1、定义操作 user 表的注解接口 UserMapper.java
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
|
package
com.ys.annocation;
import
org.apache.ibatis.annotations.Delete;
import
org.apache.ibatis.annotations.Insert;
import
org.apache.ibatis.annotations.Select;
import
org.apache.ibatis.annotations.Update;
import
com.ys.po.User;
public
interface
UserMapper {
//根据 id 查询 user 表数据
@Select
(
"select * from user where id = #{id}"
)
public
User selectUserById(
int
id)
throws
Exception;
//向 user 表插入一条数据
@Insert
(
"insert into user(username,sex,birthday,address) value(#{username},#{sex},#{birthday},#{address})"
)
public
void
insertUser(User user)
throws
Exception;
//根据 id 修改 user 表数据
@Update
(
"update user set username=#{username},sex=#{sex} where id=#{id}"
)
public
void
updateUserById(User user)
throws
Exception;
//根据 id 删除 user 表数据
@Delete
(
"delete from user where id=#{id}"
)
public
void
deleteUserById(
int
id)
throws
Exception;
}
|
2、向 mybatis-configuration.xml 配置文件中注册 UserMapper.java 文件
|
1
2
3
|
<mappers>
<mapper
class
=
"com.ys.annocation.UserMapper"
/>
</mappers>
|
3、创建测试类
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
|
package
com.ys.test;
import
java.io.InputStream;
import
org.apache.ibatis.session.SqlSession;
import
org.apache.ibatis.session.SqlSessionFactory;
import
org.apache.ibatis.session.SqlSessionFactoryBuilder;
import
org.junit.Before;
import
org.junit.Test;
import
com.ys.annocation.UserMapper;
import
com.ys.po.User;
public
class
UserAnnocationTest {
//定义 SqlSession
SqlSession session =
null
;
@Before
public
void
init(){
//定义mybatis全局配置文件
String resource =
"mybatis-configuration.xml"
;
//加载 mybatis 全局配置文件
InputStream inputStream = CRUDTest.
class
.getClassLoader()
.getResourceAsStream(resource);
//构建sqlSession的工厂
SqlSessionFactory sessionFactory =
new
SqlSessionFactoryBuilder().build(inputStream);
//根据 sqlSessionFactory 产生 session
session = sessionFactory.openSession();
}
//注解的增删改查方法测试
@Test
public
void
testAnncationCRUD()
throws
Exception{
//根据session获取 UserMapper接口
UserMapper userMapper = session.getMapper(UserMapper.
class
);
//调用selectUserById()方法
User user = userMapper.selectUserById(
1
);
System.out.println(user);
//调用 insertUser() 方法
User user1 =
new
User();
user1.setUsername(
"aliks"
);
user1.setSex(
"不详"
);
userMapper.insertUser(user1);
//调用 updateUserById() 方法
User user2 =
new
User();
user2.setId(
6
);
user2.setUsername(
"lbj"
);
userMapper.updateUserById(user2);
//调用 () 方法
userMapper.deleteUserById(
6
);
session.commit();
session.close();
}
}
|
注意：注解配置我们不需要 userMapper.xml 文件了