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if (string.Empty == this.txtParameter.Text) { if (null != _parentForm) { _parentForm.DisplayMessage( "Please enter parameter name for deleting", true ); } return; } TabPage page = null; foreach (TabPage p in tabParameter.TabPages) { if (p.Text == txtParameter.Text.Trim()) { page = p; break; } } if (null != page) { int parameterCount = _sqlDatabaseAccessService.Command.SQLParameterRoot.Length; if (null != _sqlDatabaseAccessService.Command.SQLParameterRoot && parameterCount > 0) { List<SQLParameterRoot> parameterList = new List<SQLParameterRoot>(); foreach (SQLParameterRoot param in _sqlDatabaseAccessService.Command.SQLParameterRoot) { if (String.Compare(param.Parameter.Name, page.Text, true) != 0) { parameterList.Add(param); } } _sqlDatabaseAccessService.Command.SQLParameterRoot = new SQLParameterRoot[parameterList.Count]; if (parameterList.Count > 0) { parameterList.CopyTo( _sqlDatabaseAccessService.Command.SQLParameterRoot ); } this.tabParameter.TabPages.Remove(page); } }

Instance members come into existence when the instance is created and go out of existence when the instance is destroyed. Static members, however, exist and are accessible even if there are no instances of the class. Figure 6-4 illustrates a class D, with a static field, Mem2. Although Main does not define any instances of the class, it assigns the value 5 to the static field and prints it out.

<td><input type="text" name="name" value="${book.name}"></td> </tr> <tr> <td>Publish Date</td> <td> <input type="text" name="publishDate" value="<fmt:formatDate value="${book.publishDate}" pattern="yyyy/MM/dd"/>"> </td> </tr> <tr> <td>Price</td> <td><input type="text" name="price" value="${book.price}"></td> </tr> <tr> <td colspan="2"> <input type="hidden" name="bookId" value="${book. id}"> <input type="submit" value="Submit"></td> </tr> </table> </form> </body> </html>

Figure 6-4. Static field with no class instances The code in Figure 6-4 produces the following output:

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else if (null != this._parentForm) { this._parentForm.DisplayMessage( string.Format("Can not find the parameter <{0}>", txtParameter.Text), true ); } } private void radioButtonQuery_CheckedChanged(object sender, EventArgs e) { this.groupParameter.Enabled = false; } private void radioButtonStoredProcedure_CheckedChanged(object sender, EventArgs e) { this.groupParameter.Enabled = true; } private void richTextBoxCommandText_MouseUp(object sender, MouseEventArgs e) { if (null != eventSelectedTextChanged) { try { eventSelectedTextChanged( this, new SelectedTextArgs(String.IsNullOrEmpty(SelectedText) null:this) ); } catch { } } } void richTextBoxCommandText_PreviewKeyDown(object sender, PreviewKeyDownEventArgs e) { if (null != eventBubblePreviewKeyDown) { eventBubblePreviewKeyDown(this, e); } } private void SQLDataServiceControl_Leave(object sender, EventArgs e) { this.richTextBoxCommandText.Clear(); this.richTextBoxCommandText.Text = _sqlDatabaseAccessService.Command.Text; richTextBoxCommandText_MouseUp(this, null); } } }

Note Static members exist even if there are no instances of the class. If a static field has an initializer, the

Figure 14-5. The form on which users can edit the properties of a book When the Submit button is clicked, the doPost() method of BookEditServlet is called to handle the form submission. You first load the book object from the database and then update its properties according to the request parameters. The user is then redirected to the book list page (see Figure 14-6): public class BookEditServlet extends HttpServlet { ... protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String bookId = request.getParameter("bookId "); String isbn = request.getParameter("isbn"); String name = request.getParameter("name"); String publishDate = request.getParameter("publishDate"); String price = request.getParameter("price"); SessionFactory factory = HibernateUtil.getSessionFactory(); Session session = factory.openSession(); Transaction tx = null;

field is initialized before the use of any of the class s static fields, but not necessarily at the beginning of program execution.

The main window of SQLAzureConnect also has a binding source object defined to bind the data source to the data object instance s XML SQLDatabaseAccessRoot as Figure 8-25 shows.

Besides static fields, there are also static function members. Static function members, like static fields, are independent of any class instance. Even if there are no instances of a class, you can still call a static method. Static function members cannot access instance members. They can, however, access other static members. For example, the following class contains a static field and a static method. Notice that the body of the static method accesses the static field. class X { static public int A; // Static field static public void PrintValA() // Static method { Console.WriteLine("Value of A: {0}", A); } } Accessing the static field The following code uses class X, defined in the preceding code. Figure 6-5 illustrates the code. class Program { static void Main() { X.A = 10; X.PrintValA(); } } Class name

try { tx = session.beginTransaction(); Book book = (Book) session.get(Book.class, bookId); book.setIsbn(isbn); book.setName(name); book.setPublishDate(parseDate(publishDate)); book.setPrice(Integer.parseInt(price)); session.update(book); tx.commit(); } catch (HibernateException e) { if (tx != null) tx.rollback(); throw e; } finally { session.close(); } response.sendRedirect("bookListServlet"); } private Date parseDate(String date) { try { return new SimpleDateFormat("yyyy/MM/dd").parse(date); } catch (ParseException e) { return null; } } }

This code produces the following output:

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