.NET/Java PDF, Tiff, Barcode SDK Library

from XML documents or extract data in XML. Data represented as XML carries various tags and meta-information that helps to identify what sort of data is contained within. This also amounts to a larger size, but typically this can be compensated for by applying compression on the XML text. As an example, consider the following classic XML example (contacts.xml): <contacts> <contact> <name>John Smith</name> <phone type="home">+1 626-123-4321</phone> </contact> </contacts> One way to represent and work with XML documents is via the XML Document Object Model (DOM) contained in the System.Xml namespace, and you saw how to work with this model in 9. Using the XML DOM constructors and methods, you can create the previous XML as follows: open System.Xml let doc = new XmlDocument() let rootNode = doc.CreateElement "contacts" doc.AppendChild rootNode |> ignore let contactNode = doc.CreateElement "contact" let nameNode = doc.CreateElement "name" let nameText = doc.CreateTextNode "John Smith" let phoneNode = doc.CreateElement "phone" phoneNode.SetAttribute("type", "home") let phoneText = doc.CreateTextNode "+1 626-123-4321" nameNode.AppendChild nameText |> ignore contactNode.AppendChild nameNode |> ignore contactNode.AppendChild phoneNode |> ignore phoneNode.AppendChild phoneText |> ignore rootNode.AppendChild contactNode |> ignore Here you are building up an XML document in a bottom-up fashion via a series of method calls that mutate the main XML document object. This means various XML elements cannot be constructed without this document container object and also construction by mutation makes the shape of the XML hard to read. Using XmlWriter is a bit more readable: let doc = new XmlDocument() let writer = doc.CreateNavigator().AppendChild() writer.WriteStartElement "contacts" writer.WriteStartElement "contact" writer.WriteElementString ("name", "John Smith") writer.WriteStartElement "phone" writer.WriteAttributeString ("type", "home") writer.WriteString "+1 626-123-4321" writer.WriteEndElement() writer.Close()

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Now we ll look at an example in which we load a text file into a BLOB variable and print the contents of the file in SQL*Plus. This also demonstrates how you can print a BLOB column that actually contains text data. First, we declare some variables and initialize the BLOB variable by using the dbms_lob.createtemporary() method: benchmark@ORA10G> declare 2 l_blob blob; 3 l_bfile bfile; 4 5 l_read_buf varchar2(200); 6 l_amount_to_read binary_integer := 100; 7 l_offset number := 1; 8 begin 9 dbms_lob.createtemporary( l_blob, true ); Next, we create the BFILE locator using the BFILENAME function as follows: 10 l_bfile := bfilename( directory => 'MY_DIR', filename => 'test_bfile.txt' );

The second method of extending the pipeline is to implement an HttpModule Modules are Microsoft s intentional design for reusing pre- and post-processors across IIS applications The last technique you looked at (that of inheriting from HttpApplication in a standalone assembly and reusing across IIS applications) has a serious limitation that modules don t have: You can only use one class per application (even though you can reuse that same class across several applications) HttpModules are designed so that several can be plugged into a single IIS application The extensions that Microsoft adds to the pipeline that you examined previously are implemented as HttpModules So by default, any IIS application has about a dozen modules plugged in and extending the pipeline Modules are designed to be plugged into the pipeline using the webconfig file You can add a module to all IIS applications by adding it to the web.

Note that as mentioned in the preceding comments, the directory argument should contain the directory object we created (my_dir) in capital letters and inside single quotes for the preceding code to work. Also, the bfilename argument should point to a real file, as it does in this case.

Here you don t have to worry about creating the structure of the document; instead, you simply output each element in a sequence. XmlWriter will also take care of the closing tags, even if you forget them before closing the writer.

Note If you want to create a directory object with a name in mixed-case or lowercase letters, you

LINQ to XML (LinqToXml) offers a new and easier way to work with XML than using the traditional XML DOM The SystemXmlLinq namespace contains everything you need to construct, load and save, manipulate, and query over XML documents You can reference the DLL containing this namespace using this: #I @"c:\Program Files\Reference Assemblies\Microsoft\Framework\v35" #r "SystemXmlLinqdll" Being a data format for tree-like structures, the XML trees are made up by a collection of XNode objects Structurally, there are two XNode descendants that can contain other nodes (and thus inherit from XContainer, a subclass of XNode): XDocument and XElement Therefore, all XML documents are represented either as an XDocument with nested XElement objects or simply as a collection of nested XElements.