官术网_书友最值得收藏!

Chapter 2. ORM and Data Collections

Collections and models are the bread and butter of everyday Magento development. In this chapter, we will introduce the reader to the Magento ORM system, and we will learn how to work with data collections and the EAV system properly. As most modern systems, Magento implements an object-relational mapping (ORM) system.

Object-relational mapping (ORM, O/RM, and O/R mapping) in computer software is a programming technique for converting data between incompatible type systems in object-oriented programming languages. This creates, in effect, a "virtual object database" that can be used from within the programming language.

In this chapter, we will cover the following topics:

  • Magento Models
  • Anatomy of a Magento Data Model
  • EAV and EAV models
  • Working with Direct SQL queries

We will also be working with several snippets of code to provide an easy framework to experiment and play around with Magento.

Note

The interactive examples in this chapter assume you are working either with the default Magento installation inside the VagrantBox or a Magento installation with sample data.

For this purpose, I have created the Magento IMC (Interactive Magento Console), which is a shell script specially created for this book and inspired by Ruby's IRB (Interactive Ruby Console). To get started, follow these steps:

  1. The first thing we will need to do is install the IMC to download the source files from https://github.com/amacgregor/mdg_imc and extract them under your Magento test installation. The IMC is a simple Magento shell script that will allow to test our code in real time.
  2. Once you extract the script, log into the shell of your VirtualBox.
  3. Next, we will need to navigate to our Magento root folder. If you are using the default vagrant box and installation provided, the root folder is located under /srv/www/ce1720/public_html. We navigate to it by running this command:
    $ cd /srv/www/ce1720/public_html
    
  4. Finally, we can start the IMC by running the following command:
    $ php shell/imc.php
    
  5. If everything is installed successfully, we will see a new line starting with magento >.
主站蜘蛛池模板: 浑源县| 抚松县| 枣阳市| 清原| 沙坪坝区| 大足县| 潜山县| 兴隆县| 康定县| 林西县| 肇源县| 唐河县| 深泽县| 邛崃市| 六枝特区| 黄陵县| 深泽县| 金塔县| 怀安县| 库车县| 伽师县| 湘阴县| 韩城市| 钟祥市| 凌源市| 西城区| 宁波市| 肃北| 茂名市| 额济纳旗| 子洲县| 竹山县| 定南县| 揭阳市| 大姚县| 大田县| 大英县| 蓬安县| 江达县| 湾仔区| 合水县|