What is edmx extension,what is edmodo software 8520,high blood pressure education materials online - For Begninners

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How can I give sufficient XP per session for 7 high-level PCs without encounters being a slog? How can I limit my players' options in character creation when the reason why is a spoiler? A edmx file is an XML file composed by conceptual model, storage model and mapping information between the two models. In a perfect world, your database schema would never change and your business rules would never get modified, but in the real world these things happen.
The cached execution plan used to give stored procedures a performance advantage over queries. You can add SQL functions, WHERE, and JOIN statements to a view and present the data as if the data were coming from one single table. Multicolumn unique indexes guarantee that each combination of values in the index key is unique. A non-clustered index, on the other hand, does not alter the way the rows are stored in the table. Query Processor, as the name suggests, accepts all queries submitted to SQL Server, devises a plan for their optimal execution, and then executes the plan and delivers the required results. The next step is the optimization process, which is basicallythe generation of candidate execution plans and theselection of the best of these plans according to their cost. Implement the following good practices in Stored Procedures(don't use SP_XXX, it can make conflicts with other applications. Full-Text Search in SQL Server lets users and applications run full-text queries against character-based data in SQL Server tables. Identifies a list of expansions or replacements for the terms based on matches in the thesaurus. Isolation requires that multiple transactions occurring at the same time not impact each other’s execution.
TRUNCATE TABLE is a statement that quickly deletes all records in a table by deallocating the data pages used by the table. TRUNCATE TABLE cannot used be used when a foreign key references the table to be truncated, since TRUNCATE statements do not fire triggers. DELETE TABLE statements delete rows one at a time, logging each row in the transaction log, as well as maintaining log sequence number (LSN) information.
Linq-To-Sql - use this framework if you plan on editing a one-to-one relationship of your data in your presentation layer. Entity Framework - use this framework if you plan on combining data from more than one table in your view or page.
Entity objects can be created in two ways: from a database structure, or by starting from scratch by creating a model.
If you select the below checkbox, Entity Framework generates a naming convention which adheres to plural and singular coding conventions.
EDMX (Entity Data Model XML) is an XML file which contains all the mapping details of how your objects map with SQL tables. CSDL (Conceptual Schema definition language) is the conceptual abstraction which is exposed to the application. SSDL (Storage Schema Definition Language) defines the mapping with your RDBMS data structure. In order to browse through records you can create the object of the context class and inside the context class you will get the records. For instance, in the below code snippet we are looping through a customer object collection.
For better performance, disable lazy loading when you are loading a large number of records or use stored procedures. Lazy loading is a concept where we load objects on demand rather than loading everything in one go. Now the customer object and the related address objects will be loaded in one query rather than multiple queries.
Yes, you will still need EDMX files because the context object reads the EDMX files to do the mapping. But a lot of times you want to enjoy the benefits of both worlds, you want the auto-generation part to minimize your development time and you want control on the code so that you can maintain code quality. In Code First, you have complete control on how you can create the entity and context classes. Now whenever we have concurrency issues you should get an OptimisticConcurrencyException error as shown in the below figure.
Entity Framework and do pessimistic locking by setting the isolation level in the stored procedure. Client wins and store wins are actions which you would like to take when concurrency happens. In "Server Explorer" right click on "Data Connections" and select "Create New SQL Server Database…".
Set "Server name" to ".\SQLEXPRESS" to target your local SQL Server Express installation, and enter "Blogging" for the new database name and click OK.
This command will add the necessary tables and Foreign Key relationships to your new "Blogging" database. This will bring up the Artifact Selection Screen where you can choose which Template you wish to use. On this screen select "EntityFramework POCO Code Generator" and rename your template "Blogging.tt" and click "Add". T4 stands for Text Template Transformation Toolkit, and is a template engine that ships with Visual Studio. Note that each time you edit any T4 template the dependent files are regenerated, so you shouldn’t edit the dependent files directly, or your changes will be lost.
However the strong typed ObjectContext derives from ObjectContext which is an Entity Framework class.



Since we have moved the template the relative location of the Model has changed, and we need to fix the template so its link back to the model is correct again. The classes in the Entities project are now in the "Entities" namespace rather than the "POCOWalkthru" namespace, so we need to modify the template that produces the string strongly typed context so that the generated class uses the "Entities" namespace or the class won’t compile.
Now that we are producing POCO classes it is time to verify that we can add some data to the database and get it back again using our POCO classes and the Entity Framework. To modify how the POCO entities behave you can either add a partial class to extend the class produced by the template or you can modify the templates themselves.
