SpringBoot 项目整合 MyBatis 框架，附带测试示例

以下是整合MyBatis框架的核心步骤和示例代码：

1. 添加MyBatis依赖到pom.xml文件中：

<dependencies>
    <!-- 添加MyBatis依赖 -->
    <dependency>
        <groupId>org.mybatis.spring.boot</groupId>
        <artifactId>mybatis-spring-boot-starter</artifactId>
        <version>2.1.4</version>
    </dependency>
 
    <!-- 添加数据库驱动依赖，以MySQL为例 -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>8.0.23</version>
    </dependency>
</dependencies>

2. 配置数据库信息和MyBatis在application.properties或application.yml文件中：

# application.properties 示例
spring.datasource.url=jdbc:mysql://localhost:3306/your_database?useSSL=false&serverTimezone=UTC
spring.datasource.username=root
spring.datasource.password=yourpassword
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

3. 创建Mapper接口和Mapper XML文件：

// UserMapper.java
package com.example.mapper;
 
public interface UserMapper {
    User selectUserById(int id);
}

<!-- 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.mapper.UserMapper">
    <select id="selectUserById" parameterType="int" resultType="com.example.model.User">
        SELECT * FROM users WHERE id = #{id}
    </select>
</mapper>

4. 在SpringBoot启动类上添加Mapper扫描注解：

// YourApplication.java
package com.example;
 
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
 
@SpringBootApplication
@MapperScan("com.example.mapper")
public class YourApplication {
    public static void main(String[] args) {
        SpringApplication.run(YourApplication.class, args);
    }
}

5. 创建Service和Service实现类：

// UserService.java
package com.example.service;
 
public interface UserService {
    User getUserById(int id);
}

// UserServiceImpl.java
package com.example.service;
 
@Service
public class UserServiceImpl implements UserService {
    @Autowired
    private UserMapper userMapper;
 
    @Override
    public User getUserById(int id) {
        return userMapper.selectUserById(id);
    }
}

6. 创建Controller进行测