Performance is enhanced with an optimizing query processor. A range of data types is supported to ensure flexibility, and bit encryption is provided on the device for database file security. Flexible data access. SQL Server CE enables straightforward, efficient access to enterprise data whether a device is always connected or intermittently connected to the computer running SQL Server.
Remote data access exposes data in SQL Server 6. This approach ensures data can be accessed reliably and flexibly, even through firewalls. Obtain and install Microsoft eMbedded Visual Tools 3. These are included in the eMbedded Visual Tools 3.
Version Japanese version Note: Because there is no emulator available, the readme file contains information on how to purchase and set up a CEPC for development of Handheld PC applications.
Ensure that you have Microsoft ActiveSync 3. Verify that you have Administrator rights on the target system and that the Administrators group has Change permission on the installation directory. Note that all versions use English during setup, but will install localized Microsoft Data Access Components 2. Read the End User License Agreement. Visual Studio. NET and the. NET Compact Framework for managed application development. Support the Site HPC:Factor believes that the Internet is a better place without the constant displaying of adverts on community website resources and as such does not carry 'ad-words', banners, pop-up's or any other form of paid advertising.
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The next release of Visual Studio. NET code-named "Everett" will provide native support for the. NET 4x devices.
This password must be passed each time the database is opened. When creating a new database, this property can be utilized to specify a password that must be used. Intrinsic functions that you've come to know and love in SQL Server are now supported.
Now you can use mathematical, string, and system functions in your queries to perform operations and return scalar values. For example, Figure 2 demonstrates how to convert a column to a char 50 column, in order to make the results in the ListBox easier to format. This feature is also available to developers using eMbedded Visual Tools 4. Those of you who are familiar with parameterized queries in SQL Server will note that there are some differences.
Since there is no built-in mechanism for storing queries in SQL Server CE, the parameters are actually placeholders "? Index pull is another new feature. Using pull in applications can track the changes made on a SQL Server CE table by setting the appropriate tracking options. As you may have noticed in some of the previous code fragments, applications that are written in Visual Basic.
NET and C using the. If you've written any desktop applications using Visual Studio. NET, you're probably already familiar with this style of exception handling. Developers who have been confined to using the On Error GoTo style of error handling in eMbedded Visual Basic will really appreciate this new language feature. While you are debugging your application, you can deploy the DLL with the application.
Once you have completed debugging your application, you can remove the DLL from the device. Using the connectivity wizard, you can create and manage virtual directories on a computer running Microsoft Internet Information Services IIS.
As with the previous version of SQL Server CE, you can now help protect the security of the local database either by using a password or by using a password along with bit encryption. Using a password on the local database will prevent programmatic access to the local database, but it will not prevent any data from being read as clear text from the database file. Using a password and encryption together will prevent programmatic access and will store user data in an encrypted form.
If you are not using Pocket PC , you will need to download the high-encryption pack.. Microsoft plans to add Kerberos support in future versions of Windows CE. NET 4. This will allow for the delegation of credentials between a Windows or. NET devices. Once Windows CE. The initial release maxed out at 32 indices, whereas this latest release now supports indices. This is implemented as a managed wrapper and allows applications to talk directly to the back-end SQL Server database.
This should probably only be used in well-connected scenarios where your mobile device has a persistent network connection, and where you don't have a requirement for local data storage.
This made it difficult to write queries unless you had the entire schema memorized. Now you can view your database objects in a tree-view, much like in the desktop version of SQL Query Analyzer. See Figure 6 for an architecture diagram of these two connectivity options. Your application can then read and update the local database table. Using this information, the application can later push the changed records from the local table back to the SQL Server table.
To reduce the amount of transmitted data, RDA uses compression. This makes RDA well suited to wireless transports. Optionally, encryption can be used to help safeguard sensitive user data.
RDA also has a mechanism to handle communication failures. If a failure should occur, retransmission will resume from the last successfully transmitted message buffer. RDA access is provided by a Visual Studio. Using Merge Replication enables data to be updated independently on the device and the server. This data can then be synchronized when the device is later connected to the server. Before you can create a subscription, you must configure SQL Server replication, create the SQL Server publication, including setting up a shared snapshot folder to store published data, and then enable the publication for anonymous subscriptions.
The SQL Server CE Replication object has methods for adding and dropping subscriptions and for initializing, invoking, and terminating Merge Replication on a subscription. SQL Server Replication is more sophisticated and more complex than RDA, although not difficult to program once it has been correctly configured. NET and C mobile applications using the. If you already use ADO. NET application can run side-by-side on the same device.
It just means that applications written using either platform can co-exist on the same device. Two new namespaces were added to support managed code using the. These are: System. SqlClient and System. Also a class called System. NET and C. To describe the power of the new managed code wrapper using Merge Replication in your application, a single call to the Synchronize method will bring the entire database schema and underlying data down to a device without having to write a single line of data description language DDL.
NET and the. We'll deploy the application to the Pocket PC emulator to simplify development and testing. For the purposes of this example, we'll use a database that is created when you install the NorthwindCE sample application that comes with the. We will instruct our example application to subscribe to this same publication. If all goes well, you should see that the publication has been successfully created, as shown in Figure 7.
Synchronize method. Figure 8 shows the Windows Form that we've designed for our SmartDevice application. The application allows us to query the Employees table of the local subscription database by entering a portion of the Last Name, and it will return the results in a ListView control. SmartDevice may not be a thrilling application, but the way we get there is very interesting! Before we get started, we'll assume that you've run the SetupRepl.
It first creates an empty subscription database if it doesn't already exist and then calls DBSync to synchronize the publication database to the subscription database see Figure 9. In our DBSync method, we've hardcoded all of the properties of the Replication object for illustrative purposes only.
You would obviously want to maintain these in some sort of application-defined store, such as a SQL table or an XML file. We're using SQL Server authentication in our example. The Synchronize method creates the subscription database and brings down the entire schema for all database objects in the publication, including related indices, as shown in Figure
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