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  • Include in service layer all the application's functions or only the reusable ones?

    - by BornToCode
    Background: I need to build a main application with some operations (CRUD and more) (-in winforms), I need to make another application which will re-use some of the functions of the main application (-in webforms). I understood that using service layer is the best approach here. If I understood correctly the service should be calling the function on the BL layer (correct me if I'm wrong) The dilemma: In my main winform UI - should I call the functions from the BL, or from the service? (please explain why) Should I create a service for every single function on the BL even if I need some of the functions only in one UI? for example - should I create services for all the CRUD operations, even though I need to re-use only update operation in the webform? YOUR HELP IS MUCH APPRECIATED

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  • OutOfBounds Exception when creating a PolygonShape using jbox2d

    - by B3nGr33ni3r
    So here's the deal, i'm parsing a file that contains the vertices for a polygon, that i want to create in box2d. I create a new PolygonShape() and then call .set() giving it a defined array of Vec, and that defined array's .length property. I expected this to work, since the documentation for jbox2d says this method takes a Vec array, and the count of Vec objects in that array. However, it errors out, and it seems to be unrelated to my code. The error i get is Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 8 at org.jbox2d.collision.shapes.PolygonShape.set(PolygonShape.java:174) and, upon looking at that line in the jbox2d svn repository, i still cannot figure out the issue. Any help is appreciated!

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  • Countour Mapping API

    - by Crash
    I have done some searching on Google, but haven't come up with much as of yet. I am wanting to take a set of point data, which I had previously been using to create weighted points for a heat map through the Google API, and turn them into a contour map to overlay on the Google Maps API. I haven't seen anything in Google's code that would let me do this. Does anyone know of a good API to create such an overlay? Or is there possibly something I have overlooked that Google offers?

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  • /etc/crypttab not working

    - by Jeremy Stein
    I used the Disk Utility to create an encrypted volume on an external drive. When I click the Unlock Volume button in that program, it mounts the drive for me. Now, I want to automate this process so that it will happen at boot-up. When I run sudo cryptsetup luksUUID /dev/sdb1, I get this: ca709269-1e3e-4e9e-9e08-7248f0e6c5a6 So, I create /etc/crypttab like this: backup_drive UUID=ca709269-1e3e-4e9e-9e08-7248f0e6c5a6 none And I added this line to /etc/fstab: /dev/mapper/backup_drive /mnt/backup ext3 default 0 2 When I reboot, Ubuntu tells me that the device is not available to map, so I tell it to skip it. It appears that the /etc/crypttab is not getting run correctly. How can I debug this?

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  • Diskless Workstations

    - by guettli
    I want to run diskless booting with PXE. The gotchas at the end of the Diskless-Howto[1] is quite long. I am unsure how to get this done. Here are my current possible solutions: use debian live and not ubuntu use aufs [2] The How-To states "confirmed to work with Ubuntu 12.04.". But maybe I am doing something wrong, I don't think it works this way for several diskless clients sharing one nfsroot. What is the most painless way to get diskless workstations? PS: I can't create the new tag "diskless". Please create and add it. Thank you. 1: https://help.ubuntu.com/community/DisklessUbuntuHowto 2: https://help.ubuntu.com/community/aufsRootFileSystemOnUsbFlash

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  • How do I POST XML generated to a URL in C#

    - by user2922687
    Hi guys an new to C# and i need help, am trying to send XML generated to a URL, I keep getting error with HttpWebResponse. This is my code. //POST to URL var httpRequest = (HttpWebRequest)WebRequest.Create("http://xxx.xxx.xxx.xxx:8000"); httpRequest.Method = "POST"; httpRequest.ContentType = "text/xml; charset=utf-8"; httpRequest.ProtocolVersion = HttpVersion.Version11; //Set appropriate headers var xmlWriterSettings = new XmlWriterSettings { NewLineHandling = NewLineHandling.None, Encoding = Encoding.ASCII }; using (var requestStream = httpRequest.GetRequestStream()) { xmlDoc.Save(requestStream); } using (var response = (HttpWebResponse)httpRequest.GetResponse()) using (var responseStream = response.GetResponseStream()) { // Response Code to see if the request was successful var responseXml = new XmlDocument(); responseXml.Load(responseStream); using (var repp = XmlWriter.Create("response.xml")) { responseXml.Save(repp); } }

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  • Oracle Value Chain Summit - February, 2012 Hold The Date!

    - by paul.homchick
    The Oracle Value Chain Summit brings together all of the Oracle Supply Chain products, including Product Lifecycle Management, Manufacturing, Enterprise Asset Management, Logistics,Value Chain Planning and Procurement Summit to create a comprehensive conference that includes over 200 sessions covering the entire value chain footprint. The marquee value chain event of the year, the Oracle Value Chain Summit will bring customers, partnersand industry experts together to exchange views and demonstrate the latest tools that create more connectedand efficient value chains. The Summit will focus on today’s key supply chain management challenges and feature hands-on workshops and solution demonstrations. Join us at the Hyatt Regency Embarcadero in San Francisco, February 4th through 6th. Follow this link for more information and to register for the event. Don't delay! This event is sure to sell out. 

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  • [EF + Oracle] Inserting Data (1/2)

    - by JTorrecilla
    Prologue Following EF series (I ,II y III) in this chapter we will see how to create DB record from EF. Inserting Data Like we indicated in the 2º post: “One Entity matches with a DB record, and one property match with a Table Column”. To start, we need to create an object from one of the Entities: 1: EMPLEADOS empleado = new EMPLEADOS(); Also like, I told previously, Exists the possibility to use the Static Function defined by VS for each Entity: Once we have created the object, we can Access to it properties to fill like a common class:   1: empleado.NOMBRE = "Javier Torrecilla";   After finish of fill our Entity properties, it must be needed to add the object to the appropriate ObjectSet in the ObjectContext: 1: enti.EMPLEADOS.AddObject(empleado); or 1: enti.AddToEMPLEADOS(empleado); Both methods will do the same action, create an insert statement. Have we finished? No. Any Entity has a property called “EntityState”. This prop is an Enum from “EntityState”, which has the following: Detached: the Entity is created, but not added to the Context. Unchanged: There is no pending changes in the Entity. Added: The entity is added to the ObjectSet, but it is not yet sent to the DB. Deleted: The object is deleted form the ObjectSet, but not yet from the DB. Modified: There is Pending Changes to confirm. Let’s see, the several values of the property during the Creation steps: 1. While the Object is created and we are filling the props: EntityState.Detached; 2. After adding to the ObjectSet: EntityState.Added. This not indicated that the record is in the DB 3. Saving the Data: To sabe the data in the DB, we are going to call “SaveChanges” method of the Object Context. After invoke it, the property will be EntityState.Unchanged.   What does SaveChanges Method? This function will synchronize and send all pending changes to DB. It will add, modify or delete all Entities, whose EntityState property, is setted to Added, Deleted or Modified. After finishing, all added or modified entities will be change the State to “Unchanged”, and deleted Entities must take the “Detached” state.

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  • Problems after installing Ubuntu LiveUSB on my 2nd HD

    - by user113106
    I decided to create a Ubuntu USB installer using the Universal USB Installer, selecting a Ubuntu 12.10 ISO. I selected my D: drive, my NON-windows7 carrying drive as install. After this I Re-booted my system and my PC began to Run the Ubuntu Boot-startscreen every time I power up the machine, giving errors like this: Root=Unknown I used my girlfriend's laptop to create, on the exact same way, a real! USB Ubuntu installer. Booting from that USB, picking the option Run Ubuntu from this USB I get the following error: http://postimage.org/image/63qkv98c1/ Let's try installing it from that USB to a Hard-Disk: http://postimage.org/image/usqbwymfx/ As I said: I do not have the Option to pick my Boot-section, at this very moment I can only access to the Ubuntu installation and nothing else. I've read about 90% of other Questions that could've been related, but I could not find a solution. BTW I'm running a Acer Aspire 2Quadcore 4gb DDR 2 Ati Radeon HD, 64bit and I've set my Bios OS-usage from Windows to "Others"

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  • Local LINQtoSQL Database For Your Windows Phone 7 Application

