Figure 622: Adding a New Typed Data Set in .NET framework

Paint Code 128A in .NET framework Figure 622: Adding a New Typed Data Set
Figure 622: Adding a New Typed Data Set
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data table and its associated data adapter, connection, and command objects Since our data set will contain five data tables, we will pass through this series of dialogs five times The first of these dialogs is shown in Figure 623 and lets us specify the underlying database The next few let us write the command that will retrieve the database data into the data table In our case, with the Designer s help, we write the command shown in Figure 624 We then accept all defaults for the remaining dialogs and arrive at the situation shown in Figure 625: a data set that contains one table, a five-column
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Figure 623: Specifying the Data Connection
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Figure 624: Coding the Query
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Figure 625: The Resulting DataTable and Its TableAdapter
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Employee table Note that Visual Studio has detected the presence of a pri-
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mary key constraint in the database table and has included that constraint in the definition of the data table We ll define four more data tables but show the dialogs for only one of them, as the one aspect left to be illustrated is relationships When we complete the definition of the first of our four remaining data tables, the Orders data table, Visual Studio detects a foreign key relationship between Employees and Orders and adds it to the typed data set, as shown in Figure 626 We add three more table adapters, generating three more data tables and their respective data adapters, and arrive at the typed data set shown in Figure 627: a data set that we will use in this sample and again in 7 The code for our typed data set class, written by Visual Studio, is in the SalesDataDesignercs file, which appears in the Solution Explorer when you expand the SalesDataxsd file icon It contains the code that exposes the data tables as properties of the data set; routines for navigating relationships, such as ourEmployeeRowGetOrdersRows(); routines for
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Figure 626: Two DataTables and Their DataRelation
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Figure 627: The Five Tables of Application Data
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finding a row given its primary key value, such as ourEmployeeTableFindByEmployeeId(); and others What neither the class itself, nor any other class in the project, contains is code to create an instance of our data set and code to fill that instance with data from the database That code we must write ourselves Fortunately, there is sufficient code already in the typed data set class to make our share relatively small and easy to write For the moment, we will put all the necessary code required to create and load the data set in the LoadDataset menu item s Click event handler, as shown in Listing 619
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Listing 619: Code to Create and Load a Typed Data Set
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SalesData dsetSales = new SalesData(); EmployeesTableAdapter daptEmployee = new EmployeesTableAdapter(); daptEmployeeFill(dsetSalesEmployees); CustomersTableAdapter daptCustomer = new CustomersTableAdapter(); daptCustomerFill(dsetSalesCustomers); ProductsTableAdapter daptProduct = new ProductsTableAdapter(); daptProductFill(dsetSalesProducts); OrdersTableAdapter daptOrder = new OrdersTableAdapter(); daptOrderFill(dsetSalesOrders); Order_DetailsTableAdapter daptDetail =
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New Order_DetailsTableAdapter(); daptDetailFill(dsetSalesOrder_Details); dgrdOrdersDataSource = dsetSalesEmployees FindByEmployeeID(1)GetOrdersRows();
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This code creates a data set containing five empty tables, creates five table adapters and uses them to fill the five tables, and then selects all orders for the employee whose Employee ID is 1 and binds those orders to a data grid, resulting in the display shown in Figure 628 When Visual Studio wrote the code for the data set class, it defined a class for each table adapter, which it placed inside a namespace named SalesDataTableAdapters; that is, the name of the data set suffixed by TableAdapters That namespace was placed inside the project s default namespace, in our case, TypedDataset Thus, the code shown in Listing 619 requires the following line at the start of the code file:
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using TypedDatasetSalesDataTableAdapters;
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Now let us consider a small enhancement that will make our data set class more functional and more flexible The added functionality will be a Load method in the data set class that will pull the data in from the database, allowing us to remove all knowledge of, and dependence upon, the table adapters from the form class s code The added flexibility will be the option to specify the source database at runtime rather than being bound to the database that was specified at design time This database designation will
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