servicestack - 超时已过。 - 在 ServiceStack 服务中使用 Db

Question

我正在使用 Db ServiceStack 服务中的属性来访问我的数据库，但我不时从 IIS 收到以下错误:
Timeout expired. The timeout period elapsed prior to obtaining a connection from the pool. This may have occurred because all pooled connections were in use and max pool size was reached.
堆栈跟踪:

[InvalidOperationException: Timeout expired.  The timeout period elapsed prior to obtaining a connection from the pool.  This may have occurred because all pooled connections were in use and max pool size was reached.]
   System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) +6371713
   System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) +6372046
   System.Data.SqlClient.SqlConnection.Open() +300
   ServiceStack.OrmLite.OrmLiteConnection.Open() +44
   ServiceStack.OrmLite.OrmLiteConnectionFactory.OpenDbConnection() +132
   ServiceStack.ServiceInterface.Service.get_Db() +68

我已经设置了 ReuseScope在 Configure方法 ReuseScope.None我相信哪个应该在每个请求的基础上关闭连接？我在这里做错了什么？

public override void Configure(Container container)
{
    JsConfig.EmitCamelCaseNames = true;

    //Register all your dependencies
    ConfigureDb(container);

    //Set MVC to use the same Funq IOC as ServiceStack
    ControllerBuilder.Current.SetControllerFactory(new FunqControllerFactory(container));
}

配置数据库:

private static void ConfigureDb(Container container)
{
    var connectionString = ConfigurationManager.ConnectionStrings["AppDb"].ConnectionString;
    container.Register<IDbConnectionFactory>(c =>
        new OrmLiteConnectionFactory(connectionString, SqlServerDialect.Provider))
        .ReusedWithin(ReuseScope.None);

    using (var db = container.Resolve<IDbConnectionFactory>().Open())
    {
      // Do database seed/initialisation
    }
}

编辑

经过更多的诊断，当我调用这个服务方法多次刷新页面时，似乎会发生这种情况:

public Warranty Get(Warranty request)
    {
        var warranty = new Warranty();
        if (request.Id != default(int))
        {
            warranty = Db.Id<Warranty>(request.Id);
            warranty.WarrantyOrder = ResolveService<WarrantyOrderService>().Get(new WarrantyOrder { WarrantyId = warranty.Id });
            warranty.WarrantyStatus = ResolveService<WarrantyStatusService>().Get(new WarrantyStatus { Id = warranty.StatusId });
            warranty.WarrantyNotes = ResolveService<WarrantyNoteService>().Get(new WarrantyNotes { WarrantyId = warranty.Id });
            warranty.WarrantyDialogues = ResolveService<WarrantyDialogueService>().Get(new WarrantyDialogues { WarrantyId = warranty.Id });
            warranty.WarrantyCredit = ResolveService<WarrantyCreditService>().Get(new WarrantyCredit { WarrantyId = warranty.Id });
            warranty.WarrantyPhotos = ResolveService<WarrantyPhotoService>().Get(new WarrantyPhotos { WarrantyReference = warranty.WarrantyReference });
            warranty.WarrantyReport = ResolveService<WarrantyReportService>().Get(new WarrantyReport { WarrantyId = warranty.Id });
        }

        return warranty;
    }

我改了 ConfigureDb根据下面的@mythz 回答:

    private static void ConfigureDb(Container container)
    {
        var connectionString = ConfigurationManager.ConnectionStrings["AppDb"].ConnectionString;
        container.Register<IDbConnectionFactory>(c => new OrmLiteConnectionFactory(connectionString, SqlServerDialect.Provider));
    }

该服务需要调用其他服务来填充我 Warranty 上的其他对象对象，我不确定如何改进？

Answer 1

IDbConnectionFactory像所有连接管理器一样是线程安全的 工厂创建数据库连接，即它本身不是数据库连接。它应该被注册为单例。

默认情况下，ServiceStack 的 IOC (Funq) 默认注册为 Singleton，因此正确的注册是:

container.Register<IDbConnectionFactory>(c =>
    new OrmLiteConnectionFactory(connectionString, SqlServerDialect.Provider));

解析服务

由于 ServiceStack 服务具有利用托管资源的潜力，因此无论何时从另一个服务解析它们，都应该在 using 语句中使用它们，以便适本地处理它们，例如:

using (var orders = ResolveService<WarrantyOrderService>())
using (var status = ResolveService<WarrantyStatusService>())
{
    var warranty = new Warranty { 
        WarrantyOrder = orders.Get(new WarrantyOrder { WarrantyId = warranty.Id }),
        WarrantyStatus = status.Get(new WarrantyStatus { 
            WarrantyId = warranty.StatusId }),
       //etc
    }       

    return warranty; 
}