一、导入相关包

   <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
              <!--  mybatis.starter依赖-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>${mybatis.starter.version}</version>
        </dependency>
        <!--  lombok 工具包-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>${druid.starter.version}</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>
    </dependencies>

二、配置文件

spring:
  datasource:
    username: root
    password: root
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql///springboot?
    # 数据库连接池
    type: com.alibaba.druid.pool.DruidDataSource
    druid:
      #  最大连接池数量
      max-active: 20
      # 初始化连接池的数量
      initial-size: 5
      # 最小连接池 数量
      min-idle: 2
      # 这里建议配置为TRUE，防止取到的连接不可用
      test-on-borrow: true
      test-on-return: false
      # 验证连接有效与否的SQL，不同的数据配置不同
      validation-query: select
      #通过别名的方式配置扩展插件，常用的插件有：
      #监控统计用的filter:stat日志用的filter:log4j防御sql注入的filter:wall
      filters: stat,slf4j,wall
      #  配置获取连接等待超时的时间 单位毫秒
      max-wait: 6000
# mybatis 配置
mybatis:
  mapper-locations: classpath:mappers/*.xml
  type-aliases-package: com.vp.example.entity
  # settings 下的配置
  configuration:
     # 开启驼峰命名功能 其它的一些属性参考 mybatis-config.xml中的settings属性
     map-underscore-to-camel-case: true

三、主程序入口类开启扫描

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
@SpringBootApplication
// @MapperScan("com.xxx.xxx.mapper")
// 扫描多个包
// @MapperScans({"com.xxx.xxx.mapper",""})
@MapperScan("com.vp.example.mapper")
public class ShiroApplication {
    public static void main(String[] args) {
        SpringApplication.run(ShiroApplication.class, args);
    }
}

四、核心代码

1、建表sql

CREATE TABLE test(
  tid INT AUTO_INCREMENT PRIMARY KEY ,
  title VARCHAR(100)
)

2、实体类

@Data
public class Test {
    public int tid;
    public String title;
}

3、UserMapper接口

public interface TestMapper {
    int insert(Test record);
}

4、UserMapper.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.vp.example.mapper.TestMapper">
  <resultMap id="BaseResultMap" type="com.vp.example.entity.Test">
    <id column="tid" jdbcType="INTEGER" property="tid" />
    <result column="title" jdbcType="VARCHAR" property="title" />
  </resultMap>
  <insert id="insert" keyColumn="tid" keyProperty="tid" parameterType="com.vp.example.entity.Test" useGeneratedKeys="true">
    insert into test (title)
    values (#{title,jdbcType=VARCHAR})
  </insert>
</mapper>

5、测试

@RunWith(SpringRunner.class)
@SpringBootTest
public class MapperTest {
    @Resource
    TestMapper testMapper;
    @Test
    public void insert() {
        TestBean bean = new TestBean();
        bean.setTitle("mybatis");
        testMapper.insert(bean);
    }
}