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
$111.10
Apple Inc.
+1.69
MSFT
$46.59
Microsoft Corpora
+0.85
GOOG
$511.22
Google Inc.
+6.33

MacTech Search:
Community Search:

Software Updates via MacUpdate

BBEdit 11.0.2 - Powerful text and HTML e...
BBEdit is the leading professional HTML and text editor for the Mac. Specifically crafted in response to the needs of Web authors and software developers, this award-winning product provides a... Read more
ExpanDrive 4.2.1 - Access cloud storage...
ExpanDrive builds cloud storage in every application, acts just like a USB drive plugged into your Mac. With ExpanDrive, you can securely access any remote file server directly from the Finder or... Read more
Adobe After Effects CC 2014 13.2 - Creat...
After Effects CC 2014 is available as part of Adobe Creative Cloud for as little as $19.99/month (or $9.99/month if you're a previous After Effects customer). After Effects CS6 is still available... Read more
Command-C 1.1.7 - Clipboard sharing tool...
Command-C is a revolutionary app which makes easy to share your clipboard between iOS and OS X using your local WiFi network, even if the app is not currently opened. Copy anything (text, pictures,... Read more
Tidy Up 4.0.2 - Find duplicate files and...
Tidy Up is a complete duplicate finder and disk-tidiness utility. With Tidy Up you can search for duplicate files and packages by the owner application, content, type, creator, extension, time... Read more
Typinator 6.3 - Speedy and reliable text...
Typinator turbo-charges your typing productivity. Type a little. Typinator does the rest. We've all faced projects that require repetitive typing tasks. With Typinator, you can store commonly used... Read more
GraphicConverter 9.5 - Graphics editor w...
GraphicConverter is an all-purpose image-editing program that can import 200 different graphic-based formats, edit the image, and export it to any of 80 available file formats. The high-end editing... Read more
Toast Titanium 12.0.1 - The ultimate med...
Toast Titanium goes way beyond the very basic burning in the Mac OS and iLife software, and sets the standard for burning CDs, DVDs, and now Blu-ray discs on the Mac. Create superior sounding audio... Read more
QuickBooks 2015 16.0.2.1422 R3 - Financi...
Save 20% on QuickBooks Pro for Mac today through this special discount link QuickBooks Pro 2013 helps you manage your business easily and efficiently. Organize your finances all in one place, track... Read more
Remotix 3.0.6 - Access all your computer...
Remotix is a fast and powerful application to easily access multiple Macs (and PCs) from your own Mac. Features: Complete Apple Screen Sharing support - including Mac OS X login, clipboard... Read more

Latest Forum Discussions

See All

The Snow is Falling on the French Countr...
The Snow is Falling on the French Countryside of Carcassonne’s Newest Update Posted by Jessica Fisher on December 18th, 2014 [ permalink ] < | Read more »
Creatures Such As We Review
Creatures Such As We Review By Jennifer Allen on December 18th, 2014 Our Rating: :: INTERESTING DISCUSSIONSUniversal App - Designed for iPhone and iPad Taking a more sedate approach to interactive fiction, Creatures Such As We... | Read more »
Give It Up! (Games)
Give It Up! 1.0 Device: iOS Universal Category: Games Price: $.99, Version: 1.0 (iTunes) Description: GIVE IT UP is a rather hard game where you have to assist this cheerful, singing Blob in jumping through 9 different tracks.So far... | Read more »
The Drive : Devil's Run (Games)
The Drive : Devil's Run 1.0 Device: iOS Universal Category: Games Price: $.99, Version: 1.0 (iTunes) Description: ON THE ROAD AGAIN! The Drive - Devil’s Run is classic point to point style racing game that pays homage to the classics... | Read more »
Procreate Pocket (Entertainment)
Procreate Pocket 1.01 Device: iOS iPhone Category: Entertainment Price: $2.99, Version: 1.01 (iTunes) Description: Create - anytime, anywhere. Made by the developers of the award-winning Procreate® for iPad®, Procreate Pocket™ allows... | Read more »
IRON FINGER - Mini Games Championship (...
IRON FINGER - Mini Games Championship 1.0 Device: iOS Universal Category: Games Price: $1.99, Version: 1.0 (iTunes) Description: Quick to play, easy to learn yet hard to master.. TAP, SWIPE & TILT your way through mini games that... | Read more »
Pentaction: Medieval (Games)
Pentaction: Medieval 1.0 Device: iOS Universal Category: Games Price: $1.99, Version: 1.0 (iTunes) Description: Pentaction: Medieval is a turn-based strategy board-game about chance and skill on the battlefield. Take control of your... | Read more »
Hipstify Review
Hipstify Review By Jennifer Allen on December 17th, 2014 Our Rating: :: COOL FILTERSUniversal App - Designed for iPhone and iPad Add filters, quotes, and fancy frames to your images, thanks to Hipstify.   | Read more »
Mighty Smighties Gets Evolve Cards and N...
Mighty Smighties Gets Evolve Cards and New Worlds Posted by Jessica Fisher on December 17th, 2014 [ permalink ] Universal App - Designed for iPhone and iPad | Read more »
Duckie Deck Card Wars Review
Duckie Deck Card Wars Review By Amy Solomon on December 17th, 2014 Our Rating: :: STYLISH GAME OF CARDSUniversal App - Designed for iPhone and iPad Duckie Deck Card Wars adapts the classic card game War for use on devices, complete... | Read more »

