hql语法001

1、

import java.util.List;

import org.hibernate.*;
import org.junit.Test;

import cn.jbit.hibernatedemo.dao.HibernateUtil;
import cn.jbit.hibernatedemo.entity.Dept;
import cn.jbit.hibernatedemo.entity.Emp;

public class Eg {

    /**
     * 查询工资高于平均工资的员工。
     */
    @Test
    public void egEmp() {
        Session session = null;
        try {
            // 获取session
            session = HibernateUtil.currentSession();
            List<Emp> list = session.createQuery(
                    "from Emp e where e.salary>(select avg(salary) from Emp)")
                    .list();
            for (Emp emp : list) {
                System.out.println(emp.getEmpName() + "," + emp.getSalary());
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 关闭session
            HibernateUtil.closeSession();
        }
    }

    /**
     * 查询所有员工工资都小于5000的部门。
     */
    @Test
    public void eg5() {
        Session session = null;
        try {
            // 获取session
            session = HibernateUtil.currentSession();
            List<Dept> list = session
                    .createQuery(
                            "from Dept d where 5000>all(select e.salary from d.emps e) and d.emps.size>0")
                    .list();
            for (Dept dept : list) {
                System.out.println(dept.getDeptName());
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 关闭session
            if (session != null)
                session.close();
        }
    }

    /**
     * 查询至少有一位员工工资低于5000的部门。
     */
    @Test
    public void eg6() {
        Session session = null;
        try {
            // 获取session
            session = HibernateUtil.currentSession();
            List<Dept> list = session
                    .createQuery(
                            "from Dept d where 5000>any(select e.salary from d.emps e)")
                    .list();
            for (Dept dept : list) {
                System.out.println(dept.getDeptName());
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 关闭session
            if (session != null)
                session.close();
        }
    }

    /**
     * ，查询员工工资正好是5000元的部门
     */
    @Test
    public void eg7() {
        Session session = null;
        try {
            // 获取session
            session = HibernateUtil.currentSession();
            List<Dept> list = session
                    .createQuery(
                            "from Dept d where 5000=any(select e.salary from d.emps e)")
                    .list();
            for (Dept dept : list) {
                System.out.println(dept.getDeptName());
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 关闭session
            if (session != null)
                session.close();
        }
    }

    /**
     * 查询员工工资正好是5000元的部门
     */
    @Test
    public void eg7_1() {
        Session session = null;
        try {
            // 获取session
            session = HibernateUtil.currentSession();
            List<Dept> list = session
                    .createQuery(
                            "from Dept d where 5000=some(select e.salary from d.emps e)")
                    .list();
            for (Dept dept : list) {
                System.out.println(dept.getDeptName());
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 关闭session
            if (session != null)
                session.close();
        }
    }

    /**
     * 查询员工工资正好是5000元的部门
     */
    @Test
    public void eg7_2() {
        Session session = null;
        try {
            // 获取session
            session = HibernateUtil.currentSession();
            List<Dept> list = session
                    .createQuery(
                            "from Dept d where 5000 in (select e.salary from d.emps e)")
                    .list();
            for (Dept dept : list) {
                System.out.println(dept.getDeptName());
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 关闭session
            HibernateUtil.closeSession();
        }
    }

    /**
     * 查询至少有一位员工的部门
     */
    @Test
    public void eg8() {
        Session session = null;
        try {
            // 获取session
            session = HibernateUtil.currentSession();
            List<Dept> list = session.createQuery(
                    "from Dept d where exists (from d.emps)").list();
            for (Dept dept : list) {
                System.out.println(dept.getDeptName());
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 关闭session
            HibernateUtil.closeSession();
        }
    }

    /**
     * 查询指定员工所在部门
     */
    @Test
    public void eg9() {
        Session session = null;
        try {
            // 获取session
            session = HibernateUtil.currentSession();
            Emp emp = new Emp();
            emp.setEmpNo(1);
            List<Dept> list = session
                    .createQuery("from Dept d where ? in elements (d.emps)")
                    .setParameter(0, emp).list();
            for (Dept dept : list) {
                System.out.println(dept.getDeptName());
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 关闭session
            HibernateUtil.closeSession();
        }
    }

    /**
     * 查询指定员工所在部门
     */
    @Test
    public void eg9_1() {
        Session session = null;
        try {
            // 获取session
            session = HibernateUtil.currentSession();
            Emp emp = new Emp();
            emp.setEmpNo(1);
            List<Dept> list = session
                    .createQuery("from Dept d where ? in (from d.emps)")
                    .setParameter(0, emp).list();
            for (Dept dept : list) {
                System.out.println(dept.getDeptName());
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 关闭session
            HibernateUtil.closeSession();
        }
    }

    /**
     * 查询员工个数大于5的部门
     */
    @Test
    public void eg10() {
        Session session = null;
        try {
            // 获取session
            session = HibernateUtil.currentSession();
            List<Dept> list = session.createQuery(
                    "from Dept d where  d.emps.size>5").list();
            for (Dept dept : list) {
                System.out.println(dept.getDeptName());
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 关闭session
            HibernateUtil.closeSession();
        }
    }

    /**
     * 查询员工个数大于5的部门
     */
    @Test
    public void eg10_1() {
        Session session = null;
        try {
            // 获取session
            session = HibernateUtil.currentSession();
            List<Dept> list = session.createQuery(
                    "from Dept d where  size(d.emps)>5").list();
            for (Dept dept : list) {
                System.out.println(dept.getDeptName());
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 关闭session
            HibernateUtil.closeSession();
        }
    }
}