Embeddable 类包含复合键生成太多列？

分类：编程问答

如何解决Embeddable 类包含复合键生成太多列？

我有两个类（UmowaEntity 和 MpkEntity）。我用两个双向 @OneToMany 关联替换了 @ManyToMany 关联，因为我需要额外的列（“aktywny”）。 MpkEntity 包含复合键（CompositeKey）。

MpkEntity：

@Entity
@Table(name = "mpk")
public class MpkEntity implements Serializable {

    private CompositeKey compositeKey;
    private String nazwaSkrocona;
    private Boolean aktywny = Boolean.TRUE;
    private Set<UmowaMpkEntity> umowy = new HashSet<>();

    public MpkEntity() {
    }

    @EmbeddedId
    public CompositeKey getCompositeKey() {
        return compositeKey;
    }

    public void setCompositeKey(CompositeKey compositeKey) {
        this.compositeKey = compositeKey;
    }

    @JsonView(ViewAlways.class)
    @Transient
    public Long getId() {
        return compositeKey.getId();
    }

    @Column(name = "nazwa_skrocona",nullable = false)
    @JsonView(ViewAlways.class)
    public String getNazwaSkrocona() {
        return nazwaSkrocona;
    }

    public void setNazwaSkrocona(String nazwaSkrocona) {
        this.nazwaSkrocona = nazwaSkrocona;
    }

    @OneToMany(fetch = FetchType.LAZY,mappedBy = "mpk",cascade = CascadeType.ALL)
    public Set<UmowaMpkEntity> getUmowy() {
        return umowy;
    }

    public void setUmowy(Set<UmowaMpkEntity> umowy) {
        this.umowy = umowy;
    }

    public Boolean getAktywny() {
        return aktywny;
    }

    public void setAktywny(Boolean aktywny) {
        this.aktywny = aktywny;
    }
}

Umowa 实体：

 @Entity
 @Table(name = "umowa")
 public class UmowaEntity implements Serializable {

    private Long id;
    private String numer;
    private String przedmiot;
    private Set<UmowaMpkEntity> mpki = new HashSet<>();

    public UmowaEntity() {
    }

    @Id
    @JsonView(ViewAlways.class)
    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    @Column(name = "numer",unique = true)
    @NotNull
    @JsonView(ViewAlways.class)
    public String getNumer() {
        return numer;
    }

    public void setNumer(String numer) {
        this.numer = numer;
    }

    @Column(name = "przedmiot")
    @NotNull
    @JsonView(ViewAlways.class)
    public String getPrzedmiot() {
        return przedmiot;
    }

    public void setPrzedmiot(String przedmiot) {
        this.przedmiot = przedmiot;
    }

   
    @OneToMany(fetch = FetchType.LAZY,mappedBy = "umowa",cascade = CascadeType.ALL)
    @JsonView(UmowaView.MainView.class)
    public Set<UmowaMpkEntity> getMpki() {
        return mpki;
    }

    public void setMpki(Set<UmowaMpkEntity> mpki) {
        this.mpki = mpki;
    }
}

复合键：

@Embeddable
public class CompositeKey implements Serializable {

    private static final long serialVersionUID = 1338879188344812866L;

    private Long id;
    private FirmaEntity firma;

    public CompositeKey() {
    }

    public CompositeKey(Long id,FirmaEntity firma) {
        this.id = id;
        this.firma = firma;
    }

    @JsonView(ViewAlways.class)
    @Column(insertable = true,updatable = false)
    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    @JsonView(ViewAlways.class)
    @ManyToOne
    @JoinColumn(name = "firma_id",nullable = false,insertable = true,updatable = false)
    public FirmaEntity getFirma() {
        return firma;
    }

    public void setFirma(FirmaEntity firma) {
        this.firma = firma;
    }

    @Override
    public int hashCode() {
        int hash = 5;
        hash = 67 * hash + Objects.hashCode(this.id);
        hash = 67 * hash + Objects.hashCode(this.firma);
        return hash;
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null) {
            return false;
        }
        if (!(obj instanceof CompositeKey)) {
            return false;
        }
        final CompositeKey other = (CompositeKey) obj;
        if (!Objects.equals(this.id,other.id)) {
            return false;
        }
        if (!Objects.equals(this.firma,other.firma)) {
            return false;
        }
        return true;
    }
 }

