Simple java question...

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gbattine - 21 Aug 2006 14:10 GMT

Hi guys,
please help me with this simple java question.
I'm developing a jsf application but i have a java question.
Suppose i have an authentication bean with 3 attributes,login,password
and team that load the values inserted in a login page.
In another bean i have a method that performs inserting an experiment
into a db.
My prepared statement is like...

pst2.setString(1, name);
pst2.setString(2, team);
pst2.setString(3, platform);
etc...

but i want name is the login attribute and team the team attribute of
authenticationBean.
How can i pass these values to my pst.2setString?

Please help me

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M.J. Dance - 21 Aug 2006 14:30 GMT

> Hi guys,
> please help me with this simple java question.
[quoted text clipped - 13 lines]
> authenticationBean.
> How can i pass these values to my pst.2setString?

Your "authentication bean with 3 attributes", say it's named auth, probably has
the means of aquireing such data. Either a public field or, more likely, a
getter of some sort. Like that: auth.name or auth.getName(). Stick that into
pst2.setString().

BTW: this is really basic stuff. You should do some RTFM on the subject (Java as
well as JSF).

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Moiristo - 21 Aug 2006 15:44 GMT

>> Hi guys,
>> please help me with this simple java question.
[quoted text clipped - 21 lines]
> BTW: this is really basic stuff. You should do some RTFM on the subject
> (Java as well as JSF).

I think he means that he wants to know how to use a backing bean in
another class. Although it's true that some RTFM would not be a bad
thing (:D). On topic, I use a static function to evaluate registered
javabeans (not my own idea). Create a class ViewUtils.java with this method:

public static Object eval(String expr) {
FacesContext context = FacesContext.getCurrentInstance();
ValueBinding binding
= context.getApplication().createValueBinding(expr);
return binding.getValue(context);
}

noy you can retrieve a managed bean in any class by calling:
Object bean = ViewUtils.eval("#{managed_bean_name}");

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gbattine - 21 Aug 2006 16:00 GMT

thanks guys,
but my problem isn't resolved!
I've created this class

package giu;

import javax.faces.context.FacesContext;
import javax.faces.el.ValueBinding;

public class ViewUtils {
    public static Object eval(String expr) {
FacesContext context = FacesContext.getCurrentInstance();
ValueBinding binding
= context.getApplication().createValueBinding(expr);
return binding.getValue(context);
}
}

and in my experiment class i have the add method that is like(i post
the important code)

if (conn != null) {
                Object bean = ViewUtils.eval("#{authenticationBean}");
                PreparedStatement pst2 = null;
                pst2 = conn.prepareStatement("INSERT INTO
esperimento(username,nometeam,piattaforma,links_url,tipoesperimento,controlliqualita)
VALUES (?,?,?,?,?,?)");
                pst2.setString(1, bean.loginName);
                pst2.setString(2, bean.teamName);
                pst2.setString(3, platform);

...................................etc
where authenticationBean is the bean from which i want extracting
loginName and teamName fields..
my compiler says loginName and teamName can't be resolved...please help
me!!!

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Moiristo - 21 Aug 2006 16:45 GMT

> package giu;
>
[quoted text clipped - 28 lines]
> my compiler says loginName and teamName can't be resolved...please help
> me!!!

Now this is *really* basic stuff. How much experience do you have in
basic java programming? Anyway, you have to cast bean to the appropriate
class.

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gbattine - 21 Aug 2006 19:48 GMT

thanks,
but can you help me with code?
thanks

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Moiristo - 21 Aug 2006 23:46 GMT

> thanks,
> but can you help me with code?
> thanks

Just like: AuthenticationBean bean = (AuthenticationBean)
ViewUtils.eval("#{authenticationBean}");

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