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Here, you ll build a console application that uses typed accessors. 1. Add a new Visual Basic Console Application project named TypedAccessors to your 12 solution. Rename Module1.vb to TypedAccessors.vb. 2. Replace the code in TypedAccessors.vb with the code in Listing 12-3. Listing 12-3. TypedAccessors.vb Imports System Imports System.Data Imports System.Data.SqlClient Module TypedAccessors 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 productname, " & _ "unitprice,unitsinstock,discontinued " & _ "from products" 'create connection Dim conn As SqlConnection = New SqlConnection(connstring)

public void testMoreLikeThis() throws Exception { session = Search.createFullTextSession(openSession()); Transaction tx = session.beginTransaction(); StringReader sr = new StringReader(likeText); reader = getReader(); try { MoreLikeThis mlt = new MoreLikeThis(reader); mlt.setFieldNames(moreLikeFields); mlt.setMaxQueryTerms(2); mlt.setMinDocFreq(1); mlt.setAnalyzer(new StandardAnalyzer()); mlt.setMaxWordLen(8); mlt.setMinWordLen(7); Call the mlt.setMinTermFreq(1);

Joins can be quite complicated. Let s revise this one to simplify things a bit. Enter the following query into SSMSE and execute it. You should see the results in Figure 11-13.

like(Reader)

select o.orderid, o.customerid, e.lastname from orders o inner join employees e on o.employeeid = e.employeeid

method Query query = mlt.like(sr); System.out.println(query.toString());

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Try 'Open connection conn.Open() 'create command Dim cmd As SqlCommand = New SqlCommand(sql, conn) 'create data reader Dim rdr As SqlDataReader = cmd.ExecuteReader 'loop through result set While (rdr.Read) Console.WriteLine("{0} {1} {2} {3}", _ rdr.GetString(0).PadRight(35), _ rdr.GetDecimal(1), _ rdr.GetInt16(2), _ rdr.GetBoolean(3)) End While 'close data reader rdr.Close() Catch e As Exception Console.WriteLine("Error Occurred:" & e.ToString) Finally ' Close connection conn.Close() End Try End Sub End Module 3. Make TypedAccessors the startup project, and run it by pressing Ctrl+F5. You should see the results in Figure 12-3. (Only the first 20 rows are displayed in the figure.)

You ve simplified the table references by providing a correlation name for each table. (This is somewhat similar to providing column aliases, but correlation names are intended to be used as alternative names for tables. Column aliases are used more for labeling than for referencing columns.) You can now refer to Orders as o and to Employees as e. Correlation names can be as long as table names and can be in mixed case, but obviously the shorter they are, the easier they are to code. You used the correlation names in both the select list:

org.hibernate.search.FullTextQuery hibQuery = session.createFullTextQuery(query,

Product.class); hibQuery.setProjection(FullTextQuery.DOCUMENT, FullTextQuery.SCORE, FullTextQuery.DOCUMENT_ID); results = hibQuery.list(); assert results.size() == 6:"incorrect result count"; for (Object[] result : results) { Document doc = (Document) result[0]; assertTrue(doc.get("description").indexOf( "salesman") > 0 || doc.get("description").indexOf( "misfire") > 0); } tx.commit(); } finally { session.close(); } } private IndexReader getReader() { SearchFactory searchFactory = session.getSearchFactory(); DirectoryProvider provider = searchFactory.getDirectoryProviders(Product.class)[0]; readerProvider = searchFactory.getReaderProvider(); return readerProvider.openReader(provider); } }

and the ON clause:

You query the Products table for ProductName, UnitPrice, UnitsInStock, and Discontinued: Dim sql As String = "select productname, " & _ "unitprice,unitsinstock,discontinued " & _ "from products" The reason we have you choose these columns is to deal with different kinds of data types and show how to use relevant typed accessors to obtain the correct results. 'loop through result set While (rdr.Read) Console.WriteLine("{0} {1} {2} {3}", _ rdr.GetString(0).PadRight(35), _ rdr.GetDecimal(1), _ rdr.GetInt16(2), _ rdr.GetBoolean(3)) End While Looking at Table 12-1, you can see that you can access nvarchar, money, smallint, and bit data types in SQL Server with the GetString, GetDecimal, GetInt16, and GetBoolean accessor methods, respectively. This technique is fast and completely type safe. By this, we mean that if implicit conversions from native data types to .NET types fail, an exception is thrown for invalid casts. For instance, if you try using the GetString method on a bit data type instead of using the GetBoolean method, a Specified cast is not valid exception will be thrown.

The like document B is defined. As we discussed, this could be obtained in a number of ways, especially from a prior query. Once we have this defined, we feed it to a StringReader C in preparation for having the MoreLikeThis class analyze it. We instantiate the MoreLikeThis class D and set the parameters we want the class to use to extract the terms from the like document. The query is returned after calling the MoreLikeThis.like(Reader) method E. In this example the generated query is

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