oracle动态sql，传值using的用法

declare
  i_bank_id   varchar2(10) := \'15\';
  i_bank_name varchar2(100) := \'testyy\';
  i_flag      varchar2(1) := \'0\';
  i_oper_time date := sysdate;
begin
  execute immediate \'insert into sys_bank values(:p1,:p2,:p3,:p4)\'
    using i_bank_id, i_bank_name, i_flag, i_oper_time;
  commit;
end;