我最近发现了如何使用IPreDeleteEventListener
, IPreInsertEventListener
and IPreUpdateEventListener
in the NHibernate.Event
命名空间。
然而,我仍然困惑这些事件在成功或不成功的最终结果上会返回什么。
例如,让我们看一下 Ayende 的博客文章:
按照他的示例,可以实现如下接口:
public class AuditEventListener : IPreInsertEventListener {
public bool OnPreInsert(OnPreInsert @event) {
var audit = @event.Entity as IHaveAuditInformation;
if (audit == null) return false;
var time = DateTime.Now;
var name = WindowsIdentity.GetCurrent().Name;
Set(@event.Persister, @event.State, "CreatedAt", time);
Set(@event.Persister, @event.State, "CreatedBy", name);
audit.CreatedAt = time;
audit.CreatedBy = name;
return false;
}
}
return 的实际含义是什么true
or false
作为返回值,因为我有另一个例子true
返回而不是false
正如阿延德所写。
- Soft Deletes With NHibernate
这似乎又回来了true
代替false
.
public class SoftDeletableListener : IPreDeleteEventListener {
public void Register(Configuration cfg) {
cfg.EventListeners.PreDeleteEventListeners =
new IPreDeleteEventListener[] { this }
.Concat(cfg.EventListeners.PreDeleteEventListeners)
.ToArray();
}
public Boolean OnPreDelete(PreDeleteEvent @event) {
ISoftDeletable softDeletable = @event.Entity as ISoftDeletable;
if (softDeletable == null) return true;
EntityEntry entry = @event.Session
.GetSessionImplementation()
.PersistenceContext
.GetEntry(@event.Entity);
entry.Status = Status.Loaded;
softDeletable.Deleted = true;
Object id = @event.Persister
.GetIdentifier(@event.Entity, @event.Session.EntityMode);
Object [] fields = @event.Persister
.GetPropertyValues(@event.Entity, @event.Session.EntityMode);
Object version = @event.Persister
.GetVersion(@event.Entity, @event.Session.EntityMode);
@event.Persister.Update(id
, fields
, new Int32[1]
, false
, fields
, version
, @event.Entity
, null
, @event.Session.GetSessionImplementation());
return true;
}
}
所以我想知道,什么false
/true
实际上根据所处理的侦听器来告诉 NHibernate。