exit用来跳出循环
loop
IF V_KBP IS NULL THEN
EXIT;
END IF;
end loop;
return跳出存储过程
loop
IF V_KBP IS NULL THEN
return;
END IF;
end loop;
loop
IF V_KBP IS NULL THEN
EXIT;
END IF;
end loop;
loop
IF V_KBP IS NULL THEN
return;
END IF;
end loop;