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1. Add the ShoppingCartRemoveOldCarts stored procedure to the database. It receives as a parameter the maximum number of days for a shopping cart age. All shopping carts older than that are deleted. CREATE PROCEDURE ShoppingCartDeleteOldCarts (@Days smallint) AS DELETE FROM ShoppingCart WHERE CartID IN (SELECT CartID FROM ShoppingCart GROUP BY CartID HAVING MIN(DATEDIFF(dd,DateAdded,GETDATE())) >= @Days) 2. Add ShoppingCartCountOldCarts, which returns the number of shopping cart elements that would be deleted by a ShoppingCartCountOldCarts call: CREATE PROCEDURE ShoppingCartCountOldCarts (@Days smallint) AS SELECT COUNT(CartID) FROM ShoppingCart WHERE CartID IN (SELECT CartID FROM ShoppingCart GROUP BY CartID HAVING MIN(DATEDIFF(dd,DateAdded,GETDATE())) >= @Days) 3. Add these methods to the ShoppingCartAccess class (located in ShoppingCartAccess.cs). They are used to interact with the two stored procedures you wrote earlier. // Counts old shopping carts public static int CountOldCarts(byte days) { // get a configured DbCommand object DbCommand comm = GenericDataAccess.CreateCommand(); // set the stored procedure name comm.CommandText = "ShoppingCartCountOldCarts"; // create a new parameter DbParameter param = comm.CreateParameter(); param.ParameterName = "@Days"; param.Value = days; param.DbType = DbType.Byte; comm.Parameters.Add(param);

The command within the if statement is changeLights(); and this is an example of a function call A function is simply a separate code block that has been given a name However, functions can be passed parameters and/or return data, too In this case, you have not passed any data to the function nor have you had the function return any date I will go into more detail later on about passing parameters and returning data from functions When changeLights() is called, the code execution jumps from the current line to the function, executes the code within that function, and then returns to the point in the code after where the function was called In this case, if the conditions in the if statement are met, then the program executes the code within the function and returns to the next line after changeLights() in the if statement.

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package com.commonsware.android.strings; import import import import import import import import android.app.Activity; android.os.Bundle; android.text.TextUtils; android.text.Html; android.view.View; android.widget.Button; android.widget.EditText; android.widget.TextView;

// execute the procedure and return number of old shopping carts try { return Byte.Parse(GenericDataAccess.ExecuteScalar(comm)); } catch { return -1; } } // Deletes old shopping carts public static bool DeleteOldCarts(byte days) { // get a configured DbCommand object DbCommand comm = GenericDataAccess.CreateCommand(); // set the stored procedure name comm.CommandText = "ShoppingCartDeleteOldCarts"; // create a new parameter DbParameter param = comm.CreateParameter(); param.ParameterName = "@Days"; param.Value = days; param.DbType = DbType.Byte; comm.Parameters.Add(param); // execute the procedure and return true if no problem occurs try { GenericDataAccess.ExecuteNonQuery(comm); return true; } catch { return false; } } 4. Create a new Web Form at the root of the BalloonShop project, named ShoppingCartAdmin.aspx, based on the Admin.master Master Page. 5. While in Source View, add this code to the first place holder: <asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server"> <span class="AdminTitle">Shopping Cart Admin</span> </asp:Content> 6. Add the following content to the second place holder:

The code within the function simply changes the vehicles lights to red, via amber, then turns on the green pedestrian light After a period of time set by the variable crossTime, the light flashes a few time to warn the pedestrian that his time is about to run out, then the pedestrian light goes red and the vehicle light goes from red to green, via amber, thus returning to its normal state The main program loop simply checks continuously if the pedestrian button has been pressed or not, and, if it has and (&&) the time since the lights last changed is greater than 5 seconds, it calls the changeLights() function again In this program, there was no benefit from putting the code into its own function, apart from making the code look cleaner and to explain the concept of functions.

public class StringsDemo extends Activity { EditText name; TextView result; @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); setContentView(R.layout.main);

<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder2" runat="Server"> <asp:Label ID="countLabel" runat="server" CssClass="AdminPageText"> Hello! </asp:Label><br /> <span class="AdminPageText">How many days </span> <asp:DropDownList ID="daysList" runat="server"> <asp:ListItem Value="0">All shopping carts</asp:ListItem> <asp:ListItem Value="1">One</asp:ListItem> <asp:ListItem Value="10" Selected="True">Ten</asp:ListItem> <asp:ListItem Value="20">Twenty</asp:ListItem> <asp:ListItem Value="30">Thirty</asp:ListItem> <asp:ListItem Value="90">Ninety</asp:ListItem> </asp:DropDownList><br /> <br /> <asp:Button ID="countButton" runat="server" Text="Count Old Shopping Carts" CssClass="Button" /> <asp:Button ID="deleteButton" runat="server" Text="Delete Old Shopping Carts" CssClass="Button" /> </asp:Content> Now if you switch to Design View, you should see a form like the one shown in Figure 9-12.

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