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If the subquery returns one or more rows, the EXISTS test will return TRUE Likewise, if the query returns no rows, NOT EXISTS will return TRUE For instance, in Listing 7-51, we show an example of using EXISTS in a correlated subquery to return all customers who have placed orders Again, the subquery is correlated because the subquery references a table available in the outer query Listing 7-51 Example of Using EXISTS in a Correlated Subquery mysql> SELECT cfirst_name, clast_name -> FROM Customer c -> WHERE EXISTS ( -> SELECT * FROM CustomerOrder co -> WHERE cocustomer_id = ccustomer_id -> ); +------------+-----------+ | first_name | last_name | +------------+-----------+ | John | Doe | | Jane | Smith | | Mark | Brown | +------------+-----------+ 3 rows in set (0.

So either add the alert_syslog plug-in or change the configuration of your alert_syslog plug-in as I ve specified here. You will need to restart your Snort daemon to activate the configuration change.

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his is the final chapter dealing with NET reflection in the book, and it gives you the opportunity to see how attributes, metadata, and reflection are used within the NET Framework In this chapter, we ll investigate the various classes, interfaces, and other data types defined in the SystemComponentModel namespace The NET component model provides an extremely rich programming model for creating and using component classes We ll explain exactly what component class means shortly The aim of the chapter is to show how you can use reflection and attribute-based techniques to write programs that are generic and can handle any kind of component The chapter provides an effective case study in writing code that makes use of attribute-laden objects, and offers some insight into the way the developers at Microsoft have employed attributes within NET.

00 sec) There are some slight differences here between using = ANY and the shorter IN subquery, like the ones shown in Listing 7-50 and 7-48, respectively ANY will transform the subquery to a list of values, and then compare those values using an operator to a column (or, more than one column, as you ll see in the results of tabular and row subqueries, covered in the next section) However, EXISTS does not return the values from a subquery; it simply tests to see whether any rows were found by the subquery This is a subtle, but important distinction.

Once you have configured Snort, you need to configure syslog-NG to send along your Snort alerts to the Nagios server. I won t detail the entire process of configuring syslog-NG, NSCA, and Nagios but I ve assumed you have followed the instructions in the syslog-NG and Nagios section. Example 9-12 shows a filter, destination, and log statement for your Snort alerts. Example 9-12. syslog-NG Configuration for Sending Snort Alerts to Nagios filter f_snort { level(alert) and facility(authpriv) and program(snort); }; destination d_snort_nagios { pipe("/var/run/nagios.pipe" template("$HOST,'$PROGRAM',2,'$MSG'\n") template_escape(no)); }; log { source(local); filter(f_snort); destination(d_snort_nagios); }; In Example 9-12 the filter statement selects all messages generated by the Snort program of alert priority level and sent to the authpriv facility. I could also be more selective than this and only process certain types of Snort alerts using the filter option, match, which allows you to perform regular expression matching on the content of the syslog message. Here s an example:

This chapter is divided into two halves: The first half of the chapter introduces the important interfaces, classes, and attributes in the SystemComponentModel namespace You ll see how to use reflection to interrogate a type about its runtime capabilities, such as obtaining a list of its properties and events This enables you to write your code in a very flexible and extensible manner Rather than constraining your applications to deal with specific types containing predefined properties and events, you can write generic code that determines these capabilities dynamically at runtime You ll also see how to determine whether a type can be converted to other data types by using a converter class This is an essential ingredient if you want to use types generically in your application; you must be able to interrogate types to determine whether their data can be converted to or from other types.

In an EXISTS subquery, MySQL completely ignores what columns are in the subquery s SELECT statement, thus all of the following are identical: WHERE EXISTS (SELECT * FROM Table1) WHERE EXISTS (SELECT NULL FROM Table1) WHERE EXISTS (SELECT 1, column2, NULL FROM Table1) The standard convention, however, is to use the SELECT * variation The EXISTS and NOT EXISTS expressions can be highly optimized by MySQL, especially when the subquery involves a unique, non-nullable key, because checking for existence in an index s keys is less involved than returning a list of those values and comparing another value against this list based on a comparison operator Likewise, the NOT EXISTS expression is another way to represent an outer join condition Consider the code shown in Listings 7-52 and 7-53 Both return categories that have not been assigned to any products Listing 7-52.

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