公司实体：

@Entity
@Table(name = "firma")
public class FirmaEntity extends BaseEntity {

    private static final long serialVersionUID = -4105296181552840561L;
    private Long id;
    private String nazwa;

    public FirmaEntity() {
    }

    public FirmaEntity(Long firmaId) {
        this.id = firmaId;
    }

    @Id
    @JsonView(ViewAlways.class)
    @Cacheable("firmy")
    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    @JsonView(ViewAlways.class)
    @Column(nullable = false)
    public String getNazwa() {
        return nazwa;
    }

    public void setNazwa(String nazwa) {
        this.nazwa = nazwa;
    }

    @Override
    public String toString() {
        return "FirmaEntity{" + "id=" + id + ",nazwa=" + nazwa + '}';
    }

    @Override
    public int hashCode() {
        int hash = 7;
        hash = 89 * hash + Objects.hashCode(this.id);
        return hash;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (!(obj instanceof FirmaEntity)) {
            return false;
        }
        final FirmaEntity other = (FirmaEntity) obj;
        if (!Objects.equals(this.id,other.id)) {
            return false;
        }
        return true;
    }
}

我尝试创建包含复合键的@Embeddable 类。我怀疑休眠会创建 4 列（aktywny、umowa_id (pk)、mpk_id (pk)、firma_id (pk)）但我收到了 6 列（id (pk)、aktywny、umowa_id (pk)、mpk_id、firma_id (pk),mpk_firma_id)。现在，当我尝试插入 UmowaMpkEntity 时，我得到了 UmowaMpkEntity 错误：列“id”中的空值违反了非空约束：由于列“id”，失败的行包含 (null,t,131,null,null)。>

enter image description here

UmowaMpkEntity：

@Entity
@Table(name = "umowa_mpk")
public class UmowaMpkEntity implements Serializable {

    private UmowaMpkId pk = new UmowaMpkId();
    private Boolean aktywny = Boolean.TRUE;
    private UmowaEntity umowa;
    private MpkEntity mpk;
    private FirmaEntity firma;

    public UmowaMpkEntity() {
    }

    @EmbeddedId
    public UmowaMpkId getPk() {
        return pk;
    }

    public void setPk(UmowaMpkId pk) {
        this.pk = pk;
    }

    @JsonView(UmowaView.MainView.class)
    public Boolean getAktywny() {
        return aktywny;
    }

    public void setAktywny(Boolean aktywny) {
        this.aktywny = aktywny;
    }

    @ManyToOne(fetch = FetchType.LAZY)
    @MapsId("umowaId")
    public UmowaEntity getUmowa() {
        return umowa;
    }

    public void setUmowa(UmowaEntity umowa) {
        this.umowa = umowa;
    }

    @ManyToOne(fetch = FetchType.LAZY)
    @MapsId("compositeKey.id")
    @JsonView(UmowaView.MainView.class)
    public MpkEntity getMpk() {
        return mpk;
    }

    public void setMpk(MpkEntity mpk) {
        this.mpk = mpk;
    }

    @ManyToOne(fetch = FetchType.LAZY)
    @MapsId("compositeKey.firma.id")
    @JsonView(UmowaView.MainView.class)
    public FirmaEntity getFirma() {
        return firma;
    }

    public void setFirma(FirmaEntity firma) {
        this.firma = firma;
    }
    
    

    @Override
    public int hashCode() {
        int hash = 5;
        hash = 89 * hash + Objects.hashCode(this.umowa.getId());
        hash = 89 * hash + Objects.hashCode(this.mpk.getCompositeKey().getId());
        return hash;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        final UmowaMpkEntity other = (UmowaMpkEntity) obj;
        if (!Objects.equals(this.umowa.getId(),other.umowa.getId())) {
            return false;
        }
        if (!Objects.equals(this.mpk.getCompositeKey().getId(),other.mpk.getCompositeKey().getId())) {
            return false;
        }
        return true;
    }
}

UmowaMpkId：

@Embeddable
public class UmowaMpkId implements Serializable {

    private Long umowaId;
    private CompositeKey compositeKey;

    public UmowaMpkId() {
    }

    @Column(name = "umowa_id")
    public Long getUmowaId() {
        return umowaId;
    }

    public void setUmowaId(Long umowaId) {
        this.umowaId = umowaId;
    }

    public CompositeKey getCompositeKey() {
        return compositeKey;
    }

    public void setCompositeKey(CompositeKey compositeKey) {
        this.compositeKey = compositeKey;
    }

