CODEWITHSUNDEEP
jsfdatatable
user2061913
user2061913

Reputation: 920

How to get data from the controller model to the view

hi guys sorry to post again but this is really confusing me

i have a query that i can get to run, the user enters a string and then the application will search for this in the database connected to the application, this bit i have working, however now i have successfully run the queury i am unsure of how to retrieve the data from it and be able to use it in the view in a h:datatable

currently to do the search, this is what is in the view, the faclet page the user enters

<h:inputText id="search" value="#{userdetailsController.search}" />   
                    &nbsp;
                    <p:commandButton value="Search" action="#{userdetailsController.submit}" ajax="true" />

this then goes to

@Named("userdetailsController")
@SessionScoped
public class UserdetailsController implements Serializable {

    @EJB

 private String search;

    private List<Userdetails> item; // No need for DataModel here.

    public String submit() {
        item = ejbFacade.searchByString(search);
        return ""; //change this !, testing only
    }

    public String getSearch() {
        return search;
    }

    public void setSearch(String search) {
        this.search = search;
    }

then 

public abstract class AbstractFacade<T> {

    private Class<T> entityClass;
    private List userList;

/* trying out a search function */
    public List<T> searchByString(String string) {
        System.out.println("in SearchByString");
        return getEntityManager().createNamedQuery("Userdetails.findByUsername").setParameter("username", "%" + string + "%").getResultList();
    }

which does the search in

@Entity
@Table(name = "USERDETAILS")
@XmlRootElement
@NamedQueries({
    @NamedQuery(name = "Userdetails.findAll", query = "SELECT u FROM Userdetails u"),
    @NamedQuery(name = "Userdetails.findById", query = "SELECT u FROM Userdetails u WHERE u.id = :id"),
    @NamedQuery(name = "Userdetails.findByUsername", query = "SELECT u FROM Userdetails u WHERE u.username = :username")})

How can i once this process has been completed retrieve the data to print out in the console for example, what do i need to call to do this ?

Upvotes: 1

Views: 357

Answers (1)

BalusC
BalusC

Reputation: 1108632

i am unsure of how to retrieve the data from it

Your code already does that in the submit() method.

and be able to use it in the view in a h:datatable

Just add the following to your view, maybe below the command button in the same form, in order to present it:

<h:dataTable value="#{userdetailsController.item}" var="userdetails">
    <h:column>#{userdetails.username}</h:column>
</h:dataTable>

And make sure that this is covered in the ajax update of the command button:

<p:commandButton ... update="@form" />

Unrelated to the concrete problem, I'd only rename the confusing property name item to items as it represents a collection of items, not a single item. Also, your submit() method doesn't need to return an empty string. It can also just be declared void. Also, ajax="true" is the default already for <p:commandButton>, you can just omit it.

Upvotes: 3

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