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public void set( String name, Object value, FieldBridge set method Document document, implementation LuceneOptions options ) { CD cd = (CD) value; String xml = cd.getPriceData(); if ( xml == null ) { Grab the XML data return; } InputSource source = new InputSource( new StringReader( xml ) );

It even gave you the option to continue or quit, but leaving this decision to users isn t a very good idea. After seeing what happened without handling the exception, you placed the call in a Try block:

try { from the XML SAXParserFactory factory = SAXParserFactory.newInstance(); SAXParser parser = factory.newSAXParser(); Create parser SaxHandler handler = and parse XML new SaxHandler( options, document ); parser.parse( source, handler ); } catch (SAXException s) { throw ( new SearchException( "unable to read cd price data", s ) ); } catch (ParserConfigurationException p) { throw ( new SearchException( "unable to read cd price data", p ) ); } catch (IOException i) { throw ( new SearchException( "unable to read cd price data", i ) ); }

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' 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 ' code for updating the database would come here Catch e As Exception Console.WriteLine(("Error: " + e.ToString)) Finally ' close connection conn.Close() End Try End Sub End Module 3. Make ModifyDataTable the startup project, and run it by pressing Ctrl+F5. You should see the results in Figure 13-6.

Try ' Open connection conn.Open() ' Create data reader Dim rdr As SqlDataReader = cmd.ExecuteReader() ' Close reader rdr.Close()

} /** * FieldBridge implementations must be thread safe. * So it is necessary to parse the xml in its own * instance of a handler to guarantee this. */ private class SaxHandler extends DefaultHandler { Map<String, List<Field> Field.Store Field.Index String> attrs; mFieldList = new ArrayList<Field>(); mStore; mIndex;

Field.TermVector mVector; Float mBoost; Document mDocument; StringBuilder text = new StringBuilder(); public SaxHandler( LuceneOptions options, Document document ) { mStore = options.getStore(); mIndex = options.getIndex(); mVector = options.getTermVector(); mBoost = options.getBoost(); mDocument = document; }

To handle the exception yourself, you coded two Catch clauses:

handler public void startElement( String uri, String localName, String qName, Attributes attributes ) { text.delete( 0, text.length() );

As before, you use a single data table in a dataset: ' get data table reference Dim dt As DataTable = ds.Tables("employees") Next, you can see an example of how you can change the schema information. You select the FirstName column, whose AllowNull property is set to false in the database, and you change it just for the purposes of demonstration to true: ' FirstName column should be nullable dt.Columns("firstname").AllowDBNull = True Note that you can use an ordinal index (for example, dt.Columns[1]) if you know what the index for the column is, but using * to select all columns makes this less reliable since the position of a column may change if the database table schema changes.

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")

if ( attributes.getLength() > 0 ) { attrs = new HashMap<String, String>(); for (int x = 0; x < attributes.getLength(); x++) { attrs.put( attributes.getQName( x ), attributes.getValue( x ) ); } } }

handler public void endElement( String uri, String localName, String qName ) { if ( qName.equals( "CD" ) ) { return; } else { Generate a field per Field field = XML element new Field( qName.toLowerCase(), text.toString(), mStore, mIndex, mVector ); if ( mBoost != null ) field.setBoost( mBoost ); mFieldList.add( field );

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