.NET/Java PDF, Tiff, Barcode SDK Library

The runtime keeps the shadow assemblies in a directory where you can examine them. For the markup we ve listed above, let s put it in a project named Web03 and a file named WebForm1.aspx that uses a code-behind class named WebForm1. When we compile the project and request the page, we can navigate out to the following directory. C:\WINDOWS\Microsoft.NET\Framework\v2.0.50215\Temporary ASP.NET Files\web03\EightRandomDigits\AnotherEightRandomDigits In there you ll find any number of randomly named files with variously odd extensions. One of them is your generated shadow DLL from WebForm1.aspx. You can open this DLL using ILDASM. A snippet of what it will look like is displayed in Figure 3-5.

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One way to get a quick overview of the .NET Framework and the F# library is to simply look at the primary DLLs and namespaces contained in them. Recall from s 2 and 7 that DLLs correspond to the physical organization of libraries and that namespaces and types give the logical organization of a naming hierarchy. Let s look at the physical organization first. The types and functions we cover in this chapter are drawn from the DLLs in Table 10-1.

tatement caching is a JDBC 3.0 feature designed to improve performance by caching statements that are used repeatedly (e.g., in a loop) in the same session. By caching the statements, you prevent the overhead of repeated parsing of the cursor. In this chapter, you ll learn about statement caching, its different flavors in JDBC, and how it improves the performance of JDBC programs. As a background to the statement caching concept, you ll first go through a detailed discussion of cursors and ref cursors. You ll also learn about two other related caches, namely the PL/SQL cursor cache (which is the equivalent of JDBC statement caching in PL/SQL code) and session cached cursors.

Note We ll use the tkprof utility in this chapter, so if you aren t familiar with it I urge you to refer to the

Figure 3-5. An inside look at a shadow DLL generated by the ASP .NET Framework A quick glance through the structure of this assembly reveals how the markup is transformed into a code file. In the ASP namespace lives the class that s generated when the Framework transforms your markup into a class. Notice that it extends the class named WebForm1, which you partially defined in your code-behind, and partially provided by code generation of the Framework. That class exists in the WebDemo namespace (a namespace of our choosing from the code-behind) and it extends System.Web.UI.Page. Refer to Figure 3-2 for a

mscorlib.dll System.dll System.XML.dll System.Data.dll System.Drawing.dll System.Web.dll System.Windows.Forms.dll System.Query.dll

section on tkprof in 1 and the relevant section of Oracle Database Performance Tuning Guide and Reference (10g Release 1). In this chapter, you ll also use the runstats utility and its JDBC wrapper, JRunstats, which is discussed in 1.

Minimal system constructs including the types in the System namespace. Additional commonly used constructs in namespaces such as System and System.Text. See the corresponding namespace in Table 10-2. See the corresponding namespace in Table 10-2. See the corresponding namespace in Table 10-2. See the corresponding namespace in Table 10-2. See the corresponding namespace in Table 10-2. The foundation types for LINQ. From .NET 3.5 onward.

picture of this inheritance chain. What you re looking at in ILDASM (Figure 3-5) is the manifestation of that object graph within the Framework at runtime (where the proverbial rubber meets the road).

A cursor is a handle to a private SQL area that points to an entry in the shared pool consisting of the parsed statement. It consists of session-specific information, such as bind variables, the cursor state, the current position in the row in the case of a select statement, and so on.

Table 10-1. DLLs Containing the Library Constructs Referred to in This (Continued)

Cursors in PL/SQL (Explicit and Implicit)

Note There s actually a set of services in the Framework Class Library specifically designed to write code

Minimal constructs for F# assemblies. Called fslib.dll in earlier versions of F#. Called mllib.dll in earlier versions of F#.

Let s look at an example of a cursor in PL/SQL. Assume that we ve already created a table, t1, and inserted numbers from 1 to 5 into it: benchmark@ORA10G> create table t1 ( x number); Table created. benchmark@ORA10G> insert into t1 2 select rownum 3 from all_objects 4 where rownum <= 5;