Dear all:
I am trying to validate the fields upon update.
in the update method i created a query statement that checks if the a value is unique.
here is the update function
@IfInvalid(outcome = Outcome.REDISPLAY)
public String update() {
String compName = instance.getName();
String compTel = instance.getTel();
String compFax = instance.getFax();
int compId = instance.getId();
entityManager.refresh(instance);
if (compName.equals(instance.getName())) {
instance.setTel(compTel);
instance.setFax(compFax);
entityManager.flush();
refreshFinder();
return null;
}
else {
Query query1 = entityManager.createQuery("select comp from Companies comp where comp.name=:compName");
query1.setParameter("compName", compName);
if (query1.getResultList() != null) {
FacesContext.getCurrentInstance().addMessage(
null,
new FacesMessage(messages.get("Companies_name") + " "
+ messages.get("AlreadyExists")));
return null;
}
}
instance=(Companies)entityManager.find(Companies.class, compId);
instance.setName(compName);
instance.setTel(compTel);
instance.setFax(compFax);
entityManager.flush();
refreshFinder();
return null;
}If the user tries to enter a company name that already exists in the database then an error is reported. (works fine)
but if the user tries to enter a company name that doesnot exist in the database then an error is also reported. the problem is that in this case the query statement returns a list but it is not supposed to do so.
any one knows how to solve that.
Best regards
ama55
