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654 ChAPTER 11
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Sample of Visual Basic Code Public WithEvents da As New SqlDataAdapter() Public sb As New System.Text.StringBuilder() Private Sub rowUpdated(ByVal sender As Object, _ ByVal e As SqlRowUpdatedEventArgs) Handles da.RowUpdated sb.Append("Rows: " & e.RecordsAffected.ToString() & vbCrLf) End Sub Protected Sub ButtonUpdate_Click(ByVal sender As Object, _ ByVal e As System.EventArgs) Handles ButtonUpdate.Click Dim pubs As ConnectionStringSettings pubs = ConfigurationManager.ConnectionStrings("PubsData") Dim connection As DbConnection = New SqlConnection() connection.ConnectionString = pubs.ConnectionString Dim cmd As SqlCommand = _ CType(connection.CreateCommand(), SqlCommand) cmd.CommandType = CommandType.Text cmd.CommandText = "SELECT * FROM publishers" Dim pubsDataSet As New DataSet("Pubs") da.SelectCommand = cmd Dim bldr As New SqlCommandBuilder(da) da.Fill(pubsDataSet, "publishers") 'Modify data here For Each dr As DataRow In pubsDataSet.Tables("publishers").Rows dr("pub_name") = "Updated Toys " _ + DateTime.Now.Minute.ToString() _ + DateTime.Now.Second.ToString() Next da.UpdateBatchSize = 3 da.Update(pubsDataSet, "publishers") Dim lbl As Label = GetLabel(275, 20) lbl.Text = sb.ToString() End Sub Sample of C# Code public SqlDataAdapter da = new SqlDataAdapter(); public System.Text.StringBuilder sb = new System.Text.StringBuilder(); private void rowUpdated(object sender, SqlRowUpdatedEventArgs e) { sb.Append("Rows: " + e.RecordsAffected.ToString() + "\r\n"); }
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Lesson 2: LINQ and ADO.NET
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ChAPTER 11
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protected void ButtonUpdate_Click(object sender, EventArgs e) { //event subscription is normally placed in constructor but is here //to encapsulate the sample da.RowUpdated += new SqlRowUpdatedEventHandler(rowUpdated); ConnectionStringSettings pubs = ConfigurationManager.ConnectionStrings["PubsData"]; DbConnection connection = new SqlConnection(pubs.ConnectionString); SqlCommand cmd = (SqlCommand)connection.CreateCommand(); cmd.CommandType = CommandType.Text; cmd.CommandText = "SELECT * FROM Publishers"; da.SelectCommand = cmd; DataSet pubsDataSet = new DataSet("Pubs"); SqlCommandBuilder bldr = new SqlCommandBuilder(da); da.Fill(pubsDataSet, "publishers"); //Modify data here foreach (DataRow dr in pubsDataSet.Tables["publishers"].Rows) { dr["pub_name"] = "Updated Toys " + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString(); } da.UpdateBatchSize = 3; da.Update(pubsDataSet, "publishers"); //if event subscription is in the constructor, no need to //remove it here. . .. da.RowUpdated -= new SqlRowUpdatedEventHandler(rowUpdated); Label lbl = GetLabel(275, 20); lbl.Text = sb.ToString(); }
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A typed DataSet is a DataSet that is based on strongly typed objects that exist at design time (and are typically auto-generated by Visual Studio). Typed DataSets allow you to program against the actual table and field schemas for your database instead of relying on strings. For example, if you have a DataSet called salesData that includes a company table, you can access this table as follows.
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Sample of Visual Basic Code Dim companyTable as DataTable = salesData.Tables("Company") Sample of C# Code DataTable companyTable = salesData.Tables["Company"];
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However, if you misspell the name of the table, an exception is thrown at run time. This can be problematic. The same is true for fields in the table. Each is typically accessed through a string value. In addition, each field is only type-checked at run time. You can overcome all of these issues at compile time by creating a typed DataSet.
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656 ChAPTER 11
Connecting to and Querying Data with LINQ
A typed DataSet inherits from the DataSet object. You define a property for each of the tables in the DataSet. You do the same for each field in the table. For example, a typed DataSet class might contain a property called Company that represents the Company table and has its schema as properties. You can access this table as shown in the following code. In this example, a compile-time error is generated if Company is not spelled correctly.
Sample of Visual Basic Code Dim companyTable as DataTable = vendorData.Company Sample of C# Code DataTable companyTable = vendorData.Company;
You can provide an XML Schema Definition (XSD) file to generate a typed DataSet class. You can also use the DataSet Editor to graphically create and modify an XSD file, which, in turn, can be used to generate the typed DataSet class. Figure 11-3 shows the DataSet Editor working with the pubs database. You can drag tables from the database onto the design surface. Visual Studio then generates the appropriate typed DataSet class for you to work with.
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