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Figure 3-2 Elements of the MyMain class Each of these categories allows you to view the corresponding elements in a grouping that is easy to understand In addition to letting you quickly review the elements in the class without having to read code, these nodes also allow context-sensitive right-clicking to add new elements, as follows: Fields: Right-clicking the Fields node brings up a menu that allows you to add a field If you select that option, the Add New Field wizard starts Using this wizard, you can enter the field s name, data type, modifier, access level, and select an initial value all without having to actually modify the code in the Source Editor If you do not want to use one of the data types in the Type drop-down list, you can type your own value, such as java utilHashMap or MyCustomObject.

The database connection is then opened and the query is executed by using the ExecuteNonQuery() method of the SqlCommand object, which returns the number of records affected by the query and is returned to the caller The ExecuteScalar() method is used to execute SELECT queries that return just one value It takes two parameters: the SQL query to be executed and an array of the SqlParameter class representing parameters of the query The pattern is then the same as before: the method creates an instance of SqlConnection and SqlCommand, and SqlParameters are added to the Parameters collection The database connection is then opened and the query is executed by using the ExecuteScalar() method of the SqlCommand object, which returns the result of the query as an object This object is returned to the caller.

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Constructors: Right-clicking the Constructors node displays a menu allowing you to add a new constructor or static initializer The wizard also gives you the ability to add parameters and exceptions Methods: Right-clicking the Methods node brings up the Add New Method wizard As you can probably guess, this wizard allows you to add methods to the class and specify input parameters, return types, exceptions, and access modifiers Using the wizard, you can select or type the names of input parameters, return types, and exceptions Bean Patterns: If you were working on an EJB project, the Bean Patterns node might be useful For a simple Java class file, it is useful if you want to add a class member and associated getter and setter methods Right-click the Bean Patterns node and select Add Property.

Now you need to build the navigation control for displaying categories on the Browse Catalog page. You will use a web user control to do that. Create a new web user control called Categories.ascx with the source code shown in Listing 13-29.

The ExecuteDataSet() method is used to execute SELECT queries and retrieve the result set as a DataSet It takes two parameters: the SQL query to be executed and an array of the SqlParameter class representing parameters of the query The novel part of this method instantiates a SqlDataAdapter The SelectCommand property of the SqlDataAdapter is set to the SqlCommand instance that we just created The SqlDataAdapter then fills a DataSet with the help of the Fill() method The filled DataSet is then returned to the caller..

In the wizard that opens, you can specify the class member you want to add and specify that the related setter and getter methods for the class are also generated This can save time if you will be adding several class members and know you will want the associated setter and getter methods..

In 6, you learned to apply XSLT style sheets to XML data. You saw that XSLT allows you to transform XML data from one form to another. The same concept also can be applied in SQLXML, where you may wish to apply XSLT templates to whatever data you receive in your client application. This is accomplished by using the XslPath property of the SqlXmlCommand class. To demonstrate the use of XslPath, you need to develop an application as shown in Figure 10-6.

Listing 13-29. Categories.ascx File <%@ Import Namespace="BusinessLayer" %> <%@ Import Namespace="DataLayer" %> <%@ Import Namespace="System.Collections" %> <%@ Control Language="c#" CodeFile="Categories.ascx.cs" Inherits="Categories_ascx" AutoEventWireup="true"> <table width="100"> <% if (categories != null) { for (int i = 0; i < categories.Count; i++) { Category category = (Category)categories[i]; %> <tr> <td> <a href="BrowseCatalog.aspx categoryID=<% Response.Write(category.CategoryID.ToString()); %>"> <% Response.Write(category.CategoryName); %> </a> </td> </tr> <% } } %> </table> Then select the View Code menu item and make the Categories.ascx.cs file match the source code shown in Listing 13-30. Listing 13-30. Categories.ascx.cs File using using using using using System; System.Collections; System.Drawing; BusinessLayer; DataLayer;

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