游标变量和打开游标并获取数据的显式方式。它不是
允许在FOR循环中使用游标变量：
declare
l_sql varchar2(123); -- variable that contains a query
l_c sys_refcursor; -- cursor variable(weak cursor).
l_res your_table%rowtype; -- variable containing fetching data
begin
l_sql := 'select * from your_table';
-- Open the cursor and fetching data explicitly
-- in the LOOP.
open l_c for l_sql;
loop
fetch l_c into l_res;
exit when l_c%notfound; -- Exit the loop if there is nothing to fetch.
-- process fetched data
end loop;
close l_c; -- close the cursor
end;
602392714
清零编程群