使用游标时查询不给出poper输出

Question

我有一个PL / SQL块，我试图获取表格每列的填充值和未填充值，即＆＃34; demo_table＆＃34;。

select  count(*) into v_count from demo_table 
where owner='OWNER_1' and(rec.COLUMN_NAME is   null OR 
REGEXP_LIKE(rec.COLUMN_NAME,'^-$') OR REGEXP_LIKE (rec.COLUMN_NAME,'^-$'));

我正在通过dbms_output显示v_count。但我无法得到统计数据。

这就是我在做的事情：

declare
  CURSOR C1 IS
  SELECT COLUMN_NAME FROM ALL_TAB_COLUMNS
  WHERE TABLE_NAME ='demo_table';

  v_count number(10);
begin    
  for rec in c1 loop
    dbms_output.put_line(rec.COLUMN_NAME);
    select count(*) into v_count from demo_table
    where owner='OWNER_1'
    and(rec.COLUMN_NAME is null
      OR REGEXP_LIKE(rec.COLUMN_NAME,'^-$')
      OR REGEXP_LIKE (rec.COLUMN_NAME,'^-$'));
    dbms_output.put_line(v_count);
  end loop;   
  dbms_output.put_line(v_count);    
end;