Updating xml nodes c
When the average database developer is obliged to manipulate XML, either shredding it into relational format, or creating it from SQL, it is often done 'at arms length'.
To do so, you need to serialize the // First read the XML file and parse DOMParser parser = new DOMParser(); parser.parse("mydocument.xml"); Document doc = Document(); // Modify the XML ...If the value is a list of values, the update statement replaces the old value with the list.In modifying a typed XML instance, must be an expression that can be atomized. The following examples of the replace value of XML DML statement illustrates how to update nodes in an XML document.Sometimes, XML Data must be created directly from existing tables.SQL Server provides plenty of XML-related tools, but how can we know which ones to use, and when?Note that the result of the insert sequence is either a single text node or an empty sequence.
If the insert sequence is empty, all descendants of the target are deleted.
In the blog, I wrote some helper methods to locate XML elements and return their values in a less verbose way.
This proved to be one of my most popular blog entries to date.
An expression consists of a target node (the node we want to alter) and additional information like insertion nodes, a QName, etc. Insert enables you to insert a sequence of nodes into a single target node.
Several modifiers are available to specify the exact insert location: insert into as first/as last, insert before/after and insert into.
However, one reader commented that it would be nice to add helper methods to easily create or modify XML, not just parse it. I've added two new helper methods to the code I presented last time: The code works by first locating the specified node within the list of nodes provided.