Returning SQL cursor from Stored Procedure

Question

Hi,
I have a query regarding returning sql cursor from stored procedure to java in oracle 11g.
I want to query some data ex: my query returns A, B, C. Also, now I want to query some other data ex: D, E, F. Now I want to return this data as an sql cursor as a single row . Example: A,B,C,D,E,F. Is it possible to return/create a cursor in stored procedure?
assume both query returns equal number of rows.. however both are not related to each other..

Answer 1

RP wrote:
Hi,
I have a query regarding returning sql cursor from stored procedure to java in oracle 11g.
I want to query some data ex: my query returns A, B, C. Also, now I want to query some other data ex: D, E, F. Now I want to return this data as an sql cursor as a single row . Example: A,B,C,D,E,F. Is it possible to return/create a cursor in stored procedure?
assume both query returns equal number of rows.. however both are not related to each other..It sounds like what you need is a ref cursor.
First thing to remember though is that cursors do not hold any data (see: {thread:id=886365})
In it's simplest form you would be creating a procedure along these lines...
SQL> create or replace procedure get_data(p_sql in varchar2, p_rc out sys_refcursor) is
  2  begin
  3    open p_rc for p_sql;
  4  end;
  5  /
Procedure created.
SQL> var rc refcursor;
SQL> exec get_data('select empno, ename, deptno from emp', :rc);
PL/SQL procedure successfully completed.
SQL> print rc;
     EMPNO ENAME          DEPTNO
      7369 SMITH              20
      7499 ALLEN              30
      7521 WARD               30
      7566 JONES              20
      7654 MARTIN             30
      7698 BLAKE              30
      7782 CLARK              10
      7788 SCOTT              20
      7839 KING               10
      7844 TURNER             30
      7876 ADAMS              20
      7900 JAMES              30
      7902 FORD               20
      7934 MILLER             10
14 rows selected.
SQL> exec get_data('select deptno, dname from dept', :rc);
PL/SQL procedure successfully completed.
SQL> print rc
    DEPTNO DNAME
        10 ACCOUNTING
        20 RESEARCH
        30 SALES
        40 OPERATIONS
        50 IT SUPPORTWhich takes an SQL statement (as you said that both your queries were unrelated), and returns a ref cursor, and then your Java code would fetch the data using that cursor.
Now, as for getting your rows to columns and combining two queries that do that... something along these lines...
SQL> select * from x;
C
A
B
C
SQL> select * from y;
C
D
E
F
SQL> ed
Wrote file afiedt.buf
  1  select x.col1, x.col2, x.col3
  2        ,y.col1 as col4
  3        ,y.col2 as col5
  4        ,y.col3 as col6
  5  from (
  6        select max(decode(rn,1,col1)) as col1
  7              ,max(decode(rn,2,col1)) as col2
  8              ,max(decode(rn,3,col1)) as col3
  9        from (select col1, rownum rn from (select * from x order by col1))
10       ) x
11  cross join
12       (
13        select max(decode(rn,1,col1)) as col1
14              ,max(decode(rn,2,col1)) as col2
15              ,max(decode(rn,3,col1)) as col3
16        from (select col1, rownum rn from (select * from y order by col1))
17*      ) y
SQL> /
C C C C C C
A B C D E F... will do what you ask. For further information about turning rows to columns read the FAQ: {message:id=9360005}