Three-layer development with PHP5_PHP tutorial

Original text: http://www.onlamp.com/pub/a/php(as the current mainstream development language)/2004/12/09/three_tier.html
Three- Tier Development with php(as the current mainstream development language) 5
by Luis Yordano Cruz
12/09/2004

This article demonstrates php( As the current mainstream development language) The powerful functions of three-tier development, PEAR::DB_DataObject is used for business logic, and Smarty is used for display logic. It is assumed here that you are familiar with

HTML, Smarty, PEAR ::DB_DataObject, MySQL (the best combination with PHP) and php (as the current mainstream development language) 5. If you need to supplement your knowledge, the following article explains Some principles:

Use PHP (as the current mainstream development language) DataObject to simplify business logic
Introduction to Smarty: a PHP (as the current mainstream development language) Template engine
php(as the current mainstream development language)Scalability: Myth

You should have installed and configured apache(Unix platform The most popular WEB server platform) , MySQL (the best combination with PHP) , and php (as the current mainstream development language) 5 (or iis(Microsoft's WEB server platform), MySQL(the best combination with PHP)5 and php(as the current mainstream development language))

PEAR::DB_DataObject
PEAR::DB_DataObject is an abstract API for user database access. It is a SQL builder and data modeling layer based on PEAR::DB. It

The database table is mapped to the php(as the current mainstream development language) class and provides public SQL functions like SELECT, INSERT, UPDATE, and DELETE. This makes it impossible to solve SQL without

Developers can also write good database access code, and are encouraged to have a clear separation of presentation logic and business logic.

(DB_OO has been moved to PEAR, and is now DB_DataObject, if you have old code To update, check out the notes on upgrading from old db_oo code to

DB_DataObjects).

Related reading Language)
5
By Adam Trachtenberg Table of Contents
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Code Fragments only
DataObject performs two tasks. First, it builds SQL statements based on the objects variables and the builder

methods. Second, it acts as a datastore for a table row. Theres a core class, which you extend for each of

your tables so that you put the data logic inside the data classes. Theres also an included Generator to make

your configuration files and your base classes.

DataObject performs two tasks. First, it constructs SQL statements and builder methods based on object variables. Second, it serves as a data store for database tables

Storage. There is a core class here, which is inherited for each table, allowing you to put the data logic into the data class. There is also a generator included here,

DataObject huge Simplifying database access code, it makes developing large, data-driven sites easier.

At present, Alan Knowles, the lead developer of PEAR::DB_DataObject, is working on a new project called DBDO,

a C implementation of the PEAR package DB_DataObjects, based on libgda. His goal is to create the next

generation of PEAR::DB_DataObjects.

SMARTY

Smarty is a php

(as the current mainstream development language)

template engine that separates content from web page presentations. It uses GPL license.

Large projects commonly separate the role of the graphic designer from that of the programmer. However,

programming in php

(as the current mainstream development language)

has the tendency to combine those two roles in a person and inside the code. This can bring

difficulties when it comes time to change some part of the pages design. If the page mixes content and

presentation, the developer has to crawl through the program to find the presentation. Smarty helps to solve

this problem.

Combining the Two

The first thing to do when starting this project is to create a workspace in which to store the projects code.

Then its time to configure PEAR::DB_DataObject to connect to the MySQL
(The best combination with PHP)

database MySQL

(The best combination with PHP) ( name: example), map the database tables to php(as the current mainstream development language)

classes, and then configure Smarty for the presentation tier for the user. Here

are those steps in more detail:

Create a working environment

Create a directory called dataobjects.

From the command line To install PEAR::DB_DataObject, type:

>pear install Date

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