表单 – 在drupal模块中编辑表单？

我在制作Drupal模块时遇到问题.
我创建了一个表单添加到数据库,但我没有运气创建表单来编辑一些记录这里是我的问题.
问题是当我从数据库中加载值到表单加载并更改它们然后在提交新值之前单击提交按钮表单刷新.所以它更新到数据库同样的事情.这是一个代码：

function edit_form($form,&$form_state) {

$query = db_select('activity','f')
  ->fields('f')
  ->condition('IDA',$_GET['edit']);
$thefile = $query->execute();
$title = "";
$desc = "";
$file = "";
$privacy = "";
    while($record = $thefile->fetchAssoc()) 
    {
        $title = $record['title'];
        $desc = $record['description'];ick submit button form refresh before it submit new values. So it updates into database same thing as it was. Here is a good :

function edit_form($form,'f') ->fields('f') ->co
        $file = $record['trainingresource'];
        $privacy = $record['privacy'];

    }
  $form['activity'] = array(
    '#type' => 'fieldset','#title' => t('Create a new activity'),'#tree' => TRUE,);
  $form['activity']['title'] = array(
      '#type' => 'textfield','#title' => t('Title'),'#description' => t('Please enter the title here.'),'#value' => t($title),);
$form['activity']['description'] = array(
   '#type' => 'textarea','#title' => t('Enter Description'),'#value' => t($desc),'#description' => t('Please put description here.'),);
 /* $form['activity']['date'] = array(
   '#type' => 'date','#title' => t('Enter activity date'),'#description' => t('Please put activity date in here.'),); */
  $form['activity']['file'] = array(
   '#type' => 'file','#title' => t('Submit activity file'),'#value' => t($file),'#description' => t('Please files in here.'),);
  $form['activity']['security'] = array(
'#type' => 'radios','#title' => t('Privacy'),'#value' => t($privacy),'#options' => array('True'=>t('True'),'False'=>t('False')),);
  // Description

  $form['hidden'] = array('#type' => 'value','#value' => 'is_it_here');
  $form['submit'] = array('#type' => 'submit','#value' => t('Save'));
  return $form;
}

这是一个提交表单代码：

function edit_form_submit($form,$form_state) {
$idt = $_GET['edit'];
$title = trim($form_state['values']['activity']['title']);
$desc = trim($form_state['values']['activity']['description']);
//$date = trim($form_state['values']['activity']['date']['year']."-".$form_state['values']['activity']['date']['month']."-".$form_state['values']['activity']['date']['day']);
$file = "file";
$privacy = trim($form_state['values']['activity']['security']['#value']);


$nid = db_update('activity') // Table name no longer needs {}
->fields(array(
  'title' => $title,'description' => $desc,//'date' => $date,'trainingresource' => $file,'privacy' => $privacy,))
->condition('IDA',$idt,'=')
->execute();
drupal_set_message($idt);
drupal_set_message("Added into database");
drupal_goto('activity',array('query'=>array(
'activ'=>$_GET['activ'],)));
}

如果有人有同样的问题或知道如何解决这个问题,请帮助我.

提前致谢.

$form['activity']['description'] = array(
  '#type' => 'textarea',);

$form['activity']['description'] = array(
  '#type' => 'textarea','#default_value' => t($desc),);