/**
  * 添加inject
  */
 public function doAddAction()
 {
     list($alias, $hook_name, $class, $method, $loadway, $expression, $description) = $this->getInput(array('alias', 'hook_name', 'class', 'method', 'loadway', 'expression', 'description'));
     $dm = new PwHookInjectDm();
     $dm->setAlias($alias)->setHookName($hook_name)->setClass($class)->setMethod($method)->setLoadWay($loadway)->setExpression($expression)->setDescription($description);
     $r = $this->_injectDs()->add($dm);
     if ($r instanceof PwError) {
         $this->showError($r->getError());
     }
     $this->showMessage('success');
 }