SpringBoot集成mybatis。

可以通过以下步骤将SpringBoot与MyBatis集成：

1. 在pom.xml中添加相关的依赖：

<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>2.2.0</version>
</dependency>

2. 在application.properties中配置数据库相关信息：

spring.datasource.url=jdbc:mysql://localhost:3306/mydatabase
spring.datasource.username=myusername
spring.datasource.password=mypassword
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

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

3. 创建MyBatis Mapper接口和XML文件：

package com.example.mapper;

import com.example.entity.User;

@Mapper
public interface UserMapper {
    @Select("SELECT * FROM user WHERE id = #{id}")
    User findById(Long id);
}

<?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.mapper.UserMapper">
    <resultMap id="userMap" type="com.example.entity.User">
        <id column="id" property="id"/>
        <result column="username" property="username"/>
        <result column="password" property="password"/>
        <result column="email" property="email"/>
    </resultMap>
    <select id="findById" resultMap="userMap">
        SELECT * FROM user WHERE id = #{id}
    </select>
</mapper>

4. 在Controller中调用Mapper方法：

@RestController
@RequestMapping("/users")
public class UserController {

    @Autowired
    private UserMapper userMapper;

    @GetMapping("/{id}")
    public User findById(@PathVariable Long id) {
        return userMapper.findById(id);
    }
}