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You won t find a more versatile utility than tar to create a file system based backup. In some cases, however, you don t need a backup based on a file system; instead, you want to create a backup of a complete device, or parts of it. This is where the dd command comes in handy. The basic use of the dd command is rather easy because it takes just two arguments: if= to specify the input file, and of= to specify the output file. The arguments to those options can be either files or block devices. So, the command dd if=/etc/hosts of=/home/somefile can be used as a complicated way to copy a file.

str &= "Number: " & ex.Errors(i).Number.ToString() str &= ControlChars.NewLine Next MessageBox.Show(str, "Database Exception")

dd is, strangely enough, short for convert and copy. Unfortunately, the cc command was already being used by something else and the developers choose to use dd instead.

Instead of creating a dataset: ' create dataset Dim ds As New DataSet() you create a data table: 'create data table Dim dt As DataTable = New DataTable And instead of filling a dataset: 'fill dataset da.Fill(ds, "products") you fill a data table: 'fill data table da.Fill(dt) Since a data table can hold only one table, notice that the Fill method doesn t accept the data table name as an argument. And, since you don t have to find a particular data table in a dataset, there is no need for 'get data table Dim dt As DataTable = ds.Tables("products") Otherwise, the code needs no changes.

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This example showed that the SqlException object carries detailed information about every SQL error in its Errors collection.

Summary

More interesting is the use of dd to copy a complete device. What would you think, for example, of the command dd if=/dev/cdrom of=/mycd.iso It would help you create an ISO file of the CD-ROM that s in the drive at that moment. You may wonder why not just copy the contents of your CD-ROM to a file with the name /mycd.iso. Well, the reason is, a CD-ROM, like most other devices, typically contains information that cannot be copied by a mere file copy. For example, how would you handle the boot

s Unless you really need to organize data tables in datasets so you can define relationships between Tip them, using one or more data tables instead of one (or more) datasets is easier to code and takes up fewer runtime resources.

In this chapter you saw how to handle exceptions thrown by ADO.NET and by SQL Server. In particular, you learned how to handle both single and multiple database errors with the System.Data.SqlClient.SqlException class. In the next chapter, you ll look at transactions and how to maintain database integrity when multiple users are working concurrently.

sector of a CD-ROM You can t find that as a file on the device because it s just the first sector. Because dd copies sector by sector, on the other hand, it will copy that information as well.

transaction is a set of operations performed so all operations are guaranteed to succeed or fail as one unit. A common example of a simple transaction is transferring money from a checking account to a savings account. This involves two operations: deducting money from the checking account and adding it to the savings account. Both must succeed together and be committed to the accounts, or both must fail together and be rolled back so that the accounts are maintained in a consistent state. Under no circumstances should money be deducted from the checking account but not added to the savings account (or vice versa). By using a transaction, both operations can be guaranteed to succeed or fail together. Transactions may comprise many individual operations and even other transactions. Transactions are essential for maintaining data integrity, both for multiple related operations and when multiple users update the database concurrently. In this chapter, we ll cover: When to use transactions The ACID properties of a transaction Coding transactions

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