How to realize the login function in adf

i am a fresh man,knows little about adf.
I know how to pass the user's input to managed bean,as below：
<af:dialog id="d2" affirmativeTextAndAccessKey="login"
cancelTextAndAccessKey="cancel"
dialogListener="#{login.handleLogin}" type="okCancel">
<af:inputText label="Label 1" id="it1"
value="#{login.user}"/>
<af:inputText label="Label 2" id="it2"
value="#{login.password}"/>
</af:dialog>
but how can i get the user informantion like username,password from database in the following method of the bean class:
public void handleLogin(DialogEvent dialogEvent)
if(dialogEvent.getOutcome() == DialogEvent.Outcome.ok)
//here i should get user information from database, but how?
before, i can build the connection object and statement object myself. In adf, I don't know where to begin.

Hi..
To create application with inbuilt authentication you can use jazn-data.xml, Here you can define user roles and users etc.
See:
try [http://www.oracle.com/webapps/online-help/jdeveloper/10.1.3/state/content/navId.4/navSetId._/vtAnchor.BGBGJEAH/vtTopicFile.adfdevguide|adding_security~htm/]
JDev 11g ADF Security app on standalone WLS against Active Directory
http://kr.forums.oracle.com/forums/thread.jspa?threadID=603703

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