TweetFollow Us on Twitter

OpenBase

Volume Number: 14 (1998)
Issue Number: 4
Column Tag: Rhapsody

OpenBase

by Gene Backlin

A Solid Database Framework for Rhapsody

Introduction

OpenBase is a solid database framework which will address your data handling requirements for Rhapsody. Like Rhapsody, OpenBase's foundation is with NeXTSTEP. It has evolved through the years to provide a mature environment for stand alone users as well as over distributed networks. For the developer, OpenBase has a rich set of application APIs that incorporate the C and Objective-C languages. Regardless of developers programming background Mac OS or NeXTSTEP/OpenStep, the OpenBase API framework allows quick development of full scale database applications.

Overview

This article will illustrate:

  • Steps to build SimpleTool, an application that queries a "Movie" database, show just how simple is writing an OpenBase database application.
  • Help Desk, an application using OpenBaseAdvancedAPI to address multi-tiered database interaction over local area networks.
  • OpenBase Manager, OpenBase's data management and interactive tool.

SimpleTool

SimpleTool demonstrates interaction with a relational database interaction without using the tedious programming overhead common with databases. Using C or Objective-C is the simplest way to access OpenBase. SimpleTool will retrieve from the database the movies and the revenue from the producing studios. Listing 1 illustrates the OpenBase API framework. A discussion follows.

Listing 1: SimpleTool_main.m

#import <Foundation/Foundation.h>
#import <OpenBaseAPI/OpenBase.h>

int main (int argc, const char *argv[])
{
  NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
  int returnCode;
  OpenBase *connection = ob_newConnection();

  //variables to hold values
  char movieTitle[256];
  char studioName[256];
  long revenue;

  if (!ob_connectToDatabase
    (connection, "Movie", "*", "", "", &returnCode))
    {
    printf("%s\n", ob_connectErrorMessage(connection));
    return -1;
    }

  ob_makeCommand(connection,"select t0.TITLE, t0.REVENUE, 
    t1.NAME from MOVIE t0, STUDIO t1 where 
    t0.STUDIO_ID = t1.STUDIO_ID order by t0.REVENUE DESC");

  if (!ob_executeCommand(connection))
    {
    printf("ERROR - %s\n",ob_serverMessage(connection));
    ob_invalidate(connection);
    return -1;
    }

  ob_bindString(connection, movieTitle);
  ob_bindLong(connection, &revenue);
  ob_bindString(connection, studioName);

  while (ob_nextRow(connection)) 
    {
    printf("%s made $%ld for %s.\n",movieTitle, revenue, 
      studioName);
    }

  ob_invalidate(connection);
  [pool release];
  exit(0);
  return 0;
}

Main begins by establishing a connection to the database, if a connection was not made, print the offending message returned from the connection object and exit. Using the ob_connectToDatabase() function, establish a connection to the database with the database name, hostname, logon id and password. Note the argument "*". The database connection is made directly to the local machine on a standalone computer, but will poll all hosts on a local area network. This is an example of OpenBase's scaleability.

  int returnCode;
  OpenBase *connection = ob_newConnection();
  // ...
  if (!ob_connectToDatabase(connection, "Movie", "*", "", "", 
    &returnCode))
    {
    printf("%s\n", ob_connectErrorMessage(connection));
    return -1;
    }

After a successful connection has been established, the ob_makeCommand() function is used to send SQL statements. The TITLE and REVENUE data columns from the MOVIE table as well as the associated studio NAME from the STUDIO table are retrieved. The SQL statements are now buffered for later execution by the database server.

  ob_makeCommand(connection,"select t0.TITLE, t0.REVENUE,
  t1.NAME from MOVIE t0, STUDIO t1 where t0.STUDIO_ID =
  t1.STUDIO_ID order by t0.REVENUE DESC");

The ob_executeCommand() passes the buffered SQL statements to the database server and returns TRUE for successful and FALSE for failed execution.

  if (!ob_executeCommand(connection))
    {
    printf("ERROR - %s\n",ob_serverMessage(connection));
    ob_invalidate(connection);
    return -1;
    }

