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pom.xml添加相关依赖

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>

   <groupId>com.example</groupId>
   <artifactId>demo</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <packaging>war</packaging>

   <name>demo</name>
   <description>Demo project for Spring Boot</description>

   <parent>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-parent</artifactId>
      <version>2.0.2.RELEASE</version>
      <relativePath/>
   </parent>

   <properties>
      <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
      <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
      <java.version>1.8</java.version>
   </properties>

   <dependencies>
      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-web</artifactId>
         <exclusions>
            <exclusion>
               <groupId>org.springframework.boot</groupId>
               <artifactId>spring-boot-starter-logging</artifactId>
            </exclusion>
         </exclusions>
      </dependency>

      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-log4j2</artifactId>
         <version>1.5.8.RELEASE</version>
      </dependency>

      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-configuration-processor</artifactId>
         <optional>true</optional>
      </dependency>

      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-tomcat</artifactId>
         <scope>provided</scope>
      </dependency>

      <!-- 单元测试 -->
      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-test</artifactId>
      </dependency>

    
      <!-- 引入jdbc和mysql驱动包,spring boot 默认会使用HikariCP作为数据库连接池 -->
      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-jdbc</artifactId>
      </dependency>

      <dependency>
         <groupId>mysql</groupId>
         <artifactId>mysql-connector-java</artifactId>
         <version>5.1.35</version>
      </dependency>

      <!-- spring-boot整合mybatis -->
      <dependency>
         <groupId>org.mybatis.spring.boot</groupId>
         <artifactId>mybatis-spring-boot-starter</artifactId>
         <version>1.3.1</version>
      </dependency>

   </dependencies>

   <build>
      <finalName>demo</finalName>
      <plugins>
         <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
         </plugin>

      </plugins>
   </build>

</project>

项目整体结构

application.properties新增mysql和mybatis相关配置

#mysql
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/app_test?Unicode=true&characterEncoding=UTF-8&allowMultiQueries=true
spring.datasource.username=root
spring.datasource.password=root

#mybatis
mybatis.mapper-locations=classpath:mapper/*Dao.xml
mybatis.config-location=classpath:mapper/conf/mybatis_cfg.xml
mybatis.type-aliases-package=com.example.demo.model

根据项目结构新增相关包

model,dao以及mapper dao配置文件为自动生成，可参考文章 idea配置自动生成mybaits实体类和mapper.xml

dao接口需要添加注解：@mapper

参考如下：

Example.java
public class Example implements Serializable {
    private Integer id;

    private String userName;

    private String addr;

    private Byte sex;
  
  	//省略get set toString方法  
 	
 }

ExampleDao.java
@Mapper
public interface ExampleDao {
    int deleteByPrimaryKey(Integer id);

    int insert(Example record);

    int insertSelective(Example record);

    Example selectByPrimaryKey(Integer id);

    int updateByPrimaryKeySelective(Example record);

    int updateByPrimaryKey(Example record);
}

ExampleDao.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.demo.dao.ExampleDao">
  <resultMap id="BaseResultMap" type="com.example.demo.model.Example">
    <id column="id" jdbcType="INTEGER" property="id" />
    <result column="user_name" jdbcType="VARCHAR" property="userName" />
    <result column="addr" jdbcType="VARCHAR" property="addr" />
    <result column="sex" jdbcType="TINYINT" property="sex" />
  </resultMap>
  <sql id="Base_Column_List">
    id, user_name, addr, sex
  </sql>
  <select id="selectByPrimaryKey" parameterType="java.lang.Integer" resultMap="BaseResultMap">
    select 
    <include refid="Base_Column_List" />
    from example
    where id = #{id,jdbcType=INTEGER}
  </select>
  <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer">
    delete from example
    where id = #{id,jdbcType=INTEGER}
  </delete>
  <insert id="insert" keyColumn="id" keyProperty="id" parameterType="com.example.demo.model.Example" useGeneratedKeys="true">
    insert into example (user_name, addr, sex
      )
    values (#{userName,jdbcType=VARCHAR}, #{addr,jdbcType=VARCHAR}, #{sex,jdbcType=TINYINT}
      )
  </insert>
  <insert id="insertSelective" keyColumn="id" keyProperty="id" parameterType="com.example.demo.model.Example" useGeneratedKeys="true">
    insert into example
    <trim prefix="(" suffix=")" suffixOverrides=",">
      <if test="userName != null">
        user_name,
      </if>
      <if test="addr != null">
        addr,
      </if>
      <if test="sex != null">
        sex,
      </if>
    </trim>
    <trim prefix="values (" suffix=")" suffixOverrides=",">
      <if test="userName != null">
        #{userName,jdbcType=VARCHAR},
      </if>
      <if test="addr != null">
        #{addr,jdbcType=VARCHAR},
      </if>
      <if test="sex != null">
        #{sex,jdbcType=TINYINT},
      </if>
    </trim>
  </insert>
  <update id="updateByPrimaryKeySelective" parameterType="com.example.demo.model.Example">
    update example
    <set>
      <if test="userName != null">
        user_name = #{userName,jdbcType=VARCHAR},
      </if>
      <if test="addr != null">
        addr = #{addr,jdbcType=VARCHAR},
      </if>
      <if test="sex != null">
        sex = #{sex,jdbcType=TINYINT},
      </if>
    </set>
    where id = #{id,jdbcType=INTEGER}
  </update>
  <update id="updateByPrimaryKey" parameterType="com.example.demo.model.Example">
    update example
    set user_name = #{userName,jdbcType=VARCHAR},
      addr = #{addr,jdbcType=VARCHAR},
      sex = #{sex,jdbcType=TINYINT}
    where id = #{id,jdbcType=INTEGER}
  </update>
</mapper>

mybatis_cfg.xml，为mybaits配置文件

参考如下：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
	<settings>
		<setting name="cacheEnabled" value="true" /><!-- 是否开启缓存 -->
		<setting name="lazyLoadingEnabled" value="true" />
		<setting name="multipleResultSetsEnabled" value="true" />
		<setting name="useColumnLabel" value="true" />
		<setting name="useGeneratedKeys" value="true" />
		<setting name="defaultExecutorType" value="REUSE" />
	</settings>
	
</configuration>

dao测试类

ExampleDaoTest.java
@RunWith(SpringRunner.class)
@SpringBootTest(classes = DemoApplication.class) //DemoApplication.class 为项目启动的那个类
public class ExampleDaoTest {

    @Autowired
    private ExampleDao exampleDao;

    @Test
    public void saveBean(){
        Example bean = new Example();
        bean.setUserName("ZhangSan");
        bean.setAddr("ShangHai");
        bean.setSex((byte)1);
        exampleDao.insert(bean);
    }

    @Test
    public void getBean(){
        Example bean = exampleDao.selectByPrimaryKey(3360);
        System.out.println(bean);
    }
}