Hibernate - Criteria Queries

Question

在我目前的项目中，我遇到了使用hibernate条件查询获取实体的问题。 我有Employees和Tasks实体。

任务实体：

@Entity
@Table(name="task")
public class Tasks implements Serializable {

private static final long serialVersionUID = -7988799579036225137L;

@ManyToOne
@JoinColumn(name="employee_id")
private Employees employees;

public Employees getEmployees() {
    return employees;
}

****relevant getters & setters******

员工实体：

@Entity
@Table(name="employee")
public class Employees implements Serializable {

private static final long serialVersionUID = -7988799579036225137L;

@Id
@Column(name="employee_id")
private String empId;

****relevant getters & setters******

我正在尝试从表单中设置empId并显示相关员工的相关任务。 我必须将此限制赋予标准API。 我目前的代码如下。 我想知道我该怎么做。 请给我一个帮助。 提前致谢。

ViewAssignedTasksDaoImpl.java

@Repository
@Transactional
public class ViewAssignedTasksDaoImpl implements ViewAssignedTasksDao {

@Autowired
private HibernateUtilImpl hibernateutilimpl;

@Resource(name = "sessionFactory")
protected SessionFactory sessionFactory;


public List<Tasks> viewassignedTasks(Tasks tasks) {


    Session session = sessionFactory.openSession();

    Employees employees = tasks.getEmployees();

    Criteria cr = session.createCriteria(Tasks.class);
    cr.add(Restrictions.eq("empId", tasks.employees.getEmpId()));
    List<Tasks> tasksList = cr.list();

 return tasksList;

}

Answer 1

希望这个能对您有所帮助 ..

ArrayList<Tasks> TasksListByEmpId = (ArrayList<Tasks>) this
                        .getSession()
                        .createCriteria(Tasks.class,"task")
                        .setProjection(Projections.projectionList()
      .add(Projections.property("task.yourproprty_name"), "yourproprty_name")
       .add(Projections.property("task.yourproprty_name"), "yourproprty_name")
        .add(Projections.property("task.yourproprty_name"), "yourproprty_name")
      .add(Projections.property("task.yourproprty_name"), "yourproprty_name"))
                        .add("empId", tasks.employees.getEmpId()))
                        .add(Restrictions.in("task.taskStatus", statusList))
                        .setResultTransformer(Transformers.aliasToBean(Tasks.class))
                        .list();