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To copy the download to your computer for installation at a later time, click Save or Save this program to disk. Registering will help the developers in getting information about SQL Server Compact critical security patches and hot fixes that can be further applied to the client installations.
In this sample, data is written back to the database inside the Closing event handler. Only if changes are found in the DataSet is it necessary to commit changes back to the database. When you are using a strongly typed DataSet , lots of code is generated for you, and once the DataSet is initialized, retrieving data is very fast. Basically, the only code you have to provide is code to commit changes back to the database. Additionally, you might want to add code to navigate through the data, and provide a non-default way to fill the DataSet , maybe filtering the data you are interested in.
In this introduction in using DataSet s, we omitted some more advanced topics like delay-loading data from the database to the DataSet.
How to use SQL Server Compact in Windows Phone without Linq to SQL - Stack Overflow
Some code is generated for you, although not as much as you saw when using a strongly typed DataSet. One of the big advantages of a SqlCeResultSet is that it operates directly on the database. In other words, data is not duplicated, which is great on a memory scarce device like a Windows Mobile device. To compare the performance between a SqlCeResultSet and a DataSet , we are going to use a similar application, working on the same tables of the Northwind database and providing the same functionality.
Performance is again measured through a Stopwatch object. In figure 4, you can see in the Properties window that we specified a custom tool to generate a strongly typed SqlCeResultSet instead of a DataSet. The initial approach is identical. You add a DataSource to your project, being the Northwind database.
What you can see in figure 4 is that Visual Studio created two strongly typed SqlCeResultSet s for you, but that there is no relation between the two. In order to have a master-detail view on the MainForm , you must provide your own code to bind the detail view to the master view. The code that Visual Studio generates for you to be able to display data on the MainForm is shown in listing 1.
Note that only the data grid containing Orders data is populated automatically by Visual Studio Also, no additional forms are generated to display summary information or an edit dialog. You can do that by right clicking on the Northwind. Visual Studio opens a new file Northwind. A new constructor is created with a boolean flag, indicating if the Order Details table needs to be opened or not.
In this whitepaper, we are not optimizing the database at all by providing additional indexes, to have a real comparison between the performance of a DataSet and a SqlCeResultSet. However, adding indexes might even give you better performance. The first thing to do is make sure that you will bind the User Interface controls that you are using for the detailed view to a new BindingSource. This works fine for the Order ID field, since this is a key value, used in both tables. You can now specify that you want to use the just added binding source, which fixes the data binding problem we just described.
The next thing you need to do is provide code to show detailed information for the currently selected record inside the data grid. Each time the user selects a new record in the DataGrid that is shown in Figure 6, you need to find out what the Order ID is of the currently selected record. Using that Order ID, you can then build a query to retrieve order details from the Order Details table.
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Listing 6 shows you a method that connects the Orders table to the Orders Details table through code. This code can be called each time the current record in the data grid changes. This event can be used to retrieve the currently selected Order ID. When you read about the DataSet , you also noticed that the designer can create Summary and Edit forms for you. If you want that functionality, you have to create your own forms and provide your own code to populate those forms.
In this article, this functionality is omitted for the SqlCeResultSet since we are only focusing on performance during data retrieval. Since a SqlCeResultSet immediately operates on the database, changes will be immediately committed for you. This functionality is similar to the DataSet. Figure 7 shows you these performance results when using a strongly typed SqlCeResultSet. As you can see, it takes around milliseconds on the Device Emulator from the time the application is initialized to the time the data is displayed to the user.
Moving from one record to another, updating, especially the detailed information, takes an average of 50 milliseconds. You can also see the amount of time it takes to move from the first record to the last record, which is a little longer, since more records have to be evaluated in order to move from the first to the last record. Making use of strongly typed DataSets in your application is very easy to do. You hardly have to provide any code, since most code can be generated for you by Visual Studio Especially in the case of a master — detail presentation, this is very convenient.
Resources on using SQL Server Compact with Windows Phone
However, since all data from the database is duplicated in memory, it will take more time to initially display your form, and you will use up precious memory on your Windows Mobile device. SqlCeResultSet gives you much better performance, especially when initially loading your form. The reason for this is that the SqlCeResultSet works directly on the database, and only needs to retrieve records that are visible in the DataGrid.
However, to implement a master — view presentation, you have to provide more code yourself. The speed of SqlCeResultSet can be even more improved by making use of index files on the database. However, the improved performance is definitely worth investing in a bit of code to get that functionality available inside your own application.
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Stats Licenced Ms-PL. Windows Mobile App Development Part 5: Rate this: Please Sign up or sign in to vote. Introduction Developing applications for Windows Mobile devices is similar to developing applications for the desktop, especially if you make use of either Visual Basic.
SQL Server Mobile 3. Figure 1 - Strongly Typed DataSets. Figure 3 - Initial time it takes to display data and move from record to record. Figure 7 - Initial time it takes to display data and move from record to record. Maarten Struys is an experienced software developer. He has been working with all Microsoft Windows Operating Systems for over 20 years both developing native applications and, since , developing managed applications.
For information about how to use. NET in the embedded world, see Maarten's Web site at http: Public, Private, and Hybrid Cloud: What's the difference? A Solution Blueprint for DevOps. Windows Mobile App Development Part 3: