plsql遊標最後一行重複的問題
阿新 • • 發佈：2019-01-15
大家仔細看一下，下面第一個儲存過程，test01，有沒問題？
看似沒問題，其實會造成重複行，test02將exit when的語句放到合適的位置上來。就不會出現最後一行重複列印的問題。
create or replace procedure test01 as
cursor cursor1 is
select * from v$session where rownum <= 5;
record1 cursor1%rowtype;
begin
DBMS_OUTPUT.ENABLE(buffer_size => null);
open cursor1;
loop
fetch cursor1 into record1;
dbms_output.put_line(record1.sid);
exit when cursor1%notfound;
end loop;
close cursor1;
end;
-----------------------------------------------------------------------
create or replace procedure test02 as
cursor cursor1 is
select * from v$session where rownum <= 5;
record1 cursor1%rowtype;
begin
DBMS_OUTPUT.ENABLE(buffer_size => null);
open cursor1;
loop
fetch cursor1 into record1;
exit when cursor1%notfound;
dbms_output.put_line(record1.sid);
end loop;
close cursor1;
end;