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You are now familiar with the various aspects of configuring log4j. Starting with the next section, we will explore different log4j objects in detail.

As you look through the Add Employee Wizard, you ll encounter two business classes that help the wizard interact with employee data from the database: the Employee class and the EmployeeCollection class. You ll also encounter the Data class, which contains a number of database-related utility functions used by both business objects to acquire a database connection and handle various types of data. In the sections that follow, you ll look at the code for these classes and gain a bit of insight as to what each one does. Make sure you pay careful attention to the GetEmployeeMatches function in the EmployeeCollection because it uses phonetic searching on employee names to locate possible duplicates.

* Base class for all games. Extends {@link LinearLayout} and uses a * {@link TimerTask} to invalidate the view * * @author V. Silva * */ public abstract class ArcadeGame extends LinearLayout { // App context private Context mContex; // Update timer used to invalidate the view private Timer mUpdateTimer; // Timer period private long mPeriod = 1000; /** * C * * @param context */ public ArcadeGame(Context context) { super(context); mContex = context; } public ArcadeGame(Context context, AttributeSet attrs) { super(context, attrs); mContex = context; } /** * Fires on layout */ protected void onLayout(boolean changed, int l, int t, int r, int b) { super.onLayout(changed, l, t, r, b); try { // Init game initialize(); /** * start update task. Which will fire onDraw in the future */ startUpdateTimer(); } catch (Exception e) { // bug e.printStackTrace(); } } /**

The Data class is responsible for holding common database access functions shared by the Employee and EmployeeCollection classes. Most of the functions in the class only have one or two lines of code, so it should be fairly easy to determine their purpose, but I ll briefly describe what each function does after Listing 10-12. Listing 10-12. Data Class Imports System.Data.SqlClient Imports system.Web.Configuration.WebConfigurationManager Public Class Data '*************************************************************************** Public Shared Function GetConnectionString() As String Return ConnectionStrings("Northwind").ConnectionString End Function '*************************************************************************** Public Shared Function GetOpenConnection() As SqlConnection Dim conn As New SqlConnection(GetConnectionString) conn.Open() Return conn End Function

'*************************************************************************** Public Shared Function SQLEncode(ByVal sqlString As String) As String Return sqlString.Replace("'", "''") End Function '*************************************************************************** Public Shared Function GetInteger(ByVal obj As Object) As Integer If IsDBNull(obj) Then Return 0 Else Return CInt(obj) End Function '*************************************************************************** Public Shared Function GetDate(ByVal obj As Object) As Date If IsDBNull(obj) Then Return Nothing Else Return CDate(obj) End Function '*************************************************************************** Public Shared Function GetString(ByVal obj As Object) As String If IsDBNull(obj) Then Return String.Empty Else Return CStr(obj) End Function '*************************************************************************** Public Shared Function StringToDate(ByVal dateString As String) As Date If IsDate(dateString) Then Return CDate(dateString) Return Nothing End Function '*************************************************************************** Public Shared Function NullableDate(ByVal dateIn As Date) As String If dateIn = Nothing Then Return "null" Else Return "'" & Format(dateIn, "MM/dd/yyyy") & "'" End If End Function End Class The first function in the class, GetConnectionString, is responsible for acquiring the Northwind database connection string from Web.config. For more information on acquiring connection strings from Web.config, see 2. GetOpenConnection, the next function in the class, uses the GetConnectionString function to create a new connection to the database. It creates and opens a new SqlConnection before returning it so the connection is ready to be used immediately. SQLEncode replaces all the apostrophes in a string with double apostrophes. In SQL, you need to escape an apostrophe with double apostrophes because SQL uses apostrophes as its string delimiter. You should use SQLEncode any time you re placing a user-entered string into a SQL statement to help avoid SQL injection attacks.