OracleÀ©Õ¹PL/SQL¼ò½é(Áù)

8.    bulk collect /forall
ʹÓÃbulk collect¿ÉÒԳɿéµØ¶ÁÈ¡Êý¾Ý£¬Ëü¿ÉʹSQLÒýÇæÔÚ·µ»ØÊä³ö½á¹û¸øPL/SQLÒýÇæ֮ǰ´óÅú°ó¶¨Êä³ö¼¯ºÏ¡£ÕâÑù¿ÉÒÔÒ»´ÎÐԵذÑÊý¾Ý¶¯Ì¬µØ×°Ôص½¼¯ºÏÖУ¬µ«bulk collectÐèÒª´óÁ¿ÄÚ´æ¡£bulk collect¿ÉÓÃÓÚselect into¡¢fetch intoºÍreturning intoÓï¾äÖС£
¡ñ    select intoÖÐʹÓÃbulk collect
declare
  type t_email is table of employees.email%type;
  v_email_list t_email;
begin
  select email bulk collect
    into v_email_list
    from employees
   where department_id = 50;
  dbms_output.put_line('»ñÈ¡emailµØÖ·Êý£º' || v_email_list.count);
end;
/
»ñÈ¡emailµØÖ·Êý£º45
¡ñ    fetch into ÖÐʹÓÃbulk collect
declare
  type t_emp is table of employees%rowtype;
  v_emp_list t_emp;
  cursor c_emp is
    select * from employees where department_id = 50;
begin
  open c_emp;
  --ÔÚfetch intoÖÐʹÓÃbulk collect
  fetch c_emp bulk collect
    into v_emp_list;
  dbms_output.put_line('»ñÈ¡¹ÍÔ±×ÜÊý£º' || v_emp_list.count);
end;
/
»ñÈ¡¹ÍÔ±×ÜÊý£º45
¡ñ    ÔÚreturning intoÖÐʹÓÃbulk collect
ͨ¹ýʹÓÃreturning×Ó¾äbulk collect¿É·µ»ØÖµ¸øµ÷Óùý³Ì£¬²»ÐèÒª¶îÍâ»ñÈ¡fetchÓï¾ä¡£
--´´½¨²âÊÔ±í
create table emptemp as select * from employees where department_id=50;
--Ö´Ðйý³Ì
declare
  type t_id_list is table of number;
  type t_name_list is table of varchar2(32);
  ids   t_id_list;
  names t_name_list;
begin
  delete from emptemp
   where commission_pct is null
  returning employee_id, first_name bulk collect into ids, names;
  dbms_output.put_line('Deleted ' || sql%rowcount || ' rows:');
  for i in ids.first .. ids.last loop
    dbms_output.put_line('Employees #' || ids(i) || ': ' || names(i));
  end loop;
  commit;
exception
  when others then
    rollback;
end;