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Looking at table 13.3 we can see that there are definitely some things that we should be aware of. Best-case memory usage for the document was the Crimson parser, and it required memory with a ratio of 1230/197, or 6.24/1! That s more than six times the size of the document. Worst-case usage required 2500/197, or 12.7/1. That s more than double the best-case usage. What can we conclude from this Well, today memory is cheap, but depending on the size of your XML documents, if you use DOM you re going to need a lot of it. The authors realize that this test data is a little dated since the tests were performed in 2002, and the DOM parsers have probably, over time, gotten better at their resource utilization, but we can guarantee that they have not gotten that much better! Hopefully, this discussion of the pros and cons has shed some light on the different parsers and will help you with your decisions, but we believe that you should consider becoming familiar with both. This will also help you decide which one to use under which circumstances. This chapter has shown that if you have a problem and are in need of a solution, in all probability someone else has had that same problem. It s like that old adage, No matter how good you are, there is always someone better. Only in this case it is more like, No matter what the problem is, someone has probably already solved it. Don t just start writing code; look around. With today s search engine capabilities, it s hard to believe someone when he says, I couldn t find anything on it.

When an exception of type System.InvalidOperationException is thrown, this Catch clause executes, displaying the source, message, and stack trace for the exception. Without this specific Catch clause, the generic Catch clause would have handled the exception. (Try commenting out this Catch clause and reexecuting the code to see which Catch clause handles the exception.) Next, you ran the program for a nonexistent stored procedure:

13.4 Summary

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Listing 13-6. PersistAdds.vb Imports System Imports System.Data Imports System.Data.SqlClient Module PersistAdds 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'" 'SQL to insert employees Dim ins As String = "insert into employees " & _ "(firstname,lastname,titleofcourtesy,city,country)" & _ "values(@firstname,@lastname,@titleofcourtesy,@city,@country)" '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") ' add a row Dim newRow As DataRow = dt.NewRow() newRow("firstname") = "Roy" newRow("lastname") = "Beatty" newRow("titleofcourtesy") = "Sir" newRow("city") = "Birmingham" newRow("country") = "UK" dt.Rows.Add(newRow)

' Specify that a stored procedure is to be executed cmd.CommandType = CommandType.StoredProcedure cmd.CommandText = "sp_Select_No_Employees"

In this chapter you ve seen that Lucene maintains an eclectic mixture of noncore code in two separate repositories, the Sandbox and third-party contributions The Sandbox is dedicated to code donated by the core developers along with other personnel interested in the Lucene project, and it is a repository for new ideas The code is not actively maintained It consists of such applications as synonym tools, a large variety of foreign language analyzers, and many more utilities that will keep you busy for quite a while The third-party contributions section deals mainly with classes and applications that extract text from various file formats such as Adobe Systems s PDF, Microsoft Word and Excel, and XML files Some of these applications are free and some are not We also examined two different methods of parsing XML documents, the serial SAX and the DOM.

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