数据库 sql for loop 常用脚本更新数据

declare  i    number := 1;  temp varchar2(50);  yizi varchar2(60);begin  for tttt in (select aa.code, aa.value from aa) loop    select b.id      into temp      from tb_test1 b     where b.project_code = tttt.value;    select b.orgexattribute1id into yizi from tb_test1 b where b.id = temp;    update tb_test2 mbs       set mbs.ID_SUBJECT = temp, mbs.id_factor = yizi     where mbs.id_budget_unit = tttt.code;    i := i + 1;    commit;  end loop;  dbms_output.put_line(i);end;