Question

我试图在while循环中使用select作为条件。我想使用while循环来比较随机数和table09中的数字，而数字不在table09中。但我的脚本以错误结束。如何在while循环中使用select作为条件？我有这段代码：

declare 
  my_idadh varchar(14);
  n number;
begin 
n:=round(dbms_random.value(10000000000000,99999999999999));
my_idadh:=to_char(n);

while exists(select idadh from table09 where idadh=my_idadh)
  loop
    n:=round(dbms_random.value(10000000000000,99999999999999));
    idadh:=to_char(n);
  end loop;
end;

谢谢，彼得

Answer 1

you can put your query inside the loop and check the condition with a variable like this:

V_dummy :=1;

While (v_dummy = 1) loop

Begin

select 1
Into v_dummy
from table09 
where idadh=my_idadh

Exception when no_data_found then
Exit;
End;

-- you loop code here...

End loop;

PL / SQL在while循环中选择条件

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