如何在动态sql(ORACLE PLSQL)中的本地临时变量中获取count(*)值

Question

我想count(*)在动态plsql语句中获得价值.我们可以编写静态stmt:

select count(*) into tmp_cnt from table_info where nbr_entry='0123456789';

但是如何tmp_cnt在编写动态sql stament时获得价值？或任何其他方式将count(*)价值变为tmp_cnt变量？

Answer 1

也许不同的oracle版本,但对我有用的是:

...
execute immediate 'select count(*) from ' || p_table_name into l_count;
...

Answer 2

您可以通过EXECUTE IMMEDIATE实现它...返回:

function count_rows(p_table_name varchar2)
  return number
is
  l_count number;
begin
  execute immediate 'select count(*) from ' || p_table_name returning into l_count;
  return l_count;
end count_rows;