How to check the data type dynamically

hi all
my requirement is like this in one screen field which is of character type user is inputing data .
now while saving to the database i have to apply one external check for this data if it is integer type or not
as this data on the screen is refrenced to the database so i can not change the data type on the screen itself .
i have to check it externally from PAI ....... would any one please help on this
Thanks and regards
Papps

Hi
Thanks again you are right i missed the space one ..
but Now another problem...
I have tried that but in that case even user can input data by mistake like this
123 4 but this is not an integer it should also give error as this is also not a correct integer ...
as par asi think . we have to aain check if there is any spaces in the data provided i guess or
is there any other procedure ?

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