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

Note I would like to emphasize that external LOBs (BFILEs) do not participate in transactions. Any support for integrity, data recovery, and so on must be provided by the underlying file system as governed by the operating system in which the actual data exists.

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There are two primary ways to write code to extend the pipeline. The one you choose depends on the scope of the extension you d like to do, as one way is IIS application specific, while the other can be applied to any number of IIS applications. The first way is to add a global.asax file to a Web project. The code behind for the global.asax defines a class that inherits from the HttpApplication class. Instances of this class then become the objects that handle all requests for that IIS application. Because of the use of the global.asax, which is deployed to a specific IIS application root, it s not a method that s best suited for reuse across applications and servers. To get reuse out of extensions to the

Table 12-1 summarizes the typical use of each of the LOB types. Table 12-1. Large Object Types and Their Descriptions

Many of the operators you have encountered so far can be coded as recursive functions For example, the following is one possible implementation of Listlength: let rec length l = match l with | [] -> 0 | h :: t -> 1 + length t Likewise, many functions such as Listmap are implemented using recursive functions Recursion is sometimes used as a means of programming particular patterns of control This is usually used in contexts where functions have deliberate side effects.

Character Large Object. Typically used to store unstructured strings in the database character set format. Characters in the database character set are in a nonvarying width format. National Character Set Large Object. Stores character strings in the National Character Set data format (supports characters of varying widths). Binary Large Object. Typically used to store binary data (graphic images, multimedia files, Microsoft Word documents, etc.). External Binary File. Useful for accessing read-only data stored outside the data base from the database.

For example, the following code repeatedly fetches the HTML for a particular web page, printing each time it is fetched: let rec repeatFetch url n = if n > 0 then let html = http url printfn "fetched <<< %s >>> on iteration %d" html n repeatFetch url (n-1) Recursion is powerful but not always the ideal way to encode either data manipulations or control constructs, at least if other techniques are readily available For example, the previous program could be implemented using a for loop, as explained in 4, which would be clearer Likewise, explicit recursion should typically be avoided if an operator is available that captures the pattern of recursion being used For example, many explicit loops and recursive functions can be replaced by uses of functions such as Listmap and Arraymap.

pipeline, you create an HttpModule. You can leverage it from any IIS application via a configuration file. We provide a detailed discussion of modules in a bit, but first: a look at the global.asax.

A LOB consists of a locator and its value. A LOB locator is a reference to the LOB value. When you use a LOB in an operation such as passing a LOB as a parameter, you are actually passing a LOB locator. For the most part, you can work with a LOB instance in your application without being concerned with the semantics of LOB locators.

A typical error with recursion is to forget to decrement a variable at the recursive call For example, the author incorrectly entered the following nonterminating function when writing this chapter: let rec badFactorial n = if n <= 0 then 1 else n * badFactorial n You should always check your recursive calls to ensure that the function is tending toward termination, that is, that the arguments are approaching the base case This is called wellfounded recursion You can define multiple recursive functions simultaneously by separating the definitions with and These are called mutually recursive functions.

distinct LOB locator and also a distinct copy of the LOB value. This is in contrast with the case of initialized