如何将表名添加到即时执行中的动态查询中

Question

>我很困惑，因为我不知道如何在execute immediate子句中使用变量作为字符串。

declare
  variable1 varchar2(30):
  cur sys_refcursor;
begin
  open cur for
    select tablename from table1;
  loop
    fetch cur into variable1;
    exit when cur %notfound;
    execute immediate 'select count(*)
                         into variable1
                         from user_tables
                        where table_name =''' || variable1 || '''';
  end loop;
  close cur;
end;

此处variable1表名。应该有一个字符串值。怎么做？仍然有错误。

Answer 1

execute immediate 语句应如下所示：

execute immediate 'select count(*) from user_tables where table_name ='''||variable1||'''' into variable1;

查询后进入 xxx。