-----儲存過程游標使用篇-----
-- 1.隱式游標 : 隱式cursor是系統自動開啟和關閉cursor.
--sql%rowcount 整型 代表dml語句成功執行的資料行數
--sql%found 布林型 值為true代表插入、刪除、更新或單行查詢操作成功
--sql%notfound 布林型 與sql%found屬性返回值相反
--sql%isopen 布林型 dml執行過程中為真，結束後為假
begin
update student set s_name = 'modify' where s_id = 4;
if(sql%found) then
dbms_output.put_line('find the rowdata 。。。');
commit;
else
dbms_output.put_line('unfind the rowdata 。。。');
rollback;
end if;
end;
-- 2.顯示游標
declare
cursor cur is select * from student;
cursor cur2 is select * from student;
sturow student%rowtype;
begin
for stu in cur loop
--sturow := stu;
dbms_output.put_line(stu.s_name);
end loop;
open cur2;
loop
fetch cur2 into sturow;
exit when cur2%notfound;
dbms_output.put_line(sturow.s_name);
end loop;
dbms_output.put_line(cur2%rowcount);
if(cur2%isopen) then
dbms_output.put_line('-close cur2-');
close cur2;
end if;
end;
-- 3.動態游標
declare
type cursor_type is ref cursor;
cur cursor_type;
sqlstr varchar2(40);
rowdata student%rowtype;
begin
sqlstr := 'select * from student';
open cur for sqlstr;
loop
fetch cur into rowdata;
if(cur%notfound) then
exit;
dbms_output.put_line('-not find ...-');
end if;
dbms_output.put_line('-data-'||rowdata.s_name);
end loop;
if(cur%isopen) then
close cur;
end if;
end;
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