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After reviewing the code for our application, the next step is to examine the data. We have intentionally left the structure of the XML simple so that you can follow the flow of data through the application. Listing 6.6 is the menu.xml file containing menu data for the application.

This code first checked for a possible SQL injection attempt (the input string must be a valid binary string) . The code then converted the character string ( 0x4775696E6E657373 in this example) to the binary value 0x4775696E6E657373 . Unfortunately, you could not use this technique to convert a binary value to a character string . Prior to SQL Server 2008 you could use a scalar user-defined function (UDF) called fn_varbintohexstr to achieve this:

DECLARE @sql AS NVARCHAR(MAX), @b AS VARBINARY(MAX), @s AS VARCHAR(MAX); SET @b = 0x4775696E6E657373; SET @s = sys.fn_varbintohexstr(@b); SELECT @s;

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Note The fn_varbintohexstr function is undocumented and unsupported . This code converted the binary value 0x4775696E6E657373 to the character string 0x4775696E6E657373 . SQL Server 2008 introduces a new feature that makes such conversions very easy to handle . The CONVERT function now supports the third argument (style) when converting from a character string to a binary value or the other way around . Style 0 is the default, representing the pre-2008 behavior . Styles 1 and 2 introduce new functionality where the hex digits are preserved, but the type is converted . When converting from binary to character, use style 1 if you want the result string to include the prefix 0x, and style 2 otherwise . For example, run the following code to demonstrate both styles:

In the My Display Picture area, click Change Picture. In the My Personal Picture dialog box, in the list of images, click Orange Daisy, and then click OK. The image appears to the right of your messages when you start a conversation with your contacts.

< xml version="1.0" encoding="UTF-8" > <menu> <option>Diagnose Hardware Problem</option> <option>View Availability of Replacement System</option> <option>Order Replacement Parts</option> <option>View Common System Problems</option> <machines>

SELECT CONVERT(VARCHAR(20), 0x4775696E6E657373, 1) AS bin_to_prefixed_char, CONVERT(VARCHAR(20), 0x4775696E6E657373, 2) AS bin_to_nonprefixed_char;

This generates the following output:

bin_to_prefixed_char bin_to_nonprefixed_char -------------------- ----------------------0x4775696E6E657373 4775696E6E657373

When converting from character to binary, use style 1 when the source string contains the 0x prefix, and style 2 when it doesn t . For example, run the following code:

<machine id="ominco4000">Omnico 4000</machine> <machine id="amaya">Amaya Workstation</machine> <machine id="computech">Computech ATX</machine> <machine id="xpad">ACME xPad</machine> </machines> </menu>

SELECT CONVERT(VARBINARY(10), '0x4775696E6E657373', 1) AS prefixed_char_to_bin, CONVERT(VARBINARY(10), '4775696E6E657373', 2) AS nonprefixed_char_to_bin;

This generates the following output:

prefixed_char_to_bin nonprefixed_char_to_bin ---------------------- ----------------------0x4775696E6E657373 0x4775696E6E657373

Listing 6.7 is amaya.xml, which contains a detailed list of problems with the Amaya machine. Given the scope of our application, it is not necessary to validate these files against DTDs or XML Schemas. This would certainly be necessary in a production application. Additionally, a backup of the amaya.xml file should be made each time the list is updated using Amaya s web service. In the event that the update fails, you can revert to the previous version.

As I mentioned earlier, legacy versions of SQL Server did not support defining local variables of a large object type . You could not store a Unicode string longer than 4,000 characters (8,000 bytes) in a local variable that you fed to sp_executesql as input . So EXEC had an advantage over sp_executesql in this respect because it supported concatenating multiple variables, each up to the maximum supported size . In SQL Server 2008 you can define local variables of a large object type, so this is no longer an issue . Use the NVARCHAR(MAX) type for sp_executesql, and you can construct a batch that is up to 2 GB in size . Earlier I demonstrated using EXEC to execute a long batch . Here s code that accomplishes the same thing using sp_executesql:

DECLARE @sql AS NVARCHAR(MAX) = N'PRINT ''This output was generated by' + REPLICATE(CAST(N'.' AS NVARCHAR(MAX)), 100000) + '''' + NCHAR(13) + NCHAR(10) + N'PRINT ''a long batch.'''; EXEC sp_executesql @sql; SELECT LEN(@sql) AS batch_length;

This generates the following output, shown here in abbreviated form:

< xml version="1.0" encoding="UTF-8" > <amaya> <machine>amaya</machine> <last_updated>06-01-01</last_updated> <issues> <issue id="0001">Machine Is Not Receiving Power</issue> <issue id="0002">LCD Stopped Working</issue> <issue id="0003">Abnormally Low Battery Life</issue> </issues> </amaya>

This output was generated by... a long batch. batch_length -------------------100059

You re not limited to the pictures that come with Windows XP. You can use a personal picture as your display picture by clicking Browse in the My Personal Picture dialog box, locating the desired picture, and then clicking OK.

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