The ob_bindString() and ob_bindLong() functions, bind the resulting data columns from the database, to the receiving program variables. SimpleTool binds the variables movieTitle, revenue and studioName respective to the order of the initial SELECT statement.

  ob_bindString(connection, movieTitle);
  ob_bindLong(connection, &revenue);
  ob_bindString(connection, studioName);

ob_nextRow() increments through the result rows and retrieves the data. FALSE is returned when all data is processed.

  while (ob_nextRow(connection)) 
    {
    printf("%s made $%ld for %s.\n",movieTitle, revenue, 
      studioName);
    }

Main ends with a call to terminate the connection to the database server.

  ob_invalidate(connection);

Help Desk

Help Desk, addresses multi-tiered database requirements by directly connecting to the user interface through the OpenBaseAdvancedAPI as seen in Figure 1.

Figure 1. Help Desk Manager.

Designing the Interface

The Apple supplied tool Interface Builder is used to design the user interface. Information on Interface Builder is detailed at http://devworld.apple.com/techinfo/techdocs/rhapsody/apple.com. See Figure 2 for a screen shot of a connection being performed using Interface Builder.

Figure 2. Making the Interface Builder Object Connection.

Managing the Interface and Database Relationships

Two FormManagers and one ReadTableManager are created. The first FormManager lists customer questions and the other displays who asked the question. The ReadTableManager manages a picklist of information.

  tableManager = [[ReadTableManager alloc] init];
  formManager = [[FormManager alloc] init];
  contactsFormManager = [[FormManager alloc] init];

To set the key attribute and table, each object must be initialized.

  [tableManager setKeyAttribute:@"support._rowid"];
  [tableManager setTableName:@"support"];

  [formManager setKeyAttribute:@"support._rowid"];
  [formManager setTableName:@"support"];

  [contactsFormManager setKeyAttribute:@"contacts._rowid"];
  [contactsFormManager setTableName:@"contacts"];

Connect the interface objects; tableManager, formManager and contactsFormManager to the database.

  [tableManager setConnection:connection];
  [formManager setConnection:connection];
  [contactsFormManager setConnection:connection];

Set specific query ordering. In this example "ASC" is ascending.

  [tableManager setOrderBy:@" ORDER BY
    support.shortQuestion ASC"];

Bind the screen objects to the database columns.

#define FIELD(outlet) [OutletManager newForOutlet:outlet]
#define TEXT(outlet) [OutletTextManager newForOutlet:outlet]
#define POPUP(outlet) [OutletPopUpManager   \
                      newForOutlet:outlet]

[formManager addOutlet:FIELD(shortQuestion) 
      withColumnName:@"support.shortQuestion"];
[formManager addOutlet:FIELD(product) 
      withColumnName:@"support.product"];
[formManager addOutlet:TEXT(textQuestion) 
      withColumnName:@"support.question"];
[formManager addOutlet:TEXT(textAnswer) 
      withColumnName:@"support.answer"];
[formManager addOutlet:FIELD(dateCreated) 
      withColumnName:@"support.dateCreated"];
[formManager addOutlet:POPUP(answered) 
      withColumnName:@"support.answered"];

Set up the Contacts Form to be a target of the FormManager.

[contactsFormManager addOutlet:FIELD(firstname) 
      withColumnName:@"contacts.firstname"];
[contactsFormManager addOutlet:FIELD(lastname) 
      withColumnName:@"contacts.lastname"];
[contactsFormManager addOutlet:FIELD(email) 
      withColumnName:@"contacts.email"];

Add each column to initialize the table.

[tableManager addColumn:@"support.product" 
    title:@"Product"];
[tableManager addColumn:@"support.answered" 
    title:@"Answered"];
[tableManager addColumn:@"support.shortQuestion" 
    title:@"Summary"];

Initialize the windowTableView object, to display the query results.

[tableManager setTableView:windowTableView];

Establishing Database Relationships

The formManager will display related details when a selection is made in the tableManager. To accomplish this, a target relationship must be made between the tableManager and formManager.

