defining resultSet paging from the webcontent side

[bobgee]

Hi there,

I read the seam docs, "Seam in Action", researched a lot, but didn't get the clue.
It's about defining the number of result records per page (EntityQuery.setMaxResults()) on the webcontent side, i. e. in the webcontent subproject (1 of the 4 project generated by the Seam wizard), not in the *List bean.
Preferred defined on a global basis in one place for all \*List.xhtml pages in my web project.

I cannot apply setMaxResults() in the constructor of my *List bean cause I need the whole resultset on another page (edit page) for filling a SelectOneMenu.

I read about the opportunity to define a query in components.xml like this:
<framework:entity-query scope="conversation" name="printerList" ejbql="select printer from Printer printer"
max-results="10"/>

This way of defining a query in xml has limitations. Problems/Questions:
- seems one cannot use xml definition if there are linked tables (e.g. @OneToMany), e. g.
ejbql="select printer from Printer printer join printer.manufacturer manufacturer". I get an error when accessing an entity member of the queried entity: value="#{printerList.manufacturer.name}" => "Property 'manufacturer' not found on type"
Dito with value="#{printerList.printer.manufacturer.name}"
?or I did something wrong?

Seems I only can define the query in a List bean and define members to getters for printer and manufacturer. Am I right?

- How would I pass the maxResults property to my List bean? In the first call of the *list.seam I have no URL parameter (only when advancing to the next page - if parameter defined in .page.xml), and sure it's not the right way to add a maxResult parameter to all list links in my menu.

- need a long running conversation to maintain the resultSet pointer (nextFirst etc.)??
scope="conversation" doesn't work, I stay on the first page.


- calculating current page number
I derive my individual entity List beans from my extened EntityQuery named ExtendedEntityQuery which adds a method getActivePage (this cannot be calculated in the view via an EL expression).

public int getActivePage() { 
  Integer fr = getFirstResult(); 
  Integer mr = getMaxResults();
  if (fr == null) {
    fr = 0;
  }
  if (mr != null) { 
    return (fr / mr) + 1; 
  }
  return 0; 
}

?How can I define another class for EntityQuery in the xml?
Or how do you show the current page number?

Thanks for your answers!

Greets, Robert