declare
RoomID Room.RoomID%Type;
RoomName Room.RoomName%Type;
cursor crRoom is select RoomID,RoomName from Room;
begin
open crRoom;
loop;
fetch crRoom into RoomID,RoomName;
exit when crRoom%notFound;
end loop;
close crRoom;
end;
3.1在游标使用入口参数
在SQL语句的Where 子句中恰当使用 相关语句简化逻辑，本来需要使用两个游标，把相关入口参数放入到SQL语句的Where 子句中，一个就搞定了：
cursor crRoom is
select
distinct 楼层,房屋用途
from TT_没有处理的房屋 t
where 数据级别>= 0 and 房屋处理类别= 3 and 产权编号=p_产权编号
and 拆迁房屋类别=p_拆迁房屋类别
and 面积>0 and (not p_房屋用途 is null
and 房屋用途=p_房屋用途
or p_房屋用途 is null);
另外一个例子：
CREATE OR REPLACE PROCEDURE PrintStudents(
p_Major IN students.major%TYPE) AS
CURSOR c_Students IS
SELECT first_name, last_name
FROM students
WHERE major = p_Major;
BEGIN
FOR v_StudentRec IN c_Students LOOP
DBMS_OUTPUT.PUT_LINE(v_StudentRec.first_name || ' ' ||
v_StudentRec.last_name);
END LOOP;
END;
Oracle带的例子examp6.sql
DECLARE CURSOR bin_cur(part_number NUMBER) IS SELECT amt_in_bin
FROM bins
WHERE part_num = part_number AND
amt_in_bin > 0 ORDER BY bin_num
FOR UPDATE OF amt_in_bin;
bin_amt bins.amt_in_bin%TYPE;
total_so_far NUMBER(5) := 0;
amount_needed CONSTANT NUMBER(5) := 1000;
bins_looked_at NUMBER(3) := 0;
BEGIN
OPEN bin_cur(5469);
WHILE total_so_far < amount_needed LOOP
FETCH bin_cur INTO bin_amt;
EXIT WHEN bin_cur%NOTFOUND;
/* If we exit, there's not enough to *
* satisfy the order. */ bins_looked_at := bins_looked_at + 1;
IF total_so_far + bin_amt < amount_needed THEN
UPDATE bins SET amt_in_bin = 0 WHERE CURRENT OF bin_cur;
-- take everything in the bin total_so_far := total_so_far + bin_amt;
ELSE -- we finally have enough UPDATE bins SET amt_in_bin = amt_in_bin
- (amount_needed - total_so_far)
WHERE CURRENT OF bin_cur;
total_so_far := amount_needed;
END IF;
END LOOP;
CLOSE bin_cur;
INSERT INTO temp VALUES (NULL, bins_looked_at, '<- bins looked at');
COMMIT;
END;
-- Created on 2004-8-9 by ADMINISTRATOR
declare
--带有变量的Cursor
cursor crBooks(c_bookTitle varchar2) is
select *
from books a
where a.title like c_bookTitle||'%';
begin
for v_Books in crBooks('Oracle8') loop
dbms_output.put_line(v_Books.author1);
end loop;
end;
3.2.使用对象的属性
-- Author : XJG
-- Created : 2002.03.01 20:52:22
-- Purpose : 产生拆迁数据的报表数据
procedure GenConCQReport (
p_UserID in Common.SEQType, ---0 =使用权,1 = 高级使用权,2 = 机团
p_UserType in Common.THundred) is
type TTitleArr is varray (5) of varchar2 (20);
v_Title TTitleArr
:= TTitleArr ('可以签订的财产',
'已经签订的财产',
'可能可以签定的财产',
'不能签订的财产',
'已签定的合同'
);
v_DateLevel TTitleArr := TTitleArr ('1', '2', '3', '4', '5');
begin
forall i in v_Title.first .. v_Title.last
update TT_拆迁数据分类 T
set T.数据级别 = to_number (v_DateLevel (i))
where (T.财产编号 is not null)
and (T.财产编号, T.财产类别) in (
select TT.财产编号, TT.财产类别
from TT_拆迁数据分类 TT
start with TT.标题 = v_Title (i)
connect by prior TT.拆迁数据分类编号 =
TT.上级编号);
end;
3.3匿名游标
匿名游标,是我自己给的一个称呼。在游标FOR循环中可以定义查询，由于没有显式声明所以游标没有名字，记录名通过游标查询来定义。
DECALRE
v_tot_salary EMP.SALARY%TYPE;
BEGIN
FOR r_dept IN (SELECT deptno,dname FROM dept ORDER BY deptno) LOOP
DBMS_OUTPUT.PUT_LINE('Department:'|| r_dept.deptno||'-'||r_dept.dname);
v_tot_salary:=0;
DBMS_OUTPUT.PUT_LINE('Toltal Salary for dept:'|| v_tot_salary);
END
END;
3.4游标指针
-- Author : wdz
-- Created : 2003-10-22
-- Purpose : 使用系统定义的游标指针类型作为参数
http://wdzwdz.itpub.net/post/197/540