    - by Tim Murphy
    There aren’t many applications that are of value without having some for of data store.  In Windows Phone development we have a few options.  You can store text directly to isolated storage.  You can also use a number of third party libraries to create or mimic databases in isolated storage.  With Mango we gained the ability to have a native .NET database approach which uses LINQ to SQL.  In this article I will try to bring together the components needed to implement this last type of data store and fill in some of the blanks that I think other articles have left out. Defining A Database The first things you are going to need to do is define classes that represent your tables and a data context class that is used as the overall database definition.  The table class consists of column definitions as you would expect.  They can have relationships and constraints as with any relational DBMS.  Below is an example of a table definition. First you will need to add some assembly references to the code file. using System.ComponentModel;using System.Data.Linq;using System.Data.Linq.Mapping; You can then add the table class and its associated columns.  It needs to implement INotifyPropertyChanged and INotifyPropertyChanging.  Each level of the class needs to be decorated with the attribute appropriate for that part of the definition.  Where the class represents the table the properties represent the columns.  In this example you will see that the column is marked as a primary key and not nullable with a an auto generated value. You will also notice that the in the column property’s set method It uses the NotifyPropertyChanging and NotifyPropertyChanged methods in order to make sure that the proper events are fired. [Table]public class MyTable: INotifyPropertyChanged, INotifyPropertyChanging{ public event PropertyChangedEventHandler PropertyChanged; private void NotifyPropertyChanged(string propertyName) { if(PropertyChanged != null) { PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); } } public event PropertyChangingEventHandler PropertyChanging; private void NotifyPropertyChanging(string propertyName) { if(PropertyChanging != null) { PropertyChanging(this, new PropertyChangingEventArgs(propertyName)); } } private int _TableKey; [Column(IsPrimaryKey = true, IsDbGenerated = true, DbType = "INT NOT NULL Identity", CanBeNull = false, AutoSync = AutoSync.OnInsert)] public int TableKey { get { return _TableKey; } set { NotifyPropertyChanging("TableKey"); _TableKey = value; NotifyPropertyChanged("TableKey"); } } The last part of the database definition that needs to be created is the data context.  This is a simple class that takes an isolated storage location connection string its constructor and then instantiates tables as public properties. public class MyDataContext: DataContext{ public MyDataContext(string connectionString): base(connectionString) { MyRecords = this.GetTable<MyTable>(); } public Table<MyTable> MyRecords;} Creating A New Database Instance Now that we have a database definition it is time to create an instance of the data context within our Windows Phone app.  When your app fires up it should check if the database already exists and create an instance if it does not.  I would suggest that this be part of the constructor of your ViewModel. db = new MyDataContext(connectionString);if(!db.DatabaseExists()){ db.CreateDatabase();} The next thing you have to know is how the connection string for isolated storage should be constructed.  The main sticking point I have found is that the database cannot be created unless the file mode is read/write.  You may have different connection strings but the initial one needs to be similar to the following. string connString = "Data Source = 'isostore:/MyApp.sdf'; File Mode = read write"; Using you database Now that you have done all the up front work it is time to put the database to use.  To make your life a little easier and keep proper separation between your view and your viewmodel you should add a couple of methods to the viewmodel.  These will do the CRUD work of your application.  What you will notice is that the SubmitChanges method is the secret sauce in all of the methods that change data. private myDataContext myDb;private ObservableCollection<MyTable> _viewRecords;public ObservableCollection<MyTable> ViewRecords{ get { return _viewRecords; } set { _viewRecords = value; NotifyPropertyChanged("ViewRecords"); }}public void LoadMedstarDbData(){ var tempItems = from MyTable myRecord in myDb.LocalScans select myRecord; ViewRecords = new ObservableCollection<MyTable>(tempItems);}public void SaveChangesToDb(){ myDb.SubmitChanges();}public void AddMyTableItem(MyTable newScan){ myDb.LocalScans.InsertOnSubmit(newScan); myDb.SubmitChanges();}public void DeleteMyTableItem(MyTable newScan){ myDb.LocalScans.DeleteOnSubmit(newScan); myDb.SubmitChanges();} Updating existing database What happens when you need to change the structure of your database?  Unfortunately you have to add code to your application that checks the version of the database which over time will create some pollution in your codes base.  On the other hand it does give you control of the update.  In this example you will see the DatabaseSchemaUpdater in action.  Assuming we added a “Notes” field to the MyTable structure, the following code will check if the database is the latest version and add the field if it isn’t. if(!myDb.DatabaseExists()){ myDb.CreateDatabase();}else{ DatabaseSchemaUpdater dbUdater = myDb.CreateDatabaseSchemaUpdater(); if(dbUdater.DatabaseSchemaVersion < 2) { dbUdater.AddColumn<MyTable>("Notes"); dbUdater.DatabaseSchemaVersion = 2; dbUdater.Execute(); }} Summary This approach does take a fairly large amount of work, but I think the end product is robust and very native for .NET developers.  It turns out to be worth the investment. del.icio.us Tags: Windows Phone,Windows Phone 7,LINQ to SQL,LINQ,Database,Isolated Storage

