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Another nice source for information that is often overlooked is the documentation that is installed for most software packages in the directory /usr/share/doc/. Beneath this directory you ll find a long list of subdirectories that all contain some usage information. In some cases, the information is really short and not very good, but, in other cases, thorough and helpful information is available. Often this information is available in ASCII text format and can be viewed with less or any other utility that is capable of handling clear text. In many cases, the information in /usr/share/doc is stored in a compressed format. You can recognize this format by the extension .gz. To read files in this format, you can use zcat and pipe the output of that to less, which allows you to browse through it page by page. For example, if you see a file with the name changelog.gz, use zcat changelog.gz | less to read it. In other cases, you will find the documentation in HTML format, which can only be displayed properly with a browser. If this is the case, it is good to know that you don t necessarily need to start a graphical environment to see the contents of the HTML file because Ubuntu Server comes with the w3m browser, which is designed to run from a nongraphical environment. In w3m you can use the arrow keys to browse between hyperlinks. To quit the w3m utility, use the q command.

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:

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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)

Summary

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

You caught your (first) database exception with the following code:

This chapter has prepared you for the work you will be doing at the command line. Because even a modern Linux distribution like Ubuntu Server still relies heavily on its configuration files and the commands to manage them, this is all important information. The real work, though, starts in 3, where you ll learn how to perform some of the most important administration tasks.

' 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 ' insert employees ' ' create command Dim cmd As New SqlCommand(ins, conn) ' ' map parameters cmd.Parameters.Add("@firstname", _ SqlDbType.NVarChar, 10, "firstname") cmd.Parameters.Add("@lastname", _ SqlDbType.NVarChar, 20, "lastname") cmd.Parameters.Add("@titleofcourtesy", _ SqlDbType.NVarChar, 25, "titleofcourtesy") cmd.Parameters.Add("@city", _ SqlDbType.NVarChar, 15, "city") cmd.Parameters.Add("@country", _ SqlDbType.NVarChar, 15, "country") ' ' insert employees da.InsertCommand = cmd da.Update(ds, "employees") Catch e As Exception Console.WriteLine(("Error: " + e.ToString)) Finally ' close connection conn.Close() End Try End Sub End Module 3. Make PersistAdds the startup project, and run it by pressing Ctrl+F5. You should see the results in Figure 13-8.

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