nhibernate - Fluent nHibernate - 查询缓存不适用于“session.Query”和 Cacheable()

Question

没有得到任何 QueryCacheHitCount。源代码看起来像：nHibernate 3.3.1.4000，FluentnHibernate 1.3.0.733

配置：

Factory = Fluently.Configure()
    .ExposeConfiguration(c =>
        c.SetProperty(NHibernate.Cfg.Environment.GenerateStatistics, "true"))
    .Database(
    MsSqlConfiguration.MsSql2008.ConnectionString(c => c.Is("DATA SOURCE=localhost;PERSIST SECURITY INFO=True;USER ID=AAA;Password=AAA"))
            .ShowSql()
    )
    .Mappings(x => x.FluentMappings.AddFromAssemblyOf<Localization.NHibernate.Article>())
    .ExposeConfiguration(BuildDatabase)
    .Cache(
        x => x.UseSecondLevelCache()
                .UseQueryCache()                         
                .ProviderClass<NHibernate.Cache.HashtableCacheProvider>())
    .BuildSessionFactory();

执行：

using (var tx = session.BeginTransaction())
{
    Factory.Statistics.Clear();

    for (int i = 0; i < 10; i++)
    {
        Article s = session.Query<Article>().Cacheable().Where(x => x.Name == "O").SingleOrDefault();
    }

    Console.WriteLine(Factory.Statistics.QueryCacheHitCount);
    Console.WriteLine(Factory.Statistics.SecondLevelCacheHitCount);
    Console.WriteLine(Factory.Statistics.QueryExecutionCount);
}

---

仅当我更改缓存配置并添加我的私有时才QueryCacheFactory有效.QueryCacheFactory<CacheFactory>()（但我忽略了IsUpToDate检查）

public class CacheFactory : NHibernate.Cache.IQueryCacheFactory
{
    public NHibernate.Cache.IQueryCache GetQueryCache(string regionName, NHibernate.Cache.UpdateTimestampsCache updateTimestampsCache, Settings settings, IDictionary<string, string> props)
    {
        return new MyStandardQueryCache(settings, props, updateTimestampsCache, regionName);
    }

    private class MyStandardQueryCache : NHibernate.Cache.StandardQueryCache
    {
        public MyStandardQueryCache(Settings settings, IDictionary<string, string> props, NHibernate.Cache.UpdateTimestampsCache updateTimestampsCache, string regionName)
            : base(settings, props, updateTimestampsCache, regionName) { }

        protected override bool IsUpToDate(Iesi.Collections.Generic.ISet<string> spaces, long timestamp)
        {
            return true; // SET TO TRUE than it's hitting the cache
        }
    }
}

Answer 1

我有一个类似的问题，据我记得，查询的结果是使用会话或事务的创建时间缓存的。尝试对第一个查询使用一个会话，并为以下查询使用不同的会话，这样做您应该会收到缓存命中。