    @Override
    public int hashCode() {
        int hash = 7;
        hash = 41 * hash + Objects.hashCode(this.umowaId);
        hash = 41 * hash + Objects.hashCode(this.compositeKey);
        return hash;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        final UmowaMpkId other = (UmowaMpkId) obj;
        if (!Objects.equals(this.umowaId,other.umowaId)) {
            return false;
        }
        if (!Objects.equals(this.compositeKey,other.compositeKey)) {
            return false;
        }
        return true;
    }
}

解决方法

我猜 UnowaMpkEntity 的 @MapsId 有问题。应该是这样的

@Entity
@Table(name = "umowa_mpk")
public class UmowaMpkEntity implements Serializable {
 @ManyToOne(fetch = FetchType.LAZY)
    @MapsId("compositeKey") // without id,as MpkEntity has it as its PK
    @JsonView(UmowaView.MainView.class)
    public MpkEntity getMpk() {
        return mpk;
    }

    @ManyToOne(fetch = FetchType.LAZY)
    @MapsId("compositeKey.firma") // without id,as compositeKey.firma is already referenced to it
    @JsonView(UmowaView.MainView.class)
    public FirmaEntity getFirma() {
        return firma;
    }
}

看看@MapsId documentation

附言考虑为您的课程使用英文名称

P.P.S.考虑使用 Lombok 为简洁

,

我建议您不要在复合 ID 中使用关联，而应仅将它们映射到实体中。试试这个：

@Entity
@Table(name = "mpk")
public class MpkEntity implements Serializable {

    private CompositeKey compositeKey;
    private FirmaEntity firma;
    private String nazwaSkrocona;
    private Boolean aktywny = Boolean.TRUE;
    private Set<UmowaMpkEntity> umowy = new HashSet<>();

    public MpkEntity() {
    }

    @EmbeddedId
    public CompositeKey getCompositeKey() {
        return compositeKey;
    }

    public void setCompositeKey(CompositeKey compositeKey) {
        this.compositeKey = compositeKey;
    }
    
    @JsonView(ViewAlways.class)
    @ManyToOne
    @JoinColumn(name = "firma_id",nullable = false,insertable = false,updatable = false)
    public FirmaEntity getFirma() {
        return firma;
    }

    public void setFirma(FirmaEntity firma) {
        this.firma = firma;
    }


    @JsonView(ViewAlways.class)
    @Transient
    public Long getId() {
        return compositeKey.getId();
    }

    @Column(name = "nazwa_skrocona",nullable = false)
    @JsonView(ViewAlways.class)
    public String getNazwaSkrocona() {
        return nazwaSkrocona;
    }

    public void setNazwaSkrocona(String nazwaSkrocona) {
        this.nazwaSkrocona = nazwaSkrocona;
    }

    @OneToMany(fetch = FetchType.LAZY,mappedBy = "mpk",cascade = CascadeType.ALL)
    public Set<UmowaMpkEntity> getUmowy() {
        return umowy;
    }

    public void setUmowy(Set<UmowaMpkEntity> umowy) {
        this.umowy = umowy;
    }

    public Boolean getAktywny() {
        return aktywny;
    }

    public void setAktywny(Boolean aktywny) {
        this.aktywny = aktywny;
    }
}

@Embeddable
public class CompositeKey implements Serializable {

    private static final long serialVersionUID = 1338879188344812866L;

    private Long id;
    private Long firmaId;

    public CompositeKey() {
    }

    public CompositeKey(Long id,FirmaEntity firma) {
        this.id = id;
        this.firmaId = firma.getId();
    }

    @JsonView(ViewAlways.class)
    @Column(insertable = true,updatable = false)
    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    @JsonView(ViewAlways.class)
    @ManyToOne
    @Column(name = "firma_id",insertable = true,updatable = false)
    public Long getFirmaId() {
        return firmaId;
    }

    public void setFirmaId(Long firmaId) {
        this.firmaId = firmaId;
    }

    @Override
    public int hashCode() {
        int hash = 5;
        hash = 67 * hash + Objects.hashCode(this.id);
        hash = 67 * hash + Objects.hashCode(this.firmaId);
        return hash;
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null) {
            return false;
        }
        if (!(obj instanceof CompositeKey)) {
            return false;
        }
        final CompositeKey other = (CompositeKey) obj;
        if (!Objects.equals(this.id,other.id)) {
            return false;
        }
        if (!Objects.equals(this.firmaId,other.firmaId)) {
            return false;
        }
        return true;
    }
 }
 
