to change variable defaulted values dynamically using field symbol

Hi Team,

Suppose in my program, I have declared two variables and defaulted values there itself.

data:var_a  type c value 'X',

       var_b  type i value '102.

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Now in the middle of program I want ot change the values based on what is present in data base .

In my datbase table the values are like this,

I have to fetch teh new values and change the variable var_a and var_b values , and those values are used in later part of my program.

After the change write:var_a, var_2. should print K and 500.

Can anybody help me with  a very small smaple program that does that.

Thanks,

Sourya Prakash.