.NET/ASP.NET/C#/VB.NET PDF Document SDK

Ref Cursors (or Cursor Variables)

Table 10-2 shows the primary namespaces in .NET Framework DLLs from Table 10-1. In some cases, parts of these libraries are covered elsewhere in this book. We ve noted these cases in the table. For example, 4 introduced portions of the .NET I/O library from the System.IO namespace.

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A ref cursor or cursor variable is a pointer to a cursor. Unlike the implicit and explicit cursors that are hard-wired to specific queries at compile time, a ref cursor can be tied to different queries during the same execution of the program. For example, consider the following procedure created after we log in as the user SCOTT: scott@ORA10G> create or replace procedure demo_refcursor( p_query_selector in varchar2, 2 p_criterion in varchar2, p_ref_cursor in out sys_refcursor ) 3 is 4 l_empno emp.empno%type; 5 l_ename emp.ename%type; 6 l_job emp.job%type; 7 begin 8 if( 'ename' = p_query_selector ) then 9 open p_ref_cursor for 10 select empno, ename, job 11 from emp 12 where ename like '%'||p_criterion||'%'; 13 elsif( 'job' = p_query_selector ) then 14 open p_ref_cursor for 15 select empno, ename, job 16 from emp

Types and methods that define commonly used value and reference data types, events and event handlers, interfaces, attributes, and processing exceptions, supporting data-type conversions, mathematics, application environment management, and runtime supervision of managed and unmanaged applications. See 3 for many of the basic types in this namespace. Types that can be used to represent the elements and structure of a source code document. Not covered in this book.

Markup is very easy to generate programmatically, whereas source code is not As we look forward to the next generation of the Windows operating system (named Windows Vista), Microsoft plans on creating a new model for Windows development as well, called XAML, or XML Application Markup Language This subsystem, named Windows Presentation Foundation, will be available for Windows 2003 and Window XP, and is a declarative model for Windows-based application development The real power in XAML lies in the fact that code is relatively static It s like taking all of the declarations and initializations of variables out of your imperative code and moving them into a document of their own In XAML, there will be a code-behind model as well, so the more complex, dynamic code will still be written there Microsoft plans to couple a page-based development model with the richness in functionality of the Windows development model.

17 18 19 20

Table 10-2. Namespaces in the DLLs from Table 10-1, with MSDN Descriptions (Continued)

where job like '%'||p_criterion||'%'; end if; end; /

Go to http://msdnmicrosoftcom/Longhorn to see some concept videos of the type of application that will be produced with this new paradigm If there are any trends in computer science to be paying attention to today, it s this declarative model of programming coupled with Aspect Oriented Programming, or AOP You first saw AOP on the Windows platform in Microsoft Transaction Server In this application-hosting environment you could set properties on objects specifying, for example, their transactional requirements and behavior This would affect the run-time characteristics of the type without requiring any modification to the imperative source code NET attributes extend this model by promoting attributes to first-class citizens within the Common Language Runtime (CLR) and NET languages themselves Anytime you add the [Serialization] or [WebMethod] attributes to a class definition, you re using AOP.

Types that define various nongeneric collections of objects, such as lists, queues, and bit arrays Partially covered in the section Using Further F# and NET Data Structures later in this chapter Types that define generic collections See 4 and the section Using Further F# and NET Data Structures later in this chapter Types that are used to implement the runtime and designtime behavior of components and controls See 11 Types that provide the programming model for handling configuration data See 15 Types that represent the ADONET database access architecture See 15 Types that allow you to interact with system processes, event logs, and performance counters See 18 Types that allow access to GDI+ basic graphics functionality More advanced functionality is provided in the System DrawingDrawing2D, SystemDrawingImaging, and System DrawingText namespaces See 11.