Modifying the T4 Template files is pretty simple, but it is beyond the scope of this basic walk through. T4 provides a mechanism by which you can write common utilities that you share across templates, in something called include files. I'd like to thank some authors who gave me the basis on which I built this application and article.
First, and maybe the most important, is Katka Vaughan's Silverlight YouTube Jukebox, which gave me some insights about how to use HTML content hosting in Silverlight in a browser. Another nice contribution was Patrick Cauldwell's MVVM: binding to Commands in Silverlight article, which allowed me to use the MVVM pattern to bind commands for some buttons in Silverlight 3. Finally, I'd like to thank our prolific writers here in The Code Project, like Daniel Vaughan and Sacha Barber. This Silverlight Class Library project just holds transfer objects (TOs) which are transferred between other projects.
From the user's point of view, it's more convenient to access Web-based applications than to install and run Windows applications. Many users don't have administrative privileges in their company machines, and installing the application might require additional technical support. Like many of WPF and Silverlight articles here in CodeProject, I also used the Model-View-ViewModel (MVVM) pattern.
As we can see from Figure 2 below, the View doesn't access the data directly; instead, it relies on the bindings provided by its ViewModel counterpart. As you may find out, I didn't pay much attention to this view, but just because I rather focused mostly on the Exam View, which is the real core of the application.
As for the buttons, the following code shows that the XAML defines two bindings: one to define which command the button will execute, and another for determining whether the button should be enabled or disabled.
As well explained by Katka Vaughan in her Silverlight YouTube Jukebox article, unfortunately, Silverlight lacked a control where you could host HTML content in your application, until the release of Silverlight 4 Beta (remember that this article deals with Silverlight 3 only). The HTML we want to put inside the HtmlHost control is just the JavaScript statements needed to run the Youtube Player. There's one more important thing about the the Exam View: usually, the YouTube player shows advertisement links and links to other YouTube videos. While reading some books about Silverlight, some authors gave me advice to create a new Silverlight Class Library project and put the controls there. Once we had the custom control class implemented, we needed to also create the template for it. Abstract: In this article, I will explain what happens behind the scenes in the Entity Data Model and also looks at the files responsible to generate the code and execute queries on your behalf. Assuming you have downloaded the code in my previous article, open your Solution Explorer and look out for a file called Model1.edmx. Logical Layer: The Logical Layer also called Storage Layer is defined by the Store Schema Definition Language (SSDL) and defines the structure of the tables and relations between them.
Mapping Layer: The Mapping Layer is defined by Mapping Specification Language (MSL) and connects the entity type definition from the CSDL to the metadata defined in the SSDL, hence the name C-S mapping. The ObjectContext class provides facilities for querying and working with entity data as objects, keeping track of the entity objects, along with the state information (added, modified, deleted) and the ability to update entities and write changes back to the database. Since the NorthwindEntities derives from ObjectContext, it contains the properties for every table included in your data model. If you look at the NorthwindEntities class, you will see it has constructors that let you connect to the database from which the model was generated.
What we are doing here is creating a new instance of the ObjectContext and implicitly establishing a connection to the database (using the constructors of the NorthwindEntities). Add a breakpoint after the foreach loop and debug the code to understand the rest of the code better. Note: An ObjectSet represents a typed entity set that is used to perform create, read, update, and delete operations. Finally, we use the cust variable to access the properties of the Orders and Customer table and write it to the console. If you are wondering where did we use the different layers of .edmx file we discussed earlier, then keep in mind that the ObjectContext class is generated, by reading the conceptual layer of the model. I hope we are making some progress here and you are able to relate the different pieces of EntityFramework and how they work together.
It's popular in Windows phone for storing some data (small count of data), also it could be used in web sites, but it has poor performance, even SQLite is better.
The way RPC marshals parameters and calls the procedure on the server side makes it easier for the engine to find the matching execution plan and simply plug in the updated parameter values.
Therefore, performance based on this feature is no longer a selling point for stored procedures. When you create a clustered index on a column (or a number of columns), SQL server sorts the table’s rows by that column(s). The Storage Engine is responsible for reading data between the disk and memory in a manner that optimizes concurrency while maintaining data integrity.
The output of this second process is called analgebrized tree, which is then sent to the Query Optimizer. Before you can run full-text queries on a table, the databaseadministrator must create a full-text index on the table. These columns can have any of the following data types: char, varchar, nchar, nvarchar, text, ntext, image, xml, or varbinary(max) and FILESTREAM.
Each transaction is said to be “atomic.” If one part of the transaction fails, the entire transaction fails.


On the other hand, if a transaction successfully executes, it will take the database from one state that is consistent with the rules to another state that is also consistent with the rules. Note that the isolation property does not ensure which transaction will execute first, merely that they will not interfere with each other.
