外键在 springboot jpa 一对多中以 null 的形式出现

Question

当我保存实体时，子表中的外键是 null

父 class 是由子 class slotdetails 映射到一对多关系的约会

package com.inskade.inkflow.appoinments;

import java.time.LocalDate;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.Table;

import org.hibernate.annotations.CreationTimestamp;
import org.hibernate.annotations.UpdateTimestamp;

import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.Setter;

@Getter
@Setter
@AllArgsConstructor
@Entity()
@Table(name = "appoinment_detail")

public class Appointment  {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @CreationTimestamp
    @Column(name = "created_at", insertable = true, updatable = false)
    private Date createdAt;
    @UpdateTimestamp
    private Date updatedAt;


    
    private String userId;
    private LocalDate appointmentDate;

    
      @OneToMany(
                mappedBy = "appoinment",
                cascade = CascadeType.ALL,
                orphanRemoval = true
            )
            private List<SlotDetails> slotDetails = new ArrayList<>();
      
        public void addSlots(SlotDetails slot) {
            slotDetails.add(slot);
            slot.setAppoinment(this);
        }
     
        public void removeSlot(SlotDetails slot) {
            slotDetails.remove(slot);
            slot.setAppoinment(null);
        }
     
    }
    

子 class 是与父约会具有多对一关系的 Slotdetails

import java.sql.Time;
import java.util.UUID;

import javax.persistence.Embeddable;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.ManyToOne;

import lombok.Data;
import lombok.Getter;
import lombok.Setter;

@Data
@Entity
public class SlotDetails {
    
    
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long slotId;
     @ManyToOne(fetch = FetchType.LAZY)
     
        private Appoinment appoinment;
     private Time appointmentStartTime;
        private Time appointmentEndTime;
    private String bookingStatus
    private String bookedClientId;
    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (!(o instanceof SlotDetails )) return false;
        return slotId != null && slotId.equals(((SlotDetails) o).getSlotId());
    }
 
    @Override
    public int hashCode() {
        return getClass().hashCode();
    }

}

存储库

import java.time.LocalDate;
import java.util.List;

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Modifying;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.query.Param;
import org.springframework.stereotype.Repository;

@Repository
public interface AppoinmentsRepository extends JpaRepository<Appoinment, Long> {


    List<Appoinment> findAllByAppointmentDateBetween(LocalDate startDate, LocalDate endDate);

}

孩子的表格信息显示

FOREIGN KEY (`appoinment_id`) REFERENCES `appoinment_detail` (`id`)

当我调用 appoinmentRepository.save 时，子表中的 appoinment_id 以 null 的形式出现，在父表中一切都很好

请帮忙

Answer 1

您尚未在SlotDetails中指定@JoinColumn进行appointment

@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name="appoinment_id", nullable = false)
private Appoinment appoinment;