text: /*
   * Copyright (c) 2013-2015, Roland Bock
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without modification,
   * are permitted provided that the following conditions are met:
   *
   *   Redistributions of source code must retain the above copyright notice, this
   *   list of conditions and the following disclaimer.
   *
   *   Redistributions in binary form must reproduce the above copyright notice, this
   *   list of conditions and the following disclaimer in the documentation and/or
   *   other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
   * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
   * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #ifndef SQLPP11_TRANSACTION_H
  #define SQLPP11_TRANSACTION_H
  
  #include <stdexcept>
  #include <string>
  #include <ciso646>
  
  namespace sqlpp
  {
    static constexpr bool quiet_auto_rollback = false;
    static constexpr bool report_auto_rollback = true;
  
    enum class isolation_level
    {
      undefined,        // use the current database default
      serializable,     // highest level, stronguest guarantee
      repeatable_read,  // DBMS holds read and write locks
      read_committed,   // DMBS holds read locks, non-repeatable reads can occur
      read_uncommitted  // lowest isolation level, dirty reads may occur
    };
  
    template <typename Db>
    class transaction_t
    {
      Db& _db;
      const bool _report_unfinished_transaction;
      bool _finished = false;
  
    public:
      transaction_t(Db& db, bool report_unfinished_transaction)
          : _db(db), _report_unfinished_transaction(report_unfinished_transaction)
      {
        _db.start_transaction();
      }
  
      transaction_t(Db& db, bool report_unfinished_transaction, isolation_level isolation)
          : _db(db), _report_unfinished_transaction(report_unfinished_transaction)
      {
        _db.start_transaction(isolation);
      }
  
      transaction_t(const transaction_t&) = delete;
      transaction_t(transaction_t&& other)
          : _db(other._db), _report_unfinished_transaction(other._report_unfinished_transaction), _finished(other._finished)
      {
          other._finished = true;
      }
  
      transaction_t& operator=(const transaction_t&) = delete;
      transaction_t& operator=(transaction_t&&) = delete;
  
      ~transaction_t()
      {
        if (not _finished)
        {
          try
          {
            _db.rollback_transaction(_report_unfinished_transaction);
          }
          catch (const std::exception& e)
          {
            _db.report_rollback_failure(std::string("auto rollback failed: ") + e.what());
          }
          catch (...)
          {
            _db.report_rollback_failure("auto rollback failed with unknown exception");
          }
        }
      }
  
      void commit()
      {
        _finished = true;
        _db.commit_transaction();
      }
  
      void rollback()
      {
        _finished = true;
        _db.rollback_transaction(false);
      }
    };
  
    template <typename Db>
    transaction_t<Db> start_transaction(Db& db, bool report_unfinished_transaction = report_auto_rollback)
    {
      return {db, report_unfinished_transaction};
    }
  
    template <typename Db>
    transaction_t<Db> start_transaction(Db& db,
                                        isolation_level isolation,
                                        bool report_unfinished_transaction = report_auto_rollback)
    {
      return {db, report_unfinished_transaction, isolation};
    }
  }  // namespace sqlpp
  
  #endif
  