Answer / naveen kumar v

DAO: Data Access Object. here the main concept of DAO is to
communicate with the database. DAO mainly contains
1.) DAOFactory: this specifies which kind of database
(wether MySQL or ORACLE or MSSQL etc...).

2.) SQLFactory: which extends the DAOFactory. Here we do
all the connection stuffs.deciding te driver, hostname,
URL, username, password etc and also getting the Connection
object.

3.) AdminDAO: this is a interface where we declare all the
methods which we need in our application to perform all the
database related operation.

4.) SQLAdminFactory: this implements the AdminDAO
interface, all its method. this also gets the connection
from SQLFactory.

5.) TransactionControlDAO: here we keep the commit and
roolback methods.

if required...
6) ConnectionConstant: in this file we can mention the file
name (.properties file) where we keep the connection
detals, like hostname, username, password, etc...

Answer / ankit

DAO(Data Access logic) provide the machanism to saperate our bussiness logic from data access logic and both code can be change independently that lead to flexibility in our application. and it also provide security because when will see spurce code from web page only the business logic can be seen and cant see the data access logic . and it also provide reusability

what is filter ?

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