Function re-write

Hi,
I have a funtion. I would like to know how "p_max_date" & "p_min_date" are being calculated based on "p_qry" being passed. I need to re-write this function without using DBMS_SQL. I would like to know the business logic of this function.
FUNCTION Get_Time_Stamp(p_qry       Varchar2,
                        p_limit     Number,
                        p_min_date In Out Varchar2,
                        p_max_date In Out Varchar2)
RETURN BOOLEAN
IS
v_cur    Integer := DBMS_SQL.OPEN_CURSOR;
v_fdbk   Integer;
id_tab   DBMS_SQL.VARCHAR2_TABLE;
indx     Number;
retval   Boolean := FALSE;
BEGIN
If(p_limit > 0)
Then
    DBMS_SQL.PARSE(v_cur,p_qry,1);
    DBMS_SQL.DEFINE_ARRAY(v_cur,1,id_tab,p_limit,1);
    v_fdbk := DBMS_SQL.EXECUTE_AND_FETCH(v_cur);
    DBMS_SQL.COLUMN_VALUE(v_cur,1,id_tab);
    If(v_fdbk > 0)
    Then
      retval := TRUE;
      indx := id_tab.FIRST;
      p_max_date := id_tab(indx);
      indx := id_tab.LAST;
      p_min_date := id_tab(indx);
    End If;
End If;
DBMS_SQL.CLOSE_CURSOR(v_cur);
Return retval;
Exception
When others then
    DBMS_SQL.CLOSE_CURSOR(v_cur);
    Return FALSE;
End Get_Time_Stamp;-----------Parameters-------------
p_qry = A SQL query is being passed into the function.
p_limit = 100
p_min_date = date returned. Which min date of the SQL query??
p_max_date = date returned. Which max date of the SQL query??
Any help appreciated.
Thanks

> I need to re-write this function without using DBMS_SQL
If the function takes a piece of text as input that is a SQL query, then you cannot avoid using dynamic SQL.
However, it looks like it is dynamic, but there are several assumptions made in the code, that makes the function get_time_stamp only suitable for very specific queries:
- the query has to select only one varchar2 column, or maybe the datatype is different, but then this function would be sloppy
- the query has to be ordered by a date in descending order
The business logic is something like this:
Take a query text, execute it and fetch a maximum of 100 rows and return the first maximum date as in/out parameter p_max_date, and return the smallest or 100th date as p_min_date. The function (which should really be a procedure, by the way) returns true if p_max_date and p_min_date are not null and false if both are null.
Hope this helps.
Regards,
Rob.

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