How to Catch Unique Constraint in Exception

Hi,
I am writing a trigger TR_EMP on a table EMP which has columns EMP_ID, EMP_NAME, ALT_EMP_ID.
Now I am updating ALT_EMP_ID for an EMP_ID(PK) which is unique.
If ALT_EMP_ID is null
then
:new.ALT_EMP_ID = l_alt_emp_id;
end if;As this ALT_EMP_ID is unique, same ID shouldn't be inserted again here. When data being inserted with 2 different sessions for 2 different EMP_ID there is a possible chance of inserting same ALT_EMP_ID for both which results in Unique error. I need to handle this exception. DUP_VAL_ON_INDEX or OTHERS Execption not able to handle this.
Can you help me out on how to handle such exception?

>
jeneesh wrote:
I am able to use dup_val_on_index
>
Can you please write an Exception for this query?
If ALT_EMP_ID is null
then
:new.ALT_EMP_ID = l_alt_emp_id;
end if;jeneesh wrote:
Moreover, what is your requirement? This design seems to be flawed. If you can explain teh actual requirement, forum members will be able to help you better..
>
Alternate Emp ID will be populated for Every employee. If on a same session when this ID is populated for 2 different Emplyoees then it will throw Unique constraint error, which should be handled.

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Table created.
SQL> set serverout on
SQL> declare
2   ex exception;
3   pragma exception_init(ex,-1);
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Message was edited by:
53637

Check out following
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How to Catch Unique Constraint in Exception

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