Usage of cursor in sql select stmt

Question

HI
how can i use cursor in SELECT statement for fetching the multiple records at a time.
thanx.

Answer 1

Hi,
do you mean something like this? - hope I've understood correctlry :-)
Example in Sql*Plus (v 10)
SCOTT>
SCOTT>SELECT A.TABLE_NAME,
2 CURSOR (SELECT B.COLUMN_NAME
3 FROM ALL_TAB_COLUMNS B
4 WHERE B.TABLE_NAME = A.TABLE_NAME
5 ) CURSOR_1
6 FROM ALL_TABLES A
7 WHERE A.TABLE_NAME = 'DUAL'
8 /
TABLE_NAME CURSOR_1
DUAL CURSOR STATEMENT : 2
CURSOR STATEMENT : 2
COLUMN_NAME
DUMMY
1 row selected.
1 row selected.
SCOTT>
SCOTT>
If you want to user this in PL, you need to declare a cursor and fetch the CURSOR_1 column in a ref cursor
this is another example :
procedure Example1 (ppLocId in locations.location_id%type)
is
type rcRefCursor is ref cursor;
cursor cAllInOne is
select l.city,
cursor (select d.department_name,
cursor (select e.last_name
from employees e
where e.department_id = d.department_id
) eName
from departments d
where d.location_id = l.location_id
) dName
from locations l
where location_id = ppLocId;
cDepts rcRefCursor;
cEmployees rcRefCursor;
vCity locations.city%type;
vDepartment departments.department_name%type;
vEmpName employees.last_name%type;
begin
open cAllInOne;
loop
fetch cAllInOne
into vCity,
cDepts;
exit when cAllInOne%notfound;
loop
fetch cDepts
into vDepartment,
cEmployees;
exit when cDepts%notfound;
loop
fetch cEmployees
into vEmpName;
exit when cEmployees%notfound;
dbms_output.put_line ('City : ' || vCity ||
' Dept : ' || vDepartment ||
' Name : ' || vEmpName
end loop;
end loop;
end loop;
close cAllInOne;
end Example1;
bye
fabio