void getDetails( XmlTransaction &txn, XmlManager &mgr, const XmlContainer &container, const std::string &query, XmlQueryContext &context )
{
////////////////////////////////////////////////////////////////////////
////// Performs an query (in context) against the ///////
////// provided container. ///////
////////////////////////////////////////////////////////////////////////
///// some defensive code eliminated for clarity //
// Perform the query. Result type is by default Result Document
std::string fullQuery = "collection('" + container.getName() + "')" + query;
try {
std::cout << "Exercising query '" << fullQuery << "' " << std::endl;
std::cout << "Return to continue: ";
getc(stdin);
XmlResults results( mgr.query( txn, fullQuery, context ) );
XmlValue value;
std::cout << "\n\tProduct : Price : Inventory Level\n";
while( results.next(value) ) {
/// Retrieve the value as a document
XmlDocument theDocument = value.asDocument();
/// Obtain information of interest from the document. Note that the
// wildcard in the query expression allows us to not worry about what
// namespace this document uses.
std::string item = getValue( txn, mgr, theDocument, "fn:string(/*/product)", context);
std::string price = getValue( txn, mgr, theDocument, "fn:string(/*/inventory/price)", context);
std::string inventory = getValue( txn, mgr, theDocument, "fn:string(/*/inventory/inventory)", context);
std::cout << "\t" << item << " : " << price << " : " << inventory << std::endl;
}
std::cout << "\n";
std::cout << (unsigned int) results.size()
<< " objects returned for expression '"
<< fullQuery << "'\n" << std::endl;
}
//Catches XmlException
catch(std::exception &e) {
std::cerr << "Query " << fullQuery << " failed\n";
std::cerr << e.what() << "\n";
txn.abort();
exit(-1);
}
}
void doQuery( XmlTransaction &txn, XmlManager &db, const XmlContainer &container, const std::string &query )
{
////////////////////////////////////////////////////////////////////////
////// Performs a simple query (no context) against the ///////
////// provided container. ///////
////////////////////////////////////////////////////////////////////////
///// some defensive code eliminated for clarity //
// Perform the query. Result type is by default Result Document
std::string fullQuery = "collection('" + container.getName() + "')" + query;
try {
std::cout << "Exercising query '" << fullQuery << "' " << std::endl;
std::cout << "Return to continue: ";
getc(stdin);
XmlQueryContext context = db.createQueryContext();
XmlResults results( db.query( txn, fullQuery, context) );
XmlValue value;
while( results.next(value) ) {
// Obtain the value as a string and print it to stdout
std::cout << value.asString() << std::endl;
}
std::cout << (unsigned int) results.size()
<< " objects returned for expression '"
<< fullQuery << "'\n" << std::endl;
}
catch(XmlException &e) {
std::cerr << "Query " << fullQuery << " failed\n";
std::cerr << e.what() << "\n";
txn.abort();
exit( -1 );
}
catch(std::exception &e) {
std::cerr << "Query " << fullQuery << " failed\n";
std::cerr << e.what() << "\n";
txn.abort();
exit( -1 );
}
}
int main(int argc, char **argv)
{
std::string path2DbEnv;
std::string theContainer = "namespaceExampleData.dbxml";
for ( int i=1; i<argc; i++ )
{
if ( argv[i][0] == '-' )
{
switch(argv[i][1])
{
case 'h':
path2DbEnv = argv[++i];
break;
default:
usage();
}
}
}
if (! path2DbEnv.length() )
usage();
// Berkeley DB environment flags
u_int32_t envFlags = DB_RECOVER|DB_CREATE|DB_INIT_MPOOL|
DB_INIT_LOCK|DB_INIT_TXN|DB_INIT_LOG;
// Berkeley DB cache size (64 MB). The default is quite small
u_int32_t envCacheSize = 64*1024*1024;
// Create and open a Berkeley DB Transactional Environment.
