Artist: Headhunterz
Title: Subsonic
Label: Scantraxx Reloaded
Genre: Hardstyle
Store Date: 18.02.2008
Source: Vinyl
# Tracks: 2
# Vinyls: 1
Lenght: 10:54
Quality: 320 kbps
Channels: Joint Stereo / 44 khz
Nonstop mix: no
*.cue: no
Archive size: 25 MB
Recovery record: no

Tracklist:
A1. Subsonic [5:46]
B1. Hate It Ar Love It [5:08]

Usually this error is got when Oracle express edition is used. It means, that .NET connection pool has many open connections hanging, too many for oracle.

To see how many sessions there are, log in as SYSDBA and execute this statement:

select count(*) from gv$session

Then check these two parameters in oracle:

select name, value from v$parameter where name in (‘processes’,’sessions’);

Then alter these parameters. Oracle professional has value of processes = 300. So you can increase it till this value. Commands to do that:

alter system set processes=300 scope=spfile;
alter system set sessions=300 scope=spfile;

 

This is kind of temporary solution. Usually this means that .NET program has some problems like forgotten to close connections. Or as we had using Subsonic 2.x with custom oracle provider and Subsonic.DatabaseTransaction object.

Đêm qua nằm ngủ mơ thấy bị mất dép. Hê hê, chẳng lẽ vụ mất dép ở trường Thăng Long 2 năm trước lại ám ảnh mình đến thế cơ à?

Xin xỏ cho thằng béo đi làm cùng, hi vọng là sẽ tốt đẹp, chứ cứ như thời tiết mấy hôm nay thì khốn nạn. Sáng nay lúc đi làm thì thấy nắng rực rỡ, đến Kiến Trúc xuống xe bus thì mưa ầm ầm. Hay thế, chẳng lẽ ông trời cũng học cái tính mưa nắng của em yêu?

Đêm qua, trước lúc mơ ngủ, đọc trộm được đoạn chat, có đoạn nhân vật xyz nào đó đi làm cho một công ty abc nào đó, nhân vật này đang gặp rắc rối với Insertion Sort (đúng chính tả không nhỉ). Ôi giời. Mình đi làm cũng kha khá, làm việc với một hệ thống cũng có thể coi là phức tạp, thế mà chưa bao giờ phải dùng 1 tí kiến thức về thuật toán nào. Mà tại sao lại là Insertion Sort mà không phải là Quick Sort hay Heap Sort nhỉ? Suy nghĩ một cách hướng đối tượng, tôi cần sắp xếp một tệp các dữ liệu, tôi quẳng đống dữ liệu này cho 1 đối tượng và bảo nó: Sắp xếp cái này cho tao, từ nhỏ đến lớn. Nó sẽ trả về cho tôi một tệp dữ liệu đã được sắp xếp. Đối tượng đó sắp xếp như thế nào là việc của nó, liên quan gì đến tôi? Thế cái đối tượng ấy từ đâu ra? Google, Copy and Paste.

Đấy là nói 1 cách tổng quát cho nhiều ngôn ngữ lập trình, bao gồm cả những ngôn ngữ ở mức thấp, còn trên .NET thì mọi chuyện còn điên rồ hơn một tí. Tạo ra một List rồi gọi hàm Sort.

Nếu gặp một vấn đề, chỉ có thằng ngu mới hùng hục lao vào xử lý nó ngay. Cứ từ từ, lượn qua lượn lại xem ai đó đã làm chưa. Hỏi mọi người trong nhóm, sau đó là google. 95% công việc được hoàn thành. Nếu rơi vào 5% còn lại, nghĩa là Google không có kết quả thì phải nghĩ rằng, à, cả cái thế giới này mà chưa đứa nào gặp vấn đề này thì mình làm sai mẹ nó rồi, tìm cách khác thôi .

Định dạng file mới của bộ office 2007, có đuôi thêm chữ x ở cuối như docx, xlsx,… bản chất là một file nén. Nếu đổi đuôi nó thành zip, bung nén nó ra sẽ thấy một đống file, và cái quan trọng nhất, data nằm trong một file xml. Các file xml khác chứa định dạng và các tùy chọn khác.

