Hibernate【3】——Service层

最新推荐文章于 2019-09-21 19:24:14 发布

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最新推荐文章于 2019-09-21 19:24:14 发布

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文章标签： java

本文介绍了一个用户服务接口(UserService)的设计及其实现(UserServiceImpl)，包括添加、修改、删除用户等功能，并通过测试类验证了各功能的正确性。

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1:整体目录

(1)完成UserSerivce接口

(2)完成UserSerivceImpl类,继承UserSerivce接口

(3)写测试类

2:UserSerivce接口

 1 package com.demo.service;
 2 
 3 import java.util.List;
 4 
 5 import com.demo.model.User;
 6 
 7 public interface UserService {
 8     /**
 9      * 添加用户
10      * @param user
11      * @return
12      */
13     public boolean add(User user);
14     
15     /**
16      * 修改用户
17      * @param user
18      * @return
19      */
20     public boolean update(User user);
21     
22     /**
23      * 删除用户
24      * @param user
25      * @return
26      */
27     public boolean delete(User user);
28     
29     /**
30      * 根据id获取用户
31      * @param obj
32      * @param id
33      * @return
34      */
35     public User getById(Class obj,int id);
36     
37     /**
38      * 统计符合一定条件用户的数量
39      * @param hql
40      * @param param
41      * @return
42      */
43     public int getCount(String hql,String[] param);
44     
45     /**
46      * 查询符合一定条件的用户
47      * @param hql
48      * @param param
49      * @return
50      */
51     public List<User> query(String hql,String[] param);
52     
53 }

3:UserSerivceImpl类

package com.demo.service;

import java.util.List;

import com.demo.dao.BaseDAO;
import com.demo.model.User;

public class UserServiceImpl implements UserService {

    private BaseDAO dao = new BaseDAO();
    @Override
    public boolean add(User user) {
        boolean flag = false;
        flag = dao.add(user);
        return flag;
    }

    @Override
    public boolean delete(User user) {
        boolean flag = false;
        flag = dao.delete(user);
        return flag;
    }

    @Override
    public User getById(Class obj, int id) {
        User u = (User)dao.get(User.class, id);
        return u;
    }

    @Override
    public int getCount(String hql, String[] param) {
        int cnt = 0;
        cnt = dao.getCount(hql, param);
        return cnt;
    }

    @Override
    public List<User> query(String hql, String[] param) {
        List<User> list = dao.query(hql, param);
        return list;
    }

    @Override
    public boolean update(User user) {
        boolean flag = false;
        flag = dao.update(user);
        return flag;
    }

}

4:TestUserSerivce类

注意统计Count的hql语句:

select count(*) from User u where u.userName=?

package com.demo.test;

import com.demo.model.User;
import com.demo.service.UserService;
import com.demo.service.UserServiceImpl;

public class TestUserService {
    public static void main(String[] args) {
        UserService us = new UserServiceImpl();
        //test add
        User user1 = new User();
        user1.setUserName("asdf");
        user1.setUserPwd("1234");
        us.add(user1);
        //test delete
        User user2 = new User();
        user2.setId(3);
        us.delete(user2);
        //test getById
        User user3 = us.getById(User.class, 4);
        System.out.println(user3.getId()+"-->"+user3.getUserName()+"-->"+user3.getUserPwd());        
        //test Count
        String[] param = {"asdf"};
        int cnt = us.getCount("select count(*) from User u where u.userName=?", param);        
        System.out.println("共有asdf "+Integer.toString(cnt)+" 个。");
        //test query
        //test update
        User user4 = new User();
        user4.setId(4);
        user4.setUserPwd("000000");
        us.update(user4);
    }
}