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' Create connection Dim conn As SqlConnection = New SqlConnection( _ "server = .\sqlexpress;" _ & "integrated security = true;" _ & "database = northwind" _ ) ' Create command Dim cmd As SqlCommand = conn.CreateCommand() ' Specify that a stored procedure is to be executed cmd.CommandType = CommandType.StoredProcedure cmd.CommandText = "sp_Select_All_Employees" Try ' Open connection conn.Open() ' Create data reader Dim rdr As SqlDataReader = cmd.ExecuteReader() ' Access nonexistent column Dim str As String = rdr.GetValue(20).ToString() ' Close reader rdr.Close() Catch ex As System.InvalidOperationException Dim str As String = "Source: " & ex.Source str &= ControlChars.NewLine str &= "Message: " & ex.Message str &= ControlChars.NewLine & ControlChars.NewLine str &= "Stack Trace: " & ex.StackTrace MessageBox.Show(str, "Specific Exception") Catch ex As System.Data.SqlClient.SqlException

CDDOM cd = (CDDOM) value; String xml = cd.getPriceData(); if ( xml == null ) { return; } InputSource source = new InputSource( new StringReader( xml ) );

Dim str As String = "Source: " str &= ControlChars.NewLine str &= "Exception Message: " & MessageBox.Show(str, "Database Catch ex As System.Exception Dim str As String = "Source: " str &= ControlChars.NewLine

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Here you ll change the city in the first row of the Employees table and persist the change in the database. 1. Add a new Visual Basic Console Application project named PersistChanges to your 13 solution. Rename Module1.vb to PersistChanges.vb. 2. Replace the code in PersistChanges.vb with the code in Listing 13-5. (This is a variation on ModifyDataTable.vb in Listing 13-4, with the nullability and insertion logic removed since they re irrelevant here.) Listing 13-5. PersistChanges.vb Imports System Imports System.Data Imports System.Data.SqlClient Module PersistChanges Sub Main() Dim connstring As String = _ ("Data Source=.\sqlexpress;" & _ "Integrated Security=True;" & _ "database=northwind") 'query Dim qry As String = "select * from employees " & _ "where country = 'UK'"

DOMParser parser = new DOMParser(); Instantiate the try { Parser and parse parser.parse( source ); org.w3c.dom.Document xmlDocument = parser.getDocument(); new DOMHandler( xmlDocument, document, options ); } catch (SAXException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); }

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

} private class DOMHandler { List<Field> mFieldList = new ArrayList<Field>(); Field mField; Field.Store mStore; Field.Index mIndex; Field.TermVector mVector; Float mBoost; public DOMHandler( org.w3c.dom.Document xmlDocument, Document document, LuceneOptions options ) { mStore = options.getStore(); mIndex = options.getIndex(); mVector = options.getTermVector(); mBoost = options.getBoost(); traverse( xmlDocument.getDocumentElement() ); for (Field field : mFieldList) { document.add( field ); } } private void traverse( Node node ) { if ( node == null ) {

return; } int type = node.getNodeType(); switch (type) { case Node.ELEMENT_NODE: { NamedNodeMap attrs = node.getAttributes();

s Testing whether a connection is open before attempting to close it isn t actually necessary. The Close Tip

'SQL to update employees Dim upd As String = "update employees " & _ "set city = @city " & _ "where employeeid = @employeeid" 'create connection Dim conn As SqlConnection = New SqlConnection(connstring) Try ' create data adapter Dim da As New SqlDataAdapter() da.SelectCommand = New SqlCommand(qry, 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") ' modify city in first row dt.Rows(0)("city") = "Wilmington" ' display rows Dim row As DataRow For Each row In dt.Rows Console.WriteLine("{0} {1} {2}", _ row("firstname").ToString().PadRight(15), _ row("lastname").ToString().PadLeft(25), row("city")) Next row ' update Employees ' ' create command Dim cmd As New SqlCommand(upd, conn) ' ' map parameters ' ' City cmd.Parameters.Add("@city", SqlDbType.NVarChar, 15, "city") ' ' EmployeeID Dim parm As SqlParameter = cmd.Parameters.Add _ ("@employeeid", SqlDbType.Int, 4, "employeeid") parm.SourceVersion = DataRowVersion.Original '

for (int x = 0; x < attrs.getLength(); x++) { Create a Field Node attrNode = attrs.item( x ); per attribute Field field = new Field( attrNode.getLocalName().toLowerCase(), attrNode.getNodeValue(), mStore, mIndex, mVector ); if ( mBoost != null ) field.setBoost( mBoost ); mFieldList.add( field ); } NodeList children = node.getChildNodes(); if ( children != null ) { int len = children.getLength(); for (int i = 0; i < len; i++) { traverse( children.item( i ) ); } } break; } case Node.TEXT_NODE: {

method doesn t throw any exceptions, and calling it multiple times on the same connection, even if it s already closed, causes no errors.

if ( node instanceof TextImpl ) { if ( !( ( (TextImpl) node ) .isIgnorableWhitespace() ) ) {

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