Data Access Mobile Devices

Mobile Data with the Compact Framework Shawn Wildermuth Senior Consultant/Architect Magenic Technologies

Who I Am ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Agenda ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

How Mobile Data is Different ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Deciding on a Solution ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Limitations of the CF ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Limitations of the CF (2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Limitations of the CF (3) ,[object Object],[object Object],[object Object]

SQL Client Data Access ,[object Object],[object Object],[object Object],// Create the connection and command SqlConnection conn = new SqlConnection("..."); SqlCommand cmd = conn.CreateCommand(); cmd.CommandText = "SELECT * FROM Customers"; // Create a DataSet to put our results in DataSet ds = new DataSet(); // Create the adapter SqlDataAdapter da = new SqlDataAdapter(cmd); // Fill it da.Fill(ds, "Customers");

SQL Client Data Access (2) ,[object Object],[object Object],[object Object],// Create the connection and command SqlConnection conn = new SqlConnection("..."); SqlCommand cmd = conn.CreateCommand(); cmd.CommandText = "SELECT * FROM Customers"; // Use a Reader try { conn.Open(); SqlDataReader rdr = cmd.ExecuteReader(); while (rdr.Read()) { string name = rdr["CompanyName"].ToString(); } } finally { conn.Close(); }

SQL Server CE CLIENT SERVER QP/Cursor Engine/ES Storage Engine / Repl Tracking SQL CE Edition v2.0 OLEDB OLEDB OLEDB CE CLR / .NET CF SQL Server CE Data Provider ADO.NET VS .NET (VB.NET, C#) . NET CF / Managed Stack IIS Server Agent: Replication and Remote Data Access HTTP 802.11b, CDPD, GSM, CDMA, TDMA, etc. Occasionally Connected Data Provider Client Agent: Replication and RDA

SQL Server CE (2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Setting up SQL Server CE - RDA ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],SqlCeRemoteDataAccess rda = new SqlCeRemoteDataAccess("http://shawnw-lptd/sqlce/sscesa20.dll", "Data Source=northwind.sdf");

SQL Server CE - RDA ,[object Object],[object Object],[object Object],[object Object],[object Object],string rdaOleDbConnectString = "Provider=sqloledb;Data Source=shawnw-lptd;" + "Initial Catalog=Northwind;User Id=Sample;Password=ADONET"; rda.Pull("Customers", "SELECT * FROM Customers", rdaOleDbConnectString , RdaTrackOption.TrackingOnWithIndexes); rda.Pull("Products", "SELECT * FROM Products", rdaOleDbConnectString , RdaTrackOption.TrackingOnWithIndexes); rda.Pull("Orders", "SELECT * FROM Orders", rdaOleDbConnectString , RdaTrackOption.TrackingOnWithIndexes); rda.Pull("OrderDetails", "SELECT * FROM OrderDetails", rdaOleDbConnectString , RdaTrackOption.TrackingOnWithIndexes);

SQL Server CE – RDA (2) ,[object Object],[object Object],[object Object],// Create the connection and command Sql Ce Connection conn = new Sql Ce Connection("..."); Sql Ce Command cmd = conn.CreateCommand(); cmd.CommandText = "SELECT * FROM Customers"; // Create a DataSet to put our results in DataSet ds = new DataSet(); // Create the adapter Sql Ce DataAdapter da = new Sql Ce DataAdapter(cmd); // Fill it da.Fill(ds, "Customers");

SQL Server CE – RDA (3) ,[object Object],[object Object],[object Object],[object Object],rda.Push("Customers", rdaOleDbConnectString, RdaBatchOption.BatchingOn); rda.Push("Products", rdaOleDbConnectString, RdaBatchOption.BatchingOn); rda.Push("Orders", rdaOleDbConnectString, RdaBatchOption.BatchingOn); rda.Push("OrderDetails", rdaOleDbConnectString, RdaBatchOption.BatchingOn);

