Diferent querries and flow control in xsql servlets

Question

My question is if i can make a flowcontrol in an xsql servlet.
For example I want to use different querries depending on an attribute which is delivered by an xsql querry.
For shemata example:
<query>
select a from table a
</query>
if a=abc
<query>
select b from table b
</query>
if a=def
<query>
select c from table b
</query>
Is such a thing possible or should i use a PL/SQL block in the xsql Servlet.
Thanks for your answers
Andreas

Answer 1

For a fully-worked example, illustrating how to use <xsql:ref-cursor-function> to programmatically determine a dynamic query, see Chapter 17 of my Building Oracle XML Applications book.
The basic technique is illustrated by the following procedure:
CREATE OR REPLACE PACKAGE App IS
TYPE ref_cursor IS REF CURSOR;
FUNCTION HotItems(userid VARCHAR2) RETURN ref_cursor;
END;
CREATE OR REPLACE PACKAGE BODY App IS
FUNCTION HotItems(userid VARCHAR2) RETURN ref_cursor IS
the_cursor ref_cursor;
my_sal NUMBER := 1;
query VARCHAR2(2000);
BEGIN
IF UPPER(userid) = 'STEVE' THEN
query := 'SELECT ename, sal FROM EMP WHERE ROWNUM < 4';
ELSE
query := 'SELECT dname, deptno FROM DEPT WHERE ROWNUM < 2';
END IF;
OPEN the_cursor FOR query; /* USING var, var, var */
RETURN the_cursor;
END;
END;
/Using <xsql:ref-cursor-function>, depending on the values that you pass to the App.HotItems() function, you'll either get back EMP data or DEPT data.