[tableManager addTarget:formManager
    withValue:@"support._rowid"];

The contactsFormManager displays the contacts through the contacts_id key.

[formManager addOutlet:contactsFormManager
    withColumnName:@"support.contacts_id"];

The formManager sets the SQL "WHERE" constraints as well as subqueries.

[tableManager fetchData:[formManager whereConstraints]];

Insulation from Direct SQL

OpenBase's OpenBaseAdvancedAPI, completely insulates you from SQL commands like SEARCH, RESET, SAVE and DELETE, by the following methods.

- (void)findAction:sender
{
  [tableManager fetchData:[formManager whereConstraints]];
}

- (void)resetAction:sender
{
  [tableManager resetAction:self];
}

- (void)saveAction:sender
{
  [formManager saveChanges];
}

- (void)deleteAction:sender
{
  [tableManager deleteAction:self];
}

The OpenBase Manager

In addition to the developer API frameworks, OpenBase like Rhapsody, designed graphical tools to simplify tasks. OpenBase Manager simplifies the following:

  • Managing Database servers across local area networks
  • Viewing Databases
  • Editing Database schemas
  • Managing Database security

OpenBase Interactive Database Toolset

The following screen shots display OpenBase's rich set of tools.

Figure 3. OpenBase Database Manager.

Figure 4. User Administration.

Figure 5. Permission Administration.

Figure 6. Database Table Administration.

User Comments

Sirius Connections, a leading provider of internet services for the San Francisco area, uses OpenBase for billing and maintaining historical records on 15,000 customers. "Our whole operation is built on OpenBase technology, " says Andreas Glocker, CEO of Sirius Connections, "Automating our business on OpenBase has made all the difference. It has given us the competitive advantage."

"One of our programmers wrote a system using the OpenBase API in less than a day. Doing the same thing using Oracle OCI's took more than three," says Kevin Ford, President of ComputerActive located in Ontario Canada, "OpenBase demonstrates a level of quality and robustness rarely seen in the software world."

Robert L. Peek, founder of the Peek Financial Group, says, "We have adopted OpenBase as an enterprise wide solution for our firm. We have found it to be an industrial strength database with excellent support."

Contact Information

OpenBase supports ODBC for Mac OS and Windows and has a native JDBC driver. For further information about OpenBase and how you can get a FREE single-user runtime, you can contact:

OpenBase International, Ltd
58 Greenfield Road
Francestown, NH 03043
Tel: 603-547-8404 -- Fax: 603-547-2423
e-mail: info@openbase.com
internet: http://www.openbase.com


Gene Backlin, gbacklin@MariZack.com, has been programming since 1978, and is owner and principal consultant of MariZack Consulting, formed in 1991 with one purpose -- to help. He has been helping clients such as IBM, McDonnell Douglas, Waste Management Inc., the U.S. Environmental Protection Agency, AT&T, Ameritech, Discover Card, Rockwell International, Bank of America and Nations Bank. He also helps local universities in the area of education and is author of the book "Developing NeXTSTEP Applications" ISBN 0-672-30658-1 published by SAM's Publishing.

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

Civilization VI 1.3.0 - Next iteration o...
Civilization® VI is the award-winning experience. Expand your empire across the map, advance your culture, and compete against history’s greatest leaders to build a civilization that will stand the... Read more
Corel Painter 20.1.0.285 - Digital art s...
Corel Painter lets you advance your digital art style with painted textures, subtle glazing brushwork, interactive gradients, and realistic Natural-Media. Easily transition from traditional to... Read more
iTubeDownloader 6.5.19 - Easily download...
iTubeDownloader is a powerful-yet-simple YouTube downloader for the masses. Because it contains a proprietary browser, you can browse YouTube like you normally would. When you see something you want... Read more
OmniFocus 3.8 - GTD task manager with iO...
OmniFocus is an organizer app. It uses projects to organize tasks naturally, and then add tags to organize across projects. Easily enter tasks when you’re on the go, and process them when you have... Read more
Hazel 4.4.5 - Create rules for organizin...
Hazel is your personal housekeeper, organizing and cleaning folders based on rules you define. Hazel can also manage your trash and uninstall your applications. Organize your files using a familiar... Read more
Macs Fan Control 1.5.7 - Monitor and con...
Macs Fan Control allows you to monitor and control almost any aspect of your computer's fans, with support for controlling fan speed, temperature sensors pane, menu-bar icon, and autostart with... Read more
Acorn 6.6 - Bitmap image editor.
Acorn is a new image editor built with one goal in mind - simplicity. Fast, easy, and fluid, Acorn provides the options you'll need without any overhead. Acorn feels right, and won't drain your bank... Read more
OnyX 3.8.2 - Maintenance and optimizatio...
OnyX is a multifunction utility that you can use to verify the startup disk and the structure of its system files, to run miscellaneous maintenance and cleaning tasks, to configure parameters in the... Read more
macOS Catalina 10.15.5 - An Operating Sy...
macOS Catalina gives you more of everything you love about Mac. Experience three all-new media apps: Apple Music, Apple TV, and Apple Podcasts. Locate a missing Mac with the new Find My app. And now... Read more
macOS High Sierra Security Updates 10.13...
macOS High Sierra introduces new core technologies that improve the most important functions of your Mac. From rearchitecting how it stores your data to improving the efficiency of video streaming to... Read more

Latest Forum Discussions

See All

Steam Link Spotlight - Signs of the Sojo...
Steam Link Spotlight is a feature where we look at PC games that play exceptionally well using the Steam Link app. Our last entry was XCOM: Chimera Squad. Read about how it plays using Steam Link's new mouse and keyboard support over here. | Read more »
Steampunk Tower 2, DreamGate's sequ...
Steampunk Tower 2 is a DreamGate's follow up to their previous tower defence game. It's available now for both iOS and Android as a free-to-play title and will see players defending their lone base by kitting it out with a variety of turrets. [... | Read more »
Clash Royale: The Road to Legendary Aren...
Supercell recently celebrated its 10th anniversary and their best title, Clash Royale, is as good as it's ever been. Even for lapsed players, returning to the game is as easy as can be. If you want to join us in picking the game back up, we've put... | Read more »
Pokemon Go Fest 2020 will be a virtual e...
Niantic has announced that Pokemon Go Fest will still take place this year although understandably it won't be a physical event. Instead, it will become a virtual celebration and is set to be held on 25th and 26th July. [Read more] | Read more »
Marvel Future Fight's major May upd...
Marvel Future Fight's latest update has now landed, and it sounds like a big one. The focus this time around is on Marvel's Guardians of the Galaxy, and it introduces all-new characters, quests, and uniforms for players to collect. [Read more] | Read more »
SINoALICE, Yoko Taro and Pokelabo's...
Yoko Taro and developer Pokelabo's SINoALICE has now opened for pre-registration over on the App Store. It's already amassed 1.5 million Android pre-registrations, and it's currently slated to launch on July 1st. [Read more] | Read more »
Masketeers: Idle Has Fallen's lates...
Masketeers: Idle Has Fallen is the latest endeavour from Appxplore, the folks behind Crab War, Thor: War of Tapnarok and Light A Way. It's an idle RPG that's currently available for Android in Early Access and will head to iOS at a later date. [... | Read more »
Evil Hunter Tycoon celebrates 2 million...
Evil Hunter Tycoon has proved to be quite the hit since launching back in March, with its most recent milestone being 2 million downloads. To celebrate the achievement, developer Super Planet has released a new updated called Darkness' Front Yard... | Read more »
Peak's Edge is an intriguing roguel...
Peak's Edge is an upcoming roguelike puzzle game from developer Kenny Sun that's heading for both iOS and Android on June 4th as a free-to-play title. It will see players rolling a pyramid shape through a variety of different levels. [Read more] | Read more »
Clash Royale: The Road to Legendary Aren...
Supercell recently celebrated its 10th anniversary and their best title, Clash Royale, is as good as it's ever been. Even for lapsed players, returning to the game is as easy as can be. If you want to join us in picking the game back up, we've put... | Read more »

