I am using hibernate and spring and I find the this question:

I have a class -> Batch

@Entity
@org.hibernate.annotations.Entity(mutable=false)
@Table(name="batch")
public class Batch {

private Long identifier;
private Person sellerParty;
...
@SequenceGenerator( // It only takes effect for
name="BatchIdGenerator", // databases providing identifier
sequenceName="BatchSeq") // generators.
@Id
@GeneratedValue(strategy=GenerationType.AUTO,
generator="BatchIdGenerator")
/**
* @return the identifier
*/
public Long getIdentifier() {
return identifier;
}

/**
* @param identifier the identifier to set
*/
public void setIdentifier(Long identifier) {
this.identifier = identifier;
}
...
/**
* @return the sellerParty
*/
@OneToOne(cascade=CascadeType.ALL)
@JoinColumn(name="seller_id")
public Person getSellerParty() {
return sellerParty;
}

/**
* @param sellerParty the sellerParty to set
*/
public void setSellerParty(Person sellerParty) {
this.sellerParty = sellerParty;
}
...
package es.corunet.facturgal.model.person;

and the class -> Person...

@Entity
@Table(name = "person")
@Inheritance(strategy=InheritanceType.SINGLE_TABLE)
public class Person {

private Long identifier;
private String personTypeCode;

...

@SequenceGenerator( // It only takes effect for
name="PersonIdGenerator", // databases providing identifier
sequenceName="PersonSeq") // generators.
@Id
@GeneratedValue(strategy=GenerationType.AUTO,
generator="PersonIdGenerator")
/**
* @return the identifier
*/
public Long getIdentifier() {
return identifier;
}

/**
* @param identifier the identifier to set
*/
public void setIdentifier(Long identifier) {
this.identifier = identifier;
}

...

/**
* @return the personTypeCode
*/
public String getPersonTypeCode() {
return personTypeCode;
}


/**
* @param personTypeCode the personTypeCode to set
*/
public void setPersonTypeCode(String personTypeCode) {
this.personTypeCode = personTypeCode;
}

I have BatchDaoHibernate y PersonDaoHibernate class that extend GenericDaoHibernate with the method

public void create(E entity) {
getSession().persist(entity);
}

Can I do that my aplication calls create if a person whith the same PersonTypeCode exists does not create a new person and use the old?

Thanks

Thanks