Question

此查询在控制台上正常运行，但现在我想在xhtml的{{1}}页面中显示它，我试过这个dataTable但是它无法正常工作

attemp

file.xhtml

List<Object[]> results; 
public List<Object[]> getResults() {
results = entityManager.createQuery("select d.lib_naturepanne,count(r) as nbrr"+" from NaturePanne d JOIN d.listReparation r  GROUP BY d.lib_naturepanne").getResultList();

for (Object[] result : results) {
String name = (String) result[0];
int count = ((Number) result[1]).intValue();
System.out.println("name "+name+ " count "+count);

    }
return results;

Answer 1

#{rep.results.name}错了。您有一个List<Object[]>，因此您可以得到如下结果：#{rep[0]}或者将您的Object []映射到某种POJO。

public class NameCount {
    String name;
    int count;
    public NameCount(Object[] o) {
        name = (String) o[0];
        count = (Integer) o[1];
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getCount() {
        return count;
    }
    public void setCount(int count) {
        this.count = count;
    }
}

 public List<NameCount> getResults() {
    List<Object[]> results = entityManager.createQuery(...);

    List<NameCount> rowset = new ArrayList<NameCount>();
    for (Object[] o : results) {
        rowset.add(new NameCount(o));
    }
    return rowset;
 }

在dataTable中显示查询（选择计数组）

1 个答案: