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public override bool HasValue { get { return reader.IsDBNull(intColumnIndex); } } The HasValue property indicates whether the TableReader contains any value. If the column contains a NULL value, HasValue should return false. The IsDbNull() method of the OleDbDataReader class accepts a column index and returns true if the column contains a NULL value.

// Build command string string commandText = "SELECT * FROM Categories"; dataCommand.CommandText = commandText; OdbcDataReader dataReader = dataCommand.ExecuteReader(); // Iterate over the query results while ( dataReader.Read() ) { Category category = new Category(dataReader.GetInt32(0), dataReader.GetString(1)); categories.Add(category); } dataConnection.Close(); } catch(Exception e) { Console.WriteLine("Error: " + e.Message); } return categories; } } } If you try to build the solution now, it will fail because the Category class is undefined. To fix that, you need to add a new class called Category.cs to the BusinessLayer project. Listing 13-18 shows the source code for the Category class. Listing 13-18. Category.cs File #region Using directives using System; using System.Collections.Generic; using System.Tesxt; #endregion namespace BusinessLayer { public class Category { private int categoryID; private string categoryName;

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were added, blue lines were modified, and red lines were removed. However, it has been my experience that the CVS color-coding in Diff tools is not an exact science and sometimes appears incorrectly. In the Diff tool, you can use the up and down arrow icons along the top to navigate the differences between the files. You can also use the toolbar icons to either update the local file or commit it. To compare differences in multiple files or the entire project, select CVS Diff All Files. In this case, the drop-down list with the filename at the top left of the Diff window will include all files that have been locally added, modified, or deleted. Choosing a file from the drop-down list will open the file s difference comparison.

public override bool ReadAttributeValue() { if (intColumnIndex < reader.FieldCount) { strValue = reader.GetValue(intColumnIndex).ToString(); return true; } else { return false; } } The ReadAttributeValue() method returns the value of the current column. It does so by using the GetValue() method of the OleDbDataReader class as before.

One of the nice features of the NetBeans CVS tool is the ability to search the history of files in the repository. Using the Search History tool, you can query versions of files for several parameters, and perform a variety of important operations. To search the history of an individual file, package, or project, right-click the element and select CVS Search History. If you are searching using an individual file, the Search History tool automatically queries the repository and displays all the versions of that file. If you are searching multiple files at the package or project level, the Search History tool will open but not display results. You will need to manually enter search terms or just click the Search button to execute the search without any filtering parameters. Figure 13-14 shows the results of searching on the com.email package without any filtering parameters.

public string Name { get { if (intColumnIndex == -1) { return cmd.CommandText; } else { return reader.GetName(intColumnIndex); } } } The Name property returns either the underlying table name or column name. This is useful to see which column is being read. The table name is obtained from the CommandText property of the OleDbCommand class, whereas the column name is obtained from the GetName() method of the OleDbDataReader class.

public Category() { } public Category(int categoryID, string categoryName) { this.categoryID = categoryID; this.categoryName = categoryName; } } } Lastly, you want to update the source for the CategoryTests.cs file as shown in Listing 13-19. Listing 13-19. Modified CategoryTests.cs File #region Using directives using System; using System.Collections; using System.Collections.Generic; using System.Data; using System.Data.Odbc; using System.Text; using NUnit.Framework; using DataLayer; #endregion namespace TestLayer { [TestFixture] public class CategoryTests { private StringBuilder connectionString; private int categoryID; public CategoryTests() { // Build connection string connectionString = new StringBuilder("Driver={Microsoft Access Driver (*.mdb)};"); connectionString.Append("DBQ=c:\\xpnet\\database\\Northwind.mdb "); }

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