Updating xml nodes c
An alternative to the above operation would be to select the XML value into a new XML variable, make the change, and then select the variable value: , on the same XML value.
In other words, only one instance of modify() may be used at the same time on the XML value.
What if we needed to insert a new node into a specific Employee node in the Marketing department?
We can identify the correct employee by their ID attribute, using the @ID' argument: The Projects node has been inserted into the Employee node having ID #2.
This section presents an overview of the XQuery language.
For more information, consult a recent book on the language or refer to the standards documents that define it, all of which are available at XPath models an XML document as a tree of nodes.
Node values can be deleted by employing the text() function to specify that a value, not a node, is to be removed.
We've looked at examples of the XML DML extension, using the modify() XQuery method.It provides a set of operations that walk this tree and apply predicates and node-test functions.Applying an XPath expression to an XML document results in a set of nodes.We introduced all three operational keyword sets: insert, replace value of, and delete; and used them to perform some of the more common XML modification operations.We also pointed out some limitations and appropriate workarounds.