oracle - 在 SQL Plus 中运行查询

Question

我必须在 SQLPLUS 的循环中运行一个查询。并且循环计数来自其他一些 SQL 查询。所以我必须声明一个变量，它将采用计数值。现在我想在我的查询中使用这个变量。我怎么能做同样的事情。请建议我提前谢谢

Answer 1

If I understand the question correctly, you can use a SQL*Plus variable coupled with a selected column to accomplish this:

SQL> undefine loop_ctr
SQL> column loop_ctr new_value loop_ctr noprint
SQL> select 5 AS loop_ctr from dual;


SQL> set serveroutput on
SQL> begin
  2  for i in 1..&&loop_ctr
  3  loop
  4  dbms_output.put_line('i = ' || i);
  5  end loop;
  6  end;
  7  /
old   2: for i in 1..&&loop_ctr
new   2: for i in 1..         5
i = 1
i = 2
i = 3
i = 4
i = 5
SQL> 

Hope that helps

Answer 2

BEGIN
   DECLARE
      count_loop           NUMBER DEFAULT 0; -- counter coming from some other SQL query...
      progressive_number   NUMBER DEFAULT 0;
      copy_count_loop      NUMBER DEFAULT 0;
   BEGIN
      -- calculus generating the COUNT_LOOP value > 0.
      copy_count_loop := count_loop;

      FOR progressive_number IN 1 .. count_loop
      LOOP
      -- do your operations using copy_count_loop
      END LOOP;
   END;
END;
/

目前还不清楚您想用 COUNT_LOOP 做什么。在进入 FOR 循环之前，我已经制作了计数器的副本，因此您可以在 FOR 循环中使用 COPY_COUNT_LOOP ，而不会影响progressive_number 变量，也不会影响count_loop 变量。