text: /*
   * Copyright (C) 2005 Tommi Maekitalo
   * 
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   * 
   * As a special exception, you may use this file as part of a free
   * software library without restriction. Specifically, if other files
   * instantiate templates or use macros or inline functions from this
   * file, or you compile this file and link it with other files to
   * produce an executable, this file does not by itself cause the
   * resulting executable to be covered by the GNU General Public
   * License. This exception does not however invalidate any other
   * reasons why the executable file might be covered by the GNU Library
   * General Public License.
   * 
   * This library is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   * 
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
   */
  
  #ifndef TNTDB_TRANSACTION_H
  #define TNTDB_TRANSACTION_H
  
  #include <tntdb/connection.h>
  #include <cxxtools/noncopyable.h>
  
  namespace tntdb
  {
    /**
     * The class Transaction monitors the state of a transaction on a database-conection.
     *
     * The constructor starts by default a transaction on the database. The transactionstate
     * is hold it the class. The destructor rolls the transaction back, when not explicitely
     * commited or rolled back.
     */
    class Transaction : private cxxtools::NonCopyable
    {
        Connection db;
        bool active;
  
      public:
        /**
         * Start a transaction when instructed.
         */
        Transaction(const Connection& db_, bool starttransaction = true);
  
        /**
         * roll back transaction when still active
         */
        ~Transaction();
  
        const Connection& getConnection() const  { return db; }
        Connection& getConnection()              { return db; }
  
        /**
         * Starts a new transaction. If there is a active transaction, it is
         * rolled back first
         */
        void begin();
  
        /**
         * commits the current transaction. If there is no active transaction,
         * then nothing is done. The transactionstate is reset.
         */
        void commit();
  
        /**
         * rolls back the current transaction. If there is no active transaction,
         * then nothing is done. The transactionstate is reset.
         */
        void rollback();
  
        /**
         * Locks the specified table.
         * Locks are released when the transaction is committed or rolled back
         * either explicitly or implicitly by the destructor of the transaction
         * object.
         */
        void lockTable(const std::string& tableName, bool exclusive = true);
    };
  }
  
  #endif // TNTDB_TRANSACTION_H
  
  