在数据表中使用 PrimeFaces 延迟加载

Question

I take Data from Database with Hibernate .and I show data in datatable in my program now I have to show data with lazy loading Primefaces Datatable

I don't know how should I change my Code. I search internet, I don't find anyway. (I want List testList with lazy loading in Datatable showing)

XHTML file:

<p:dataTable var="test" value="#{testMB.testList}" id="testTable"width="100%" liveResize="true">

ManagedBean file

private List<TestDTO> testList = new ArrayList<TestDTO>();
public List<TestDTO> getTestList() {
    return logList;
}
public void setTestList(final List<TestDTO> pTestList) {
    testist = pTestList;
}

TestDTO class

public class TestDTO implements Serializable {

    private static final long serialVersionUID = XXXXXXXXXXXXXXL;

    private String XXXXXXXX;
    private Date XXXXXXXX;
    private String XXXXXXXX;
    private Long XXXXXXXX;
    private Long XXXXXXXX;
    private Long XXXXXXXX;
    private String XXXXXXXX;
    private String XXXXXXXX;
    ........

Answer 1

You have to implement LazyDataModel class for lazy loading instead of using normal ArrayList and you should set lazy to true at your datatable.

<p:dataTable var="test" value="#{testMB.testList}" id="testTable"width="100%" liveResize="true" lazy="true">

You might consider turn on paginator as well as it serves the purpose of lazy loading.

More Info:http://www.primefaces.org/showcase/ui/data/datatable/lazy.xhtml

Sample of a LazyDataModel class.

class LazyTestDataModel extends LazyDataModel<TestDTO> implements Serializable {
    private static final long serialVersionUID = 1L;

    @Override
    public List<TestDTO> load(int first, int pageSize, String sortField, SortOrder sortOrder,
            Map<String, Object> filters) {
        try {

            Map<String, Object> params = PrimefacesBeanUtils.populatePaginationMap(first, pageSize, sortField, sortOrder, filters);

            setRowCount(testService.getListCount(params));

            if (getRowCount() > 0) {
                return testService.getList(params);
            }

        } catch (Throwable t) {
            errorResult(t);
        }

        return null;
    }
}