Primefaces datatable lazy pagination работает, но я был очень разочарован после поиска полного примера использования Criteria в сети. Так что я смешал решения из
- http://stackoverflow.com/questions/13972193/how-to-query-data-for-primefaces-datatable-with-lazy-loading-and-pagination
- http://www.primefaces.org/showcase/ui/datatableLazy.jsf
- http://www.javacodegeeks.com/2012/04/lazy-jsf-primefaces-datatable.html
Чтобы собрать все вместе в полный пример, используйте:
- Primefaces 4.0
- TomEE 1.6.0+
- Критерии JPA
С участием:
- фильтрация
- Сортировка
- пагинация
- Использование @ViewScoped Managed Beans
Итак, начнем:
фрагмент HTML
|
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
|
<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><h:body> <h:form id="am"> <p:dataTable var="element" value="#{inventoryManagerMB.model}" lazy="true" paginator="true" rows="10" paginatorTemplate="{RowsPerPageDropdown} {FirstPageLink} {PreviousPageLink} {CurrentPageReport} {NextPageLink} {LastPageLink}" rowsPerPageTemplate="10,50,100" id="sites"> <p:column sortBy="id" filterBy="id" filterMatchMode="contains" headerText="ID"> <h:outputText value="#{element.id}" /> </p:column> <p:column sortBy="name" filterBy="name" filterMatchMode="contains" headerText="Name"> <h:outputText value="#{element.name}" /> </p:column> <p:column sortBy="siteType.name" filterBy="siteType.name" filterMatchMode="contains" headerText="Type"> <h:outputText value="#{element.siteType.name}" /> </p:column> <p:column sortBy="ip" filterBy="ip" filterMatchMode="contains" headerText="IP"> <h:outputText value="#{element.ip} " /> </p:column> <p:column sortBy="description" filterBy="description" filterMatchMode="contains" headerText="Description"> <h:outputText value="#{element.description}" /> </p:column> </p:dataTable> </h:form></h:body></html> |
ManagedBean
|
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
|
@ManagedBean@ViewScopedpublic class InventoryManagerMB implements Serializable { private static final long serialVersionUID = -1201944101993687165L; @EJB private InventoryManagerEJB inventoryManagerEJB; private LazyDataModel<Site> model; @PostConstruct public void init() { try { this.model = new LazyDataModel<Site>(){ private static final long serialVersionUID = 1L; @Override public List<Site> load(int first, int pageSize, String sortField, SortOrder sortOrder, Map<String, String> filters) { List<Site> result = inventoryManagerEJB.getResultList(first, pageSize, sortField, sortOrder, filters); model.setRowCount(inventoryManagerEJB.count(sortField, sortOrder, filters)); return result; } };} public LazyDataModel<Site> getModel() { return model; } public void setModel(LazyDataModel<Site> model) { this.model = model; } (...) |
EJB
|
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
|
@Statelesspublic class InventoryManagerEJB { @Inject private BaseService baseService; public List<Site> getResultList(int first, int pageSize, String sortField, SortOrder sortOrder, Map<String, String> filters) { List<Site> all = new ArrayList<Site>(); all.addAll(this.baseService.getSiteDAO().getAll(first,pageSize,sortField,sortOrder,filters)); return all; } public int count(String sortField, SortOrder sortOrder, Map<String, String> filters) { return this.baseService.getSiteDAO().getAll(-1,-1,null,null,filters).size(); }} |
BaseService
|
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
|
@ApplicationScopedpublic class BaseService implements Serializable{ private static Logger log = Logger.getLogger(BaseService.class); /* * persistence */ private static final long serialVersionUID = 588696475267901772L; @PersistenceContext private EntityManager entityManager; private SiteDAO siteDAO; @PostConstruct public void init() { siteDAO = new SiteDAO(entityManager); } public SiteDAO getSiteDAO() { return siteDAO; } |
