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' Create command Dim cmd As SqlCommand = conn.CreateCommand() ' Specify that a stored procedure is to be executed cmd.CommandType = CommandType.StoredProcedure ' Deliberately fail to specify the procedure ' cmd.CommandText = "sp_Select_All_Employees" Try ' Open connection conn.Open() ' Create data reader Dim rdr As SqlDataReader = cmd.ExecuteReader() ' Close reader rdr.Close() Catch ex As System.Data.SqlClient.SqlException Dim str As String = "Source: " & ex.Source str &= ControlChars.NewLine str &= "Exception Message: " & ex.Message MessageBox.Show(str, "Database Exception") Catch ex As System.Exception Dim str As String = "Source: " & ex.Source str &= ControlChars.NewLine str &= "Exception Message: " & ex.Message MessageBox.Show(str, "Non-Database Exception") Finally If conn.State = ConnectionState.Open Then MessageBox.Show("Finally block closing the connection", "Finally") conn.Close() End If End Try

@Entity @Indexed @Analyzer(impl=StandardAnalyzer.class) @ClassBridge(name = "", index = Index.TOKENIZED, store = Store.YES, impl = SaxExampleBridge.class) public class CD { private private private private Integer id; String title; String artist; String priceData;

s Note Changes you make to a dataset aren t automatically propagated to a database. To save the changes in a database, you need to connect to the database again and explicitly perform the necessary updates.

@Id @DocumentId public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } @Field(index=Index.TOKENIZED, store=Store.YES) public String getTitle() { return title; } public void setTitle(String title) { this.title = title; } @Field(index=Index.TOKENIZED, store=Store.YES) public String getArtist() { return artist; } public void setArtist(String artist) { this.artist = artist; } public String getPriceData() { return priceData; }

9. Run the program with Ctrl+F5. Click the ADO.NET Exception-1 button, and you see the message box in Figure 13-3. Click OK.

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public void setPriceData(String priceData) { this.priceData = priceData; } }

It would be highly unusual to miss setting the CommandText property. However, this was an expedient way to cause an ADO.NET exception. You specified that the command was for a stored procedure call, but you didn t specify the stored procedure to call:

At B we specify a bridge class to parse the XML data that s contained in the priceData property C. This property holds the year the CD was released, the company producing it, and the CD s price, as in the following XML fragment:

Let s update a row and add a row in a data table. 1. Add a new Visual Basic Console Application project named ModifyDataTable to your 13 solution. Rename Module1.vb to ModifyDataTable.vb. 2. Replace the code in ModifyDataTable.vb with the code in Listing 13-4.

' Specify that a stored procedure is to be executed cmd.CommandType = CommandType.StoredProcedure ' Deliberately fail to specify the procedure ' cmd.CommandText = "sp_Select_All_Employees"

Bridge classes are a perfect fit for processing this kind of data (refer to chapter 4 if you need to brush up on bridge classes). We ll split the three items of information contained in the priceData property into individual fields of a document for storing in the index. Our SaxExampleBridge class extends the DefaultHandler class we mentioned before and thereby specifies the callback methods that the parser will invoke when the related event occurs. This class is given in listing 13.15.

public class SaxExampleBridge extends DefaultHandler implements FieldBridge {

So, when you called the ExecuteReader method, you got an exception, as shown in Figure 13-2. Though it was an unhandled exception, it still gave you an accurate diagnostic:

Listing 13-4. ModifyDataTable.vb Imports System Imports System.Data Imports System.Data.SqlClient Module ModifyDataTable Sub Main() Dim connstring As String = _ ("Data Source=.\sqlexpress;" & _ "Integrated Security=True;" & _ "database=northwind") 'create command (with both text and connection) Dim sql As String = "select * from employees " & _ "where country = 'UK'" 'create connection Dim conn As SqlConnection = New SqlConnection(connstring) Try ' create data adapter Dim da As New SqlDataAdapter() da.SelectCommand = New SqlCommand(sql, conn) ' create and fill dataset Dim ds As New DataSet() da.Fill(ds, "employees") ' get data table reference Dim dt As DataTable = ds.Tables("employees") ' FirstName column should be nullable dt.Columns("firstname").AllowDBNull = True ' modify city in first row dt.Rows(0)("city") = "Wilmington" ' add a row Dim newRow As DataRow = dt.NewRow() newRow("firstname") = "Roy" newRow("lastname") = "Beatty" newRow("titleofcourtesy") = "Sir" newRow("city") = "Birmingham" newRow("country") = "UK" dt.Rows.Add(newRow)

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