Duplicate item checking failed in Form level-urgent

Question

Hi all
i have creation page with advanced table
i need to restrict the duplication at form level as well as save button
in some cases the validation is failed
if ("CodeValidation".equals(pageContext.getParameter(EVENT_PARAM)))
itemcode = vo.getCurrentRow().getAttribute("ItemCode").toString();//advanced table multiple records come
am.xxItemCodeValidation(itemcode);//checking the item validation at databse level
am.xxdupitemcode(itemcode);
method in am
public void xxdupitemcode(String itemcode)
System.out.println("The item code is.........."+itemcode);
int count = 0;
xxcrmNewItemVOImpl vo = getxxcrmNewItemVO1();
vo.executeQuery();
System.out.println("the row are" + vo.getAllRowsInRange().length);
Row r[] = vo.getAllRowsInRange();
int n = vo.getAllRowsInRange().length;
for (int i = 0; i < n; i++)
System.out.println("entered into this block......for loop" + count);
if (itemcode.equals(r.getAttribute("ItemCode")))
System.out.println("entered into this block......" + count);
count = count + 1;
System.out.println("the count is........."+count);
if (count > 1)
throw new OAException("Duplicate Item found plz change the item",
OAException.ERROR);
} else
System.out.println("Exception block....... ");
in save button i am calling
if ("Save".equals(pageContext.getParameter(EVENT_PARAM)))
am.xxdupitemcode(itemcode);
am.invokeMethod("xxsavetr");
in which case it is failing is
in first row user enter
ROW-ITEMCODE
1-A
2-A
3-B
4-B
in second row and 4 th row exception is raised but user didnt change the itemcode and proceed for next steps
IN SAVE BUTTON EXCEPTION IS RAISED
but user will go to 4 th row and B should be change as C and click on save
records are saving with duplication item of A
but i need to restrict in save button also
how its posible
Regards
Sreekanth

Answer 1

Sreekanth,
The correct way to check for duplicates is to check it both in the VO/EO cache as well as the database. It is possible the user entered duplicate value in the current session. In that case you should first check within the existing VO rows if the values are duplicated or not (in case all the database rows are already queried, you might not need to run an explicit query, otherwise another validation VO needs to be executed to check for duplicates).
Regards
Sumit