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  • How do I make a subdomain of a subdomain?

    - by joe
    I have a server that hosts mydomain.com. Then I have a server that hosts subdomain1.mydomain.com. On the subdomain1.mydomain.com server, how do I make subdomains? For instance I want to create subdomain2.subdomain1.mydomain.com I have my subdomain1.mydomain.com site in /home/USER/public_html and it is working just fine. But When I try to create subdomain2.subdomain1.mydomain.com, it says Server not found in the browser. I have tried so many configurations in my /etc/hosts and /etc/apache2/sites-available/subdomain2.subdomain1.mydomain.com, without any luck Can I get some detailed instructions maybe? I have looked everywhere and every place tells you different, with no luck. Ubuntu Server 11.10 w/ the Lamp Stack option

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  • Using Enums for comparing string values in Switch

    - by kaleidoscope
    Problem Scenario: There is an enum keeping track of operations to be performed on a table Public Enum PartitionKey { Createtask, Updatetask, Deletetask } User is entering the value for the operation to be performed and the code to check the value entered in switch case. Switch (value) {           case PartitionKey.Createtask.ToString():          {          Create();          break;          }          case PartitionKey.Updatetask.ToString():          {           Update();           break;          }          case PartitionKey.Deletetask.ToString():          {           Delete();          break;          } } and it displays as error as “.” Solution: One of the possible implmentation is as below. Public Enum PartitionKey: byte { Createtask, Updatetask, Deletetask } Switch ((PartitionKey)(Int32.Parse(value))) {          case PartitionKey.Createtask:          {                   Create();                   break;          }          case PartitionKey.Updatetask:          {                    Update();                   break;          }          case PartitionKey.Deletetask:          {                    Delete();                   break;          }          default:          {                   break;          } } Technorati Tags: Enum,A Constant Value is required,Geeta,C#

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  • What&rsquo;s Wrong With This Code (#25)

    The goal: create an extension method that will make it easy to create FormCollection objects. The method is a helper for unit testing ASP.NET MVC code. public static FormCollection ToFormCollection(this object data) { var namesAndValues = data.GetType() .GetProperties() .WhereValueIsNotDefaultValue(data) .ToNameValueCollection(data); return new FormCollection(namesAndValues); } The extension method itself relies on a couple private extension...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Data Source Security Part 2

