mybatis plus更新字段为null处理方法

package com.sbmp.bean;
import java.time.LocalDate;
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;
import lombok.Data;
@Data
public class Userinfo {
	/**
	 * 主键id
	 */
	@TableId(type = IdType.AUTO)
	private Integer id;
	/**|
	 * 姓名
	 */
	private String name;
	/**
	 * 生日
	 */
	private LocalDate birthday;
}

package com.sbmp.mapper;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.sbmp.bean.Userinfo;
public interface UserinfoMapper extends BaseMapper<Userinfo>{
}

package com.sbmp.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.sbmp.bean.Userinfo;
import com.sbmp.mapper.UserinfoMapper;
@RestController
public class UserinfoController {
	@Autowired
	private UserinfoMapper userinfoMapper;
	@RequestMapping("/info")
	public String info() {
		Userinfo info = new Userinfo();
		info.setId(1);
		info.setBirthday(null);
		info.setName("薛宝钗");
		userinfoMapper.updateById(info);
		return "成功";
	}
}

package com.sbmp.bean;
import java.time.LocalDate;
import com.baomidou.mybatisplus.annotation.FieldStrategy;
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import lombok.Data;
@Data
public class Userinfo {
	/**
	 * 主键id
	 */
	@TableId(type = IdType.AUTO)
	private Integer id;
	/**|
	 * 姓名
	 */
	private String name;
	/**
	 * 生日
	 */
	@TableField(updateStrategy = FieldStrategy.IGNORED)
	private LocalDate birthday;
}