Raible's Wiki: CreateDAO

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This class should extend [BaseObject|http://raibledesigns.com/downloads/appfuse/api/org/appfuse/model/BaseObject.java.html], which has 3 abstract methods: equals(), hashCode() and toString(). You will need to implement these methods in the Person class. The easiest way to do this is using [Commonclipse|http://commonclipse.sf.net]. More information on using this tool can be found on [Lee Grey's site|http://www.leegrey.com/hmm/2004/09/29/1096491256000.html].

This class should extend [BaseObject|http://raibledesigns.com/downloads/appfuse/api/org/appfuse/model/BaseObject.java.html], which has 3 abstract methods: (equals(), hashCode() and toString()) that you will need to implement in the Person class. The first two are required by Hibernate. The easiest way to do this is using [Commonclipse|http://commonclipse.sf.net]. More information on using this tool can be found on [Lee Grey's site|http://www.leegrey.com/hmm/2004/09/29/1096491256000.html].

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;:%%(color: blue)''I usually open an existing object (i.e. User.java or Resume.java) and save it as a new file. Then I delete all the methods and properties. This gives me the basic JavaDoc header. I'm sure I could edit Eclipse templates to do this, but since I develop on 3 different machines, this is just easier.''%%

In the code snippet above, we're extending [BaseObject|http://raibledesigns.com/downloads/appfuse/api/org/appfuse/model/BaseObject.java.html] because it has the following useful methods: toString(), equals(), hashCode() - the latter two

are required by Hibernate.

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To start, create a PersonDaoTest.java class in the test/dao/**/dao directory. This class should extend [BaseDaoTestCase|http://raibledesigns.com/downloads/appfuse/api/org/appfuse/dao/BaseDaoTestCase.java.html], which already exists in this package. This parent class is used to load [Spring's|http://www.springframework.org] ApplicationContext (since Spring binds the layers together), and for automatically loading a .properties file (ResourceBundle) that has the same name as your *Test.class. In this example, if you put a PersonDaoTest.properties file in the same directory as PersonDaoTest.java, this file's properties will be available via an "rb" variable.

To start, create a PersonDaoTest.java class in the test/dao/**/dao directory. This class should extend [BaseDaoTestCase|http://raibledesigns.com/downloads/appfuse/api/org/appfuse/dao/BaseDaoTestCase.java.html], which already exists in this package. This parent class is used to load [Spring's|http://www.springframework.org] ApplicationContext (since Spring binds the layers together), and for (optionally) loading a .properties file (ResourceBundle) that has the same name as your *Test.class. In this example, if you put a PersonDaoTest.properties file in the same directory as PersonDaoTest.java, this file's properties will be available via an "rb" variable.

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import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

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//~ Instance fields ========================================================

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//~ Methods ================================================================

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log = LogFactory.getLog(PersonDaoTest.class);

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public static void main(String[] args) {

junit.textui.TestRunner.run(PersonDaoTest.class);

}

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assertTrue(person.getLastName().equals("Last Name Updated"));

assertEquals(person.getLastName(), "Last Name Updated");

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assertNull(dao.getPerson(person.getId()));

try {

person = dao.getPerson(person.getId());

fail("Person found in database");

} catch (DataAccessException dae) {

log.debug("Expected exception: " + dae.getMessage());

assertNotNull(dae);

}

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;:''I tend to just hard-code test values into Java code - but the .properties file is an option.''

;:''I tend to just hard-code test values into Java code - but the .properties file is an option that works great for large objects.''

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import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

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private Log log = LogFactory.getLog(PersonDaoHibernate.class);

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return (Person) getHibernateTemplate().get(Person.class, id);

Person person = (Person) getHibernateTemplate().get(Person.class, id);

if (person == null) {

throw new ObjectRetrievalFailureException(Person.class, id);

}

return person;

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Object person = getHibernateTemplate().load(Person.class, id);

getHibernateTemplate().delete(person);

// object must be loaded before it can be deleted

getHibernateTemplate().delete(getPerson(id));

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.excludeZeroes() //exclude zero valued properties

.ignoreCase(); //perform case insensitive string comparisons

.excludeZeroes() // exclude zero valued properties

.ignoreCase(); // perform case insensitive string comparisons

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throw new DAOException(e);

throw new DataAccessException(e.getMessage());

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''Next Up:'' __Part II:__ [Creating new Managers|CreateManager] - A HowTo for creating [Business Delegates|http://java.sun.com/blueprints/corej2eepatterns/Patterns/BusinessDelegate.html] that talk to the database tier (DAOs) and the web tier (Struts Actions).

''Next Up:'' __Part II:__ [Creating new Managers|CreateManager] - A HowTo for creating Business Facades, which are similar to [Session Facades|http://java.sun.com/blueprints/patterns/SessionFacade.html], but don't use EJBs. These facades are used to provide communication from the front-end to the DAO layer.

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