Order by dynamic variable

Question

Hello,
I am trying to sort my query based on a dynamic variable p_sorton in the cursor as follows:
function getMarketView2(
p_event_id in ex_event.event_id%type,
p_fromrow in integer,
p_torow in integer,
p_appTZ in char,
p_calcTZ in char,
p_sorton in varchar2) return varchar2 as
type t_ticket_trade is ref cursor return ex_ticket_trade%rowtype;
v_return varchar2(32767);
v_return_integer integer;
v_String varchar2(32767);
v_ex_ticket_trade_obj ex_ticket_trade_obj;
v_rowcount integer:=0;
v_rowtotal integer:=0;
v_done boolean:=false;
v_sysdate date:=NEW_TIME(SYSDATE,trim(p_appTZ),trim(p_calcTZ));
cursor cur_ticket_trade_event_open (p_event_id in ex_event.event_id%type, v_sysdate in date) is
select "TICKET_TRADE_ID","SELLER_ACCESS_ID","CREATE_DATETIME","MODIFY_DATETIME","LASTMODIFY_BY",
"BUYER_ACCESS_ID","OPEN_TRADE_DATE","CLOSE_TRADE_DATE","TICKET_SUITE_CODE","TICKET_DATETIME",
"TICKET_TIMEZONE","TICKET_EVENT_ID","TICKET_TYPE","TICKET_SEAT_TYPE","TICKET_OPPONENT",
"TICKET_TOTAL_SEAT","TICKET_PRICE","TICKET_PRICE_EXT","START_BID_DATE","OPEN_BID_PRICE",
"CURRENT_BID_COUNT","CURRENT_HIGH_BID","CURRENT_LAST_BID_DATETIME","CURRENT_BID_INCREMENT_BY","TICKET_TRANSACTION_DATE",
"TICKET_TRADE_STATUS" from ex_ticket_trade
where ex_ticket_trade.TICKET_EVENT_ID = p_event_id
and (ex_ticket_trade.ticket_datetime > v_sysdate)
and (ex_ticket_trade.ticket_trade_status in ('F','A','AB'))
and (ex_ticket_trade.ticket_suite_code='N' OR ex_ticket_trade.ticket_suite_code='Y')
order by p_sorton desc;
--ex_ticket_trade.ticket_datetime desc;
........then comes the rest of the code........
This code compiles fine but does not use the value passed in the param p_sorton in the order by clause.
the same code works fine when hardcoded to "ex_ticket_trade.ticket_datetime"
No idea where I may be going wrong?
Also can I do anything like ORDER BY v1 v2
where v1 specifies columns to sort on and v2 asc/desc, coz that's what I really need to do?
Pls help ...
Thanks,
Karuna

