Hibernate 復合鑰匙帶復合鑰匙

Question

我目前正在映射一個復雜的數據庫模式 wqith HIbernate 並且我遇到了一個實體，該實體具有一個復合鍵和另一個復合鍵。

我有這個表用於具有復合鍵（site_id，id）的角色

CREATE TABLE IF NOT EXISTS core.roles
(
    id uuid NOT NULL DEFAULT gen_random_uuid(),
    name character varying(100) NOT NULL,
    is_system_role boolean NOT NULL DEFAULT FALSE,
    site_id uuid NOT NULL,
    created_at timestamp with time zone NOT NULL DEFAULT now(),
    updated_at timestamp with time zone NOT NULL DEFAULT now(),
    created_by uuid NOT NULL,
    updated_by uuid NOT NULL,
    CONSTRAINT roles_pkey PRIMARY KEY (site_id, id),
    CONSTRAINT roles_name_key UNIQUE (site_id, name),
    CONSTRAINT roles_site_id_fkey FOREIGN KEY (site_id)
        REFERENCES core.sites (id) MATCH SIMPLE
        ON UPDATE NO ACTION
        ON DELETE CASCADE,
    CONSTRAINT roles_created_by_fkey FOREIGN KEY (created_by)
        REFERENCES core.users (id) MATCH SIMPLE
        ON UPDATE NO ACTION
        ON DELETE RESTRICT,
    CONSTRAINT roles_updated_by_fkey FOREIGN KEY (updated_by)
        REFERENCES core.users (id) MATCH SIMPLE
        ON UPDATE NO ACTION
        ON DELETE RESTRICT
);

我有這張表，它有一個復合鍵，它也使用前一個。

CREATE TABLE IF NOT EXISTS core.user_site_roles
(
    user_id uuid NOT NULL,
    site_id uuid NOT NULL,
    role_id uuid NOT NULL,
    created_at timestamp with time zone NOT NULL DEFAULT now(),
    created_by uuid NOT NULL,
    CONSTRAINT user_site_roles_pkey PRIMARY KEY (site_id, user_id, role_id),
    CONSTRAINT user_site_roles_site_id_fkey FOREIGN KEY (site_id)
        REFERENCES core.sites (id) MATCH SIMPLE
        ON UPDATE NO ACTION
        ON DELETE CASCADE,
    CONSTRAINT user_site_roles_role_id_fkey FOREIGN KEY (site_id, role_id)
        REFERENCES core.roles (site_id, id) MATCH SIMPLE
        ON UPDATE NO ACTION
        ON DELETE CASCADE,
    CONSTRAINT user_site_roles_user_id_fkey FOREIGN KEY (user_id)
        REFERENCES core.users (id) MATCH SIMPLE
        ON UPDATE NO ACTION
   
    CONSTRAINT user_site_roles_created_by_fkey FOREIGN KEY (created_by)
        REFERENCES core.users (id) MATCH SIMPLE
        ON UPDATE NO ACTION
        ON DELETE RESTRICT
);

我當前對正在工作的角色的映射是：

@Embeddable
public class CommonId implements Serializable {

    @Type(type = "pg-id-uuid")
    @Column(columnDefinition = "uuid", updatable = false)
    private UUID id;

    @Type(type = "pg-id-uuid")
    @Column(name = "site_id", columnDefinition = "uuid", updatable = false)
    private UUID siteId;
}

@Entity
@Table(name = "roles", schema = "core")
@Data
@TypeDefs({
        @TypeDef(name = "pg-id-uuid", typeClass = PostgresIdUUIDType.class)
})
public class Role extends AuditAtBy implements Serializable {

    @EmbeddedId
    private CommonId roleId;

    @ManyToOne
    @MapsId("siteId")
    @OnDelete(action = OnDeleteAction.CASCADE)
    private Site site;

    @Column(nullable = false, unique = true, length = 100)
    private String name;

