Table of Contents
BDB XML provides APIs for deleting, replacing, and modifying documents that are stored in containers. This chapter discusses these activities.
You can delete a document by calling
XmlContainer::deleteDocument()
.
This method can operate either on a document's name or on an
XmlDocument
object. You might want to use an
XmlDocument
object to delete a document if
you have queried your container for some documents and you want to
delete every document in the results set.
For example:
#include "DbXml.hpp" ... using namespace DbXml; ... // Get a manager object. XmlManager myManager; // Open a container XmlContainer myContainer = myManager.openContainer("exampleData.dbxml"); // Get a query context XmlQueryContext context = myManager.createQueryContext(); // Declare a namespace context.setNamespace("fruits", "http://groceryItem.dbxml/fruits"); // Declare the query string. Find all the product documents // in the fruits namespace. std::string myQuery = "collection('exampleData.dbxml')/fruits:product"; // Perform the query. XmlResults results = myManager.query(myQuery, context); // Delete everything in the results set XmlUpdateContext uc = myManager.createUpdateContext(); XmlDocument theDoc = myManager.createDocument(); while (results.next(theDoc)) { myContainer.deleteDocument(theDoc, uc); }