Dataset Tools in Visual Studio Provides links to pages that explain how to display data on Windows Forms through data-bound controls. To reach your Databaseobject, you must first reference the engine and the workspace as follows: Dim dbsCurrentDatabase as Database Set dbsCurrentDatabase = CurrentDb() Working with Data Access Objects APPENDIX C C W As you will see below, to run SQL queries in Access with VBA you can use either the DoCmd.RunSQL or CurrentDb.Execute methods. You can also rename the methods provided here. There are two patterns for populating data: You can have the TableAdapter implement one or both of these patterns. SQL Select This example will use the SQL Select statement to open a recordset: Dim rs As Recordset Set rs = CurrentDb.OpenRecordset("select *… You should specify the full path and name here. This will be created based on the data types in the data source. Visual Basic includes several new features to assist in developing applications that access data. This can present a problem, however, as the TableAdapter's methods for inserting, updating, and deleting data are based off of this initial method. Figure 22: All Changes are Synchronized with the Database When the Update Method is Invoked (Click to view full-size image). Contains links to pages that explain how data works in Office solutions, including information about schema-oriented programming, data caching, and server-side data access. Specifically, the TableAdapter contains an Update() method that can be passed the Typed DataSet, a strongly-typed DataTable, or one or more DataRows. Designed specifically for Microsoft Access, Total Access Statistics runs as an add-in for Access and offers a wide range of statistical functions to analyze your data. By taking care to add our queries to Categories and Suppliers as subqueries, rather than JOIN s, we'll avoid having to rework those methods for modifying data. You can see the list of columns in the Products DataTable (ProductID, ProductName, and so on), as well as the methods of the ProductsTableAdapter (Fill() and GetProducts()). In order to create a new database in MS Office Access , take the following steps: File Menu > New > Blank database. Start using the project / add windows form / data form wizard, create a new connection usig Jet 4, and go from there. Figure 6: Save the Connection String to Web.config (Click to view full-size image). The recommended approach, however, is to separate the data access logic from the presentation layer. In our DAL we will have methods like: These methods, when invoked, will connect to the database, issue the appropriate query, and return the results. See Import database objects into the current Access database. Also, let's rename the rather generic GetData method to GetProducts. A business object is implemented by the developer as a class whose properties typically reflect the columns of the underlying database table the business object represents. If you do not have a SQL Server 2000 or 2005 database server to connect to, or you simply want to avoid having to add the database to a database server, you can use the SQL Server 2005 Express Edition version of the Northwind database that is located in the downloaded website's App_Data folder (NORTHWND.MDF). Let's leave both checkboxes checked, even though we'll only be using the latter pattern throughout these tutorials. The web application was built using Visual Studio 2005 Professional Edition as a file system-based Web site project. If you left the "GenerateDBDirectMethods" checkbox checked when first creating the TableAdapter the DB direct pattern will also be implemented via Insert(), Update(), and Delete() methods. Finally, name the new method InsertProduct. (If you've unchecked the "Generate Insert, Update, and Delete statements" option from the advanced properties in Figure 9 this checkbox's setting will have no effect.) These parameterized queries can be tested directly from the DataSet Designer. Figure 28: Change the ExecuteMode Property to Scalar (Click to view full-size image). However, the Northwind database contains several related tables that we'll need to work with in our web application. Choose the ASP.NET Web Site template, set the Location drop-down list to File System, choose a folder to place the web site, and set the language to Visual Basic. Let's leave this checkbox selected. Let's create a method that adds a new product and then returns the value of the newly added record's ProductID. *Storing data in SQL Server or Microsoft Azure SQL requires a subscription to the service in question. To begin creating our DAL, we start by adding a Typed DataSet to our project. (This first tutorial is quite lengthy, but the rest are presented in much more digestible chunks.). VBA Date Format – Example #2. A DataSet object usually corresponds to a real database table or view, but DataSet is a disconnected view of the database. Generic Data Access Component in VB.NET. Your data can be in Access tables, linked from other sources such as SQL Server, or from a query. And best of all the DataTables returned by the TableAdapter can be bound to ASP.NET data Web controls, such as the