 @Entity
 @Table(name = "umowa")
 public class UmowaEntity implements Serializable {

    private Long id;
    private String numer;
    private String przedmiot;
    private Set<UmowaMpkEntity> mpki = new HashSet<>();

    public UmowaEntity() {
    }

    @Id
    @JsonView(ViewAlways.class)
    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    @Column(name = "numer",unique = true)
    @NotNull
    @JsonView(ViewAlways.class)
    public String getNumer() {
        return numer;
    }

    public void setNumer(String numer) {
        this.numer = numer;
    }

    @Column(name = "przedmiot")
    @NotNull
    @JsonView(ViewAlways.class)
    public String getPrzedmiot() {
        return przedmiot;
    }

    public void setPrzedmiot(String przedmiot) {
        this.przedmiot = przedmiot;
    }

   
    @OneToMany(fetch = FetchType.LAZY,mappedBy = "umowa",cascade = CascadeType.ALL)
    @JsonView(UmowaView.MainView.class)
    public Set<UmowaMpkEntity> getMpki() {
        return mpki;
    }

    public void setMpki(Set<UmowaMpkEntity> mpki) {
        this.mpki = mpki;
    }
}
 
 @Entity
@Table(name = "firma")
public class FirmaEntity extends BaseEntity {

    private static final long serialVersionUID = -4105296181552840561L;
    private Long id;
    private String nazwa;

    public FirmaEntity() {
    }

    public FirmaEntity(Long firmaId) {
        this.id = firmaId;
    }

    @Id
    @JsonView(ViewAlways.class)
    @Cacheable("firmy")
    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    @JsonView(ViewAlways.class)
    @Column(nullable = false)
    public String getNazwa() {
        return nazwa;
    }

    public void setNazwa(String nazwa) {
        this.nazwa = nazwa;
    }

    @Override
    public String toString() {
        return "FirmaEntity{" + "id=" + id + ",nazwa=" + nazwa + '}';
    }

    @Override
    public int hashCode() {
        int hash = 7;
        hash = 89 * hash + Objects.hashCode(this.id);
        return hash;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (!(obj instanceof FirmaEntity)) {
            return false;
        }
        final FirmaEntity other = (FirmaEntity) obj;
        if (!Objects.equals(this.id,other.id)) {
            return false;
        }
        return true;
    }
}

@Entity
@Table(name = "umowa_mpk")
public class UmowaMpkEntity implements Serializable {

    private UmowaMpkId pk = new UmowaMpkId();
    private Boolean aktywny = Boolean.TRUE;
    private UmowaEntity umowa;
    private MpkEntity mpk;
    private FirmaEntity firma;

    public UmowaMpkEntity() {
    }

    @EmbeddedId
    public UmowaMpkId getPk() {
        return pk;
    }

    public void setPk(UmowaMpkId pk) {
        this.pk = pk;
    }

    @JsonView(UmowaView.MainView.class)
    public Boolean getAktywny() {
        return aktywny;
    }

    public void setAktywny(Boolean aktywny) {
        this.aktywny = aktywny;
    }

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "umowa_id",updatable = false)
    public UmowaEntity getUmowa() {
        return umowa;
    }

    public void setUmowa(UmowaEntity umowa) {
        this.umowa = umowa;
    }

    @ManyToOne(fetch = FetchType.LAZY)
    @JsonView(UmowaView.MainView.class)
    @JoinColumn(name = "mpk_id",updatable = false)
    public MpkEntity getMpk() {
        return mpk;
    }

    public void setMpk(MpkEntity mpk) {
        this.mpk = mpk;
    }

    @ManyToOne(fetch = FetchType.LAZY)
    @JsonView(UmowaView.MainView.class)
    @JoinColumn(name = "firma_id",updatable = false)
    public FirmaEntity getFirma() {
        return firma;
    }

    public void setFirma(FirmaEntity firma) {
        this.firma = firma;
    }
    
    

    @Override
    public int hashCode() {
        int hash = 5;
        hash = 89 * hash + Objects.hashCode(this.umowa.getId());
        hash = 89 * hash + Objects.hashCode(this.mpk.getCompositeKey().getId());
        return hash;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        final UmowaMpkEntity other = (UmowaMpkEntity) obj;
        if (!Objects.equals(this.umowa.getId(),other.umowa.getId())) {
            return false;
        }
        if (!Objects.equals(this.mpk.getCompositeKey().getId(),other.mpk.getCompositeKey().getId())) {
            return false;
        }
        return true;
    }
}

