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The default constructor C contains predefined tags. As shown in listings 13.1 and 13.2, the default Formatter class surrounds the matching terms with HTML bold tags. So how can you modify the highlighting and make matching terms appear the way you want them There are three ways to accomplish this. The first and easiest way is to create an instance of the SimpleHTMLFormatter class by calling the constructor that takes two strings B. These two strings are the formatting code placed around the matching terms by the highlightTerm method. If what you want to accomplish is more complicated than that or you want additional functionality, you can do it the second way. It will be necessary to write your own Formatter class that s similar to the SimpleHTMLFormatter in listing 13.2, making sure that you also implement the Formatter interface by overriding the highlightTerm method C. This way you can add any functionality you wish E. Another option would be to extend the SimpleHTMLFormatter class and override the highlightTerm method D. Once you have your Formatter class, you can inject it when creating an instance of the Highlighter class by calling one of the two constructors that takes a formatter as a parameter:

You also added an ORDER BY clause, to sort the result set by first name within last name, to see that the kind of join has no effect on the rest of the query, and to see an alternate way to specify columns: by position number within the select list rather than by name. This technique is convenient (and might be the only way to do it for columns that are produced by expressions; for example, by the SUM function).

public Highlighter(Formatter formatter, Scorer fragmentScorer public Highlighter(Formatter formatter, Encoder encoder, Scorer fragmentScorer)

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This program is essentially the same as the first, DataLooper.cs (Listing 12-1). Here, you define two separate queries and then combine them: 'query1 Dim sql1 As String = "select companyname,contactname " & _ "from customers where " & _ "companyname like 'A%'" 'query2 Dim sql2 As String = "select firstname," & _ "lastname from employees" 'combine queries Dim sql As String = sql1 + sql2 The only other change is that you loop through result sets. You nest the loop that retrieves rows inside one that loops through result sets: Do While rdr.Read() ' Print one row at a time Console.WriteLine("{0} : {1}", rdr(0), rdr(1)) End While Console.WriteLine("".PadLeft(60, "=".ToString)) Loop While rdr.NextResult() We have you choose only two character-string columns per query to simplify things. Extending this to handle result tables with different numbers of columns and column data types is straightforward.

Let s move on to scoring, a topic that is probably near and dear to your heart. As we discussed at length in chapter 12, modifying the way documents are scored can be a painstaking process. The next utility class can help ease that pain.

order by 2, 1

When we utilize a Boolean query to search for multiple terms, the use of the Boolean keyword NOT eliminates documents containing the NOTed term from the returned results. If we query our DVD index for all documents containing spielberg and NOT war, we would retrieve movie descriptions of all Steven Spielberg movies except for those that contained the term war in their description. So, we would not have Saving Private Ryan and Schindler s List returned in the query results. What if we wanted these results returned, but we wanted them demoted to further down in the returned list,

Note that the OrderID column for the new employee is NULL, because no value exists for it. The same holds true for any columns from the table that don t have matching rows (in this case, the right table). You can obtain the same result by placing the Employees table on the right and the Orders table on the left of the join operator and changing the operator to RIGHT OUTER JOIN. (Try it!) Remember to flip the correlation names, too. The keyword OUTER is optional and is typically omitted. Left and right joins are always outer joins.

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