The problem is: We have a large application, and 99.9% of time, the automatic ID generation works perfectly; recently, though, we had to implement an application that pulls data from another application through a webservice and saves it to the local database. Both use exactly the same persistent classes. I need the client application to locally store data pulled from the server with no modification, not even ID's. The problem is: no matter what you do, during inclusion Hibernate is simply generating a brand new ID, no questions asked.
Is there any way to tell Hibernate to sometimes, just sometimes, skip the ID generation during an inclusion and just use whatever ID the object currently has?
For reference, this is the base persistent class:
Code:
/**
* Classe base das classes persistentes do sistema.
*
* @author Haroldo
*/
@MappedSuperclass
public abstract class PersistentImpl implements Persistent, Comparable {
private Long id;
private Date version;
/**
* @see com.ats.framework.pojo.Persistent#getId()
*/
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
public Long getId() {
return this.id;
}
/**
* @see com.ats.framework.pojo.Persistent#setId(java.lang.Long)
*/
public void setId(Long id) {
this.id = id;
}
/**
* Data/hora/minuto/segundo/milésimo da última modificação.<br>
* Usado para implementação do lock otimista.
*
* @see com.ats.framework.model.pojo.Persistent#getVersion()
*/
@Version
@Column(nullable=false)
@Temporal(TemporalType.TIMESTAMP)
public Date getVersion() {
return version;
}
/**
* @see com.ats.framework.model.pojo.Persistent#setVersion(java.util.Date)
*/
public void setVersion(Date version) {
this.version = version;
}
/**
* Necessário para comportar-se corretamente quando incluído
* dentro de um Set.
*
* @see java.lang.Object#equals(java.lang.Object)
*/
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if ((obj != null) && (obj instanceof Persistent) &&
(this.getId() != null) && (((Persistent)obj).getId() != null)) {
return this.getId().equals(((Persistent)obj).getId());
}
return false;
}
public int compareTo(Object o) {
if (this.equals(o)) {
return 0;
}
if ((o != null) && (o instanceof Persistent) &&
(this.getId() != null) && (((Persistent)o).getId() != null)) {
return this.getId().compareTo(((Persistent)o).getId());
}
return 0;
}
/**
* Necessário para comportamento correto dentro de HashSet e HashMap.
*
* @see java.lang.Object#hashCode()
*/
public int hashCode() {
if (this.getId() == null) {
return 0;
}
return this.getId().hashCode();
}
/**
* Apenas para depuração.
*
* @see java.lang.Object#toString()
*/
public String toString() {
StringBuffer sb = new StringBuffer(super.toString());
sb.append(" id=").append(this.getId());
return sb.toString();
}
}
And this is the class I'm currently using for the tests:
Code:
/**
* Classe de Persistência do Pais
*
* @author Mauricio Monteiro
*/
@Entity
public class Pais extends CadastroBase {
private Collection<Estado> estados;
/**
* @return Returns the estados.
*/
@OneToMany(fetch=FetchType.LAZY, mappedBy="pais")
@OrderBy("uf")
@XmlTransient
public Collection<Estado> getEstados() {
return this.estados;
}
/**
* @param estados The estados to set.
*/
public void setEstados(Collection<Estado> estados) {
this.estados = estados;
}
}
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