OW_dbDatabase.cpp

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#include "OW_config.h"
#include "OW_dbDatabase.hpp"
#include "OW_Exception.hpp"
#include "OW_Format.hpp"
#include "OW_UTF8Utils.hpp"
#include "OW_dbUtils.hpp"

#include <db.h>

extern "C" {
static int recCompare(const DBT* key1, const DBT* key2);
}

namespace OW_NAMESPACE
{

dbDatabase::dbDatabase()
   : m_db(0)
{
}

dbDatabase::~dbDatabase()
{
   try
   {
      close();
   }
   catch (...)
   {
   }
}

void dbDatabase::open(const char* name, ::DB_ENV* env, ::DB_TXN* txn, EDuplicateKeysFlag allowDuplicates)
{
   // Create the database handle.
   int ret = ::db_create(&m_db, env, 0);
   dbUtils::checkReturn(ret, "db_create");

   if (allowDuplicates == E_DUPLICATES)
   {
      int ret = m_db->set_flags(m_db, DB_DUP);
      dbUtils::checkReturn(ret, "m_db->set_flags: DB_DUP");
   }

   // Open a database in the environment:
   // create if it doesn't exist
   // free-threaded handle
   // read/write owner only
   ret = m_db->open(m_db, txn, name, NULL, DB_BTREE, DB_CREATE | DB_THREAD, 0600);
   dbUtils::checkReturn(ret, "m_db->open");

}

void dbDatabase::close()
{
   if (m_db != 0)
   {
      int ret = m_db->close(m_db, 0);
      dbUtils::checkReturn(ret, "m_db->close");
      m_db = 0;
   }
}

bool dbDatabase::get(const String& key, std::vector<unsigned char>& data, ::DB_TXN* txn)
{
   DBT dbtkey = {(void*)key.c_str(), key.length(), key.length(), 0, 0, 0 };
   DBT dbtdata = { 0, 0, 0, 0, 0, DB_DBT_USERMEM };
   int ret = m_db->get(m_db, txn, &dbtkey, &dbtdata, 0);
   if (ret == DB_NOTFOUND)
   {
      return false;
   }
   dbUtils::checkReturn(ret, "m_db->get");
   data.resize(dbtdata.size);
   dbtdata.data = &data[0];
   ret = m_db->get(m_db, txn, &dbtkey, &dbtdata, 0);
   dbUtils::checkReturn(ret, "m_db->get");
   return true;
}

void dbDatabase::put(const String& key, const std::vector<unsigned char>& data, ::DB_TXN* txn)
{
   DBT dbtkey = {(void*)key.c_str(), key.length(), key.length(), 0, 0, 0 };
   DBT dbtdata = { (void*)&data[0], data.size(), 0, 0, 0, 0 };
   int ret = m_db->put(m_db, txn, &dbtkey, &dbtdata, 0);
   dbUtils::checkReturn(ret, "m_db->put");
}

} // end namespace OW_NAMESPACE

extern "C" {
static int
OW_dbrecCompare(const ::DBT* key1, const ::DBT* key2)
{
   if (key1->data && key2->data)
   {
      return OpenWBEM::UTF8Utils::compareToIgnoreCase(reinterpret_cast<const char*>(key1->data),
         reinterpret_cast<const char*>(key2->data));
   }
   else if (key1->data && !key2->data)
   {
      return 1;
   }
   else if (!key1->data && key2->data)
   {
      return -1;
   }
   else // key1->data == 0 && key2->data == 0
   {
      return 0;
   }
}
} // extern "C"

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