?????????·??????????????????????

package com.noyaxe.myapp.entity;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;

@Entity
@Table(name = "floor")
public class Floor extends IdEntity {
    private Integer floorNum;
    private Building building;

    @Column(name = "floor_num")
    public Integer getFloorNum() {
        return floorNum;
    }

    public void setFloorNum(Integer floorNum) {
        this.floorNum = floorNum;
    }

    @ManyToOne(optional = false)
    @JoinColumn(name = "building")
    public Building getBuilding() {
        return building;
    }

    public void setBuilding(Building building) {
        this.building = building;
    }
}

???????????FloorDao??

package com.noyaxe.myapp.repository;

import com.noyaxe.myapp.entity.Floor;
import org.springframework.data.jpa.repository.JpaSpecificationExecutor;
import org.springframework.data.repository.PagingAndSortingRepository;

import java.util.List;

public interface FloorDao extends JpaSpecificationExecutor<Floor>?? PagingAndSortingRepository<Floor?? Long> {
    public Floor findByBuildingNameAndFloorNum(String building?? Integer floorNum);

    public List<Floor> findByBuildingName(String building);
}