hibernate-criteria查询

Criteria查询是Hibernate提供的一种查询方式

下面就一个员工和部门来列一个总体的例子

package Test;

import java.util.ArrayList;
import java.util.List;

import org.hibernate.Criteria;
import org.hibernate.Session;
import org.hibernate.criterion.Criterion;
import org.hibernate.criterion.MatchMode;
import org.hibernate.criterion.Restrictions;
import org.junit.Test;

import com.sun.org.apache.regexp.internal.recompile;

import entity.Dept;
import entity.Emp;

import util.HibernateSessionFactory;

public class TestCriteria {
    /*
    通过criteria查询部门信息
    */
    @Test
    public void test1(){
        Session session =HibernateSessionFactory.getSession();
        Criteria criteria = session.createCriteria(Dept.class);
        List<Dept> list=criteria.list();
        System.out.println("通过criteria查询部门信息");
        for (Dept dept : list) {
            System.out.println(dept.getDname());
        }
    }
    
    /**
     * 查询位置在二楼的部门
     */
    @Test
    public void test2(){
        Session session =HibernateSessionFactory.getSession();
        Criteria criteria = session.createCriteria(Dept.class);
                //.add(Restrictions.eq("loc", "二楼"));
        Criterion criterion = Restrictions.eq("loc", "二楼");
        criteria.add(criterion);
        List<Dept> list=criteria.list();
        System.out.println("查询位置在二楼的部门");
        for (Dept dept : list) {
            System.out.println(dept.getDname()+"\t"+dept.getLoc());
        }
        
    }
    
    /**
     * 查询工资高于2000元的员工
     */
    @Test
    public void test3(){
        Session session =HibernateSessionFactory.getSession();
        Criteria criteria = session.createCriteria(Emp.class)
                .add(Restrictions.gt("sal", 2000D));
        
        List<Emp> list=criteria.list();
        System.out.println("查询工资高于2000元的员工");
        for (Emp emp : list) {
            System.out.println(emp.getEname()+"\t"+emp.getSal());
        }
        
    }
    
    /**
     * 查询不属于任何部门的员工
     */
    @Test
    public void test4(){
        Session session =HibernateSessionFactory.getSession();
        Criteria criteria = session.createCriteria(Emp.class)
                .add(Restrictions.isNull("dept"));
        
        List<Emp> list=criteria.list();
        System.out.println("查询不属于任何部门的员工");
        for (Emp emp : list) {
            System.out.println(emp.getEname()+"\t"+emp.getSal());
        }
        
    }
    
    /**
     * 查询职位是“MANAGER”的员工
     */
    @Test
    public void test5(){
        Session session =HibernateSessionFactory.getSession();
        Criteria criteria = session.createCriteria(Emp.class)
                .add(Restrictions.eq("job", "MANAGER"));
        
        List<Emp> list=criteria.list();
        System.out.println("查询职位是“MANAGER”的员工");
        for (Emp emp : list) {
            System.out.println(emp.getEname()+"\t"+emp.getJob());
        }
        
    }
    /**
     * 查询职位是“MANAGER”或“CLERK”的员工
     */
    @Test
    public void test6(){
        Session session =HibernateSessionFactory.getSession();
        List<String> joblist=new ArrayList<String>();
        joblist.add("MANAGER");
        joblist.add("CLERK");
        Criteria criteria = session.createCriteria(Emp.class)
                .add(Restrictions.in("job", joblist));
        
        List<Emp> list=criteria.list();
        System.out.println("查询职位是“MANAGER”或“CLERK”的员工");
        for (Emp emp : list) {
            System.out.println(emp.getEname()+"\t"+emp.getJob());
        }
        
    }
    /**
     * 查询工资在2000到5000元之间的员工
     */
    @Test
    public void test7(){
        Session session =HibernateSessionFactory.getSession();
        
        Criteria criteria = session.createCriteria(Emp.class)
                //.add(Restrictions.ge("sal", 2000D))
                //.add(Restrictions.le("sal", 5000D));
                .add(Restrictions.between("sal", 2000D, 5000D));
        List<Emp> list=criteria.list();
        System.out.println("查询工资在2000到5000元之间的员工");
        for (Emp emp : list) {
            System.out.println(emp.getEname()+"\t"+emp.getSal());
        }
        
    }
    /**
     * 查询姓名中包括 “s”的员工
     */
    @Test
    public void test8(){
        Session session =HibernateSessionFactory.getSession();
        
        Criteria criteria = session.createCriteria(Emp.class)
                //.add(Restrictions.like("ename", "%s%").ignoreCase());//忽略大小写
                .add(Restrictions.like("ename", "s", MatchMode.ANYWHERE).ignoreCase());
        List<Emp> list=criteria.list();
        System.out.println("查询姓名中包括 “s”的员工");
        for (Emp emp : list) {
            System.out.println(emp.getEname()+"\t"+emp.getSal());
        }
        
    }
    
    /**
     * 查询职位是“analyser”或“accountant”的员工
     */
    @Test
    public void test9(){
        Session session =HibernateSessionFactory.getSession();
        
        Criteria criteria = session.createCriteria(Emp.class)
                //两个or
                //.add(Restrictions.or(Restrictions.eq("job", "CLERK"), 
                        //Restrictions.eq("job", "SALESMAN")));
                //三个
                .add(Restrictions.disjunction()
                        .add(Restrictions.eq("job", "SALESMAN"))
                        .add(Restrictions.eq("job", "CLERK"))
                        .add(Restrictions.eq("job","MANAGER"))
                        );
        List<Emp> list=criteria.list();
        System.out.println("查询职位是“analyser”或“accountant”的员工--几种方法");
        for (Emp emp : list) {
            System.out.println(emp.getEname()+"\t"+emp.getSal()+"\t"+emp.getJob());
        }
        
    }
    
    /**
     * 查询没有员工的部门
     */
    @Test
    public void test10(){
        Session session =HibernateSessionFactory.getSession();
        
        Criteria criteria = session.createCriteria(Dept.class)
                .add(Restrictions.isEmpty("emps"));
        List<Dept> list=criteria.list();
        System.out.println(" 查询没有员工的部门");
        for (Dept dept : list) {
            System.out.println(dept.getDname());
        }
        
    }
    
}