Call two selects in a function?

Question

Hi, I am fairly new to oracle.
I have written a function that returns a sql statement that I would like to execute and return the results.
I have another function that I can execute the statement with, I so far have no idea of how to put this together.
This is the one that returns a sql statement:
CREATE OR REPLACE function fnMyFunc1(var_in IN varchar2) return varchar2
as
x varchar(32767);
BEGIN
SELECT fnMyFunc2(var_in) into x from dual;
return x;
end;and this is the one that executes it:
create or replace function fnExecX(sql_in IN varchar2) return XmlType
as
x XmlType;
Begin
EXECUTE IMMEDIATE (fnExecV(sql_in)) into x;
return x;
end;I would like to just execute it in the first one and return the XmlType from the first function or have a function that calls the first one, gets the result, passes it to the second and returns the xmltype.
Any help would be much appreciated.

Answer 1

I am not sure if this is what you are looking for, anyway here is something I tried :
-- function that creates the dynamic sql
CREATE FUNCTION f2 (var_in VARCHAR2) RETURN VARCHAR2 IS
sql_str VARCHAR2(250);
BEGIN
sql_str := 'SELECT SYSDATE FROM '|| var_in;
RETURN sql_str;
END;
-- function that calls the dynamic sql creating function
CREATE FUNCTION f1 (var_in VARCHAR2) RETURN VARCHAR2 IS
sql_str VARCHAR2(250);
BEGIN
SELECT f2(var_in) INTO sql_str FROM dual;
RETURN sql_str;
END;
-- function that executes the dynamic query :
CREATE FUNCTION f3 (var_in VARCHAR2) RETURN DATE IS
exec_sql VARCHAR2(250);
dd DATE;
BEGIN
SELECT f1(var_in) INTO exec_sql FROM dual;
EXECUTE IMMEDIATE exec_sql INTO dd;
RETURN dd;
END;
-- output from sqlplus
SQL> select f3('dual') from dual;
F3('DUAL'
21-DEC-05
SQL>
HTH