Question

我有3个类玩家（PK Id_player），匹配（PK Id_match）和铭文（PK应该是Id_player和Id_match）。玩家只有一个且只有一个铭文（1个玩家 - > 1个铭文），并且匹配可以在许多铭文中（1个匹配 - ＆gt;许多文字）。所以表格铭文有2个外键IDI_player和Id_match，问题是我不知道如何告诉hibernate这两个外键必须是铭文表的组合原型键。这是我的代码::

@Entity

@Table(name = "Players")

public class Player{

    @Id @GeneratedValue
private Long Id_player;

@OneToOne
@JoinColumn(name = "payer_id")
Inscription Inscription;}

@Entity
@Table(name="Matches")
public class Match{

    @Id @GeneratedValue
    private long Id_match;

    @OneToMany
    @JoinColumn(name = "id_match")
    List<Inscription> inscriptions= new ArrayList<>();

我应该在Inscription类上写些什么来使Fk成为一个组合PK。感谢

Answer 1

检查一下：

播放器

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.OneToOne;
import javax.persistence.Table;

@Entity

@Table(name = "Players")

public class Player {

    @Id
    @GeneratedValue
    private Long Id_player;

    @OneToOne
    private Match match;

}

匹配

import java.util.List;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.OneToMany;
import javax.persistence.Table;

@Entity
@Table(name="Matches")
public class Match{

    @Id @GeneratedValue
    private long Id_match;

    @OneToMany
    @JoinTable(name="Inscription",
    joinColumns=@JoinColumn(name="MATCH_ID"),
    inverseJoinColumns=@JoinColumn(name="PLAYER_ID"))
    private List<Player> playersList;


    public long getId_match() {
        return Id_match;
    }

    public void setId_match(long id_match) {
        Id_match = id_match;
    }

    public List<Player> getPlayersList() {
        return playersList;
    }

    public void setPlayersList(List<Player> playersList) {
        this.playersList = playersList;
    }


}

映射主键由两个外键组成？过冬

1 个答案: