CreateDAO

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About this Tutorial

• A Data Access Object (a.k.a. a DAO), an Interface and a Hibernate Implementation
• A JUnit class to test our DAO is working

AppFuse uses Hibernate for it's persistence layer. Hibernate is an Object/Relational (O/R) Framework that allows you to relate your Java Objects to database tables. It allows you to very easily perform CRUD (Create, Retrieve, Update, Delete) on your objects. Let's get started on creating a new Object, DAO and Test in AppFuse's architecture.

Table of Contents

• [1] Create a new Object and add XDoclet tags
• [2] Create a new database table from the object using Ant
• [3] Create a new DaoTest to run JUnit tests on your DAO
• [3] Create a new DAO to perform CRUD on the object
• [4] Notify Hibernate that this object exists in ServiceLocator (for tests) and in hibernate.cfg.xml (for webapp)
• [5] Run the DaoTest

Create a new Object and add XDoclet tags [#1]

package org.appfuse.persistence;

public class Person extends BaseObject {
	private Long id;
	private String firstName;
	private String lastName;
	
	/* 
	Generate your getters and setters using
	your favorite IDE:
	    Eclipse: Right-click -> Source - > 
	             Generate Getters and Setters   
	    IDEA:    ?? I can't seem to figure it out right now
}

In the code snippet above, we're extending BaseObject because it has the following useful methods: toString(), equals(), hashCode() - the latter two are required by Hibernate.

Now that we have this POJO created, we need to add XDoclet tags to generate the Hibernate mapping file. This mapping file is used by Hibernate to map objects -> tables and properties (variables) -> columns.

Create a new database table from the object using Ant [#2]

Create a new DaoTest to run JUnit tests on your DAO [#3]

Create a new DAO to perform CRUD on the object [#4]

Notify Hibernate that this object exists [#5]

Run the DaoTest [#6]