Viewing the Pulled Schema in .NET

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8323 Viewing the Pulled Schema
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If you use RDA to retrieve data from the desktop and you plan to propagate local changes to that data back to the desktop server, you must specify one of the change-tracking enumerations in the fourth parameter when you pull the data Two of the tracking options also specify that indexes are to be created on the local table The TrackingOnWithIndexes option adds yet one more index to your table Do your own performance testing to determine whether your application benefits from the indexes Using either tracking option adds the two extra columns shown in Figure 85 to your database Using the TrackingOnWithIndexes option adds the extra index also shown in Figure 85
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83 Using RDA
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Figure 85: A Table Pulled with Tracking and Indexes
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8324 Modifying Pulled Data Locally
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The connection to SQL Server is open only while the data is being pulled When the data has been transferred to the SQL Server CE data table, the SQL Server connection is closed Once you have pulled the data and, if necessary, altered the IDENTITY property, you can modify the data locally using the techniques covered in 6 and illustrated in Listing 83
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Listing 83: Modifying Pulled Data at the Device
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private void mitemUpdate_Click(object sender, EventArgs e) { SqlCeConnection connLocal = new SqlCeConnection(strConnLocal); connLocalOpen(); SqlCeCommand cmndLocal = new SqlCeCommand(); try { cmndLocalConnection = connLocal; cmndLocalCommandText = "UPDATE Categories " + " SET CategoryName = 'new Name' " WHERE CategoryID = 2"; cmndLocalExecuteNonQuery(); cmndLocalCommandText =
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"DELETE Categories WHERE CategoryID = 3"; cmndLocalExecuteNonQuery(); cmndLocalCommandText = "INSERT Categories (CategoryName) " + " VALUES ('new Category I') "; cmndLocalExecuteNonQuery(); } catch( SqlCeException exSQL ) { HandleSQLException(exSQL); } finally { cmndLocalDispose(); connLocalClose(); } }
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Figure 86 shows the Categories data after modification The row for CategoryID = 3 has been deleted, the row for CategoryID = 2 has been modified, and a new row with CategoryID = 10 has been added The inserted and modified rows are marked in the s_Operation column; the deleted row is represented in the MSysRDATombstone table
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Figure 86: The Categories Table after Updates
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83 Using RDA 8325 Pushing Data
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To propagate the table s changes back to the desktop SQL Server, you use the Push method of the SqlCeRemoteDataAccess class This is shown in Listing 84
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Listing 84: An RDA Push
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private void mitemPush_Click(object sender, EventArgs e) { // Create an RDA object SqlCeRemoteDataAccess rdaNW = new SqlCeRemoteDataAccess(); try { // Have RDA: // Create local tables named Categories and // ErrorCategories // Connect to the remote server and submit // the changes rdaNWLocalConnectionString = strConnLocal; rdaNWInternetUrl = strURL; rdaNWInternetLogin = ""; rdaNWInternetPassword = ""; rdaNWPush("Categories", strConnRemote); } catch( SqlCeException exSQL ) { HandleSQLException(exSQL); } finally { rdaNWDispose(); } }
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After the Push method completes, you can detect the rows that failed to update at the server due to concurrency conflicts by accessing the local table that was specified as a Pull method parameter In our case, this was the ErrorCategories table, shown in Figure 810, specified as the last parameter in the following code snippet extracted from Listing 81
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rdaNWPull("Categories", "SELECT CategoryID, CategoryName " + " FROM Categories", strConnRemote, RdaTrackOptionTrackingOnWithIndexes, "ErrorCategories");
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Figure 87 shows the contents of the Categories table that we pulled to the local database When we push the changes back to the SQL Server database, using the code in Listing 84, the following activities occur 1 The modified row from our local database is modified on the server 2 The deleted row in our local database fails to delete because of a foreign key violation; there are some Confections products in the remote database, so the category cannot be deleted 3 The inserted row from our local database fails to insert because a CategoryId = 10 row already exists in the remote database Perhaps some other user added this row; perhaps we added it with a SubmitSQL method call This can be verified by viewing the contents of the Categories table on the server after the push has completed, as shown in Figure 88 When the Push method executed, it raised the exception shown in Figure 89 As a result of the exception, the rows shown in Figure 810 were added to the SQL Server CE ErrorCategories table
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