Developer Notes - ITwelzel.biz

}
+ e.getMessage());
}
return dao;
public ContactsDAO getContactsDAO()
{
return (ContactsDAO)lookupDAO(ConfigFile.CONTACTS_DAO_CLASS);
}
public PersonDAO getPersonDAO()
{
return (PersonDAO)lookupDAO(ConfigFile.PERSON_DAO_CLASS);
}
public AddressDAO getAddressDAO()
{
return (AddressDAO)lookupDAO(ConfigFile.ADDRESS_DAO_CLASS);
}
}
public CompanyDAO getCompanyDAO()
{
return (CompanyDAO)lookupDAO(ConfigFile.COMPANY_DAO_CLASS);
}
The DAO Client
A client application or service retrieves the desired DAO factory, which is used to
retrieve the desired DAO instance. Once the DAO instance is retrieved, the client
can call data access methods on the instance without worrying about the
underlying data access code:
// retrieve the desired DAO Factory
DAOFactory hsqldbFactory =
DAOFactory.getDAOFactory(DAOFactory.HSQLDB);
Developer Notes
// retrieve the DAO
ContactsDAO ContactsDAO = hsqldbFactory.getContactsDAO();
// create a new Contact
String contactID = contactsDAO.addContact(addStr);
// get the new Contact object.
Contact contact = contactsDAO.getContact(contactID);
// modify the Contact object using SQL statements
contactsDAO.modifyContact(contactID, modifyStr);
// delete the Contact object
contactsDAO.deleteContact(aContact);
N o v e m b e r 2 0 0 2
55