How to recognize operator from dbase

Hi All,
I have a small query regarding the rule retrieving from dbase.Let me clear that.
I have a dbase which have some java expressions like,
     >
     <
     >=
     <=
     +
     ||
     !=
     and so on...............
The dbase columns something like this...
field1     field2     field3
x     <     y
l     + z
u != m
now when i am trying to execute the rule in my class(logic)file.....it would look some thing like this,
rs.getInt(field1)
rs.getString(field2)
rs.getString(field3)
when i am trying to execute the condition like (l+z)....its not able to recognize the '+' operator as it is in the string format retrieved from dbase.....
Hope I am clear about my query...plz do lemme know how to go about this issue...
Thanks and Regards
Kishore

sounds like you need to build an expression analyser (and probably executor).
Good luck. They're fun exercises.

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