好吧,我知道我必须在这里做错事,因为我得到的表现时间是如此不同,令人震惊.我一直在考虑在我现有的项目中使用实体的代码优先选项,所以我一直在尝试进行一些性能测试,看它是如何比较的.我正在使用MSpec对远程开发数据库运行测试.
这是我的测试:
public class query_a_database_for_a_network_entry_with_linq : ipmanagement_object { protected static NetINFO.IPM_NetworkMaster result; Because of = () => { var db = new NetINFODataContext(); result = db.IPM_NetworkMasters.SingleOrDefault(c => c.NetworkID == 170553); }; It should_return_an_ipm_networkmaster_object = () => { result.ShouldBeOfType(typeof(NetINFO.IPM_NetworkMaster)); }; It should_return_a_net_ou_object_with_a_networkid_of_4663 = () => { result.IPM_OUIDMaps.First().NET_OU.NET_OUID.ShouldEqual(4663); };
}
public class query_a_database_for_a_network_entry_with_entity_code_first : ipmanagement_object { protected static NetInfo.Core.Models.CTP.IPM_NetworkMaster result; Because of = () => { NetInfo.Core.Models.CTP.NetInfoDb db = new NetInfo.Core.Models.CTP.NetInfoDb(); result = db.IPM_NetworkMasters.SingleOrDefault(c => c.NetworkID == 170553); }; It should_return_an_ipm_networkmaster_object = () => { result.ShouldBeOfType(typeof(NetInfo.Core.Models.CTP.IPM_NetworkMaster)); }; It should_return_a_net_ou_object_with_a_networkid_of_4663 = () => { result.NET_OUs.First().NET_OUID.ShouldEqual(4663); }; }
正如您从datacontext中看到的linq-to-sql我无法直接访问具有多对多关系的对象.我必须使用中间查找表.这是我喜欢的Entity框架之一.但是,当我运行这些测试时,linq测试永远不会超过4秒完成(数据库是远程的).实体测试每次耗时近8秒.不确定为什么会有这么大的差异?以下是我的POCO类和我的dbcontext的摘录:
的DbContext:
public class NetInfoDb : DbContext { public NetInfoDb() : base("NetINFOConnectionString") { } public DbSet<IPM_NetworkMaster> IPM_NetworkMasters { get; set; } public DbSet<IPM_NetworkType> IPM_NetworkTypes { get; set; } public DbSet<NET_OU> NET_OUs { get; set; } protected override void OnModelCreating(System.Data.Entity.ModelConfiguration.ModelBuilder modelBuilder) { modelBuilder.Entity<IPM_NetworkMaster>() .HasMany(a => a.NET_OUs) .WithMany(b => b.IPM_NetworkMasters) .Map(m => { m.MapRightKey(a => a.NET_OUID,"NET_OUID"); m.MapLeftKey(b => b.NetworkID,"NetworkID"); m.ToTable("IPM_OUIDMap"); }); } }
IPM_NetworkMaster:
public class IPM_NetworkMaster { public int NetworkID { get; set; } <snip> public virtual ICollection<NET_OU> NET_OUs { get; set; } }
NET_OU:
public class NET_OU { public int NET_OUID { get; set; } <snip> public virtual ICollection<IPM_NetworkMaster> IPM_NetworkMasters { get; set; } }
解决方法
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