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SQL Server MVP Erland Sommarskog said it best: dynamic SQL is a curse and a blessing. Put simply, dynamic SQL is a means of constructing SQL statements as strings in your server-side (or even client-side) applications and executing them dynamically, on the fly. When used properly, dynamic SQL can be used to generate complex queries at runtime, in some cases improve performance, and do tasks that just aren t possible (or are extremely difficult) in standard, nondynamic T-SQL. The downside is that there are numerous ways to shoot yourself in the foot with dynamic SQL. If not used properly, dynamic SQL can open up security holes in your system big enough to drive a truck through. Even as I began writing this book, I received a newsletter highlighting a recent spate of SQL injection attacks against over half a million web pages, including some United Nations owned web sites. In this section, I will discuss the various methods of executing dynamic SQL, as well as some of the risks and rewards that Erland alludes to.

And unless you ve configured a Recovery Agent (more on this in a minute), those files are pretty much gone for good, which won t make for a happy user as I m sure you can imagine What s worse, if a Windows XP user forgets his logon password and needs to have it reset, this will also remove his access to any encrypted files..

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The most basic form of server-side dynamic SQL is achieved by simply passing a SQL query or other instruction as a string to the EXECUTE statement (often abbreviated EXEC). The EXECUTE statement accepts a char, varchar, nchar, or nvarchar constant, variable, or expression that contains valid T-SQL statements. Listing 18-7 shows the most basic form of dynamic SQL with an EXECUTE statement and a string constant. Listing 18-7. Basic EXECUTE Statement EXECUTE (N'SELECT ProductID FROM Production.Product'); As you can see, there is no real advantage to performing dynamic SQL on a string constant. A simple SELECT statement without the EXECUTE would perform the same function and return the same result. The true power of dynamic SQL is that you can build a SQL statement or query dynamically and execute it. Listing 18-8 demonstrates how this can be done. Listing 18-8. More Complex Dynamic SQL Example DECLARE @min_product_id int = 500; DECLARE @sql_stmt nvarchar(128) = N'SELECT ProductID ' + N'FROM Production.Product ' + N'WHERE ProductID >= ' + CAST(@min_product_id AS nvarchar(10)); EXECUTE (@sql_stmt); Now that I ve given you this simple code sample, let s explore all the things that are wrong with it.

4 looks at configuring a directory services server that can be used to provide a centralized repository for locating objects, storing usernames, and networking computers 5 looks at using Mac OS X as a traffic cop There are two sides to this coin The first is to set up the server to protect itself by leveraging the built-in firewall The second is to use Mac OS X as a router so that it can provide a network for the rest of your devices 6 covers Dynamic Host Configuration Protocol (DHCP), which allows administrators to dynamically assign IP addresses to devices on their networks, freeing you from having to keep track of IP assignments on expansive spreadsheets or manually assigning addresses to each device.

In Listing 18 -9, the variable @sql_stmt contains the dynamic SQL query. The query is built dynamically by appending the minimum product ID to the WHERE clause. This is not the recommended method of performing this type of query, and I show it here to make a point.

So how do you configure the EFS process so that your users don t end up shooting themselves in the foot One way is to instruct your users to export a copy of their private key to a floppy disk. That way if their hard drive is ever lost, they can use the exported private key to retain access to their encrypted files. This is a wizard-driven task that the user can launch from the Certificates MMC snap-in, just by right-clicking the certificate and selecting Export.

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