The advantage to using TRUNCATE TABLE is that in addition to removing all rows from the table it resets the IDENTITY back to the SEED, and the deallocated pages are returned to the system for use in other areas. To make this clearer, the above terms are specific to data that will be manipulated in your view or page, not just displayed.
So rather than getting into dataset, datatables, command, and connection objects as shown in the below code, you work on higher level domain objects like customers, suppliers, etc.
At the top we have the EDMX file, followed by the TT or T4 file, and then the .CS code file. This code you can copy paste from the behind code of EF, also before disabling auto-generation. POCO is semi-automatic so you have full control on the entity classes but then the context classes are still generated by the EDMX file.
The navigation properties are automatically created from the primary and foreign key references. The "Blogging.edmx" is a Model First Entity Framework Model file for a blogging application.
For example in the model we’ve been using to date when you set a Comment's Author to a particular person the FixupCollection class insures sure that the Person's Comments collection contains the Comment too. It is possible in the EDM to have identifiers, like an EntityType name, that are reserved in the target CLR language. I only started using Silverlight in last March, and in April, I started working in a Silverlight project for my company. Katka used DivElement's HtmlHost control, so that you can embed an HTML browser in a specific region of your Silverlight interface. As some of you may know, Silverlight 4 has element binding, but Silverlight 3 still lacked this feature, so Colin's idea was more than welcome for my article. Because of them, I was encouraged to start studying Silverlight and WPF seriously, and also to learn the MVVM pattern which I used in this article.
Also, this web application holds the Silverlight-enabled WCF service that provides the Silverlight project with data services.
But I also wanted a technology that provided users with a Rich Application Interface experience, without forcing the developer to know a lot of JavaScript and CSS.
Without the ViewModel, you would have something like the usual Windows Forms paradigm, where you put code on the MyForm.cs file to retrieve data from your business or data layer and then populate the fields in the form.
It simply authenticates the user and then blocks or allows access to the rest of our YouGrade application. You may also create more users, if you wish, but you should do this by inserting users directly in the User table, because currently there is no appropriate user interface for this. And even in Silverlight 4, you could only use WebBrowser or HtmlBrush while working on Silverlight Out Of Browser applications.
In order to ensure the correct use of YouGrade, the user is not supposed to click such links and navigate away from the Silverlight application. It's a circular button which looks somewhat plastic, with a light effect on the top and a shadow effect on the bottom. Feel free to explore the different layers and study the mappings to understand them better. In return we get objects against which we can perform actions like adding new objects or deleting existing ones. User entity has scalar property of type Binary (photo) so I would like to split the User entity into User and UserPhoto. Client wins is opposite to stored wins, data from the entity object is saved to the database. Once the complex type is created, you can then reuse the complex type with other entities as well. Since the classes generated by the POCO template do their own fix-up, via the FixupCollection, customers using this template would immediately run into this bug if the generated entities that also supported change notification proxies.
Although this article doesn't explore much of the eye-candy Silverlight features such as animations, my real focus here is to provide readers with a small, working proof-of-concept that explores the use of Silverlight as part of a multimedia exam suite. The same could be said about Silverlight developers, since the Silverlight framework is a subset of the WPF foundation. In most systems, the Model part maps database tables, and the View part shows those data to the user, via Windows Forms, plain HTML, WebForms, and in the case of WPF and Silverlight, this role is played by XAML files.
But fortunately for us, DivElements company provides the HtmlHost control for free, and it works with in-browser applications, even with Silverlight 3.
In this article, I will explain how the Entity Data Model works and the files responsible to generate the code and execute queries on your behalf.
This is a good programming practice as when the execution leaves the using block, a call is made to the Dispose() method on the ObjectContext, which closes any active database connections and does critical resource cleaning for us. Once the ObjectQuery gets executed, we get the Orders results which also contains relationship to the Customer table. To support change notification proxies every property in the entity class must be virtual, so to avoid this we consciously generated non-virtual properties. The initial idea was to create a simple exam suite, but it soon evolved to a multimedia exam suite, where you can assign a video to each question in the exam, thanks to YouTube's flexibility in providing a small player which can be embedded inside your HTML (and fortunately, inside your Silverlight applications).
The ViewModel approach, on the other hand, splits the presentation layer into View and ViewModel, so that the View doesn't retrieve data from the data source anymore. Instead, each View (that is, the XAML file) has its element properties bound to specific properties in the ViewModel class. Once these bindings are set up, the View elements and ViewModel properties stay synchronized, that is, each modification in one part automatically updates the other.




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