SiteDAO
|
001
002
003
004
005
006
007
008
009
010
011
012
013
014
015
016
017
018
019
020
021
022
023
024
025
026
027
028
029
030
031
032
033
034
035
036
037
038
039
040
041
042
043
044
045
046
047
048
049
050
051
052
053
054
055
056
057
058
059
060
061
062
063
064
065
066
067
068
069
070
071
072
073
074
075
076
077
078
079
080
081
082
083
084
085
086
087
088
089
090
091
092
093
094
095
096
097
098
099
100
101
102
103
104
105
106
107
108
109
|
public class SiteDAO extends GenericDAO<Site>{ public SiteDAO(EntityManager entityManager) { super(entityManager); } public Collection<Site> getAll(int first, int pageSize, String sortField, SortOrder sortOrder, Map<String, String> filters) { CriteriaBuilder cb = entityManager.getCriteriaBuilder(); CriteriaQuery<Site> q = cb.createQuery(Site.class); Root<Site> site = q.from(Site.class); Join<Site,SiteType> siteType = site.join(Site_.siteType); q.select(site); Path<?> path = getPath(sortField, site, siteType); if (sortOrder == null){ //just don't sort }else if (sortOrder.equals(SortOrder.ASCENDING)){ q.orderBy(cb.asc(path)); }else if (sortOrder.equals(SortOrder.DESCENDING)){ q.orderBy(cb.asc(path)); }else if (sortOrder.equals(SortOrder.UNSORTED)){ //just don't sort }else{ //just don't sort } //filter Predicate filterCondition = cb.conjunction(); for (Map.Entry<String, String> filter : filters.entrySet()) { if (!filter.getValue().equals("")) { //try as string using like Path<String> pathFilter = getStringPath(filter.getKey(), site, siteType); if (pathFilter != null){ filterCondition = cb.and(filterCondition, cb.like(pathFilter, "%"+filter.getValue()+"%")); }else{ //try as non-string using equal Path<?> pathFilterNonString = getPath(filter.getKey(), site, siteType); filterCondition = cb.and(filterCondition, cb.equal(pathFilterNonString, filter.getValue())); } } } q.where(filterCondition); //pagination TypedQuery<Site> tq = entityManager.createQuery(q); if (pageSize >= 0){ tq.setMaxResults(pageSize); } if (first >= 0){ tq.setFirstResult(first); } return tq.getResultList(); } private Path<?> getPath(String field, Root<Site> site, Join<Site, SiteType> siteType) { //sort Path<?> path = null; if (field == null){ path = site.get(Site_.name); }else{ switch(field){ case "id": path = site.get(Site_.id); break; case "name": path = site.get(Site_.name); break; case "siteType.name": path = siteType.get(SiteType_.name); break; case "ip": path = site.get(Site_.ip); break; case "description": path = site.get(Site_.description); break; } } return path; } private Path<String> getStringPath(String field, Root<Site> site, Join<Site, SiteType> siteType) { //sort Path<String> path = null; if (field == null){ path = site.get(Site_.name); }else{ switch(field){ case "id": path = null; break; case "name": path = site.get(Site_.name); break; case "siteType.name": path = siteType.get(SiteType_.name); break; case "ip": path = site.get(Site_.ip); break; case "description": path = site.get(Site_.description); break; } } return path; }} |
сущность
|
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
|
@Entity@Table(uniqueConstraints=@UniqueConstraint(columnNames={"name"}))public class Site implements Serializable { /** * */ private static final long serialVersionUID = 8008732613898597654L; @Id @GeneratedValue(strategy = GenerationType.AUTO) private Long id; @Nameable @Column(nullable=false) private String name; private String ip; private String description; @ManyToOne @JoinColumn(name="siteTypeId") private SiteType siteType;(...)} |
Вот и все. Наслаждаться.
Ссылка: Primefaces DataTable Lazy Загрузка с разбивкой по страницам, фильтрацией и сортировкой с использованием JPA Criteria, @ViewScoped от нашего партнера JCG Леонардо Шикида в блоге Leo’s Notepad .