Delphi 7 - Tutorial - Creating a CLX Database Application.pdf - Delphi 7 - musli_com

Tutorial: Creating a CLX

Database Application

Borland ®

Delphi ™ 7

for Windows ™

Borland Software Corporation

100 Enterprise Way, Scotts Valley, CA 95066-3249

www.borland.com

are trademarks or registered trademarks of Borland Software Corporation in the United States and other countries.

All other marks are the property of their respective owners.

D7-DB-0802

Contents

Creating a CLX database application

Overview of database architecture . . . . . . . . . 1

Creating a new project. . . . . . . . . . . . . . . . 2

Setting up data access components . . . . . . . . 3

Setting up the database connection. . . . . . . 3

Setting up the unidirectional dataset . . . . . . 5

Setting up the provider, client dataset,

and data source . . . . . . . . . . . . . . . . . 5

Designing the user interface . . . . . . . . . . . . 6

Creating the grid and navigation bar . . . . . 6

Adding support for a menu . . . . . . . . . . . 8

Adding a menu . . . . . . . . . . . . . . . . . . 10

Adding a button . . . . . . . . . . . . . . . . . 11

Displaying a title and an image . . . . . . . . . . 12

Writing an event handler. . . . . . . . . . . . . . 13

Writing the Update Now! command

event handler. . . . . . . . . . . . . . . . . . 13

Writing the Exit command event handler . . 14

Writing the FormClose event handler. . . . . 15

Index

iii

Creating a CLX database application

Chapter1

This tutorial guides you through the creation of a cross-platform application that lets

you view and update a sample employee database. Cross-platform applications use

CLX, the Borland Component Library for Cross-Platform. Designed to compile and

run on different platforms, CLX applications require a minimum of changes between

Windows and Linux ports.

This tutorial assumes you are familiar with Windows and have read the introduction

to Delphi programming and the IDE in the Quick Start .

This tutorial requires the Professional or Enterprise editions of Delphi, which include

database components. You must also have InterBase installed to successfully

complete this tutorial.

Note

Overview of database architecture

The architecture of a database application may seem complicated at first, but the use

of multiple components simplifies the development and maintenance of actual

database applications.

Database applications include three main parts: the user interface, a set of data access

components, and the database itself. In this tutorial, you will create a dbExpress

database application. Other database applications have a similar architecture.

The user interface includes data-aware controls such as a grid so that users can edit

and post data to the database. The data access components include the data source,

the client dataset, the data provider, a unidirectional dataset, and a connection

component. The data source acts as a conduit between the user interface and a client

dataset. The client dataset is the heart of the application because it contains a set of

records from the underlying database which are buffered in memory. The provider

transfers the data between the client dataset and the unidirectional dataset, which

Creating a CLX database application

Delphi 7 - Tutorial - Creating a CLX Database Application.pdf

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