ASP.NET Web PDF Document Viewer/Editor Control Library

The easiest way to construct an XML document is to simply call the Parse method of the XDocument or XElement class on a string: open SystemXmlLinq let xml = "<contacts> <contact> <name>John Smith</name> <phone type=\"home\">+1 626-123-4321</phone> </contact> </contacts>" let doc = XDocumentParse xml LinqToXml makes functional construction of XML possible This is done by making all XML constituents first-class values that can be created and embedded in each other The functional construction also requires that we treat these values uniformly Let s assume we create a few shorthand functions for various XML constructors:.

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Note Oracle Database 11g Release 1 and above have an asynchronous wait as described in 8,

Transactions. However, that style of commit has limited general-purpose use, as discussed. Commits in any end-user-facing application should be synchronous.

open System.Xml.Linq let let let let let xname n = XName.op_Implicit(n) xdoc (el : #seq<XElement>) = new XDocument(Array.map box (Array.of_seq el)) xelem s el = new XElement(xname s, box el) xatt a b = new XAttribute(xname a, b) |> box xstr s = box s Using these functions, we can construct the XML from the beginning of this section as follows: let doc = xdoc [ xelem "contacts" [ xelem "contact" [ (xelem "name" (xstr "John Smith")) (xelem "phone" [ xatt "type" "home" xstr "+1 626-123-4321" ]) ] ] ] This also includes the default document header (< xml version="1.0" encoding="utf-8" >). If this header is not needed, you can simply omit the top-level call to xdoc.

Now, earlier I mentioned that we were using a Java program and not PL/SQL for a reason and that reason is a PL/SQL commit-time optimization as discussed in 8, Transactions. I said that our call to LGWR is by default a synchronous one and that we wait for it to complete its write. That is true in Oracle 11g Release 2 and before for every programmatic language except PL/SQL. The PL/SQL engine, realizing that the client does not know whether or not a COMMIT has happened in the PL/SQL routine until the PL/SQL routine is completed, does an asynchronous commit. It does not wait for LGWR to complete; rather, it returns from the COMMIT call immediately. However, when the PL/SQL routine is completed, when we return from the database to the client, the PL/SQL routine will wait for LGWR to complete any of the outstanding COMMITs. So, if you commit 100 times in PL/SQL and then return to the client, you will likely find you waited for LGWR once not 100 times due to this optimization. Does this imply that committing frequently in PL/SQL is a good or OK idea No, not at all just that it is not as bad an idea as it is in other languages. The guiding rule is to commit when your logical unit of work is complete not before.

Note This commit-time optimization in PL/SQL may be suspended when you are performing distributed

Loading an existing XML document is straightforward; you can call the Load static method on either an XDocument or an XElement: let file name = Path.Combine(__YOUR_SOURCE_DIRECTORY__, name) XElement.Load (file "contacts.xml") Saving is just as easy, reusing doc from earlier: doc.Save (file "contacts2.xml") LinqToXML considers an XML document as a collection of XElement objects, each in a parent/child relationship. The root XElement s Parent property is null, even if it is embedded in an XDocument, which can simply be ignored as far as the data in the XML is concerned. XElement children can be obtained using the Elements() method, or its override, which expects an XName argument and returns all elements with a given name. let contacts = doc.Element(xname "contacts") // Get the first contact for elem in contacts.Elements() do printfn "Tag=%s, Value=%A" elem.Name.LocalName elem.Value

transactions or Data Guard in maximum availability mode. Since there are two participants, PL/SQL must wait for the commit to actually be complete before continuing. Also, it can be suspended by directly invoking COMMIT WORK WRITE WAIT in PL/SQL with database version 11g Release 1 and above.

To demonstrate that a COMMIT is a flat response time operation, we ll generate varying amounts of redo and time the INSERTs and COMMITs. As we do these INSERTs and COMMITs, we ll measure the amount of redo our session generates using this small utility function: ops$tkyte%ORA11GR2> create or replace function get_stat_val( p_name in varchar2 ) return number 2 as 3 l_val number; 4 begin 5 select b.value 6 into l_val 7 from v$statname a, v$mystat b 8 where a.statistic# = b.statistic# 9 and a.name = p_name; 10 11 return l_val; 12 end; 13 / Function created.