@Embeddable
public class UmowaMpkId implements Serializable {

    private Long umowaId;
    private CompositeKey compositeKey;

    public UmowaMpkId() {
    }

    @Column(name = "umowa_id")
    public Long getUmowaId() {
        return umowaId;
    }

    public void setUmowaId(Long umowaId) {
        this.umowaId = umowaId;
    }

    @Embedded
    public CompositeKey getCompositeKey() {
        return compositeKey;
    }

    public void setCompositeKey(CompositeKey compositeKey) {
        this.compositeKey = compositeKey;
    }

    @Override
    public int hashCode() {
        int hash = 7;
        hash = 41 * hash + Objects.hashCode(this.umowaId);
        hash = 41 * hash + Objects.hashCode(this.compositeKey);
        return hash;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        final UmowaMpkId other = (UmowaMpkId) obj;
        if (!Objects.equals(this.umowaId,other.umowaId)) {
            return false;
        }
        if (!Objects.equals(this.compositeKey,other.compositeKey)) {
            return false;
        }
        return true;
    }
}

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错误1：运行项目后报如下错误 解决方案 报错2：Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile (default-compile) on project sb 解决方案：在pom.
springmvc拦截器中使用redisTemplate报空指针异常
参考 错误原因 过滤器或拦截器在生效时，redisTemplate还没有注入 解决方案：在注入容器时就生效 @Component //项目运行时就注入Spring容器 public class RedisBean { @Resource private RedisTemplate&lt;String
vite报错：npm ERR! command C:WINDOWSsystem32cmd.exe /d /s /c C:UsersychenAppDataLocalTempnpx-dde1c848.cmd
使用vite构建项目报错 C:\Users\ychen\work&gt;npm init @vitejs/app @vitejs/create-app is deprecated, use npm init vite instead C:\Users\ychen\AppData\Local\npm-
VM VirtualBox中安装centos时报错：设置基础软件仓库时出错
参考1 参考2 解决方案 # 点击安装源 协议选择 http:// 路径填写 mirrors.aliyun.com/centos/8.3.2011/BaseOS/x86_64/os URL类型 软件库URL 其他路径 # 版本 7 mirrors.aliyun.com/centos/7/os/x86
kafka常见问题
报错1 [root@slave1 data_mocker]# kafka-console-consumer.sh --bootstrap-server slave1:9092 --topic topic_db [2023-12-19 18:31:12,770] WARN [Consumer clie
hive常见问题
错误1 # 重写数据 hive (edu)&gt; insert overwrite table dwd_trade_cart_add_inc &gt; select data.id, &gt; data.user_id, &gt; data.course_id, &gt; date_format(
装载数据时报错：Failed to execute spark task, with exception 'org.apache.hadoop.hive.ql.metadata.HiveException(Failed to create spark client.)'
错误1 hive (edu)&gt; insert into huanhuan values(1,&#39;haoge&#39;); Query ID = root_20240110071417_fe1517ad-3607-41f4-bdcf-d00b98ac443e Total jobs = 1
flume常见问题
报错1：执行到如下就不执行了，没有显示Successfully registered new MBean. [root@slave1 bin]# /usr/local/software/flume-1.9.0/bin/flume-ng agent -n a1 -c /usr/local/softwa
hadoop集群常见错误
虚拟及没有启动任何服务器查看jps会显示jps，如果没有显示任何东西 [root@slave2 ~]# jps 9647 Jps 解决方案 # 进入/tmp查看 [root@slave1 dfs]# cd /tmp [root@slave1 tmp]# ll 总用量 48 drwxr-xr-x. 2
hive常见错误
报错1 hive&gt; show databases; OK Failed with exception java.io.IOException:java.lang.RuntimeException: Error in configuring object Time taken: 0.474 se
Linux常见错误
报错1 [root@localhost ~]# vim -bash: vim: 未找到命令 安装vim yum -y install vim* # 查看是否安装成功 [root@hadoop01 hadoop]# rpm -qa |grep vim vim-X11-7.4.629-8.el7_9.x
使用sqoop一直卡在：mapreduce.Job: Running job: job_1703173956074_0001
修改hadoop配置 vi /usr/local/software/hadoop-2.9.2/etc/hadoop/yarn-site.xml # 添加如下 &lt;configuration&gt; &lt;property&gt; &lt;name&gt;yarn.nodemanager.res
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