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You should always encode cookie or query string values by using Server.HtmlEncode before displaying the value in an HTML webpage to any user. Server.HtmlEncode replaces HTML code with special characters that a web browser cannot process. For example, Server.HtmlEncode replaces a < sign with <. If you display the value in a browser, the user sees the < sign, but the browser does not process any HTML code or client-side scripts. To provide extra protection, the runtime throws a System.Web.HttpRequestValidationException if it detects HTML or client-side scripting in a query string. Therefore, you cannot pass HTML code in a query string. This can be disabled by an administrator, however, so you should not rely on it for protection.

Note: The data template specified by the ContentTemplate property defines the UI layout for the Content property of the context object. In the preceding code, the Content property is a string; therefore, the TextBlock is simply bound to the Content property itself. As the user interacts with the pop-up window, the context object is updated according to the bindings defined in the pop-up window or in the data template used to display the Content property of the context object. After the user closes the pop-up window, the context object is passed back to the view model, along with any updated values, via the callback method. In the confirmation example used in the MVVM RI, the default

Summary

This is the last time you ll see the XML headers (doctype and schema) in this book. They should always be there, but for conciseness we ll drop them in future examples. This is the only configuration property we need to set to get started with Hibernate Search. Even this property is defaulted to ./, which is the JVM current directory, but the authors think it s more appropriate to explicitly define the target directory. Another property can be quite useful, especially in test environments: the Lucene directory provider. Hibernate Search stores your indexes in a file directory by default. But it can be quite convenient to store indexes only in memory when doing unit tests, especially if, like the authors, you prefer to use in-memory databases like HSQLDB, H2, or Derby to run your test suite. It makes the tests run faster and limits side effects between tests. We ll discuss this approach in section 5.1.3 and section 9.5.2.

It is difficult to find the query plan for a particular query using the preceding query because the query text is contained only deep inside the XML showplan. The following extension to the previous query extracts the sequence number (the column named No) and the query text (the Statement Text column) from the showplan using the Xquery value method. Each batch has a single sql_handle; therefore, specifying ORDER BY sql_handle, [No] ensures the output rows for the batch containing multiple SQL statements are displayed one after another in the order they appear in the batch. WITH XMLNAMESPACES ('http://schemas.microsoft.com/sqlserver/2004/07/showplan' AS sql) SELECT C.value('@StatementId','INT') AS [No], C.value('(./@StatementText)','NVARCHAR(MAX)') AS [Statement Text], qplan.query_plan AS [Query Plan] FROM (SELECT DISTINCT plan_handle FROM sys.dm_exec_query_stats) AS qstats CROSS APPLY sys.dm_exec_query_plan(qstats.plan_handle) AS qplan CROSS APPLY query_plan.nodes('/sql:ShowPlanXML/sql:BatchSequence/sql:Batch/sql:Statements/ descendant::*[attribute::StatementText]') AS T(C) ORDER BY plan_handle, [No];

Hashes (also known as associative arrays) exist as a concept in many programming languages, such as Perl, Java, and Python (where they are called dictionaries). Hashes are data structures that let you associate keys with values. Ruby s implementation of hashes is straightforward and should be familiar to both Perl and Python developers, despite some minor syntax changes. For example: fred = { 'name' => 'Fred Elliott', 'age' => 63, 'gender' => 'male', 'favorite painters' => ['Monet', 'Constable', 'Da Vinci'] } fred refers to a basic hash that contains four elements that have keys of 'name', 'age', 'gender', and 'favorite painters'. You can refer back to each of these elements easily: puts fred['age']

The code runs an in nite loop that reads the contents of the Employees table into a temp table. Because the code doesn t specify the NOLOCK hint and the environment is read-write, the storage engine uses an index order scan. The code breaks from the loop when the number of rows read is different than the expected number (four). In case the scan reads the same row twice, this code returns ve rows in the output:

Summary

TABLE 5-2

You want to insulate your EJBs from the implementation of classes that encapsulate the services of your application.

A leaf node is a node for which the right value is greater than the left value by 1 (no subordinates). Add this lter to the subtree query s WHERE clause. As you can see, the nested sets solution allows for dramatically faster identi cation of leaf nodes than other solutions using a NOT EXISTS predicate.