Question

由于以下问题： Why not to use Spring's OpenEntityManagerInViewFilter

和

http://heapdump.wordpress.com/2010/04/04/should-i-use-open-session-in-view/

我想使用Springs OpenentityManagerInViewFilter的替代方案。这绝对是一个性能问题。如果我禁用OpenentityManagerInViewFilter，我偶尔会收到错误：

LazyInitializationException:42 - failed to lazily initialize a collection

Answer 1

过滤器的一个替代方法是访问延迟加载的集合中的所有元素，然后通过请求将它们发送到视图。但是，此时您应该质疑是否需要急切地获取这些属性。

这是一些要演示的伪代码。

   //Inside controller
   Department dept = dao.findDepartment(id);

   //This will load the entities, avoiding the exception.
   for(Employee e: dept.getEmployees()){ //Assume employees are lazy loaded
     e.getName();
   }

   request.setAttribute("department", dept); //In Spring this could be the model

Spring OpenentityManagerInViewFilter替代方案

1 个答案: