Setting a variable values only in the first time

Hi all,
I have a problem regadring PL-SQL coding..actually its something related to programming logics.
I'm calling a method (modify) from client application and which calls several other methods. (check_update and update)
method update updates the database and then calls some other method. (modify_something) That method modify_update calls check_update and and update methods.
Also i have a global variable (var_1) defined in the packages level which is used for some condition checking in update method. But unfortunatly i have to change the value of that variable in modify_something method. So the original value of the var_1 is lost.
Is there anyway to keep the original value of this variable...please dont tell that i have to stop changing the variable value in modify_something its NOT possible at any cost.
Expecting some help from PL-SQL gurus..
thanks in advance..
/garuka

Hi,
I know about the concept of scoping. The problem here is not that.
The problem is how i change a value of a variable only once when it calls for the first time and stop changing the value for the other times.
If i explain it little more its like this.
I want to change the value of the var_1 when it check_modify calls for the first time. and use if in some other methods. But var_1 is modified by some other client methods which are called by update method which is called after check_update method.
So my problem is if i use the solution samir told how i set the value to that var only once when it calls in the check_update for the first time and then to stop setting it during other method calls and within check_update method which calls recursively.
Simply do the variable assignment only in the first request only..
/garuka

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Setting a variable values only in the first time

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