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// execute the stored procedure and return true if it executes // successfully, or false otherwise return (GenericDataAccess.ExecuteNonQuery(comm) != -1); } catch { // prevent the exception from propagating, but return false to // signal the error return false; } } GetItems GetItems retrieves all the products in the customer s shopping cart. This is called from the presentation tier when the visitor wants to view the cart: // Retrieve shopping cart items public static DataTable GetItems() { // get a configured DbCommand object DbCommand comm = GenericDataAccess.CreateCommand(); // set the stored procedure name comm.CommandText = "ShoppingCartGetItems"; // create a new parameter DbParameter param = comm.CreateParameter(); param.ParameterName = "@CartID"; param.Value = shoppingCartId; param.DbType = DbType.String; param.Size = 36; comm.Parameters.Add(param); // return the result table DataTable table = GenericDataAccess.ExecuteSelectCommand(comm); return table; } GetTotalAmount GetTotalAmount does exactly what its name suggests, and it s a bit more interesting than the others because it uses SqlCommand s ExecuteScalar method, which we haven t used so far. Add it to the ShoppingCart class, and we ll discuss the details: // Retrieve shopping cart items public static decimal GetTotalAmount() { // get a configured DbCommand object DbCommand comm = GenericDataAccess.CreateCommand(); // set the stored procedure name comm.CommandText = "ShoppingCartGetTotalAmount";

public class RotationThreeDemo extends Activity { static final int PICK_REQUEST=1337; Button viewButton=null; Uri contact=null; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setupViews(); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { if (requestCode==PICK_REQUEST) { if (resultCode==RESULT_OK) { contact=data.getData(); viewButton.setEnabled(true); } } } public void onConfigurationChanged(Configuration newConfig) {

// create a new parameter DbParameter param = comm.CreateParameter(); param.ParameterName = "@CartID"; param.Value = shoppingCartId; param.DbType = DbType.String; param.Size = 36; comm.Parameters.Add(param); // return the result table return Decimal.Parse(GenericDataAccess.ExecuteScalar(comm)); }

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// Process each char from web void serialEvent() { // Read a char char inChar = client.read(); if (inChar == '<') { addChar(inChar, tmpStr); tagFlag = true; dataFlag = false; } else if (inChar == '>') { addChar(inChar, tmpStr); if (tagFlag) { strncpy(tagStr, tmpStr, strlen(tmpStr)+1); } // Clear tmp clearStr(tmpStr); tagFlag = false; dataFlag = true; } else if (inChar != 10) { if (tagFlag) { // Add tag char to string addChar(inChar, tmpStr); // Check for </XML> end tag, ignore it if ( tagFlag && strcmp(tmpStr, endTag) == 0 ) { clearStr(tmpStr); tagFlag = false; dataFlag = false; }

Okay, now that the foundation functionality is in place, you can add the presentation tier bits. Building the user interface for the shopping cart functionality involves the following major steps: Creating Add to Cart buttons (refer to Figure 9-2) Showing shopping cart summary information in catalog pages (refer to Figure 9-2) Creating the actual shopping cart page (refer to Figure 9-1) Allowing the visitor to update product quantities in the shopping cart Implementing Continue Shopping functionality Let s deal with these tasks one by one.

super.onConfigurationChanged(newConfig); setupViews(); } private void setupViews() { setContentView(R.layout.main); Button btn=(Button)findViewById(R.id.pick); btn.setOnClickListener(new View.OnClickListener() { public void onClick(View view) { Intent i=new Intent(Intent.ACTION_PICK, Contacts.CONTENT_URI); startActivityForResult(i, PICK_REQUEST); } }); viewButton=(Button)findViewById(R.id.view); viewButton.setOnClickListener(new View.OnClickListener() { public void onClick(View view) { startActivity(new Intent(Intent.ACTION_VIEW, contact)); } }); viewButton.setEnabled(contact!=null); } }

if (dataFlag) { // Add data char to string addChar(inChar, dataStr); }

You can choose to have Add to Cart buttons only in the products details pages (Product.aspx), in the product listings (ProductsList.ascx), or in both. Follow the steps in the following exercise to add your buttons.

The onCreate() implementation delegates most of its logic to a setupViews() method, which loads the layout and sets up the buttons. This logic was broken out into its own method because it is also called from onConfigurationChanged().

// If a LF, process the line if (inChar == 10 ) { // Find specific tags and print data if (matchTag("<temp_f>")) { Serial.print("Temp: "); Serial.print(dataStr); } if (matchTag("<temp_c>")) { Serial.print(", TempC: "); Serial.print(dataStr); } if (matchTag("<relative_humidity>")) { Serial.print(", Humidity: "); Serial.print(dataStr); } if (matchTag("<pressure_in>")) { Serial.print(", Pressure: "); Serial.print(dataStr); Serial.println(""); } // Clear all strings clearStr(tmpStr); clearStr(tagStr); clearStr(dataStr); // Clear Flags tagFlag = false; dataFlag = false; } }

1. If you implemented the PayPal shopping cart in 7, you now need to remove the PayPal Add to Cart buttons from Product.aspx. Open the file in HTML View and remove the following code: <a runat="server" id="addToCartLink"> <IMG src="Images/AddToCart.gif" border="0"> </a> Then remove the associated code from the PopulateControls method in Product.aspx.cs: // Create the "Add to Cart" PayPal link string link = "JavaScript: OpenPayPalWindow(\"https://www.paypal.com/

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