Price Scanner via MacPrices.net

KMI MIDI K-Board Great Gift for Amateur &...
The K-Board is a MIDI Nano keyboard for music creation for iPad, Android, And computers; the easiest way to make music with iPads & Android tablets, and Mac, Windows, or Linux computers. Ultra-... Read more
Amazon offers 15-inch 2.2GHz Retina MacBook P...
 Amazon.com has the 15″ 2.2GHz Retina MacBook Pro on sale for $1699 including free shipping. Their price is $300 off MSRP. Stock is limited, so act now if you’re interested. Read more
Holiday sales continue: MacBook Pros for up t...
 B&H Photo has new MacBook Pros on sale for up to $300 off MSRP as part of their Holiday pricing. Shipping is free, and B&H charges NY sales tax only: - 15″ 2.2GHz Retina MacBook Pro: $1699... Read more
Google Search App For iOS Gets A Major Makeov...
Google has given iOS users an early Christmas present with a substantial update of it’s not-very-often-upgraded Google Search app. Google Search has been my go-to tool for Web searches since it was... Read more
ShopKeep Apple Pay And Chip Card Reader Avail...
ShopKeep, a cloud-based technology provider to more than 10,000 small business owners to manage retail shops and restaurants with iPads, has released its new Apple Pay and chip card reader. This... Read more
Holiday sale! 27-inch 5K iMac for $2299, save...
 B&H Photo has the 27″ 3.5GHz 5K iMac in stock today and on sale for $2299 including free shipping plus NY sales tax only. Their price is $200 off MSRP, and it’s the lowest price available for... Read more
Holiday Sale! 3.7GHz Quad Core Mac Pro availa...
 B&H Photo has the 3.7GHz Quad Core Mac Pro on sale for $2599 including free shipping plus NY sales tax only. Their price is $400 off MSRP, and it’s the lowest price for this model from any... Read more
iPhone 6 Number 3 Canadian Google Search Of 2...
CTVNews.ca reports that Apple’s iPhone 6 was the third highest-trending Google Canada search topic of 2014, exceeded only by Robin Williams largely after his death by suicide in August, and the FIFA... Read more
New iPad mini 3 Counter-Top & Wall Mount...
newMacgadgets has announced new secure all-acrylic displays for the iPad mini 3 (also works fine with the mini 2, last year’s iPad mini With Retina Display, and the original iPad mini). The new iPad... Read more
Holiday sales continue, MacBook Airs for up t...
B&H Photo has 2014 MacBook Airs on sale for up to $120 off MSRP, for a limited time, for the Thanksgiving/Christmas Holiday shopping season. Shipping is free, and B&H charges NY sales tax... Read more

Jobs Board

*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
*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
*Apple* Retail - Multiple Positions (US) - A...
Job Description: Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, 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
Project Manager / Business Analyst, WW *Appl...
…a senior project manager / business analyst to work within our Worldwide Apple Fulfillment Operations and the Business Process Re-engineering team. This role will work Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.