    @Column(name = "is_system_role", nullable = false)
    private boolean isSystemRole;

}

我正在嘗試與 UserSiteRole 的復合鍵類似的東西，但 Hibernate 告訴我它需要列到 map 的 roleId 當在表中我只有 id 但 PK 是由兩個值形成的，正如您在腳本中看到的那樣，說實話，不確定如何 map。

@Embeddable
public class UserSiteRoleId implements Serializable {

    @Type(type = "pg-id-uuid")
    @Column(columnDefinition = "uuid", updatable = false)
    private UUID userId;

    @Type(type = "pg-id-uuid")
    @Column(name = "site_id", columnDefinition = "uuid", updatable = false)
    private UUID siteId;

    @Type(type = "pg-id-uuid")
    @Column(name = "role_id", columnDefinition = "uuid", updatable = false)
    private UUID roleId;
}

@Entity
@Table(name = "user_site_roles", schema = "core")
@Data
@TypeDefs({
        @TypeDef(name = "pg-id-uuid", typeClass = PostgresIdUUIDType.class)
})
public class UserSiteRole extends AuditCreated implements Serializable {

    @EmbeddedId
    private UserSiteRoleId userSiteRoleId;

    @ManyToOne
    @MapsId("userId")
    @JoinColumn(name = "user_id", columnDefinition = "uuid", nullable = false)
    @Type(type = "pg-id-uuid")
    @OnDelete(action = OnDeleteAction.CASCADE)
    private User user;

    @ManyToOne
    @MapsId("siteId")
    @JoinColumn(name = "site_id", columnDefinition = "uuid", nullable = false)
    @Type(type = "pg-id-uuid")
    @OnDelete(action = OnDeleteAction.CASCADE)
    private Site site;

    @ManyToOne
    @MapsId("roleId")
    @JoinColumn(name = "role_id", columnDefinition = "uuid", nullable = false)
    @Type(type = "pg-id-uuid")
    @OnDelete(action = OnDeleteAction.CASCADE)
    private Role role;

}

我將不勝感激有關如何 map 它的任何想法，我從來沒有對 map 如此復雜的關系，所以不知道在這種情況下如何進行。

Answer 1

這回答了你的問題了嗎？ jpa hibernate 復合外鍵映射

實際上這很有用，因為它清楚地表明我們可以將映射從 embeddedId 更改為 IdClass 並使其工作。

這是我們的新 IdClass，非常簡單：

@Data
@NoArgsConstructor
@AllArgsConstructor
public class UserSiteRoleId implements Serializable {

    private User user;
    private Site site;
    private Role role;
}

實體本身在 inf e 中工作如下。

@Entity
@Table(name = "user_site_roles", schema = "core")
@Data
@TypeDefs({
        @TypeDef(name = "pg-id-uuid", typeClass = PostgresIdUUIDType.class)
})
@IdClass(UserSiteRoleId.class)
public class UserSiteRole extends AuditCreated implements Serializable {

    @Id
    @ManyToOne
    @JoinColumn(name = "user_id", columnDefinition = "uuid", nullable = false)
    @Type(type = "pg-id-uuid")
    @OnDelete(action = OnDeleteAction.CASCADE)
    private User user;

    @Id
    @ManyToOne
    @JoinColumn(name = "site_id", columnDefinition = "uuid", nullable = false)
    @Type(type = "pg-id-uuid")
    @OnDelete(action = OnDeleteAction.CASCADE)
    private Site site;

    @Id
    @ManyToOne
    @JoinColumns({
            @JoinColumn(name = "role_id", referencedColumnName="id", columnDefinition = "uuid", insertable = false, updatable = false),
            @JoinColumn(name = "site_id", referencedColumnName="site_id", columnDefinition = "uuid", insertable = false, updatable = false)
    })
    @Type(type = "pg-id-uuid")
    @OnDelete(action = OnDeleteAction.CASCADE)
    private Role role;
}