mybatis修改mysql语句

<!-- UserMapper.xml -->
<mapper namespace="com.example.mapper.UserMapper">
    <update id="updateUserAge" parameterType="com.example.model.User">
        UPDATE user
        SET age = #{age}
        WHERE id = #{id}
    </update>
</mapper>

// UserMapper.java
package com.example.mapper;

import com.example.model.User;

public interface UserMapper {
    int updateUserAge(User user);
}

// UserService.java
package com.example.service;

import com.example.mapper.UserMapper;
import com.example.model.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserService {

    @Autowired
    private UserMapper userMapper;

    public void updateUserAge(int userId, int newAge) {
        User user = new User();
        user.setId(userId);
        user.setAge(newAge);
        userMapper.updateUserAge(user);
    }
}