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Catalyst s authentication system provides a standardized way of dealing with these three parts from the application perspective, while retaining the flexibility to change how each portion is handled behind the scenes. That s a long way of saying you can use what you need now, and when your application needs to grow, you can switch to new modules without rewriting all of your application code. The way Catalyst accomplishes this is by providing a core authentication module that handles the application interaction and by delegating the three portions of authentication to other modules. Many of these modules are available for free on CPAN to interface with just about any source of authentication information you can think of. There are also detailed instructions on how to write your own, in the rare case where none of the available modules meets your needs (see Catalyst::Plugin::Authentication::Internals for details). As you might guess, Catalyst s authentication system delegates each part of the authentication to a different module or set of modules. This allows each piece of the system to focus on doing its one very particular job. In the sections that follow, we ll cover authentication realms: the system that determines the identity of the user, the use of browser sessions to achieve persistent state in the application (see 2 on the HTTP protocol for the background to this), and role-based authorization for finer-grained access control (e.g., adding an administrator user with more power than a regular user). asp.net code 39 barcode ASP . NET Code 39 Barcode Generator SDK - BarcodeLib.com
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Creator.dll for C# developers to generate and create Code 39 on TIFF, PDF, Word, Excel and ... NET Tiff Viewer: view, annotate multipage Tiff images in ASP . This problem can also be solved with an IN operator, as shown in Listing 9-10. The query results are omitted. Listing 9-10. Alternative Formulation for Listing 9-9 select e.* from employees e where e.empno in (select o.trainer from offerings o where o.course = 'SQL') You can also use a join to solve the problem, as shown in Listing 9-11. This is probably the most obvious approach, although the choice between writing joins or subqueries is highly subjective. Some people think bottom up and prefer subqueries; others think top down and prefer to write joins. Listing 9-11. Another Alternative Formulation for Listing 9-9 select DISTINCT e.* from employees e join offerings o on e.empno = o.trainer where o.course = 'SQL' Notice the DISTINCT option in the SELECT clause. Investigate what happens if you remove the DISTINCT option in Listing 9-11. You ll find that the query result will consist of three rows, instead of two. So far, we have considered only subqueries in the WHERE clause. However, you can use subqueries in other SQL statement components, such as the SELECT and FROM clauses. In the next sections, we will look at subqueries in these other clauses. NULLs with EXISTS AND IN in subquery results often cause problems for people writing SQL for Oracle database systems, especially for those used to writing SQL for other database systems. Not only can nulls in subquery results cause confusion, but they can lead to incorrect results. There are several key concepts to keep in mind: NULL is not data, but rather a condition of data being unknown. NULL = NULL, NULL != NULL or NULL IN (NULL) always evaluates to UNKNOWN, which is neither TRUE nor FALSE. It is not possible to join two rows with NULLs in the join column. code 39 barcode generator asp.net ASP . NET Code 39 Generator generate, create barcode Code 39 ...
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