProTube offers ad-free... | Read more »
Weather or Not - Reports and Forecasts...
Weather or Not - Reports and Forecasts for your Calendar 1.0.0 Device: iOS iPhone Category: Weather Price: $2.99, Version: 1.0.0 (iTunes) Description: Weather or Not is a beautiful and intuitive way to check the weather and... | Read more »
Sago Mini Road Trip (Education)
Sago Mini Road Trip 1.0 Device: iOS Universal Category: Education Price: $2.99, Version: 1.0 (iTunes) Description: Go for a fun-filled drive with Jinja the cat. Pick a destination, select a vehicle and hit the road. What will Jinja... | Read more »
New Tower Defense Game, Kingdom Rush: Or...
New Tower Defense Game, Kingdom Rush: Origins, is Available Today Posted by Jessica Fisher on November 20th, 2014 [ permalink ] iPad Only App - Designed for the iPad | Read more »
Sunburn! (Games)
Sunburn! 1.0.0 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0.0 (iTunes) Description: Your ship is gone. Your crew is scattered. One option remains. Gather your crew... and jump into the sun. Reunite your... | Read more »
Tapventures Review
Tapventures Review By Jennifer Allen on November 20th, 2014 Our Rating: :: ODDLY COMPELLINGUniversal App - Designed for iPhone and iPad Tapventures is an increasingly hands-off one-tap RPG, but expect it to hook you despite your... | Read more »

Price Scanner via MacPrices.net

64GB iPod touch on sale for $249, save $50
Best Buy has the 64GB iPod touch on sale for $249 on their online store for a limited time. Their price is $50 off MSRP. Choose free shipping or free local store pickup (if available). Sale price for... Read more
15″ 2.2GHz Retina MacBook Pro on sale for $17...
 B&H Photo has the 2014 15″ 2.2GHz Retina MacBook Pro on sale for $1799.99 for a limited time. Shipping is free, and B&H charges NY sales tax only. B&H will also include free copies of... Read more
New Logitech AnyAngle Case/Stand Brings Flexi...
Logitec has announced the newest addition to its suite of tablet products — the Logitech AnyAngle. A protective case with an any-angle stand for iPad Air 2 and all iPad mini models, AnyAngle is the... Read more
2013 15-inch 2.0GHz Retina MacBook Pro availa...
B&H Photo has leftover previous-generation 15″ 2.0GHz Retina MacBook Pros available for $1499 including free shipping plus NY sales tax only. Their price is $500 off original MSRP. B&H will... Read more
16GB Retina iPad mini on sale today for $199,...
 Staples has 2nd generation 16GB Retina iPad minis on sale for $199 on their online store for a limited time. Their price is $100 off MSRP. Choose free shipping or free local store pickup (if... Read more
Developers Start Designing Apps for Apple Wat...
Apple has announced the availability of WatchKit, software that gives developers a set of tools to easily create experiences designed specifically for Apple Watch. Apple’s developer community can now... Read more
C Spire Launches iPad Air 2 and iPad Mini 3 o...
C Spire has announced that iPad Air 2 with Wi-Fi + Cellular and iPad mini 3 with Wi-Fi + Cellular are now available on its 4G LTE network. C Spire offers both new iPads with a range of data plans... Read more
Are You On Your Last PC? – The ‘Book Mystique
Will your current PC be your last? Quite possibly so if you define “personal computer” as a traditional desktop or laptop form factor machine according to some commentators. So then, the upshot that... Read more
Save up to $180 on MacBook Airs with Apple re...
The Apple Store has Apple Certified Refurbished 2014 MacBook Airs available for up to $180 off the cost of new models. An Apple one-year warranty is included with each MacBook, and shipping is free.... Read more
16GB iPad mini available for $219, save $30
Walmart has 16GB iPad minis (1st generation) available for $219 on their online store. Their price is $30 off MSRP. Choose free shipping or free store pickup (if available). Price for online orders... Read more

Jobs Board

*Apple* Solutions Consultant (ASC)- Retail S...
**Job Summary** The ASC is an Apple employee who serves as an Apple brand ambassador and influencer in a Reseller's store. The ASC's role is to grow Apple Read more
Project Manager, *Apple* Financial Services...
**Job Summary** Apple Financial Services (AFS) offers consumers, businesses and educational institutions ways to finance Apple purchases. We work with national and Read more
*Apple* Store Leader Program - College Gradu...
Job Description: Job Summary As an Apple Store Leader Program agent, you can continue your education as you major in the art of leadership at the Apple Store. You'll Read more
*Apple* Retail - Multiple Positions (US) - A...
Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, you're also the Read more
Senior Event Manager, *Apple* Retail Market...
…This senior level position is responsible for leading and imagining the Apple Retail Team's global event strategy. Delivering an overarching brand story; in-store, Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.