mybatis学习：mybatis的注解开发CRUD操作

Dao层：

 1 public interface IUserDao {
 2 
 3     /**
 4      * 查询所有结果
 5      * @return
 6      */
 7     @Select("select * from user")
 8     List<User> findAll();
 9 
10     /**
11      * 保存用户
12      * @param user
13      */
14     @Insert("insert into user(username,address,sex,birthday) values(#{username},#{address},#{sex},#{birthday})")
15     void saveUser(User user);
16 
17     /**
18      * 更新用户
19      * @param user
20      */
21     @Update("update user set username = #{username},address = #{address},sex = #{sex},birthday = #{birthday} where id = #{id}")
22     void updateUser(User user);
23 
24     /**
25      * 删除用户
26      * @param id
27      */
28     @Delete("delete from user where id = #{id}")
29     void deleteUser(Integer id);
30 
31     /**
32      * 根据id查询用户
33      * @param userId
34      * @return
35      */
36     @Select("select * from user where id = #{id}")
37     User findById(Integer userId);
38 
39     /**
40      * 根据用户模糊查询
41      * @param username
42      * @return
43      */
44 //    @Select("select * from user where username like #{username}")     //参数占位符
45     @Select("select * from user where username like '%${value}%'")      //字符串拼接
46     List<User> findUserByName(String username);
47 
48     /**
49      * 查询总用户数量
50      * @return
51      */
52     @Select("select count(*) from user")
53     int findTotalUser();
54 
55 }

test：

 1 public class AnnotationCRUDTest {
 2 
 3     private InputStream in;
 4     private SqlSessionFactory factory;
 5     private SqlSession session;
 6     private IUserDao userDao;
 7 
 8     @Before
 9     public void init() throws IOException {
10         in = Resources.getResourceAsStream("SqlMapConfig.xml");
11         factory = new SqlSessionFactoryBuilder().build(in);
12         session = factory.openSession();
13         userDao = session.getMapper(IUserDao.class);
14     }
15 
16     @After
17     public  void  destory() throws IOException {
18         session.commit();
19         session.close();
20         in.close();
21     }
22 
23     @Test
24     public  void testSave(){
25         User user = new User();
26         user.setUsername("flypig");
27         user.setAddress("中国");
28 
29         userDao.saveUser(user);
30     }
31 
32     @Test
33     public void testUpdate(){
34         User user = new User();
35         user.setId(49);
36         user.setUsername("flypighhh");
37         user.setAddress("China");
38         user.setSex("男");
39         user.setBirthday(new Date());
40 
41         userDao.updateUser(user);
42     }
43 
44     @Test
45     public void testDelete(){
46         userDao.deleteUser(49);
47     }
48 
49     @Test
50     public void testFindOne(){
51         User user = userDao.findById(48);
52         System.out.println(user);
53     }
54 
55     @Test
56     public void testFindUserByName(){
57         //List<User> users = userDao.findUserByName("%王%");
58         List<User> users = userDao.findUserByName("王");
59         for (User user : users) {
60             System.out.println(user);
61         }
62     }
63 
64     @Test
65     public void testFindTotal(){
66         int total = userDao.findTotalUser();
67         System.out.println(total);
68     }
69 
70 }