Price Scanner via MacPrices.net

New 16″ MacBook Pros now on sale for up to $2...
Apple reseller DataVision is now offering new 16″ Apple MacBook Pros for up to $255 off MSRP, each including free shipping. Prices start at $2194. DataVision charges sales tax for NY, NJ, PA, and CA... Read more
Apple now offering Certified Refurbished iPho...
Apple is now offering Certified Refurbished iPhone Xr models in the refurbished section of their online store starting at $499. Each iPhone comes with Apple’s standard one-year warranty, ships free,... Read more
Sale! Get a 10.2″ 32GB WiFi iPad for only $27...
Walmart has new 10.2″ 32GB WiFi iPads on sale for $50 off Apple’s MSRP, only $279. These are the same iPads sold by Apple in their retail and online stores. Be sure to select Walmart as the seller... Read more
Apple resellers offer new 2020 Mac minis for...
Apple resellers are offering new 2020 Mac minis for up to $50 off Apple’s MSRP with prices available starting at $759. Shipping is free: (1) B&H Photo: – 2020 4-Core Mac mini: $759 $40 off MSRP... Read more
Sprint is offering the Apple iPhone 11 free t...
Did you miss out on Sprint’s recent free iPhone SE promotion? No worries. Sprint has the 64GB iPhone 11 available for $0 per month for new lines when you trade-in a qualifying phone in any condition... Read more
Apple has clearance 2019 13″ 1.4GHz MacBook P...
Apple has Certified Refurbished 2019 13″ 1.4GHz 4-Core Touch Bar MacBook Pros available today starting at $979 and up to $440 off original MSRP. Apple’s one-year warranty is included, shipping is... Read more
Apple restocks 2019 MacBook Airs starting at...
Apple has clearance, Certified Refurbished, 2019 13″ MacBook Airs available again starting at $779. Each MacBook features a new outer case, comes with a standard Apple one-year warranty, and is... Read more
Apple restocks clearance Mac minis for only $...
Apple has restocked Certified Refurbished 2018 4-Core Mac minis for only $599. Each mini comes with a new outer case plus a standard Apple one-year warranty. Shipping is free: – 3.6GHz Quad-Core... Read more
Apple’s new 2020 13″ MacBook Airs on sale for...
B&H Photo has Apple’s new 2020 13″ 4-Core and 6-Core MacBook Airs on sale today for $50-$100 off Apple’s MSRP, starting at $949. Expedited shipping is free to many addresses in the US. The... Read more
B&H continues to offer clearance 2019 13″...
B&H Photo has clearance 2019 13″ 4-Core MacBook Pros available for up to $300 off Apple’s original MSRP, with prices starting at $1149. Expedited shipping is free to many addresses in the US. B... Read more

Jobs Board

Security Officer - *Apple* Store - NANA (Un...
**Security Officer \- Apple Store** **Description** About NMS Built on a culture of safety and integrity, NMSdelivers award\-winning, integrated support services to Read more
Transition Into Practice Program (TIP) - Sept...
…Academy-Transition into Practice (TIP) Residency program at St Mary Medical Center in Apple Valley, CA. **We are seekingRegistered Nurses who are:** + New graduate Read more
Essbase Developer - *Apple* - Theorem, LLC...
Job Summary Apple is seeking an experienced, detail-minded Essbase developer to join our worldwide business development and strategy team. If you are someone who Read more
Senior Software Engineer @ *Apple* - Theore...
Job Summary Apple is looking for a seasoned senior software engineer to join our worldwide business development and strategy team. This is an opportunity to lead a Read more
Cub Foods - *Apple* Valley - Now Hiring Par...
Cub Foods - Apple Valley - Now Hiring Part Time! United States of America, Minnesota, Apple Valley Retail Operations Post Date May 18, 2020 Requisition # 119230 Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.