springboot2整合mybatis

好的，下面是Spring Boot 2整合MyBatis的步骤：

1. 首先，在pom.xml文件中添加以下依赖：

<dependencies>
   <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
   </dependency>
   <dependency>
      <groupId>org.mybatis.spring.boot</groupId>
      <artifactId>mybatis-spring-boot-starter</artifactId>
      <version>2.0.1</version>
   </dependency>
   <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.47</version>
   </dependency>
</dependencies>

2. 在application.properties文件中配置数据库连接信息：

spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&useSSL=false
spring.datasource.username=root
spring.datasource.password=root

3. 创建MyBatis的Mapper接口和SQL映射文件：

Mapper接口：

public interface UserMapper {
    User getUserById(int id);
}

SQL映射文件（resources/mapper/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.example.demo.mapper.UserMapper">

    <select id="getUserById" parameterType="int" resultType="com.example.demo.entity.User">
        select * from user where id = #{id}
    </select>

</mapper>

4. 创建User实体类：

public class User {
    private int id;
    private String name;
    private int age;
    // 省略getter和setter方法
}

5. 在Spring Boot的启动类上添加@MapperScan注解，扫描Mapper接口：

@SpringBootApplication
@MapperScan("com.example.demo.mapper")
public class DemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }

}

6. 在Service中使用Mapper：

@Service
public class UserService {

    @Autowired
    private UserMapper userMapper;

    public User getUserById(int id) {
        return userMapper.getUserById(id);
    }

}

这样，一个简单的Spring Boot 2整合MyBatis的项目就完成了。