backend/src/main/java/nju/seec/helper/entity/Reply.java

package nju.seec.helper.entity;

import lombok.Data;
import lombok.experimental.Accessors;
import org.hibernate.annotations.CreationTimestamp;
import org.hibernate.annotations.DynamicInsert;
import org.hibernate.annotations.DynamicUpdate;

import javax.persistence.*;
import java.time.LocalDateTime;

/**
 * @author cst
 */
@Data
@Accessors(chain = true)
@Entity
@Table(name = "reply")
@DynamicUpdate
@DynamicInsert
public class Reply {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @OneToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "comment_id", nullable = false)
    private Comment comment;

    @ManyToOne(cascade = {CascadeType.DETACH, CascadeType.MERGE, CascadeType.REFRESH}, fetch = FetchType.LAZY)
    @JoinColumn(name = "teacher_id", nullable = false)
    private User teacher;

    @Column(nullable = false)
    private String content;

    @Column(name = "create_at", updatable = false, nullable = false)
    @CreationTimestamp
    private LocalDateTime createAt;
}