Done as part of Webcast for Data Access with WM5.0 ...

1. Windows Mobile: Data Access and Storage Vinod Kumar M Technology Evangelist Microsoft India http://blogs.sqlxml.org/vinodkumar http://www.ExtremeExperts.com

3. Changes in SQL Mobile

7. Direct Data Management

13. SqlCeResultSet Usage (continued) string sql = "Select ProductId, Desc, Qty, UnitPrice"; SqlCeConnection conn = new SqlCeConnection(@"Data Source = rders.sdf"); SqlCeCommand commmand = new SqlCeCommand(sql, conn); SqlCeResultSet rs = commmand.ExecuteResultSet(ResultSetOptions.None); while (rs.Read()) { // retrieve column values from the current record }

15. SqlCeResultSet Updatability(continued) SqlCeResultSet rs = commmand.ExecuteResultSet(ResultSetOptions.Updatable); int idxProductId = rs.GetOrdinal("ProductId"); int idxDesc = rs.GetOrdinal("Desc"); int idxUnitPrice = rs.GetOrdinal("UnitPrice"); while (rs.Read()) { // Retrieve current values string productId = rs.GetString(idxProductId); string desc = rs.GetString(idxDesc); double unitPrice = rs.GetDouble(idxUnitPrice); // Prepend Product ID to the description rs.SetString(idxDesc, productId + " - " + desc); // Increase the price by 10% rs.SetDouble(idxUnitPrice, unitPrice * 1.1); // Apply record changes to db rs.Update(); }

17. SqlCeResultSet Scrolling Access (continued) SqlCeResultSet rs = commmand.ExecuteResultSet(ResultSetOptions.Scrollable | ResultSetOptions.Updatable ); // Read entire result backwards rs.ReadLast(); while(rs.ReadPrevious(); { // ... } // Absolute positioning rs.ReadAbsolute(10); // Read 10 records from beginning rs.ReadAbsolute(-10); // Read 10 records from end // Relative positioning rs.ReadRelative(5); // Read forward 5 records rs.ReadRelative(-5); // Read backward 5 records

19. SqlCeResultSet Databinding (continued) SqlCeResultSet rs = commmand.ExecuteResultSet(ResultSetOptions.Scrollable); listBox1.DataSource = rs.ResultSetView; listBox1.DisplayMember = "Desc"; listBox1.ValueMember = "ProductId"; textBox1.DataBindings.Add("Text", rs, "UnitPrice");

23. DataSet DataTable Serialization private void DeptComplete(string deptName, DataSet ds) { DataTable dt = ds.Tables["DeptDetail"]; dt.WriteXml(deptName + ".xml"); dt.Clear(); } private void DeptRestore(string deptName, DataSet ds) { DataTable dt = ds.Tables["DeptDetail"]; dt.Clear(); dt.ReadXml(deptName + ".xml"); }

25. DataSet Copy Method (continued) [WebMethod] public void SaveSnapshot(DataSet ds) { WriteDataSetToDatabase(ds); } private void Upload(DataSet ds) { DataServerProxy wsProxy = new DataServerProxy(); wsProxy.SaveSnapshot(ds); } Target Web Service Device call – Too slow, user must wait for whole upload

26. DataSet Copy Method (continued) private void Upload(DataSet ds) { DataServerProxy wsProxy = new DataServerProxy(); wsProxy.BeginSaveSnapshot(ds, null, null); } private void Upload(DataSet ds) { DataServerProxy wsProxy = new DataServerProxy(); DataSet dsDupe = ds.Copy(); wsProxy.BeginSaveSnapshot(dsDupe, null, null); } Device call – Changes to data during upload will corrupt upload Device call – Send copy in background, this is safe

29. DataSet Retrieving Changes from server [WebMethod] public DataSet GetLatest(DateTime startingDate) { return RetrieveChangesFromDatabase(startingDate); } private void GetUpdates(DataSet currentDs, DateTime lastUpdate) { DataServerProxy wsProxy = new DataServerProxy(); DataSet changeDs = wsProxy.GetLatest(lastUpdate); currentDs.Merge(changeDs); } Web method on server Call to web method from device

30. DataSet Sending Changes to the server [WebMethod] public void StoreUpdates(DataSet changeDs) { ApplyChangesToDataBase(changeDs); } private void SendChanges(DataSet currentDs) { DataServerProxy wsProxy = new DataServerProxy(); DataSet changeDs = currentDs.GetChanges(); wsProxy.StoreUpdates(changeDs); } Web method on server Call to web method from device

35. Connectivity and Data Transfer

38. Tools and Productivity Enhancements

41. Create New Database

42. Creating New Table

43. Automatically adds to device

47. © 2006 Microsoft Corporation. All rights reserved. This presentation is for informational purposes only. Microsoft makes no warranties, express or implied, in this summary.