a simple programming question

I have the following problem;
The client of the DB issues a lot of the SQL commands over a network , the
statements are of the simple form - select an integer from some table(s)
using some criteria.
I want to create a function that will accept the string containing all the
statements to be executed, a string containing the length of the statements
to be executed and will return the string containing all the integer values
retrieved.

And the questions are:
1. How to execute a sql statement that is contained in the text variable in
the function
2. How to get the result of that statement into a variable.

Thanks.
Jefim Matskin
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Senior SW engeneer
Sphera Corporation
Tel: +972.3.613.2424 Ext:104
mailto:mjefim(at)sphera(dot)com
http://www.sphera.com/