SQL Server CE – Merge Replication ,[object Object],[object Object],[object Object],[object Object],SqlCeReplication repl = new SqlCeReplication(); repl.InternetUrl = "http://shawnw-lptd/sqlce/sscesa20.dll"; repl.Publisher = "SHAWNW-LPTD"; repl.PublisherDatabase = "Northwind"; repl.PublisherLogin = "sample"; repl.PublisherPassword = "ADONET"; repl.Publication = "Northwind"; repl.Subscriber = "OrderTaker"; repl.SubscriberConnectionString = "Data Source=northwind.sdf"; // Create the Local SSCE Database subscription repl.AddSubscription(AddOption.CreateDatabase); // Synchronize to the SQL Server 2000 to populate the Subscription repl.Synchronize();

SQL Server CE – Merge Replication (2) ,[object Object],[object Object],[object Object],// Create the connection and command SqlCeConnection conn = new SqlCeConnection("..."); SqlCeCommand cmd = conn.CreateCommand(); cmd.CommandText = "SELECT * FROM Customers"; // Create a DataSet to put our results in DataSet ds = new DataSet(); // Create the adapter SqlCeDataAdapter da = new SqlCeDataAdapter(cmd); // Fill it da.Fill(ds, "Customers");

SQL Server CE – Merge Replication (3) ,[object Object],[object Object],[object Object],SqlCeReplication repl = new SqlCeReplication(); // ... // Synchronize to the SQL Server 2000 // to populate the Subscription repl.Synchronize();

SQL Server CE - Caveats ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Web Services ,[object Object],[object Object],[object Object],[object Object],[object Object],[WebMethod] public XmlDocument Products() { // ... // Using WriteSchema to make sure the entire // structure is included on client side MemoryStream strm = new MemoryStream(); ds.WriteXml(strm, XmlWriteMode.WriteSchema ); strm.Position = 0; XmlDocument doc = new XmlDocument(); doc.Load(strm); return doc; }

Web Services (2) ,[object Object],[object Object],[object Object],// Create the service GetPhoneDataService theSvc = new GetPhoneDataService(); // Load the data through the Web Service XmlDocument doc = theSvc.Products(); // NOTE: Can't use a Typed DataSet Here // Make it into a DataSet DataSet ds = new DataSet(); XmlNodeReader rdr = new XmlNodeReader(node); ds.ReadXml(rdr, XmlReadMode.ReadSchema); // Must use AcceptChanges // (ReadXml makes rows new) ds.AcceptChanges();

Web Services (3) ,[object Object],[object Object],[object Object],[object Object],// Write the data locally ds.WriteXml("local.xml", XmlWriteMode.DiffGram); // Read it locally ds.ReadXml("local.xml", XmlReadMode.DiffGram);

Web Services (4) ,[object Object],[object Object],[object Object],[object Object],XmlDocument doc = new XmlDocument(); MemoryStream strm = new MemoryStream(); XmlTextWriter writer = new XmlTextWriter(strm, System.Text.Encoding.UTF8); ds.WriteXml(writer, XmlWriteMode.DiffGram ); strm.Position = 0; doc.Load(strm); svc.SetDataSet(doc); [WebMethod] public XmlDocument SaveChanges(XmlDocument doc) { MyTypedDs ds = new MyTypedDs(); ds.ReadXml(doc, XmlReadMode.DiffGram ); DataSet updated = UpdateDataSet(ds); return new XmlDataDocument(updated); }

DataBinding ,[object Object],[object Object],[object Object],[object Object],// This is faster foreach (DataRow cust in ds.Tables["Customers"].Rows) { listBox1.Items.Add(cust["CompanyName"]); } // This is slower, but more functional listBox1.DataSource = ds.Tables["Customers"]; listBox1.DisplayMember = "CompanyName"; listBox1.ValueMember = "CustomerID";

DataBinding (2) ,[object Object],[object Object],[object Object],[object Object],CurrencyManager mgr = (CurrencyManager)listBox1.BindingContext[ds.Tables["Customers"]]; mgr.Position++; DataTable tbl = ds.Tables["Customers"]; listBox.DataSource = tbl; comboBox.DataSource = tbl; textBox.Bindings.Add("Text", tbl, "CompanyName");

DataBinding (3) ,[object Object],// Launch the process on a background thread ThreadPool.QueueUserWorkItem(new WaitCallback(BindDataToForm)); void BindDataToForm(object o) { // Do Data Binding }

SQL Server Mobile Edition ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

SQL Server Mobile Edition (2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Data Access Mobile Devices

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