sqlpp11/tests/postgresql/usage/Transaction.cpp

/*
 * Copyright (c) 2017, Volker Aßmann
 * 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.
 */

#include <iostream>
#include <memory>
#include <stdexcept>

#include <sqlpp11/alias_provider.h>
#include <sqlpp11/custom_query.h>
#include <sqlpp11/postgresql/connection.h>
#include <sqlpp11/sqlpp11.h>
#include <sqlpp11/transaction.h>

#include "make_test_connection.h"

namespace
{
  std::ostream& operator<<(std::ostream& stream, const sqlpp::isolation_level& level)
  {
    switch (level)
    {
      case sqlpp::isolation_level::serializable:
      {
        stream << "SERIALIZABLE";
        break;
      }
      case sqlpp::isolation_level::repeatable_read:
      {
        stream << "REPEATABLE READ";
        break;
      }
      case sqlpp::isolation_level::read_committed:
      {
        stream << "READ COMMITTED";
        break;
      }
      case sqlpp::isolation_level::read_uncommitted:
      {
        stream << "READ UNCOMMITTED";
        break;
      }
      case sqlpp::isolation_level::undefined:
      {
        stream << "BEGIN";
        break;
      }
    }

    return stream;
  }

  template <typename L, typename R>
  void require_equal(int line, const L& l, const R& r)
  {
    if (l != r)
    {
      std::cerr << line << ": " << l << " != " << r << std::endl;
      throw std::runtime_error("Unexpected result");
    }
  }
}

namespace sql = sqlpp::postgresql;

SQLPP_ALIAS_PROVIDER(level);

int Transaction(int, char*[])
{
  sql::connection db = sql::make_test_connection();

  try
  {

    {
      auto current_level = db(custom_query(sqlpp::verbatim("show transaction_isolation;"))
                                  .with_result_type_of(select(sqlpp::value("").as(level))))
                               .front()
                               .level;
      require_equal(__LINE__, current_level, "read committed");
      std::cerr << "isolation level outside transaction: " << current_level << "\n";

      auto tx = start_transaction(db, sqlpp::isolation_level::serializable);

      current_level = db(custom_query(sqlpp::verbatim("show transaction_isolation;"))
                             .with_result_type_of(select(sqlpp::value("").as(level))))
                          .front()
                          .level;
      require_equal(__LINE__, current_level, "serializable");
      std::cerr << "isolation level in transaction(serializable) : " << current_level << "\n";
      tx.commit();
    }

    require_equal(__LINE__, db.get_default_isolation_level(), sqlpp::isolation_level::read_committed);
    db.set_default_isolation_level(sqlpp::isolation_level::serializable);
    require_equal(__LINE__, db.get_default_isolation_level(), sqlpp::isolation_level::serializable);
  }
  catch (const sqlpp::exception& ex)
  {
    std::cerr << "Got exception: " << ex.what() << std::endl;
    return 1;
  }
  catch (...)
  {
    std::cerr << "Got unknown exception" << std::endl;
    return 1;
  }
  return 0;
}