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Designing a Data Access Strategy
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} catch (Exception ex) { MessageBox.Show(ex.Message); } } 'VB Private Sub btnWebService_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnWebService.Click Try Dim ws As New SQL.GetEngineeringList 'Use the credentials of the user that is logged in ws.Credentials = System.Net.CredentialCache.DefaultCredentials Dim ds As New DataSet Dim objList As Object() = ws.GetEngineeringEmployees 'Loop through the array of objects returned until 'you get to the dataset Dim o As Object For Each o In objList If o.GetType.ToString = "System.Data.DataSet" Then ds = o End If Next DataGridView1.DataSource = ds.Tables(0) ws = Nothing Catch ex As Exception MessageBox.Show(ex.Message) End Try
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12. Save the Lab2 project by going to the File menu and selecting Save All. 13. Right-click the Lab2 project from Solution Explorer, and select Set As Startup Project. 14. Press Ctrl+F5 to build the project without debugging. Ensure that the project builds successfully. Form1 should appear after the project compiles and executes. You should see an Open Web Service button; click this button. The data results are displayed in the dataViewGrid control, as shown in Figure 1-8.
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Form1 as it displays a list of all engineering employees from the AdventureWorks
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1. Which protocol enables you to expose SQL Server data to heterogeneous clients 2. When creating an HTTP endpoint, which option must be set to allow consumers to execute ad hoc queries against the endpoint 3. When creating an HTTP endpoint, which option must be set to allow consumers to view a WSDL document associated with the endpoint 4. When executing a query against a linked server, how is the data source identified in the query statement Quick Check Answers 1. HTTP is the protocol, and you can create HTTP endpoints using the CREATE ENDPOINT statement. This enables you to expose SQL Server data as a Web service to clients that might not be running on the Windows platform. 2. You must set the BATCHES=ENABLED option in the CREATE ENDPOINT statement to allow consumers to execute ad hoc queries. Which queries can be executed will still be controlled by the level of access granted to the consumer making the request. 3. You must set the WSDL = DEFAULT option in the CREATE ENDPOINT statement for the WSDL document to be generated. This document can be used by consumers to generate a proxy that is used to connect a client application to the endpoint. 4. The linked server name is identified through a four-part name whose parts appear as follows: linked_server_name.catalog.schema.object_name
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Designing a Data Access Strategy
Lesson 3: Designing a Data Access Object Model
Estimated lesson time: 45 minutes
Database developers must often decide between several data access object models. To select an appropriate data access object model, he or she must know what type of data needs to be retrieved. This lesson will cover the different models available and what considerations should be made when selecting one.
What is the ADO Object Model
The ActiveX Data Objects (ADO) object model is a data access technology that defines the objects used to access the data. It provides a high-level interface, so you can get to your data as quickly and easily as possible. And, it lets you access data from a wide variety of data sources. The model has evolved over the years; some developers might remember using previous data models known as Data Access Objects (DAO) or Remote Data Objects (RDO). These models relied on a complex and deep hierarchical data structure. The ADO object model is a flatter model that simplifies many of the steps involved with connecting and accessing data from a data source. You may recall from Lesson 1 that there are two versions of ADO available. There is the ADO that is part of the MDAC and then there is ADO.NET, which is part of the .NET Framework. Both use similar concepts regarding connections and some of the other basic objects, but they use different structures and models. For both data access methods, you must make a choice between using a connected or disconnected model. This will determine the type of data object into which you return your data. The difference between a connected and disconnected model has to do with whether a connection to the data source is maintained after the data object has been populated. Each method has distinct advantages and disadvantages; which method to use depends on the application requirements.
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