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A full data backup lets you recover from a disaster as of the last backup. The following script from SQLQuery8_f0316_f0317.sql simulates a disaster by erasing NWCopy s primary data file. Without a backup, a disaster like the one simulated in the following script can cause you to lose all the data and database objects in a database! The script starts by showing the syntax for making a backup for NWCopy. This process begins by changing the database context to the master database. This is a good general practice when working with creating or restoring a database. The next statement executes the sp_addumpdevice systemstored procedure to create a backup device. A backup device points at storage for the backup file(s), which can be either on disk or tape. The backup device has both a logical name and a physical name. The logical name is NWCopyBK_1. The physical backup device name is c:\prosseapps\ chapter03\NWCopyBK_1.bak. The BACKUP DATABASE statement names the NWCopy database and specifies the NWCopyBK_1 backup device. After creating the backup, the script confirms the availability of the database by performing a SELECT statement against the Shippers table in NWCopy. Then, the script causes the server to pause a second before erasing the primary data file, which is northwnd.mdf in the c:\prosseapps\chapter03 path. Erasing a database s primary data file obviously makes the database unavailable. However, by invoking the RESTORE DATABASE statement, the script permits a SELECT statement against the Shippers table to succeed again. For a full data restore, all you have to do is specify the database name (NWCopy) and the logical backup device name (NWCopyBK_1) in the RESTORE DATABASE statement.

' Create connection Dim conn As SqlConnection = New SqlConnection(connString) Try ' Open connection conn.Open() ' Create command Dim cmd As SqlCommand = New SqlCommand(sql, conn) ' Create data reader Dim rdr As SqlDataReader = cmd.ExecuteReader() ' Get column names Console.WriteLine( _ "Column Name: {0} {1}", _ rdr.GetName(0).PadRight(25), _ rdr.GetName(1) _ ) ' Get column data types Console.WriteLine( _ "Data Type: {0} {1}", _ rdr.GetDataTypeName(0).PadRight(25), _ rdr.GetDataTypeName(1) _ ) Console.WriteLine() ' Loop through result set While rdr.Read Console.WriteLine( _ " {0} {1}", _ rdr.GetString(0).PadRight(25), _ rdr.GetString(1) _

To filter the rows returned from a query, you will add a WHERE clause to your SELECT statement. The database engine processes the WHERE clause second, right after the FROM clause. The WHERE clause will contain expressions, called predicates, that can be evaluated to TRUE, FALSE, or UNKNOWN. You will learn

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USE master EXEC sp_addumpdevice 'disk', NWCopyBK_1, 'c:\prosseapps\chapter03\NWCopyBK_1.bak' BACKUP DATABASE NWCopy TO NWCopyBK_1 GO SELECT * FROM NWCopy..Shippers GO WAITFOR DELAY '00:00:01' GO xp_cmdshell 'erase c:\prosseapps\chapter03\northwnd.mdf' GO RESTORE DATABASE NWCopy FROM NWCopyBK_1 GO SELECT * FROM NWCopy..Shippers GO

) End While ' Get number of columns Console.WriteLine() Console.WriteLine( _ "Number of columns in a row: {0}", _ rdr.FieldCount _ ) ' Get info about each column Console.WriteLine( _ "'{0}' is at index {1} and its type is: {2}", _ rdr.GetName(0), _ rdr.GetOrdinal("contactname"), _ rdr.GetFieldType(0) _ ) Console.WriteLine( _ "'{0}' is at index {1} and its type is: {2}", _ rdr.GetName(1), _ rdr.GetOrdinal("contacttitle"), _ rdr.GetFieldType(1) _ )

Differential backups and restores are more flexible than full data backups. As a result, the syntax and procedures for differential backups and restores is more complicated. The presentation for this topic starts with a demonstration of how to create two differential backups for NWCopy. Before creating the first backup, the sample inserts a new row in the Shippers table. Then, the sample inserts another row in the Shippers table before creating the second differential back. Three recovery operations follow. First, the sample shows how to recover the data in the first differential backup, which has four rows in the Shippers table. Next, you learn how to recover the data in the second differential backup, which has five rows in the Shippers table. Finally, a third recovery occurs after a disaster (again simulated by erasing the primary data file).

' Close data reader rdr.Close() Catch e As Exception ' Display error Console.WriteLine("Error: " & e.ToString) Finally ' Close connection conn.Close() End Try End Sub End Module

more about UNKNOWN in the Working with Nothing section later in the chapter. The WHERE clause syntax is as follows: SELECT <column1>,<column2> FROM <schema>.<table> WHERE <column> = <value>; Listing 2-5 shows the syntax and some examples demonstrating how to compare a column to a literal value. The following examples are from the AdventureWorks2008 database unless specified otherwise. Be sure to type each query into the query window and execute the statement to see how it works. Make sure you understand how the expression in the WHERE clause affects the results returned by each query. Notice that tick marks, or single quotes, have been used around literal strings and dates. Listing 2-5. How to Use the WHERE Clause USE AdventureWorks2008; GO --1 SELECT CustomerID, SalesOrderID FROM Sales.SalesOrderHeader WHERE CustomerID = 11000; --2 SELECT CustomerID, SalesOrderID FROM Sales.SalesOrderHeader WHERE SalesOrderID = 43793; --3 SELECT CustomerID, SalesOrderID, OrderDate FROM Sales.SalesOrderHeader WHERE OrderDate = '2001-07-01'; --4 SELECT BusinessEntityID, LoginID, JobTitle FROM HumanResources.Employee WHERE JobTitle = 'Chief Executive Officer'; Each query in Listing 2-5 returns rows that are filtered by the expression in the WHERE clause. Be sure to check the results of each query to make sure that the expected rows are returned (see Figure 2-5). Each query returns only the information specified in that query s WHERE clause.

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