<dependency>
  <groupId>org.mybatis.spring.boot</groupId>
  <artifactId>mybatis-spring-boot-starter</artifactId>
  <version>1.2.1-SNAPSHOT</version>
</dependency>

dependencies {
  compile("org.mybatis.spring.boot:mybatis-spring-boot-starter:1.2.1-SNAPSHOT")
}

--src 
 --main
 --java
  --com.example
  --dao
   --UserDao.java
  --entity
   --User.java
  --DemoApplication.java
  --UserSex.java
 --resources
 --mapper
  --UserMapper.xml
 --application.properties

@Data
public class User {
  private Long id;
  private String userName;
  private String password;
  private UserSex userSex;
  private String nickName;
}

DROP TABLE IF EXISTS user;
CREATE TABLE user(
 id BIGINT(20) NOT NULL AUTO_INCREMENT COMMENT '主键id',
 user_name VARCHAR(32) DEFAULT NULL COMMENT '用户名',
 password VARCHAR(32) DEFAULT NULL COMMENT '密码',
 user_sex VARCHAR(32) DEFAULT NULL ,
 nick_name VARCHAR(32) DEFAULT NULL ,
 PRIMARY KEY (id)
) ENGINE = InnoDB DEFAULT CHARSET = utf8;

@Mapper
public interface UserDao {
  @Select("SELECT * FROM user WHERE id = #{id}")
  @Results({
      @Result(property = "userName", column = "user_name"),
      @Result(property = "password", column = "password"),
      @Result(property = "userSex", column = "user_sex", javaType = UserSex.class),
      @Result(property = "nickName",column = "nick_name")
  })
  User findById(@Param("id") Long id);
  @Insert("INSERT INTO user (user_name,password,user_sex ) VALUES (#{userName},#{password},#{userSex})")
  void save(User user);
  @Update("UPDATE user set user_name = #{userName}, nick_name = #{nickName} WHERE id = #{id}")
  void update(User user);
  @Delete("DELETE FROM user where id = #{id}")
  void remove(Long id);
}

@RunWith(SpringRunner.class)
@SpringBootTest
public class UserMapperTest {
  @Autowired
  UserDao userDao;
  @Test
  public void test(){
    User one = new User();
    one.setUserName("张三");
    one.setPassword("123456");
    one.setUserSex(UserSex.MAN);
    userDao.save(one);
    User two = new User();
    two.setUserName("李四");
    two.setPassword("123456");
    two.setUserSex(UserSex. WOMAN);
    userDao.save(two);
  }
}

mybatis.type-aliases-package= com.example.entity
mybatis.mapper-locations=classpath:mapper/*.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.example.dao.UserDao">
  <resultMap id="userMap" type="com.example.entity.User">
    <result column="id" property="id"/>
    <result column="user_name" property="userName"/>
    <result column="password" property="password"/>
    <result column="user_sex" property="userSex" javaType="com.example.UserSex"/>
    <result column="nick_name" property="nickName"/>
  </resultMap>
  <insert id="save" parameterType="com.example.entity.User">
    INSERT INTO user (user_name,password,user_sex ) VALUES (#{userName},#{password},#{userSex})
  </insert>
  <delete id="remove" parameterType="java.lang.Long">
    DELETE FROM user where id = #{id}
  </delete>
  <update id="update" parameterType="com.example.entity.User">
    UPDATE user SET user_name = #{userName}, nick_name =#{nickName} WHERE id = #{id}
  </update>
  <select id="findById" parameterType="java.lang.Long" resultMap="userMap">
    SELECT * FROM user WHERE id = #{id}
  </select>
</mapper>

public interface UserDao {
  User findById(Long id);
  void save(User user);
  void update(User user);
  void remove(Long id);
}

@SpringBootApplication
@MapperScan("com.example.dao")
public class DemoApplication {
 public static void main(String[] args) {
 SpringApplication.run(DemoApplication.class, args);
 }
}