Ref cursor help in Reports/pl sql

Question

Hello , i am new to this , please help!
From oracle forms, we have a table and one of the columns from that table returns rows and the result are like ( select name, messaging_id, listing_id from dynamic_message group_query) ..I am trying to join this table with other tables based on a group type, based on if it returns 'D' or 'S' to other groups in report.
I am getting the following error when I uncomment the open cursor statemnt
PLS-00455: cursor 'TEMP_GRP_REC_REFCUR' cannot be used in dynamic
SQL OPEN statement
This is what i have so faar:
create or replace PACKAGE grp IS
TYPE grp_rec IS RECORD
(listing_id varchar2(16 ),
messaging_id varchar2(16 ),
name varchar2(256 ) ,
group_number Number);
TYPE grp_rec_refcur is REF CURSOR RETURN grp_rec;
function grprefc(P_group_number NUMBER, P_group_type CHAR) return grp_rec_refcur;
END;
CREATE OR REPLACE PACKAGE BODY grp IS
function grprefc(p_group_number Number )
return grp_rec_refcur
IS
temp_grp_rec_refcur grp.grp_rec_refcur;
v_stmt_str VARCHAR2(2000) := NULL;
v_cov_name listing.name%TYPE := NULL;
v_cov_mid listing.messaging_id%TYPE := NULL;
v_cov_lid listing.listing_id%TYPE := NULL;
v_grpnum message_group.group_number%TYPE := NULL;
BEGIN
          v_stmt_str:='SELECT dmgq.resolved_query
          INTO v_stmt_str
          FROM dynamic_message_group_query dmgq
          WHERE dmgq.group_number = p_group_number';
OPEN temp_grp_rec_refcur FOR v_stmt_str;
     LOOP
     FETCH temp_grp_rec_refcur INTO v_cov_lid , v_cov_mid ,v_cov_name, v_grpnum ;
     EXIT WHEN temp_grp_rec_refcur %NOTFOUND;
     END Loop;
     RETURN temp_grp_rec_refcur;
END;
END;
show errors;
if there are any examples done by someone in reoprts or if you can help me solve the above, i would higghly appreciate it .
Thanks and Good Day!

Answer 1

Maybe something like my second example "Dynamic Table in the Second Query with Oracle Reports"
- ref cursor or "simple" query Q1, which has a column "group_type", linked to a ref cursor query Q2.
Ref cursor query Q2 - pseudo code for function:
CREATE OR REPLACE PACKAGE BODY grp IS
FUNCTION A_join_B_or_A_join_C_join_D
  (p_group_type CHAR(1), p_group_number NUMBER)
  RETURN dynamic_refcur
IS
  l_refcur dynamic_refcur;
  l_stmt_str VARCHAR2(2000) := NULL;
BEGIN
  IF p_group_type = 'S' THEN
    -- join A and B
    OPEN l_refcur FOR
      SELECT ...
        FROM A, B
       WHERE A.x = B.y;
  ELSE -- p_group_type = 'D'
    SELECT resolved_query
      INTO l_stmt_str
      FROM dynamic_message_group_query
     WHERE group_number = p_group_number;
    -- join A, C and D (= dynamically created SELECT)
    OPEN l_refcur FOR
      'SELECT ...
         FROM A, C, (' || l_stmt_str || ') D
        WHERE A.x = C.y
          AND A.z = D.t';
  END IF;
  RETURN l_refcur;
END;
END; Regards,
Zlatko