[英]Primefaces DataTable + JPA / Hibernate Pagination
如果我能以某種方式將這兩個框架結合在一起,那將會非常酷。
單擊Primefaces Datatable上的next或prev按鈕將觸發查詢,使用JPA限制查詢結果。
也許有一些機制,primefaces組件也可以從另一個JPA選擇計數查詢中獲取總頁數?
有沒有關於如何將這些付諸實踐的例子?
請分享您的經驗。
謝謝 !
您可以使用LazyDataModel。 在這個示例中,我使用Netbeans創建的BackBean和JpaController“從實體創建JSF CRUD頁面”(BackBean必須是@SessionScoped)
private LazyDataModel<Car> lazyModel;
private int pageSize = 5;
public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}
public int getPageSize() {
return pageSize;
public void LoadData() {
lazyModel = new LazyDataModel<Car>() {
@Override
public List<Car> load(int first, int pageSize, String sortField, boolean sortOrder, Map<String, String> filters) {
//Sorting and Filtering information are not used for demo purposes just random dummy data is returned
List<Car> result = new ArrayList<Car>();
try {
result = getJpaController().findCarEntities(pageSize, first);
} catch (Exception ex) {
JsfUtil.addErrorMessage(ex, search);
}
return result;
}
};
/**
* In a real application, this number should be resolved by a projection query
*/
lazyModel.setRowCount(getJpaController().getCarCount());
lazyModel.setPageSize(pageSize);
}
public LazyDataModel<Car> getLazyModel() {
return lazyModel;
}
我已經添加
lazyModel.setPageSize(pageSize);
由0知道問題http://code.google.com/p/primefaces/issues/detail?id=1544
<p:dataTable var="item" value="#{controller.lazyModel}"
rows="#{controller.pageSize}" paginator="true"
paginatorTemplate="{CurrentPageReport} {FirstPageLink} {PreviousPageLink} {PageLinks} {NextPageLink} {LastPageLink} {RowsPerPageDropdown}"
rowsPerPageTemplate="9,12,15"
page=""
lazy="true"
dynamic="true"
id="pnlResult"
>
這是我的代碼,包含一列(名稱列)的過濾器。
// @PostConstruct method(injection for ejb's happens after constructor)
contactsEJB.getEntityManager().getEntityManagerFactory().getCache().evictAll(); //Clear the cache(get fresh data)
lazyModel = new LazyDataModel<Contacts>() {
@Override
public List<Contacts> load(int first, int pageSize, String sortField, boolean sortOrder, Map<String, String> filter) {
List<Contacts> list = new ArrayList<Contacts>();
if (!filter.isEmpty()) {
Iterator it = filter.entrySet().iterator();
it.hasNext(); //this needs to be a while loop to handle multiple filter columns
Map.Entry pairs = (Map.Entry) it.next();
list = contactsEJB.findNameLike(pairs.getValue().toString(), first, pageSize);
getLazyModel().setRowCount(list.size());
} else {
list = contactsEJB.findRangeOrder(first, pageSize);
getLazyModel().setRowCount(contactsEJB.count());
}
return list;
}
};
getLazyModel().setRowCount(contactsEJB.count());
EJB
public List<Contacts> findRangeOrder(int start, int max) {
CriteriaQuery cq = getEntityManager().getCriteriaBuilder().createQuery();
CriteriaBuilder builder = getEntityManager().getCriteriaBuilder();
Root<Contacts> root = cq.from(Contacts.class);
cq.select(root);
cq.orderBy(builder.desc(root.get(Contacts_.inserted)));
Query query = getEntityManager().createQuery(cq);
query.setMaxResults(max);
query.setFirstResult(start);
return query.getResultList();
}
public List<Contacts> findNameLike(String name, int start, int max) {
CriteriaQuery cq = getEntityManager().getCriteriaBuilder().createQuery();
CriteriaBuilder builder = getEntityManager().getCriteriaBuilder();
Root<Contacts> root = cq.from(Contacts.class);
cq.select(root);
Predicate likeName = builder.like(root.get(Contacts_.name), "%"+name+"%");
cq.where(likeName);
Query query = getEntityManager().createQuery(cq);
query.setMaxResults(max);
query.setFirstResult(start);
return query.getResultList();
}
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