Phải công nhận bọn Microsoft này kinh khủng thật. Hê hê. Khéo mình thành crazy fan của nó mất thôi.

Còn thế giới mã nguồn mở cho tới giờ vẫn là một nỗi thất vọng ê chề. Java dậm chân tại chỗ khá lâu rồi. MySQL đã bị nuốt chửng, PHP thì nói làm gì cho thêm tủi, làm việc với nó vừa mỏi tay vì code vừa mỏi mồm vì chửi. Thế giới này quả có nhiều bậc pro, có thể sống sung sướng và thanh thảnh cùng cái đống mã nguồn mở điên rồ ấy.

Sắp ra .NET 4.0 và Visual Studio 2010. Ngoài ra còn có ASP.NET MVC, SubSonic, … đây là những dự án mã nguồn mở dựa trên nền .NET. Windows 7 cũng quá ngon lành.

Còn Linux thì sao? Tầm chục năm về trước, lần đầu tiên được chạm vào cái thứ gọi là máy vi tính, mình đã nghe người ta thì thầm về Linux và mã nguồn mở. Đó là mối đe dọa của Windows, đó là tương lai, đó là một đứa bé chỉ chờ để lớn lên…

Chục năm sau, đứa bé ấy vẫn là mối đe dọa, vẫn là tương lai, và vẫn đang chờ để lớn lên.

Being a SQL dev I generally poo poo most ORM tools, I want control over what SQL Server does – you know, I can squeeze so much more performance out of the queries than any mapping tool can.

However, there comes a time when maybe you just want to select some data and do that as easily as possible – most small to medium sized sites probably require basic querying and really dont need some whizzy dba to get the last drop of performance out of the db.

I have been very impressed lately by Subsonic, in particular Subsonic 3 as it introduces the best hands-off approach to databases out of all the ORM tools out there. In version 3 of this mighty tool , it comes with something called the SimpleRepository . What this does is really take away the need to worry about the database. You simply create a class to represent your object (table) and when you select, insert with that object it creates (migrations) the database objects if they are not there. It also handles changes, performaing an ALTER on the fly.

For more information on this , please visit http://subsonicproject.com

It’s hot, quiet and accurate

http://www.gunsandhunting.com/forum/blog/guysagi/index.php?showentry=330

 Sydney Suissa, executive Vice President of NGCI has spoken about this new partnership explaining that; “music is an excellent way to connect people to an important issue and inspire them to act. Nat Geo Music Channel is pleased to partner with Ben Harper and Relentless7 to increase understanding about the environmental challenges facing our planet.”

The concert will be aired on the 22^nd of April beginning at 8pm in Italy and will be broadcast on the Nat Geo Music Channel and www.natgeotv.com/earthday.

Also playing at this one-off concert is the debut performance from Bibi Tanga and the Selenites, one of the first new artists to come from the Nat Geo Music Record Label. An Italian band famous for its fusion of electronica and rock music will also be performing at the event.

The concerts carbon emissions are to be offset when the organisers will plant 1,000 trees this autumn in Rome’s Riserva della Valle dell’Aniene Park.

For more information on Ben Harper, check out his website at www.benharper.com. For more information on the event or organisers then have a look at http://worldmusicdev.nationalgeographic.com:8080/preview/view/page.basic/about.

So I’ve thrown up a couple of posts over the past couple of months regarding our use of SubSonic to provide the DAL in association with some ASP.NET MVC sites and was waylaid in my original intent to throw up a post summarizing the architecture we’re using for the effort. Well I’ve finally gotten around to it.  Recall that in his fake it till you need it post, Dave provided a window on our architecture that I’ll build upon here.

Example MVC Architecture

In the diagram above, Dave’s original concept is shown on the left for reference with my breakout to the right, similarly color coded for consistency.

The UI:

No surprises here.  ASP.NET MVC drives the show from the front end with JQuery, Dojo, or both providing the shiny bits in the browser for the users.  And since we love our unit tests (and are making strides in one of the projects to be TDD), the separation of concerns/tiers within ASP.NET MVC allows us to unit test our controllers thoroughly.

