在plsql中执行IMMEDIATE

如何从此代码中获取结果

EXECUTE IMMEDIATE 'SELECT * FROM ' || table_name

通过循环

通常的方法看起来像这样

for items in (select * from this_table)
loop
htp.p(items.id);
end loop;

解决方法

输入记录：

create type tq84_varchar2_tab as table of varchar2(4000);
/

输入结果集(这是一组记录)：

create type tq84_varchar2_tab_tab as table of tq84_varchar2_tab;
/

执行select并返回结果集实例的函数：

create or replace function tq84_select_star_from_table(table_name in varchar2) 
    return tq84_varchar2_tab_tab
as
    stmt_txt     varchar2(4000);
    cur          number;
    columns_desc dbms_sql.desc_tab;
    column_cnt   number;

    result_set   tq84_varchar2_tab_tab;

begin

    stmt_txt := 'select * from ' || table_name;    

    cur := dbms_sql.open_cursor;

    dbms_sql.parse(cur,stmt_txt,dbms_sql.native);
    dbms_sql.describe_columns(cur,column_cnt,columns_desc);
    dbms_sql.close_cursor(cur);


    stmt_txt := 'select tq84_varchar2_tab(';

    for i in 1 .. column_cnt loop 

        if i != 1 then
           stmt_txt := stmt_txt || ',';
        end if;

        stmt_txt := stmt_txt || columns_desc(i).col_name;

    end loop;

    stmt_txt := stmt_txt || ') from ' || table_name;

--  dbms_output.put_line(stmt_txt);

    execute immediate stmt_txt 
    bulk collect into result_set;

    return result_set;


end tq84_select_star_from_table;

然后可以使用以下功能：

declare
  records   tq84_varchar2_tab_tab;
begin

  records := tq84_select_star_from_table('user_objects');

  for i in 1 .. records.count loop
      dbms_output.put_line (records(i)(5) || ': ' || records(i)(1));
  end loop;

end;
/

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