GridView, DetailsView, DropDownList, CheckBoxList, and several others. or via his blog, which can be found at http://ScottOnWriting.NET. Fortunately, the auto-generated methods for inserting, updating, and deleting are not affected by subqueries in the SELECT clause. For the Fill pattern, let's change the name to FillByCategoryID and for the return a DataTable return pattern (the GetX methods), let's use GetProductsByCategoryID. LINQ to SQL All code that is specific to the underlying data source such as creating a connection to the database, issuing SELECT, INSERT, UPDATE, and DELETE commands, and so on should be located in the DAL. The first pattern, which I'll call the database direct pattern, involves creating methods that, when invoked, issue an INSERT, UPDATE, or DELETE command to the database that operates on a single database record. If so, drop me a line at mitchell@4GuysFromRolla.com. Data-bound forms for Windows applications are created by dragging items from the Data Sources Window onto the form. In order to retrieve the data to populate the DataTable, we use a TableAdapter class, which functions as our Data Access Layer. Looking at the previous code example, without IntelliSense's help it's not particularly clear what Products table column maps to each input parameter to the Update() and Insert() methods. With .NET 2.0's new partial class concept, it's easy to split a class across multiple files. Let's add the GetProductsByCategoryID(categoryID) method. For more information on the topics discussed in this tutorial, refer to the following resources: Scott Mitchell, author of seven ASP/ASP.NET books and founder of 4GuysFromRolla.com, has been working with Microsoft Web technologies since 1998. Take a moment to update the SELECT clause in the GetProductsByCategoryID(categoryID) method as well. In the next tutorial we'll define a number of business rules and see how to implement them in a separate Business Logic Layer. Various components of the data provider retrieve data for the application and update data. The benefits of this layered architecture are well documented (see the "Further Readings" section at the end of this tutorial for information on these advantages) and is the approach we will take in this series. VB.NET program that uses Date type Module Module1 Sub Main() ' The Date type is the same as the DateTime type. Figure 3 illustrates the workflow between the different layers of an application that uses Typed DataSets. At the end of the wizard we'll give a method name to this query. If you update the GetProducts() SELECT using JOIN syntax the DataSet Designer won't be able to auto-generate the methods for inserting, updating, and deleting database data using the DB direct pattern. Data in Office Solutions The following vb.net program shows how to bind an OLEDB dataset in a DataGridView. Provides links to topics about how to create multitiered data applications. Figure 9: Create the Query Graphically, through the Query Editor (Click to view full-size image). Complete the wizard by clicking Finish. To access a particular column from a loosely-typed DataTable we need to use syntax like: DataTable.Rows(index)("columnName"). If your Data Source doesn't say Microsoft Access Dataabase File (OLE DB) then click the Change button to see this screen: Select Microsoft Access Database File, then click Continue (or OK in some version of Visual Studio). However, we want the InsertProduct method to return the value returned by the query, not the number of rows affected. This tutorial contains examples of using SQL with VBA Access. How we return these results is important. By saving the connection string you'll avoid having it hard coded in the TableAdapter classes, which simplifies things if the connection string information changes in the future. The steps for adding the Northwind database to the Server Explorer depend on whether you want to use the SQL Server 2005 Express Edition database in the App_Data folder or if you have a Microsoft SQL Server 2000 or 2005 database server setup that you want to use instead. VB has a very easy method of getting Access data, use data adapters. After clicking Add, when prompted to add the DataSet to the App_Code folder, choose Yes. While this example required that we write three lines of code in our ASP.NET page's Page_Load event handler, in future tutorials we'll examine how to use the ObjectDataSource to declaratively retrieve the data from the DAL. In this tutorial we'll start from the very beginning and create the Data Access Layer (DAL), using typed DataSets, to access the information in a database. Accessing Data in Visual Studio Figure 17: Choose the Names for the TableAdapter Methods (Click to view full-size image). Tech support scams are an industry-wide issue where scammers trick you into paying for unnecessary technical support services. This will create a new DataTable and TableAdapter and walk you through the wizard we examined earlier in this tutorial. This may take the form of writing ADO.NET code in the ASP.NET page's code portion or using the SqlDataSource control from the markup portion. 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