The Domain:

The domain of our architecture is actually evolving.  Our first iteration of this architecture worked with both domain objects and POCOs (plain old CLR/C# objects) in the domain layer.  I’ve included the MVC Model in the domain as well because, with some exceptions, it is holding the data required to successfully render a View…an argument can be made that it is UI as well, but that is beyond the scope of this post.   As illustrated above, a POCO is simply a data transfer mechanism while the domain object may combine one or more POCOs in new and interesting ways to be rendered by a view. Keeping domain objects and POCOs separated allows us to unit test Model and domain object logic while still letting us “fake” all of the repository and data interaction.

Later iterations of this architecture take a more DDD approach, eliminating POCOs entirely due to their tendency to push the schema up the architecture, relying instead on the IRepository to return domain objects to the Controller or Model without the middleman.  Either way, there is sufficient abstraction to fake and unit test robustly.

The Repository:

This is where Dave left us off in his original post…the ISomethingRepository. Interface based repositories do all kinds of good stuff for the architecture most notably encouraging DI/IOC patterns that allow faking of repository behavior until we actually have a bona fide need to test against a live database.  One developer can unit test his Model and Controller against:

public class FakeSomethingRepository : ISomethingRepository

And later on we’ll flip the Castle Windsor switch and hit:

public class SqlSomethingRepository : ISomethingRepository

when the system goes live.

The repository layer implementation classes are the only place where facts about the data source and the domain layer are known in the same place.  And since these classes have responsibility for data CRUD in the application, unit testing is critical and supported by the nice separation in this architecture once again.

The DAL:

This is where SubSonic takes over.  We simply point it at our database, generate a suite of DAL classes, and off we go.  In our first iteration, the tendency for SubSonic to like to work against tables proved challenging from a domain driven perspective, but as it turns out we were handed an existing schema that we were bound to anyway.  Plenty of Sql Server Views solved most problems.

So a typical repository method exercising the SubSonic DAL might look something like:

 /// <summary>
 /// Gets the customer by id performing a deep load of roles.
 /// </summary>
 /// <param name="customerId">The customer id.</param>
 /// <returns></returns>
 public UDSH.Domain.Customer GetCustomerById(int customerId)
 {
            //this passes back a user with all contained collections
            Domain.Customer result = null;

            //get the user using subsonic query
            result = DB.Select().From<Customer>().
                        Where(Customer.Customer_IdColumn).IsEqualTo(customerId).
                        ExecuteSingle<Customer>();

            if (result != null)
            {
                //attach roles
                result.Roles = GetRolesForUser(result.CustomerId);
            }

            return result;
 }

There is acutally a little more to it than that…the call to SubSonic in our live code acutally includes a call to a custom recursive function that converts a SubSonic type to a domain object on the fly.

Summary:

Thus far, this archtecture has worked out very well in our agile environment, allowing front end developers and those responsible for mid-tier and back end coding to work relatively independently without running over each other.  At the same time, it allows us to thoroughly unit test all practical areas of the application with excellent code coverage, guaranteeing quality in the finished product.  And the MVC + JQueyr or Dojo combo on the front end allows us to do some very shiny things in the UI for the user’s benefit.

Despite the convenience of using of a code generator for the DAL, it’s likely we’ll be moving away from the use of SubSonic in the future…simply to many issues start popping up with even moderately large or complex data schemas.  The heavy dependence of stored procs to do even elementary cross joins with WHERE clauses and annoying issues with DISTINCT, among other things, have moved us to look elsewhere.  That said, development has proceeded smoothly and our sites built in this manner with this technology stack run fast and right.

SubSonic – how to execute custom query using QueryCommand and read a value from single row:

string result = String.Empty;
int id = 1;
string sqlCommand = "select Col1 from Table1 where id = @IdParam";

QueryCommand cmd = new QueryCommand(sqlCommand);

// Remember to set provider name in case if multiple databases are being
// used in the current project
// (because DataService remembers the latest executed connection string)!
cmd.ProviderName = DBTable1.Schema.Provider.Name;

cmd.AddParameter("@IdParam", id, DbType.Int32);

using (IDataReader rdr = DataService.GetReader(cmd))
{
    if (rdr.Read())
    {
        result = Convert.ToString(rdr[rdr.GetOrdinal("Col1")]);
    }
    rdr.Close();
}

