mybatis-plus getone

MyBatis-Plus is an enhanced version of MyBatis, a popular Java persistence framework that simplifies database interactions. To retrieve a single record from the database using MyBatis-Plus, you can use the `getOne` method provided by the `IService` interface. Here's an example:

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.IService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserService {

    @Autowired
    private IUserMapper userMapper; // Assuming you have a UserMapper interface

    public User getUserById(Long id) {
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("id", id);
        return userMapper.selectOne(queryWrapper);
    }
}

In this example, we create a `QueryWrapper` object to specify the condition for retrieving the user by their ID. Then, we use the `selectOne` method provided by MyBatis-Plus to fetch the record.

Please note that `getUserById` is just an example method in a service class. You can adapt it to your specific use case.