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For the Purchase Tracker sample application: Open the PurchaseList class in the Code Editor In the Create method, remove the hard-coded values, and insert a call to the ExecuteDataTable method, as detailed in this section
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Building the Data Access Layer
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Open the Purchase class in the Code Editor Create an overloaded Create method to accept a DataRow object as a parameter, as shown in this section Run the application It displays your splash screen and then shows the MDI parent form Select Purchase Tracker | View Purchases to display the PurchasesWin form You can select any customer from the list and view the associated purchases If necessary, add more sample data to your database to fully test this feature
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Unless you are building a read-only application, you also need code to save the properties of the objects back to the database To save the properties of a business object, add a Save method that calls the same ExecuteDataTable method in the DAC but passes every property as a parameter The code in a sample Save method is as follows:
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''' <summary> ''' Saves the current object properties back to the database ''' </summary> ''' <returns>True if the save was successful; ''' otherwise False</returns> ''' <remarks></remarks> Public Function Save() As Boolean Dim success As Boolean = False ' Pass the properties back to the DAC Dim dt As DataTable dt = DACExecuteDataTable(MyResourcesSP_ProductSave, _ DACParameter(CN_ProductID, ProductID), _ DACParameter(CN_ProductName, ProductName), _ DACParameter(CN_ProductNumber, ProductNumber), _ DACParameter(CN_Description, Description), _ DACParameter(CN_Price, Price), _ DACParameter(CN_ProductType, ProductType), _ DACParameter(CN_StockType, StockType), _ DACParameter(CN_LastUpdateUser, MyUserName), _ DACParameter(CN_RowState, EntityStateToString)) ' If it was an add, update the product ID If EntityState = EntityStateEnumAdded Then
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ProductID = CType(dtRows(0)Item(CN_ProductID), Integer) End If ' Reset the entity's state MeDataStateChanged(EntityStateEnumUnchanged) success = True Return success End Function
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This method begins by calling ExecuteDataTable and passing every property value as a parameter This assumes that the names of the columns in the table match the names of the parameters in the stored procedures The ExecuteDataTable returns a DataTable object, but the only time this method needs to access the returned DataTable object is when a row is added In that case, SQL Server assigns a new ID value, so the returned ID is reassigned to the associated property The EntityState is then reset to Unchanged, because there are no longer any unsaved changes You then need to add code in the ProcessSave method of each form to call the business object s Save method:
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Public Function ProcessSave() As Boolean _ Implements IMDIChildProcessSave Dim success As Boolean MeValidate() success = DirectCast(ProductBindingSourceCurrent, _ PTBOProduct)Save() Return success End Function
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8 BUILDING THE DATA ACCESS LAYER
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This code rst calls the form s Validate method Normally, validation for a control occurs when the user leaves the control Calling the Validate method ensures that the current control is validated, even if the user does not leave the control See 7 for more information on validation The code then uses the instance of the business object referenced by the Current property of the BindingSource component to call the Save method The properties for the currently displayed business object are then saved
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Use defensive coding techniques in the ProcessSave function to ensure that it won t generate an error if there is no current product:
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If ProductBindingSourceCurrent Is Nothing Then MessageBoxShow("Select a Product to save first, " & _ "then select the Save option", MeText) success = False Else MeValidate() success = DirectCast(ProductBindingSourceCurrent, _ Product)Save() End If
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Or use TryCast as follows:
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Dim prod As Product prod = TryCast(ProductBindingSourceCurrent, Product) If prod Is Nothing Then MessageBoxShow("Select a Product to save first, " & _ "then select the Save option", MeText) Else MeValidate() prodSave() End If
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