Validate duplicate data entry by user on form

On a form I have a block, in the block I have 3 fields. On block level on 'when-validate-record' I am trying to write a trigger. what I am trying to do is the following:-
If the user enters 'abcd' in the field... it's o.k
then he moves on to enter another record without saving the first record and enters 'abcd' again in the same field. (means the data is not saved in the table yet)
I want to pop up a message here and tell the user that he has entered the same data before in one of the records and he cannot do it again.
The trigger should be able to scan for all the records in the block and see if the data he is entering has been entered before on the form. I also have to check wether the data does not exist in the table as well.
that means I have to validate that 'abcd' should not be in the table and also 'abcd' should not be on the form as entered by the user.
Does anyone know what to do? this is what I am doing but it does not work?
v_orig_position := :system.trigger_record;
v_tax_id := :SITE_BLK.TAX_ID;
first_record;
loop
if v_tax_id = :SITE_BLK.TAX_ID and :SITE_BLK.TAX_AUTHORITY
= 'WSBC' THEN
v_taxid_count := v_taxid_count + 1;
end if;
if (:system.last_record = 'TRUE') then
go_record(v_orig_position);
EXIT;
else
next_record;
end if;
end loop;
IF v_taxid_count > 1 THEN
FND_MESSAGE.SET_STRING(NVL(:site_blk.tax_id,'notaxid') ||' id already entered! ');
FND_MESSAGE.SHOW;
RAISE FORM_TRIGGER_FAILURE;
eND IF;
it gives me error message 'illegal restiction first_record' and the logic does not work..

Are you sure you're on the right forum? As far as I understood you are working with Oracle forms, and if you do not save the 1st row into Oracle DB ("means the data is not saved in the table yet"), then it's the buisiness of your client how to validate duplicates.
I also have to check wether the data does not exist in the table as well. UNIQUE constraint is the straightforward solution in 99.99% of the cases
As for your trigger logic try
Forms
Cheers

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Check duplicate data entry in multi record block,which is a mandatory field

Dear all,
I have a situation where i have to check duplicate data entry(on a particular field,which is a mandatory field,i.e. it cannot be skipped by user without entering value) while data key-in in a Multi Record block.
As for reference I have used a logic,such as
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as this trigger fire every time as soon as i leave that record,so its assigning the value of that current time.And this process continues
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Please give me a meaningful logic or code for solving this problem
Any other logic to solve this problem is also welcome

@Ammad Ahmed
first of all thanks .your logic worked,but still i have some little bit of problem,
now the requirement is a master detail form where both master and detail is multirecord ,where detail cannot have duplicate record,
such as..........
MASTER:--
A code
A1
A2
DETAIL:--
D code
d1
d2 <-valid as for master A1 , detail d1 ,d2 are not duplicate
d2 <--invalid as as for master A1 , detail d2 ,d2 are duplicate
validation rule: A Code –D Code combination is unique. The system will stop users from entering duplicate D Code for a A Code. Appropriate error message will be displayed.*
actually i am facing a typical problem,the same logic i have been applied in detail section ,its working fine when i am inserting new records.problem starts when i query,after query in ' a ' field say 2 records (i.e. which has been earlier saved) has been pasted,now if i insert a new record with the value exactly same with the already present value in the screen(i.e. value populated after query) its not showing duplicate.................could u tell me the reason?and help me out...............its urgent plzzzzzzzzz
Edited by: sushovan on Nov 22, 2010 4:34 AM
Edited by: sushovan on Nov 22, 2010 4:36 AM
Edited by: sushovan on Nov 22, 2010 8:58 AM

Page level validation to prevent duplicate data entry into the database

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Hi Ben,
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HTP.P('
<SCRIPT LANGUAGE=javascript>
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var mmObj;
var yyObj;
var day;
var mon;
var year;
var field_val;
var field_name;
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Check Duplicate data during data key-in Multi Record Block

Dear all,
I have a situation where i have to check duplicate data entry(on a particular field,which is a mandatory field,i.e. it cannot be skipped by user without entering value) while data key-in in a Multi Record block.
As for reference I have used a logic,such as
1>In a When-Validate-Record trigger of that block I am assigning the value of that current item in Table type variable(collection type)
as this trigger fire every time as soon as i leave that record,so its assigning the value of that current time.And this process continues
then
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When-Validate-Record trigger
When-Validate-Item triggerThat smells like Oracle Forms...
And the Oracle Forms forum is over here: Forms

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1    abc         34    2
2    efg          23    34
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1    abc          34    2
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Thanks,
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Error index is concerned with the pattern not with the value.
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Hello, I'm German
Probably you can restrict the characters used for text entry, so for example ü is allowed in the German form but not in French.
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dcminter wrote:
It is a [form] and doesn't contain any complex business logic. So I want to get this simple business logic to different layer. But the problem is, I cannot clearly identify what are business logic of this kind of [form].Are you asking which bits are business logic?
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Yep, I definately like that definition.
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Payous999 wrote:
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http://john-goodwin.blogspot.com/

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Validate duplicate data entry by user on form

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