我必须在数据库中记录 Web 服务调用。一开始，我使用code first EF来定义Entity类并生成数据库脚本。数据库部分很简单，只有一张表。有一个主键：Id，其他列是字符串、日期时间和浮点数。总共16列。
然后我跑了VS2012的性能分析。报告显示 RecordUsageEF 消耗了整个调用的一半时间，这很荒谬。我尝试了 MergeOption.NoTracking 选项和预生成视图（如何：预生成视图以提高查询性能）。但他们并没有太大帮助。
然后我尝试了 Ado.net。我将 sql 脚本放在源代码中只是为了测试。一起调用 2 个方法来比较性能。
public static void RecordUsage(HttpContext httpContext, XmlWDCRecipe processedRecipe, string orgRecipe, string userName, ActionEnum action, bool trueview, string pageId)
{
RecordUsageEF(httpContext, processedRecipe, orgRecipe, userName, action, trueview, pageId);
RecordUsageADO(httpContext, processedRecipe, orgRecipe, userName, action, trueview, pageId);
}
结果让我吃惊：
使用静态 EF 上下文更新改进了一些：
RecordUsageEF 内部：
更新了 RecordUsageEF 内部——静态上下文
更新刚刚实现默认性能是CPU采样，这里是选择Instrumentation时的结果
还不错，但如果 CPU 是网站/网络服务的瓶颈。EF看起来不是很好的选择。
我在 sql profiler 中检查了 EF 生成的脚本。这是一个非常简单的插入 sql 语句，它比 Ado.net 运行得更快。
EF有什么我错过的吗？如果它在这种性能级别，我不能使用 EF。
这是源代码。
英孚版：
public static readonly LogContainer container = new LogContainer();
private static void RecordUsageEF(HttpContext httpContext, XmlWDCRecipe processedRecipe, string orgRecipe, string userName, ActionEnum action, bool trueview, string pageId)
{
{
container.Usages.MergeOption = System.Data.Objects.MergeOption.NoTracking;
using (LookupService ls = new LookupService(httpContext.Server.MapPath(geoDBLocation), LookupService.GEOIP_MEMORY_CACHE))
{
//get country of the ip address
Location location = s.getLocation(httpContext.Request.UserHostAddress);
Usage usage = new Usage()
{
Brand = brand,
Action = action.ToString(),
ExecuteDate = DateTime.Now,
OutputFormat = trueview ? Path.GetExtension(processedRecipe.Output.trueview_file) : Path.GetExtension(processedRecipe.Output.design_file),
Recipe = orgRecipe,
SessionId = pageId,
Username = userName,
ClientIP = httpContext.Request.UserHostAddress,
ClientCountry = location == null ? null : location.countryName,
ClientState = location == null ? null : location.regionName,
ClientCity = location == null ? null : location.city,
ClientPostcode = location == null ? null : location.postalCode,
ClientLatitude = location == null ? null : (double?)location.latitude,
ClientLongitude = location == null ? null : (double?)location.longitude,
UserAgent = httpContext.Request.UserAgent
};
//container.AddToUsages(usage);
container.Usages.AddObject(usage);
container.SaveChanges(System.Data.Objects.SaveOptions.None);
}
}
}
EF 设置为默认值：
ado.net 版本：
private static void RecordUsageADO(HttpContext httpContext, XmlWDCRecipe processedRecipe, string orgRecipe, string userName, ActionEnum action, bool trueview, string pageId)
{
using (SqlConnection conn = new SqlConnection("data source=pgo_swsvr;initial catalog=OESDWebSizer;user id=sa;password=sa;MultipleActiveResultSets=True;"))
{
using (LookupService ls = new LookupService(httpContext.Server.MapPath(geoDBLocation), LookupService.GEOIP_MEMORY_CACHE))
{
//get country of the ip address
//test using "203.110.131.5" "58.63.236.236"
//httpContext.Request.UserHostAddress
Location location = ls.getLocation(httpContext.Request.UserHostAddress);
SqlCommand command = new SqlCommand();
conn.Open();
command.Connection = conn;
command.CommandType = System.Data.CommandType.Text;
command.CommandText = @"insert into Usages ([Brand],[Username],[SessionId],[Action],[Recipe],[ExecuteDate]
,[OutputFormat],[ClientIP],[ClientCountry],[ClientState],[ClientCity],[ClientPostcode]
,[ClientLatitude],[ClientLongitude],[UserAgent])
Values ('" + brand + "',"
+ (string.IsNullOrEmpty(userName) ? "NULL" : "'" + userName + "'") + ", '" + pageId + "', '" + action.ToString() + "', '" + orgRecipe + "', '" + DateTime.Now.ToString("yyyyMMdd") + "', '"
+ (trueview ? Path.GetExtension(processedRecipe.Output.trueview_file) : Path.GetExtension(processedRecipe.Output.design_file)) + "', '"
+ httpContext.Request.UserHostAddress + "', '"
+ (location == null ? string.Empty : location.countryName) + "', '"
+ (location == null ? string.Empty : location.regionName) + "', '"
+ (location == null ? string.Empty : location.city) + "', '"
+ (location == null ? string.Empty : location.postalCode) + "', "
+ (location == null ? 0 : (double?)location.latitude) + ", "
+ (location == null ? 0 : (double?)location.longitude) + ", '"
+ httpContext.Request.UserAgent + "')";
command.ExecuteNonQuery();
}
}
}