连接表中一个实体扩展另一个实体的列不允许为null

Question

我有一个实体VCenterDistributedVirtualPortgroup，它扩展了VCenterNetwork，两个实体在实体VCenterFolder中处于OneToMany关系中。我得到以下错误：

@Entity
@Embeddable
@Table(name="network")
@DiscriminatorColumn(name="discriminator")
@DiscriminatorValue("Network")
public class VCenterNetwork
{
    @Transient
    private Network network;

    @Transient
    private static Map<MOR, VCenterNetwork> networkMap = new TreeMap<MOR, VCenterNetwork>();

    @EmbeddedId
    private MOR id;
    public MOR getId() {return this.id;}
    public void setId(MOR id) {this.id = id;}
    ...
}

@Entity
@Table(name="distributedvirtualportgroup")
@DiscriminatorColumn(name="discriminator")
@DiscriminatorValue("DistributedVirtualPortgroup")
public class VCenterDistributedVirtualPortgroup extends VCenterNetwork
{
    @Transient
    private DistributedVirtualPortgroup distributedVirtualPortgroup;

    @Transient
    private static Map<MOR, VCenterDistributedVirtualPortgroup> distributedVirtualPortgroupMap = new TreeMap<MOR, VCenterDistributedVirtualPortgroup>();
    ...
}

@Entity
@Table(name="folder")
public class VCenterFolder
{
    @Transient
    private Folder folder;

    @Transient
    private static Map<MOR, VCenterFolder> folderMap = new TreeMap<MOR, VCenterFolder>();

    @EmbeddedId
    private MOR id;
    public MOR getId() {return this.id;}
    public void setId(MOR id) {this.id = id;}

    @Embedded
    @OneToMany(cascade=CascadeType.ALL)
    private List<VCenterNetwork> network = new ArrayList<VCenterNetwork>();
    public List<VCenterNetwork> getNetwork() {return this.network;}
    public void getvirtualNetwork(List<VCenterNetwork> network) {this.network = network;}

    @Embedded
    @OneToMany(cascade=CascadeType.ALL)
    private List<VCenterDistributedVirtualPortgroup> distributedVirtualPortgroups = new ArrayList<VCenterDistributedVirtualPortgroup>();
    public List<VCenterDistributedVirtualPortgroup> getDistributedVirtualPortgroups() {return this.distributedVirtualPortgroups;}
    public void setDistributedVirtualPortgroups(List<VCenterDistributedVirtualPortgroup> distributedVirtualPortgroups){this.distributedVirtualPortgroups = distributedVirtualPortgroups;}
    ....
}

FOLDER_NETWORK
    FOLDER_TYPE - VARCHAR(255) NOT NULL
    FOLDER_VAL - VARCHAR(255) NOT NULL
    NETWORK_TYPE - VARCHAR(255) NOT NULL
    NETWORK_VAL - VARCHAR(255) NOT NULL
    DISTRIBUTEDVIRTUALPORTGROUP_TYPE - VARCHAR(255) NOT NULL
    DISTRIBUTEDVIRTUALPORTGROUP_TYPE - VARCHAR(255) NOT NULL

Answer 1

MOR的成员类型是&val，因此是联接表中的名称。

我通过在network和distributedVirtualPortgroups字段中添加folloing JoinTable来解决这个问题：

    @JoinTable
    (
            name="FOLDER_NETWORK",
            joinColumns= {@JoinColumn(name="TYPE", referencedColumnName="TYPE"), @JoinColumn(name="VAL", referencedColumnName="VAL")},
            inverseJoinColumns= {@JoinColumn(name="NETWORK_TYPE", referencedColumnName="TYPE"), @JoinColumn(name="NETWORK_VAL", referencedColumnName="VAL")}
    )