mybatis 梳理5-- 增删改查 基于注解 （少）

1、接口中添加注解

public interface AdminMapper {

/**
* 保存管理员
* @param admin
* @return
*/
@Insert("insert into admin (username,password) values (#{username},#{password})")
int saveAdmin(Admin admin);



/**
* 更新管理员
* @param admin
* @return
*/
@Update("update admin set username=#{username} , password=#{password} where id = #
{id}")
int updateAdmin(Admin admin);




/**
* 删除管理员
* @param admin
* @return
*/
@Delete("delete from admin where id=#{id}")
int deleteAdmin(int id);





/**
* 根据id查找管理员
* @param id
* @return
*/
@Select("select id,username,password from admin where id=#{id}")
Admin findAdminById(@Param("id") int id);




/**
* 查询所有的管理员
* @return
*/
@Select("select id,username,password from admin")
List<Admin> findAllAdmins();
}

2、核心配置文件中配置

<mappers>
<mapper class="com.xinzhi.dao.AdminMapper"/>
</mappers>

3、进行测试

public class TestAdmin {

private SqlSession session;

@Before
public void before() {
try {
String resource = "mybatis-config.xml";
InputStream inputStream = Resources.getResourceAsStream(resource);
SqlSessionFactory sqlSessionFactory = new
SqlSessionFactoryBuilder().build(inputStream);
session = sqlSessionFactory.openSession();
} catch (IOException e) {
e.printStackTrace();
}
}




@Test
public void testSaveAdmin() {
AdminMapper mapper = session.getMapper(AdminMapper.class);
Admin admin = new Admin(1,"微微姐","12345678");
int i = mapper.saveAdmin(admin);
System.out.println(i);
}




@Test
public void testUpdateAdmin() {
AdminMapper mapper = session.getMapper(AdminMapper.class);
Admin user = new Admin(1,"磊磊哥","12345678");
int i = mapper.updateAdmin(user);
System.out.println(i);
}



@Test
public void testDeleteAdmin(){
AdminMapper mapper = session.getMapper(AdminMapper.class);
int i = mapper.deleteAdmin(2);
System.out.println(i);
}




@Test
public void testGetAdminById(){
AdminMapper mapper = session.getMapper(AdminMapper.class);
Admin admin = mapper.findAdminById(1);
System.out.println(admin);
}




@Test
public void testGetAllAdmins(){
AdminMapper mapper = session.getMapper(AdminMapper.class);
List<Admin> admins = mapper.findAllAdmins();
for (Admin admin : admins) {
System.out.println(admin);
}
}




@After
public void close(){
//提交
session.commit();
session.close();
}
}

4. 结构

不需要AdminMapper.xml

TestAdmin里面的东西不变