cls.java

package models;

import javax.persistence.*;
import java.sql.Timestamp;
import java.util.Collection;

@Entity
@Table(name = "post")
public class Post {
    @Id @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id")
    private int id;

    @OneToOne
    @JoinColumn(name = "user_id")
    private User user;

    @Column(name = "title")
    private String title;

    @Column(name = "content")
    private String content;

    @Column(name = "created_at", insertable=false, updatable = false)
    private Timestamp created_at;

    @Column(name = "view_count")
    private int view_count;

    @ManyToMany(targetEntity = Tag.class)
    @JoinTable(
            name = "post_has_tags",
            joinColumns=@JoinColumn(name = "post_id"),
            inverseJoinColumns=@JoinColumn(name = "tag_id")
    )
    private Collection tags;
}