/**
* Main method of the example class.
*
* @param args (ignored) command-line arguments
* @throws Exception exception
*/
public static void main(final String[] args) throws Exception {
System.out.println("=== XMLDBQuery ===\n");
System.out.println("* Run query via XML:DB:");
// Collection instance
Collection coll = null;
try {
// Register the database
Class<?> c = Class.forName(DRIVER);
Database db = (Database) c.newInstance();
DatabaseManager.registerDatabase(db);
// Receive the database
coll = DatabaseManager.getCollection(DBNAME);
// Receive the XPath query service
XPathQueryService service = (XPathQueryService) coll.getService("XPathQueryService", "1.0");
// Execute the query and receives all results
ResourceSet set = service.query(QUERY);
// Create a result iterator
ResourceIterator iter = set.getIterator();
// Loop through all result items
while (iter.hasMoreResources()) {
// Receive the next results
Resource res = iter.nextResource();
// Write the result to the console
System.out.println(res.getContent());
}
} catch (final XMLDBException ex) {
// Handle exceptions
System.err.println("XML:DB Exception occured " + ex.errorCode);
} finally {
// Close the collection
if (coll != null) coll.close();
}
}
/**
* This method performs an XPath query to the database and returns the results as a Vector of
* Strings.
*
* @param collection The name of the collection to look for the document.
* @param query A string containing an XPath expression which shall act as a query against the
* database.
* @param username The identifier of the user calling the method used for authentication.
* @param password The password of the user calling the method used for authentication.
* @return A Vector containing the answers to the query as Strings.
*/
public Vector query(String collection, String query, String username, String password) {
Vector response = new Vector();
try {
Class cl = Class.forName(_driver);
Database database = (Database) cl.newInstance();
DatabaseManager.registerDatabase(database);
Collection col = DatabaseManager.getCollection(_URI + collection, username, password);
XPathQueryService service = (XPathQueryService) col.getService("XPathQueryService", "1.0");
service.setProperty("indent", "yes");
ResourceSet result = service.query(query);
ResourceIterator i = result.getIterator();
while (i.hasMoreResources()) {
Resource r = i.nextResource();
response.add((String) r.getContent());
}
} catch (Exception e) {
e.printStackTrace();
}
return response;
}
