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These two XML parsers utilize completely different methodologies for dissecting XML and have widely varying resource requirements As the title of this chapter implies, the Lucene and Hibernate Search projects have made many utilities and classes available for you to use and therefore save time and work It would be a great benefit to these projects and also to yourself if you were to get involved in improving both projects The authors recommend it We ve given you all the fundamental and practical knowledge you ll need to use Hibernate Search efficiently in your application and implement the most suitable search engine for your users Don t forget, Hibernate is a very dynamic project with lots of new and incremental features coming at each release Expect the framework to provide more higher-level features with newer versions and probably more control of lower-level features also.

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

' 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.

Things you re doing manually today might be automated tomorrow Be sure to check the reference documentation and change logs on a regular basis..

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An exception of type System.Data.SqlClient.SqlException is thrown when SQL Server returns a warning or error. This class is derived from System.SystemException and is NotInheritable so it can t be inherited, but it has several useful members that can be interrogated to obtain valuable information about the exception. An instance of SqlException is thrown whenever the .NET data provider for SQL Server encounters an error or warning from the database. Table 13-1 describes the properties of this class that provide information about the exception.

This appendix aims at being a quick reference guide of the Hibernate Search artifacts: annotations, APIs, and Lucene query APIs. For each artifact, a quick description and a reference to the book section or URL are provided.

Gets the severity level of the error returned from the SqlClient data provider. The severity level is a numeric code that s used to indicate the nature of the error. Levels 1 to 10 are informational errors, 11 to 16 are user-level errors, and 17 to 25 are software or hardware errors. At level 20 or greater, the connection is usually closed. Gets a collection of key-value pairs that contain user-defined information. The HRESULT of the error. Contains one or more SqlError objects that have detailed information about the exception. This is a collection that can be iterated through. The help file associated with this exception. Gets the exception instance that caused the current exception. Gets the line number within the T-SQL command batch or stored procedure that generated the exception. The text describing the exception. The number that identifies the type of exception. The name of the stored procedure that generated the exception. The name of the computer running the instance of SQL Server that generated the exception. The name of the provider that generated the exception.

You add an INSERT statement and change the name of the original query string variable from sql to ins in order to clearly distinguish it from this statement: 'SQL to insert employees Dim ins As String = "insert into employees " & _ "(firstname,lastname,titleofcourtesy,city,country)" & _ "values(@firstname,@lastname,@titleofcourtesy,@city,@country)" You replace the update comment in the try block with quite a bit of code Let s look at it piece by piece Creating a command is nothing new, but notice that you use the insert SQL variable (ins), not the query one (sql): ' insert employees ' ' create command Dim cmd As New SqlCommand(ins, conn) Then you configure the command parameters The five columns for which you ll provide values are each mapped to a named command parameter.

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