    - by Steve Felts
    In Part 1, I introduced the default security behavior and listed the various options available to change that behavior.  One of the key topics to understand is the difference between directly using database user and password values versus mapping from WLS user and password to the associated database values.   The direct use of database credentials is relatively new to WLS, based on customer feedback.  Some of the trade-offs are covered in this article. Credential Mapping vs. Database Credentials Each WLS data source has a credential map that is a mechanism used to map a key, in this case a WLS user, to security credentials (user and password).  By default, when a user and password are specified when getting a connection, they are treated as credentials for a WLS user, validated, and are converted to a database user and password using a credential map associated with the data source.  If a matching entry is not found in the credential map for the data source, then the user and password associated with the data source definition are used.  Because of this defaulting mechanism, you should be careful what permissions are granted to the default user.  Alternatively, you can define an invalid default user to ensure that no one can accidentally get through (in this case, you would need to set the initial capacity for the pool to zero so that the pool is populated only by valid users). To create an entry in the credential map: 1) First create a WLS user.  In the administration console, go to Security realms, select your realm (e.g., myrealm), select Users, and select New.  2) Second, create the mapping.  In the administration console, go to Services, select Data sources, select your data source name, select Security, select Credentials, and select New.  See http://docs.oracle.com/cd/E24329_01/apirefs.1211/e24401/taskhelp/jdbc/jdbc_datasources/ConfigureCredentialMappingForADataSource.html for more information. The advantages of using the credential mapping are that: 1) You don’t hard-code the database user/password into a program or need to prompt for it in addition to the WLS user/password and 2) It provides a layer of abstraction between WLS security and database settings such that many WLS identities can be mapped to a smaller set of DB identities, thereby only requiring middle-tier configuration updates when WLS users are added/removed. You can cut down the number of users that have access to a data source to reduce the user maintenance overhead.  For example, suppose that a servlet has the one pre-defined, special WLS user/password for data source access, hard-wired in its code in a getConnection(user, password) call.  Every WebLogic user can reap the specific DBMS access coded into the servlet, but none has to have general access to the data source.  For instance, there may be a ‘Sales’ DBMS which needs to be protected from unauthorized eyes, but it contains some day-to-day data that everyone needs. The Sales data source is configured with restricted access and a servlet is built that hard-wires the specific data source access credentials in its connection request.  It uses that connection to deliver only the generally needed day-to-day information to any caller. The servlet cannot reveal any other data, and no WebLogic user can get any other access to the data source.  This is the approach that many large applications take and is the reasoning behind the default mapping behavior in WLS. The disadvantages of using the credential map are that: 1) It is difficult to manage (create, update, delete) with a large number of users; it is possible to use WLST scripts or a custom JMX client utility to manage credential map entries. 2) You can’t share a credential map between data sources so they must be duplicated. Some applications prefer not to use the credential map.  Instead, the credentials passed to getConnection(user, password) should be treated as database credentials and used to authenticate with the database for the connection, avoiding going through the credential map.  This is enabled by setting the “use-database-credentials” to true.  See http://docs.oracle.com/cd/E24329_01/apirefs.1211/e24401/taskhelp/jdbc/jdbc_datasources/ConfigureOracleParameters.html "Configure Oracle parameters" in Oracle WebLogic Server Administration Console Help. Use Database Credentials is not currently supported for Multi Data Source configurations.  When enabled, it turns off credential mapping on Generic and Active GridLink data sources for the following attributes: 1. identity-based-connection-pooling-enabled (this interaction is available by patch in 10.3.6.0). 2. oracle-proxy-session (this interaction is first available in 10.3.6.0). 3. set client identifier (this interaction is available by patch in 10.3.6.0).  Note that in the data source schema, the set client identifier feature is poorly named “credential-mapping-enabled”.  The documentation and the console refer to it as Set Client Identifier. To review the behavior of credential mapping and using database credentials: - If using the credential map, there needs to be a mapping for each WLS user to database user for those users that will have access to the database; otherwise the default user for the data source will be used.  If you always specify a user/password when getting a connection, you only need credential map entries for those specific users. - If using database credentials without specifying a user/password, the default user and password in the data source descriptor are always used.  If you specify a user/password when getting a connection, that user will be used for the credentials.  WLS users are not involved at all in the data source connection process.

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  • proper model for a multi site rails app

    - by JeffTaggarty
    Hi Guys, I am not sure if this is correct place to ask this question. My apologies if it is not. I need to create a web app where people will sign up, call it main-app.com, when they sign up my code will generate a usersite.my-app.com, they will login and only be able to manage their mini site. My question is, is it correct to model this out by creating a table for site, a table for user, users belong to site and site has many users. Then I should create a content table that belongs to user AND site? is that right? Thanks Jeff

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  • Creating sites with local ips that pointing to a distant server.

    - by fatnjazzy
    Hi. We are a company that is distributed in several places over Europe (real offices). Each office has its own domain. company.de company.co.uk company.ch And so. Our website servers are located in one place. We can't distribute our site to different locations. How can we create a local IP in each location to show our main server. so google will see us as local ip. Explanation: Google has decided to increase your PR if you have a local IP, they think that if you bought a server in a local market means that you are very serious about your business. We have 8 employees in each office, we cant have a separate server, is that mean that we are not serious about our business? no, this is y i need to create this illusion. Thanks

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