How Can i create a package/trigger

Hi Every1,
I want to create a database trigger which act on entering the charahters and count the characters.
e.g
you can understand with the example
if i press 01 in a specific column the length of characters is two after this automatically the character sign i.e. / ( forward slash ) appers and then i can write 03 again the month and then again automatically / slash appers and i press 2009 and then go on
then the filed will look likes 01/03/2009
simply i dont want to press the / sign in the date fileld or place sign after ENTER through format mask property in forms 6i
can any1 please help me
Regards
M. Laeeque A.

I want to create a database trigger which act on entering the charahters and count the characters.I guess you're talking about a forms-trigger, not a database-trigger.
if i press 01 in a specific column the length of characters is two after this automatically the character signi don't think thats possible in 6i. In 10g you could write a java-bean for that.

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