db-stl-example.cpp

#include "db_map.h" // Berkeley DB's STL Map support

using namespace dbstl;

main()
{
  std::string key = "hello";
  int value = 1234;
  Db *dbp = NULL;
  DbEnv *envp = NULL;
  typedef db_multimap<char *, int, ElementHolder<int> > strmap_t;

  envp = new DbEnv( ... );
  dbp = new Db(envp, ... );

  dbstl::dbstl_startup(); 
  dbstl::register_db(dbp);
  dbstl::register_db_env(envp);

  strmap_t *strmap = new strmap_t(dbp, envp);

  txn = dbstl::begin_txn(0, envp);

  strmap->insert(key, value);

  try {
    dbstl::commit_txn(envp);
  } catch (DbException &e) {
    std::cout << "Error on txn commit: " << e.what() << std::endl;
    dbstl::abort_txn(envp);
    return FAILURE;
  }
  dbstl::commit_txn(envp);

  return SUCCESS;
}

int
count_records(strmap_t *strmap)
{
  int count = 0;
  strmap_t::iterator itr;
  try {
    for (itr = strmap->begin(); itr != strmap->end(); ++itr)
      count++;
  } catch (DbDeadlockException &de) {
    std::cerr << "countRecords: deadlock" << std::endl;
    throw de;
  } catch (DbException &e) {
    std::cerr << "countRecords: error" << std::endl;
    std::cerr << e.what() << std::endl;
  }
  // itr's DB cursor is closed when the itr is destructed

  return (count);
}