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The CommerceLibOrderInfo class is already versatile, as it exposes customer and order detail information on the fly. You can extend this class even further by allowing access to audit trail information directly. First, you need to add a new private field to CommerceLibOrderInfo to hold this data: private List<CommerceLibAuditInfo> auditTrail; Next, you need to give access to this field via a property. Here you can use a lazy initialization scheme and only load the audit trail when it s requested. When this happens, you use the new CommerceLibAccess.GetOrderAuditTrail method to obtain the audit trail data: public List<CommerceLibAuditInfo> AuditTrail { get { if (auditTrail == null) { auditTrail = CommerceLibAccess.GetOrderAuditTrail( OrderID.ToString()); } return auditTrail; } }





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Figure 1-8. A simple distributed application Here the database and data-access components are located on a separate server. Similarly, business logic components are located on their own server, and the client applications access these components through a network. Imagine that the client wants some data from





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Next, you need to add several methods to CommerceLibAccess to let the order admin page obtain lists of CommerceLibOrderInfo objects by using various filters. In all cases, you can return this information in the form of a List<CommerceLibOrderInfo> generic collection. Because the generic GenericDataAccess.ExecuteSelectCommand method you use to get data returns a DataTable, it makes sense to provide a standard way to convert between these list types. Along the way, you can discard invalid or old data (such as existing orders from the code in the first part of this book). Add the following method to CommerceLibAccess: public static List<CommerceLibOrderInfo> ConvertDataTableToOrders(DataTable table) { List<CommerceLibOrderInfo> orders = new List<CommerceLibOrderInfo>(table.Rows.Count); foreach (DataRow orderRow in table.Rows) { try { // try to add order orders.Add(new CommerceLibOrderInfo(orderRow)); } catch { // can't add this order } } return orders; }

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This is the first of the new CommerceLibAccess methods that will use the ConvertDataTableToOrders method added in the last section. In this case, the method passes the GUID ID of a customer to the CommerceLibOrdersGetByCustomer stored procedure and returns the resultant orders in the form of a List<CommerceLibOrderInfo> collection. Add the following method to CommerceLibAccess: public static List<CommerceLibOrderInfo> GetOrdersByCustomer( string customerID) { // get a configured DbCommand object DbCommand comm = GenericDataAccess.CreateCommand(); // set the stored procedure name comm.CommandText = "CommerceLibOrdersGetByCustomer";

2. 3. 4. 5. 6.

If you select the newly added radio button titled Save Schema, only the schema of the DataSet will be saved. Listing 7-12 shows the modified version of the code. Listing 7-12. Using the WriteXmlSchema() Method private void button1_Click(object sender, EventArgs e) { DataSet ds = new DataSet(); SqlDataAdapter da = new SqlDataAdapter("SELECT employeeid,firstname,lastname,homephone,notes FROM employees", @"data source=.\sqlexpress;initial catalog=northwind; integrated security=true"); da.Fill(ds, "employees"); if (radioButton1.Checked) { ds.WriteXml(textBox1.Text, XmlWriteMode.IgnoreSchema); } if (radioButton2.Checked) { ds.WriteXml(textBox1.Text, XmlWriteMode.WriteSchema); } if (radioButton3.Checked) { foreach (DataRow row in ds.Tables[0].Rows) { row.SetModified(); } ds.WriteXml(textBox1.Text, XmlWriteMode.DiffGram); } if (radioButton4.Checked) { ds.WriteXmlSchema(textBox1.Text); } if (checkBox1.Checked) { Process.Start(textBox1.Text); } } Notice the code marked in bold. The code calls the WriteXmlSchema() method by passing the file in which the schema information will be stored. You will observe that the schema obtained by this method is the same as that obtained by the WriteXml() method with XmlWriteMode.WriteSchema. However, no data is written to the file.

// create a new parameter DbParameter param = comm.CreateParameter(); param.ParameterName = "@CustomerID"; param.Value = new Guid(customerID); param.DbType = DbType.Guid; comm.Parameters.Add(param); // obtain the results return ConvertDataTableToOrders( GenericDataAccess.ExecuteSelectCommand(comm)); }

The WriteXml()and WriteXmlSchema() methods write XML data and schema to a stream or file, respectively. Sometimes you may wish to get the XML data and schema as a string rather than writing to a file. This is accomplished with two methods: The GetXml() method returns just the contents of the DataSet in XML format as a string. No schema information is returned. Similarly, the GetXmlSchema()method returns the XSD schema information of the DataSet as a string. Because these methods return strings, they incur more overhead than corresponding WriteXxx() methods.

Similarly, this method uses the CommerceLibOrdersGetByDate stored procedure to get the orders between two dates. Add the following method to CommerceLibAccess: public static List<CommerceLibOrderInfo> GetOrdersByDate( string startDate, string endDate) { // get a configured DbCommand object DbCommand comm = GenericDataAccess.CreateCommand(); // set the stored procedure name comm.CommandText = "CommerceLibOrdersGetByDate"; // create a new parameter DbParameter param = comm.CreateParameter(); param.ParameterName = "@StartDate"; param.Value = startDate; param.DbType = DbType.Date; comm.Parameters.Add(param); // create a new parameter param = comm.CreateParameter(); param.ParameterName = "@EndDate"; param.Value = endDate; param.DbType = DbType.Date; comm.Parameters.Add(param); // obtain the results return ConvertDataTableToOrders( GenericDataAccess.ExecuteSelectCommand(comm)); }

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