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CHAPTER 8 SQL AZURE
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{ InitializeComponent(); this.bindingSource.DataSource = _sqlParameter = sqlParameter; _parentForm = parentForm; _UpdateUI(); } public void Add(SQLParameterRoot sqlParameter) { this.bindingSource.Add(sqlParameter); } public void DoDataExchange() { _sqlParameter.Parameter.Value = this.txtValue.Text.Trim(); _sqlParameter.Parameter.Size = this.txtSize.Text; _sqlParameter.Parameter.Type = this.comboBoxType.SelectedItem.ToString(); if (radioButtonIn.Checked) { _sqlParameter.Parameter.Direction = SQLParameterRootParameterDirection.In; } else if (radioButtonOut.Checked) { _sqlParameter.Parameter.Direction = SQLParameterRootParameterDirection.Out; } else if (radioButtonInOut.Checked) { _sqlParameter.Parameter.Direction = SQLParameterRootParameterDirection.InOut; } else if (radioButtonReturn.Checked) { _sqlParameter.Parameter.Direction = SQLParameterRootParameterDirection.ReturnValue; } } private void _UpdateUI() { if (null != _sqlParameter) { this.txtValue.Text = _sqlParameter.Parameter.Value; this.txtSize.Text = _sqlParameter.Parameter.Size; this.comboBoxType.SelectedIndex = comboBoxType.Items.IndexOf(_sqlParameter.Parameter.Type); switch (_sqlParameter.Parameter.Direction) { case SQLParameterRootParameterDirection.Out: this.radioButtonOut.Select(); break; case SQLParameterRootParameterDirection.InOut:
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this.radioButtonInOut.Select(); break; case SQLParameterRootParameterDirection.ReturnValue: this.radioButtonReturn.Select(); break; case SQLParameterRootParameterDirection.In: default: this.radioButtonIn.Select(); break; } } } private void ParameterControl_Leave(object sender, EventArgs e) { DoDataExchange(); } } } For this user control and all other user controls following we use a BindingSource control to bind and synchronize the data object with the data that was edited by the user. This component comes with Visual Studio and can be found from the Toolbox pane under the Data category as Figure 8-21 shows. Figure 8-22 shows how to set up the property of the component after dragging it from the toolbox onto the user control design surface.
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Figure 8-21. Drag and drop the BindingSource component from Visual Studio Toolbox data pane to the ParameterControl design surface
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Figure 8-22. A BindingSource of ParameterControl is defined to bind the data source to the data object instance s XML SQLParameterRoot When the instance of SQLParameterRoot has been accepted, the values of the element and attribute will be updated to the UI component via the private method call to _UpdateUI(). When the control loses focus, the updated value modified by the user will be synchronized back to the XML data object via the method DoDataExchange(). The access to DoDataExchange() method is marked as public so that the parent host control can force a data refresh if necessary.
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The UI layout of the user control SQLDataServiceControl is shown in Figure 8-23, and the data binding source is defined to bind the data to the SQLDatabaseAccessRootSqlDataService as shown in Figure 8-24. The implementation of this user control is similar to that of ParameterControl. As with ParameterControl there are two methods, _UpdateUI() and DoDataExchange(), defined in this class that are used to handle UI updating and data synchronization. Since this control is the host control of Parameter controls, this control is responsible for handling the adding and deleting of the underlying Parameter controls and forcing data synchronization when this control loses focus or when a data synchronization request is received from the parent form. These tasks are handled in the methods _AddPage() and btnAddParameter_Click(). Listing 8-16 shows the implementation for the user control SQLDatabaseAccess.
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Figure 8-23. UI layout of the user control SQLDataServiceControl
Figure 8-24. A BindingSource of SQLDataServiceControl is defined to bind the data source to the data object instance s XML SQLDatabaseAccessRootSqlDataServiceRoot Listing 8-16. Implementation for SQLDatabaseAccessControl using using using using using using using using System; System.Collections.Generic; System.ComponentModel; System.Drawing; System.Data; System.Linq; System.Text; System.Windows.Forms;
CHAPTER 8 SQL AZURE
namespace SQLAzureConnect { using SQLAzureConnect.Schema.SQLDatabaseAccess; using SQLAzureConnect.Schema.SQLParameter; public partial class SQLDataServiceControl : UserControl { public SQLDatabaseAccessRootSqlDataService _sqlDatabaseAccessService = null; private FormSQLAzureConnect _parentForm = null; private TabPage _currentSelectedPage = null; public string SelectedText { get { return this.richTextBoxCommandText.SelectedText.Trim(); } } public event EventNotificationHandler eventSelectedTextChanged; public event EventBubblePreviewKeyDownHandler eventBubblePreviewKeyDown; public SQLDataServiceControl() { InitializeComponent(); } public SQLDataServiceControl(ref SQLDatabaseAccessRootSqlDataService sqlDatabaseAccessRoot, FormSQLAzureConnect parentForm) { InitializeComponent(); this.bindingSourceService.DataSource = _sqlDatabaseAccessService = sqlDatabaseAccessRoot; _parentForm = parentForm; _UpdateUI(); this.richTextBoxCommandText.PreviewKeyDown += new PreviewKeyDownEventHandler(richTextBoxCommandText_PreviewKeyDown); } public void DoDataExchange() { _sqlDatabaseAccessService.Subject = this.txtSubject.Text.Trim(); _sqlDatabaseAccessService.Description = this.txtDescription.Text.Trim(); _sqlDatabaseAccessService.Command.Text = this.richTextBoxCommandText.Text.Trim(); if (this.radioButtonQuery.Checked) { _sqlDatabaseAccessService.Command.Type = SQLDatabaseAccessRootSqlDataServiceCommandType.Query; } else if (this.radioButtonStoredProcedure.Checked) { _sqlDatabaseAccessService.Command.Type =
CHAPTER 8 SQL AZURE
SQLDatabaseAccessRootSqlDataServiceCommandType.Storedprocedure; } foreach (TabPage page in this.tabParameter.TabPages) { (page.Controls[0] as ParameterControl).DoDataExchange(); } } private void _UpdateUI() { if (null != _sqlDatabaseAccessService) { this.txtSubject.Text = _sqlDatabaseAccessService.Subject; this.txtDescription.Text = _sqlDatabaseAccessService.Description; switch (_sqlDatabaseAccessService.Command.Type) { case SQLDatabaseAccessRootSqlDataServiceCommandType.Storedprocedure: this.radioButtonStoredProcedure.Select(); break; case SQLDatabaseAccessRootSqlDataServiceCommandType.Query: default: this.radioButtonQuery.Select(); break; } this.richTextBoxCommandText.Clear(); this.richTextBoxCommandText.AppendText( _sqlDatabaseAccessService.Command.Text ); if (null != _sqlDatabaseAccessService.Command && null != _sqlDatabaseAccessService.Command.SQLParameterRoot) { for (int i = 0; i < _sqlDatabaseAccessService.Command.SQLParameterRoot.Length; ++i ) { _AddPage(ref _sqlDatabaseAccessService.Command.SQLParameterRoot[i]); } } if (this.tabParameter.TabPages.Count > 0) { tabParameter.SelectedTab = this.tabParameter.TabPages[0]; } } } private void tabParameter_SelectedIndexChanged(object sender, EventArgs e) { _currentSelectedPage = this.tabParameter.SelectedTab;
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