.NET Framework version 3.5 Service Pack 1 provides the following new features and improvements:

1) Performance improvements to WPF (Windows Presentation Foundation), including a faster startup time and improved performance for Bitmap effects. Additional functionality for WPF includes better support for line of business applications, native splash screen support, DirectX pixel shader support, and the new WebBrowser control

2) LINQ to SQL includes new support for the new date and file stream capabilities in SQL Server 2008

3) Windows Communication Foundation now makes the DataContract Serializer easier to use by providing improved interoperability support, enhancing the debugging experience in partial trust scenarios, and extending syndication protocol support for wider usage in Web 2.0 applications

4) The .NET Framework Data Provider for SQL Server (SqlClient) adds new support for file stream and sparse column capabilities in SQL Server 2008

5) ASP.NET Dynamic Data, which provides a rich scaffolding framework that enables rapid data driven development without writing code, and a new addition to ASP.NET AJAX that provides support for managing browser history (back button support).

ASPHostDirectory.com is the premier provider in ASP.NET3.5 hosting and our hosting package starts from as low as $3.99/month.

I have already written a couple of posts regarding code generation, which described how to generate C# or T-SQL code based on a database schema or table data.

My recent browsing expedition led me to T4 and SubSonic. After downloading and installing I found this introductory post on how to use SubSonic in your project.

These are the necessary steps (install-path is currently C:\Program Files\SubSonic\SubSonic 2.1 Final)

• Install SubSonic
• Modify web.config to include the SubSonic configuration section

As you need to add a provider in the SubSonicService section, make sure the chosen name is not a C# keyword, as this will cause a compilation error.

• Add a reference to the SubSonic.dll C:\install-path\SubSonic directory
• Call SubSonic SubCommander from the command line:

C:\install-path\SubCommander\sonic.exe generate
    /config \path-to-config /out \path-to-generated-source

This command creates a C# file for each table and view in your database, and wrappers for stored procedures.

Using this code, one can generate SQL statements disguised as C# code. I plan to leave my existing SQL code as it is, and write new functionality with the SubSonic framework.

I noticed that inserting records (via new Table() and .Save()) will overwrite the columns’ default values with NULL even if you do not set their values in code. You have to call the table object constructor with a true parameter to generate default values.

I still need to figure out the following questions:

• How to run a stored procedure on a newly opened connection (connections are opened and closed automatically)
• How to use SubSonic in conjunction with SqlDataSources for FormViews and GridViews

The PFX extension is used on Windows servers for files containing both the public key files (your SSL certificate files)and the associated private key (generated by your server at the time the CSR was generated).Since both the public and private keys are needed for an SSL certificate to function, a PFX backup is always needed to transfer an SSL server security certificate from one server to another.

This tutorial explains how to back up your certificate from a working server, import the certificate to a second server, and then enable the certificate for use on the new server.

This post is the continuing article about getting the SSL to work on IIS7 and in order to generate the SSL, I highly advise you to read my article about generating the CSR in IIS7 first.

Once you have the CSR, you can continue with the following steps:

1. You need to contact any SSL registrar, namely Thawte, which will be able to issue you an SSL.

2. The SSL will come in the format of .CER or .CRT file and the “appearance” or the “content” of this file looks similar with the CSR file, i.e. it is unreadable

3.  On your Windows Server 2008, click on Start, then Administrative Tools, then Internet Information Services (IIS) Manager.

4. Click on the server name.

5. From the center menu, double-click the “Server Certificates” button in the “Security” section (near the bottom of the menu).

6. From the “Actions” menu (on the right), click on “Complete Certificate Request.” This will open the Complete Certificate Request wizard.

7. Browse to your_domain_name.cer file that was provided to you by DigiCert. You will then be required to enter a friendly name. The friendly name is not part of the certificate itself, but is used by the server administrator to easily distinguish the certificate.

