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s Note A data view is a dynamic representation of the contents of a data table. Like a SQL view, it doesn t

Try It Out: Handling an ADO.NET Exception (Part 1)

for (int x = 0; x < paragraphs.length; x++) { Dvd dvd = new Dvd(); dvd.setDescription(paragraphs[x]); dvd.setId(x + 1);

To handle an ADO.NET exception: 1. In VBE, create a new Windows Application project named 13. When Solution Explorer opens, save the solution. 2. Rename the 13 project AdoNetExceptions. Change the Text property of Form1 to ADO.NET Exceptions.

session.save(dvd); } tx.commit(); session.clear(); } }

We won t cover all aspects of data views here, as they re beyond the scope of this book. However, to show how they can be used, we ll present a short example that uses a data view to dynamically sort and filter an underlying data table. 1. Add a new Visual Basic Console Application project named DataViews to your 13 solution. Rename Module1.vb to DataViews.vb. 2. Replace the code in DataViews.vb with the code in Listing 13-3. Listing 13-3. DataViews.vb Imports System Imports System.Data Imports System.Data.SqlClient Module DataViews Sub Main() Dim connstring As String = _ ("Data Source=.\sqlexpress;" & _ "Integrated Security=True;" & _ "database=northwind")

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Once you have an InputStream on the Word file, use a WordExtractor instance B to get the text as an array of paragraphs C. The rest is a Java exercise. We re not quite done. Before we finish with this chapter we re going to examine the process of indexing a simple text file to Hibernate Search.

3. Add a tab control to the form. Change the Text property of TabPage1 to ADO.NET. Add a button to the tab page, and change its Text property to ADO.NET Exception-1. Add a label to the right of this button, and change its Text property to Incorrect ADO.NET code will cause an exception. Add a second button to the tab page, and change its Text property to ADO.NET Exception-2. Add a label to the right of this button, and change its Text property to Accessing a nonexistent column will

This is the simplest example in this chapter for a couple of reasons:

4. Change the second tab page s Text property to Database. The layout should look like Figure 13-1.

'query Dim sql As String = "select contactname,country from customers" 'create connection Dim conn As SqlConnection = New SqlConnection(connstring) Try 'create data adapter Dim da As SqlDataAdapter = New SqlDataAdapter da.SelectCommand = New SqlCommand(sql, conn) 'create and fill dataset Dim ds As DataSet = New DataSet da.Fill(ds, "customers") ' get data table reference Dim dt As DataTable = ds.Tables("customers") ' create data view Dim dv As New DataView(dt, "country = 'Germany'", "country", _ DataViewRowState.CurrentRows) ' display data from data view Dim drv As DataRowView For Each drv In dv Dim i As Integer For i = 0 To dv.Table.Columns.Count - 1 Console.Write((drv(i) + ControlChars.Tab)) Next i Console.WriteLine() Next drv Catch e As Exception Console.WriteLine("Error Occurred:" & e.ToString) Finally ' Close connection conn.Close() End Try End Sub End Module 3. Make DataViews the startup project, and run it by pressing Ctrl+F5. You should see the results in Figure 13-5.

It has no dependencies other than the Java libraries and obviously Hibernate Search. No extraction process is necessary, because it is already plain text.

5. Add the following Imports statement for the SQL Server data provider namespace to Form1.cs:

In the example given in listing 13.13 we re going to use a text file called, ingeniously enough, file.txt. It contains the first text listing of our DVD description files from the end of chapter 12. We ll read the file, construct an entity, and index it.

public class TestReadTextFile extends SearchTestCase { public void testTestFile() throws Exception { FullTextSession session = Search.getFullTextSession(openSession()); Transaction tx = session.beginTransaction(); File f = new File("ch13/src/com/manning/hsia/dvdstore/file1.txt"); buildIndex(f.getAbsolutePath(), session, tx); tx = s.beginTransaction(); try { Query query = new TermQuery(new Term( description , "salesman")); org.hibernate.search.FullTextQuery hibQuery = s.createFullTextQuery(query, Dvd.class); List<Dvd> results = hibQuery.list(); assertEquals("wrong number of hits", 1, results.size()); assertTrue(results.get(0).getDescription() .indexOf("salesman") >= 0); tx.commit(); } finally { s.close(); } } private void buildIndex(String filename , FullTextSession session, Transaction tx) {

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