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这里是Hibernate的新手，所以可能是因为我误解和/或在某个地方犯了错误。Hibernate生成新的Id而不是从数据库获取Id？
最近，我在独立的Java应用程序中实现了Hibernate。我有一个复杂的数据库结构，有很多关联，还有一个超级子类构造，每个表都有自己的表。问题如下：
当我要求Hibernate从其中一个子类表中选择几行时，我得到的每行ID与数据库中的不一样。当我想在其他地方使用此Id（获取外键违规）时，会导致很多问题。尽管我无法在数据库中的任何位置找到Id，但在同一张表中或其他位置中，Id始终与该特定行相同。
我的Hibernate映射为超/子如下：
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="bliksem_prototype.model.Endpoint" table="Bliksem_Endpoint" schema="dbo" catalog="WMB_Application_Operations_ONTW" optimistic-lock="version">
<id name="endpointId">
<column name="EndpointId" length="36" />
<generator class="uuid2" />
</id>
<property name="endpointType" type="string">
<column name="EndpointType" length="30" not-null="true" />
</property>
<set name="endpointFlows" table="Bliksem_Link_Endpoint_Flow" inverse="true" lazy="true" fetch="select">
<key>
<column name="EndpointId" length="36" not-null="true" />
</key>
<one-to-many class="bliksem_prototype.model.EndpointFlow" />
</set>
<joined-subclass name="bliksem_prototype.model.Queue" table="Bliksem_Queue" schema="dbo" catalog="WMB_Application_Operations_ONTW" extends="bliksem_prototype.model.Endpoint">
<key column="QueueId"/>
<many-to-one name="cluster" class="bliksem_prototype.model.Cluster" fetch="select">
<column name="ClusterName" length="30" />
</many-to-one>
<many-to-one name="queueManager" class="bliksem_prototype.model.QueueManager" fetch="select">
<column name="QueueManagerName" length="30" not-null="true" />
</many-to-one>
<property name="queueName" type="string">
<column name="QueueName" length="70" not-null="true" />
</property>
<property name="queueType" type="string">
<column name="QueueType" length="30" not-null="true" />
</property>
<property name="maxDepth" type="java.lang.Long">
<column name="MaxDepth" precision="10" scale="0" />
</property>
<property name="maxMessageLength" type="java.lang.Long">
<column name="MaxMessageLength" precision="15" scale="0" />
</property>
<set name="queueDestinationRouters" table="Bliksem_Link_Queue_DestinationRouter" inverse="true" lazy="true" fetch="select">
<key>
<column name="QueueId" length="36" not-null="true" />
</key>
<one-to-many class="bliksem_prototype.model.QueueDestinationRouter" />
</set>
</joined-subclass>
<joined-subclass name="bliksem_prototype.model.FileNode" table="Bliksem_FileNode" schema="dbo" catalog="WMB_Application_Operations_ONTW" extends="bliksem_prototype.model.Endpoint">
<key column="FileNodeId"/>
<property name="fileNodeName" type="string">
<column name="FileNodeName" length="70" not-null="true" />
</property>
<property name="mapName" type="string">
<column name="MapName" length="70" />
</property>
</joined-subclass>
<joined-subclass name="bliksem_prototype.model.Webservice" table="Bliksem_Webservice" schema="dbo" catalog="WMB_Application_Operations_ONTW" extends="bliksem_prototype.model.Endpoint">
<key column="WebserviceId"/>
<property name="webserviceName" type="string">
<column name="WebserviceName" length="70" not-null="true" />
</property>
</joined-subclass>
</class>
</hibernate-mapping>
如果我改变generator class到assigned并分配UUID我自己，我仍然得到了同样的问题。
子类的一个实例：
public class FileNode extends Endpoint implements java.io.Serializable, Comparable<FileNode> {
private String fileNodeName;
private String mapName;
public FileNode() {
}
public FileNode(UUID fileNodeId, String fileNodeName, String mapName) {
super(fileNodeId, "FileNode");
this.fileNodeName = fileNodeName;
this.mapName = mapName;
}
public FileNode(UUID fileNodeId, String fileNodeName) {
super(fileNodeId, "FileNode");
this.fileNodeName = fileNodeName;
}
public String getFileNodeName() {
return this.fileNodeName;
}
public void setFileNodeName(String fileNodeName) {
this.fileNodeName = fileNodeName;
}
public String getMapName() {
return this.mapName;
}
public void setMapName(String mapName) {
this.mapName = mapName;
}
@Override
public int compareTo(FileNode o) {
return this.getFileNodeName().compareTo(o.getFileNodeName());
}
}
超类：
public class Endpoint implements java.io.Serializable {
private UUID endpointId;
private String endpointType;
private Set endpointFlows = new HashSet(0);
@Transient
private String environmentName;
public Endpoint() {
}
public Endpoint(UUID endpointId, String endpointType, Set endpointFlows) {
this.endpointId = endpointId;
this.endpointType = endpointType;
this.endpointFlows = endpointFlows;
}
public Endpoint(UUID endpointId, String endpointType) {
this.endpointId = endpointId;
this.endpointType = endpointType;
}
public Endpoint(UUID endpointId, String endpointType, String environmentName) {
this.endpointId = endpointId;
this.endpointType = endpointType;
this.environmentName = environmentName;
}
public UUID getEndpointId() {
return endpointId;
}
public void setEndpointId(UUID endpointId) {
this.endpointId = endpointId;
}
public String getEndpointType() {
return this.endpointType;
}
public void setEndpointType(String endpointType) {
this.endpointType = endpointType;
}
public String getEnvironmentName() {
return environmentName;
}
public void setEnvironmentName(String environmentName) {
this.environmentName = environmentName;
}
public Set getEndpointFlows() {
return endpointFlows;
}
public void setEndpointFlows(Set endpointFlows) {
this.endpointFlows = endpointFlows;
}
}
插入的一个子类作品完美，我没有要插入的自动进入超。 注意：我不完全确定，如果我的问题只是因为超级/子类的构造，但这是我第一次遇到一些问题。
我错过了什么或没有正确理解关于Hibernate的知识？
更正：我有一个随机的不同表的问题，它没有超/子类的构造。 – Century