DisplayTagAndHibernatePagination |
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Your trail: |
Display Tag and Hibernate Pagination - How to achieve pagination in display tag library using hibernate in 3 easy steps.
1) Add partialList="true" size="resultSize" to the display tag in your jsp file like so:
<display:table name="collection" cellspacing="0" cellpadding="0" requestURI=""
defaultsort="1" id="c" pagesize="25" partialList="true" size="resultSize" class="list" export="false">
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2) Modify your action file by adding a method which gets the page number from the request
public final class DisplayTagAction extends BaseAction {
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
if (log.isDebugEnabled()) {
log.debug("Entering 'execute' method");
}
TestDataManager amgr = (TestDataManager) getBean("testDataManager");
//get the page number from request
int page = getPage(request);
int size = 25;
//pass in page and size
request.setAttribute("collection", amgr.getTestData(page, size);
//get the total size of collection , required for display tag to get the pagination to work
request.setAttribute("resultSize", new Integer(amgr.getTestDataSize()));
return mapping.findForward("displayTagPage");
}
public int getPage(HttpServletRequest request){
int page=0;
Enumeration paramNames = request.getParameterNames();
while (paramNames.hasMoreElements()) {
String name = (String)paramNames.nextElement();
if (name != null && name.startsWith("d-") && name.endsWith("-p")) {
String pageValue = request.getParameter(name);
if (pageValue != null) {
page = Integer.parseInt(pageValue)-1;
}
}
}
return page;
}
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3) Modify the data access call to return a paginated list.
public List getTestData(int page, int pageSize){
Query query = getSession().createQuery("from Test");
return query.setFirstResult(page * pageSize).setMaxResults(pageSize+1).list();
}
public int getTestDataSize() {
return ((Integer)getSession().createQuery("select count(*) from Test").uniqueResult()).intValue();
}
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voila!
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