8. Clicking “OK” will install the certificate to the server.

Note: There is a known issue in IIS 7 giving the following error: “Cannot find the certificate request associated with this certificate file. A certificate request must be completed on the computer where it was created.” You may also receive a message stating “ASN1 bad tag value met”. If this is the same server that you generated the CSR on then, in most cases, the certificate is actually installed. Simply cancel the dialog and press “F5″ to refresh the list of server certificates. If the new certificate is now in the list, you can continue with the next step

9. Once the SSL certificate has been successfully installed to the server, you will need to assign that certificate to the appropriate website using IIS.

10. From the “Connections” menu in the main Internet Information Services (IIS) Manager window, select the name of the server to which the certificate was installed

11. Under “Sites,” select the site to be secured with SSL

12. From the “Actions” menu (on the right), click on “Bindings.” This will open the “Site Bindings” window

13. In the “Site Bindings” window, click “Add…” This will open the “Add Site Binding” window

14. Under “Type” choose https. The IP address should be the IP address of the site or All Unassigned, and the port over which traffic will be secured by SSL is usually 443. The “SSL Certificate” field should specify the certificate that was installed in step 7

15. Click “OK.”

16. Your SSL certificate is now installed, and the website configured to accept secure connections

Troubleshooting:

1. Open a web browser and visit your site using https. It is best to test with both Internet Explorer as well as Firefox, because Firefox will give you a warning if your intermediate certificate is not installed. You should not receive any browser warnings or errors. If you immediately receive a browser message about the site not being available, then IIS 7 may not yet be listening on port 443. If your web request takes a very long time, and then times out, a firewall blocking traffic on TCP port 443 to the web server

2. Note for ISA servers: If your ISA 2004 or 2006 server is not sending the intermediate certificate, you need to fully reboot the server. We have confirmed this to be true with many customers: ISA server will not properly send the intermedate certificate chain until after a full reboot
If you want to start your online e-commerce site on IIS7 environment, you can look for IIS7 hosting company that may be able to support you with the required SSL. There are few types of SSL that you need to consider and I will discuss it on my next post

Remember! An SSL is an important measurement to indicates that your site is safe and secure for online transaction. Without an SSL to protect site, your customer will be reluctant to enter his personal financial information on your site

On this post, I am going to elaborate the steps that you need to execute in order to generate the CSR (Certificate Signing Request). The CSR is an important key in SSL creation and without this, your SSL will never ever be generated properly. As you all know that the IIS7 settings and appearances are a lot different with the previous IIS6 version. All the menus and settings of IIS7 are now centralized into one big “panel” for easy access, unlike IIS6 in which every domain will have its own settings and menu.

The following are the steps to generate the CSR:

1. On your Windows Server 2008, Click Start, then Administrative Tools, then Internet Information Services (IIS) Manager.

2. Click on the server name. This is the main different with the IIS6, in which IIS7 groups all the main menus and settings on this “panel”

3. From the center menu, please find the item called “Server Certificates” in the “Security” section (it is near the bottom of the menu) and please double-click the item

4. Next, from the “Actions” menu (on the right), click on “Create Certificate Request.” This will open the Request Certificate wizard.

5. In the “Distinguished Name Properties” window, enter the information as follows:

    Common Name – The name through which the certificate will be accessed (usually the fully-qualified domain name, e.g., www.domain.com or mail.domain.com).

    Organization – The legally registered name of your organization/company.

    Organizational unit – The name of your department within the organization (frequently this entry will be listed as “IT,” “Web Security,” or is simply left blank).

    City/locality – The city in which your organization is located.

    State/province – The state in which your organization is located.

    Country/region – A country name

6. Click Next.

7. In the “Cryptographic Service Provider Properties” window, leave both settings at their defaults (Microsoft RSA SChannel and 2048 ) and then click next.

8. Enter a filename for your CSR file.
Remember the filename that you choose and the location to which you save it. You will need to open this file as a text file and copy the entire body of it (including the Begin and End Certificate Request tags) into the online order process when prompted.

If you want to start your online e-commerce site on IIS7 environment, you can look for IIS7 hosting company that may be able to support you with the required SSL. There are few types of SSL that you need to consider and I will discuss it on my next post

Remember! An SSL is an important measurement to indicates that your site is safe and secure for online transaction. Without an SSL to protect site, your customer will be reluctant to enter his personal financial information on your site .