用数据填充primefaces数据表

Question

i am using the primefaces(I use PF 3.5) datatable and I want to fill the table with data from my db.

<p:dataTable id="cars" var="car" value="#{productservice.getListOrderedByDate()}"
    editable="true" editMode="cell" widgetVar="productTable">

my service method looks like that:

public List<Product> getListOrderedByDate() {
    log.trace("Returning list of Products...");
    log.info(productDAO.getProductsOrderedByDate());
    return productDAO.getProductsOrderedByDate();
}

However, when I render the table in my xhtml page I get No records found. back.

I really appreciate your answer!!!

UPDATE

   <p:dataTable var="product" value="#{productservice.getListOrderedByDate}"> 

                            <f:facet name="header"> Product  </f:facet>

                            <p:column headerText="id" style="width:15%">
                                <h:outputText value="#{product.id}" />
                            </p:column>

                            <p:column headerText="Object Type" style="width:15%">
                                <h:outputText value="#{product.objectType}" />
                            </p:column>

                            <p:column headerText="Price" style="width:15%">
                                <h:outputText value="#" />
                            </p:column>

                            <p:column headerText="For" style="width:15%">
                                <h:outputText value="#{product.for}" />
                            </p:column>

UPDATE 2

my method product ordered by date:

public List<Product> getProductsOrderedByDate() {
  CriteriaBuilder cb = em.getCriteriaBuilder();
  CriteriaQuery<Product> criteria = cb.createQuery(Product.class);
  Root<Product> product = criteria.from(Product.class);

  criteria.select(product).orderBy(cb.desc(product.get("creationDate")));
  return em.createQuery(criteria).getResultList();
}

Answer 1

I guess the problem is that you set value in a wrong way.

value="#{yourBean.listOfCars}"

value is expected to be a iterable type of list.

See the showcase: http://www.primefaces.org/showcase/ui/datatableBasic.jsf;jsessionid=1c0z4mgiaz5531cqf4v78m79iy

Answer 2

You can use @Juvanis solution, or in your chosen you need to use:

 <p:dataTable var="product" value="#{productservice.getListOrderedByDate()}">

Instead of:

 <p:dataTable var="product" value="#{productservice.getListOrderedByDate}">

Answer 3

Are you sure the value attribute is correct?

In my opinion it should be

 value="#{productservice.listOrderedByDate}

and not

value="#{productservice.getListOrderedByDate}"