Answer 1

Hi,
Thanks for the reply ... I tried the same but due to my basic knowledge of pl-sql, I'm running into some other problem.
================================================
CREATE OR REPLACE FUNCTION testMarketView(p_event_id in ex_event.event_id%type,
p_fromrow in integer,p_torow in integer,
p_appTZ in char, p_calcTZ in char, p_sorton in varchar2
               ) return varchar2 as
type t_ticket_trade is ref cursor return ex_ticket_trade%rowtype;
     v_return varchar2(32767);
     v_return_integer integer;
     v_String varchar2(32767);
     v_ex_ticket_trade_obj ex_ticket_trade_obj;
     v_rowcount integer:=0;
     v_rowtotal integer:=0;
     v_done boolean:=false;
     v_sysdate date:=NEW_TIME(SYSDATE,trim(p_appTZ),trim(p_calcTZ));
     TYPE t_ticket_trade_event IS REF CURSOR;
     cur_ticket_trade_event t_ticket_trade_event;
     v_dynQuery VARCHAR2(1000);
     cursor cur_event_seat_section_row (p_ticket_trade in ex_event_seat_inv.ticket_trade_id%type) is
     select distinct event_seat_section, event_seat_row
     from ex_event_seat_inv
     where ticket_trade_id = p_ticket_trade;
     type t_event_seat_section_row is ref cursor return cur_event_seat_section_row%rowtype;
/*v_section varchar2(32767);
     v_section_row varchar2(32767);
     the 26 variables that belong to table ex_ticket_trade-----------
     v_ticket_transaction_date date;
     v_ticket_trade_status varchar2(10);*/
begin
v_dynQuery := 'select
"TICKET_TRADE_ID","SELLER_ACCESS_ID","CREATE_DATETIME","MODIFY_DATETIME","LASTMODIFY_BY",
"BUYER_ACCESS_ID","OPEN_TRADE_DATE","CLOSE_TRADE_DATE","TICKET_SUITE_CODE","TICKET_DATETIME",
"TICKET_TIMEZONE","TICKET_EVENT_ID","TICKET_TYPE","TICKET_SEAT_TYPE","TICKET_OPPONENT",
"TICKET_TOTAL_SEAT","TICKET_PRICE","TICKET_PRICE_EXT","START_BID_DATE",
"OPEN_BID_PRICE","CURRENT_BID_COUNT","CURRENT_HIGH_BID",
"CURRENT_LAST_BID_DATETIME","CURRENT_BID_INCREMENT_BY",
"TICKET_TRANSACTION_DATE","TICKET_TRADE_STATUS"
from ex_ticket_trade where
ex_ticket_trade.TICKET_EVENT_ID = ' || p_event_id || ' and (ex_ticket_trade.ticket_datetime > '|| v_sysdate||')
and (ex_ticket_trade.ticket_trade_status in ('||'''F'''||','||'''A'''||','||'''AB'''||'))
and (ex_ticket_trade.ticket_suite_code='||'''N'''||' OR ex_ticket_trade.ticket_suite_code='||'''Y'''||')
order by '|| p_sorton ||'desc ' ;
select count(*) into v_rowtotal
from ex_ticket_trade
where
ex_ticket_trade.TICKET_EVENT_ID = p_event_id
and (ex_ticket_trade.ticket_datetime > v_sysdate)
and (ex_ticket_trade.ticket_trade_status in ('F','A','AB'))
and (ex_ticket_trade.ticket_suite_code='N' OR ex_ticket_trade.ticket_suite_code='Y')
order by ex_ticket_trade.ticket_datetime asc;
v_ex_ticket_trade_obj:=ex_ticket_trade_tabobj.initialize;
v_rowcount:=1;
OPEN cur_ticket_trade_event FOR v_dynQuery;
     LOOP
     FETCH cur_ticket_trade_event INTO t_ticket_trade;
/*     -- THIS IS WHAT I HAVE TO DEAL WITH IF I CAN"T
     --PUT THE RESULTS OF THE CURSOR in t_ticket_trade
     v_ticket_trade_id , v_seller_access_id , v_create_datetime, v_modify_datetime , v_lastmodify_by ,
     v_buyer_access_id, v_open_trade_date, v_close_trade_date, v_ticket_suite_code, v_ticket_datetime,
     v_ticket_timezone, v_ticket_event_id , v_ticket_type, v_ticket_seat_type,     v_ticket_opponent,
     v_ticket_total_seat, v_ticket_price ,     v_ticket_price_ext , v_start_bid_date, v_open_bid_price ,
     v_current_bid_count , v_current_high_bid , v_current_last_bid_datetime , v_current_bid_increment_by ,
     v_ticket_transaction_date , v_ticket_trade_status ;
if (t_ticket_trade.TICKET_SEAT_TYPE is null) then
for t_event_seat_section_row in cur_event_seat_section_row(t_ticket_trade.ticket_trade_id) loop
if (t_event_seat_section_row.event_seat_section is not null) then
v_section := t_event_seat_section_row.event_seat_section;
BEGIN
select alt_txt into v_parking_desc from ex_alt_txt
where event_id = p_event_id
and alt_txt_type = 'PARKING_DESC'
and original_txt = v_section;
t_ticket_trade.TICKET_SEAT_TYPE := v_parking_desc;
EXCEPTION
WHEN no_data_found THEN
v_section_row := 'Sec. ' || v_section;
if (t_event_seat_section_row.event_seat_row is not null) then
v_section_row := v_section_row || ', Row ' || t_event_seat_section_row.event_seat_row;
end if;
v_section_row := substr(v_section_row, 1, 30);
t_ticket_trade.TICKET_SEAT_TYPE := v_section_row;
END;
exit;
end if;
end loop;
end if;
if ((v_rowcount >= p_fromrow) and (v_rowcount <= p_torow)) then
-- p_ex_ticket_trade => t_ticket_trade
     -- THIS IS WHAT I CAN'T DO in the next line IF I get the results of the cursor in seperate variables
     v_ex_ticket_trade_obj:=ex_ticket_trade_tabobj.maprowtoobj(p_ex_ticket_trade => t_ticket_trade);
v_string:=v_string||v_ex_ticket_trade_obj.todatastring;
end if;
if (v_rowcount>=p_torow) then
exit;
end if;
v_section := null;
v_section_row := null;
v_parking_desc := null;
v_rowcount:=v_rowcount+1;
end loop;
v_prefix:='1' || v_delimiter || v_rowtotal || v_terminator;
v_return:= v_prefix || v_ex_ticket_trade_obj.tometadata||v_string;
return v_return;
end;
===========================================
I keep running into one error:
PLS-00403: expression 'T_TICKET_TRADE' cannot be used as an INTO-target of a SELECT/FETCH statement
How can I get each row of the cursor either as an object or as 'T_TICKET_TRADE' ?
Thanks,
Karuna