int dberr;
DB_ENV *dbEnv = 0;
dberr = db_env_create(&dbEnv, 0);
if (dberr == 0) {
dbEnv->set_cachesize(dbEnv, 0, envCacheSize, 1);
dberr = dbEnv->open(dbEnv, path2DbEnv.c_str(), envFlags, 0);
}
if (dberr) {
std::cout << "Unable to create environment handle due to the following error: " <<
db_strerror(dberr) << std::endl;
if (dbEnv) dbEnv->close(dbEnv, 0);
return -1;
}
//Have the XmlManager adopt the db environment
XmlManager mgr(dbEnv, DBXML_ADOPT_DBENV);
//Configure the container to use transactions
XmlContainerConfig config;
config.setTransactional(true);
//Open a container in the db environment
XmlContainer container = mgr.openContainer(theContainer, config);
//create a transaction
XmlTransaction txn = mgr.createTransaction();
//create a context and declare the namespaces
XmlQueryContext context = mgr.createQueryContext();
context.setNamespace( "fruits", "http://groceryItem.dbxml/fruits");
context.setNamespace( "vegetables", "http://groceryItem.dbxml/vegetables");
context.setNamespace( "desserts", "http://groceryItem.dbxml/desserts");
//Query for documents by their document names.
doContextQuery( txn, mgr, container.getName(),
"/*[dbxml:metadata('dbxml:name')='ZuluNut.xml']", context );
doContextQuery( txn, mgr, container.getName(),
"/*[dbxml:metadata('dbxml:name')='TrifleOrange.xml']", context );
doContextQuery( txn, mgr, container.getName(),
"/*[dbxml:metadata('dbxml:name')='TriCountyProduce.xml']", context );
//Get the document from the container using the document name
doGetDocument(txn, container, "ZuluNut.xml");
doGetDocument(txn, container, "TrifleOrange.xml");
doGetDocument(txn, container, "TriCountyProduce.xml");
//commit the transaction
txn.commit();
return 0;
}
/**
* @breif
* Put a file to dbxml database, if there already
* had the file in db, check the time stamp to decide if
* update needed.
*
* @Param pathname
* the path of the file
* @Param docname
* The doc name in the dbxml database
*
* @Returns
* return no_error for success
* otherwise an XmlException was throwed
*/
BdRetVal bdbXMLInterface::add_files(const string& pathname, const string& docname)
{
XmlContainer* container = NULL;
if (m_manager == NULL)
{
throw XmlException(XmlException::NULL_POINTER, "n_manager NULL", __FILE__, __LINE__);
}
debugOut() << "try file: " << pathname << endl;
QString q_pathname(pathname.c_str());
for (int i = 0; i < CONT_IDX_NUM; i ++)
{
QString q_cont_name("database/");
q_cont_name += (container_names[i].c_str());
q_cont_name += "/";
if (q_pathname.contains(q_cont_name, Qt::CaseInsensitive))
{
container = &m_containers[i];
}
}
if (container == NULL)
{
throw XmlException(XmlException::NULL_POINTER, "container NULL", __FILE__, __LINE__);
}
XmlUpdateContext the_context = m_manager->createUpdateContext();
try{
XmlDocument the_doc = container->getDocument(docname);
//
container->deleteDocument(the_doc, the_context);
}
catch (XmlException &e)
{
// debugOut() << "open document xml exception: " << e.what() << " file name: " << docname << endl;
if (e.getExceptionCode() != XmlException::DOCUMENT_NOT_FOUND)
{
throw e;
}
}
debugOut() << "putting file: " << pathname << " to container " << container->getName() <<
" as doc " << docname << endl;
try
{
XmlInputStream *the_stream =
m_manager->createLocalFileInputStream(pathname);
container->putDocument(docname,
the_stream,
the_context,
0);
}
catch (XmlException &e)
{
debugOut() << "xml exception: " << e.what() << endl;
throw e;
}
return no_error;
}
