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/core/name/create_name_tag.h>
#include <sqlpp11/core/query/query/custom_query.h>
#include <sqlpp11/postgresql/database/connection.h>
#include <sqlpp11/sqlpp11.h>
#include <sqlpp11/core/database/transaction.h>
#include "../../include/test_helpers.h"

#include "make_test_connection.h"

namespace sql = sqlpp::postgresql;

SQLPP_CREATE_NAME_TAG(level);

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

  try
  {

    {
      require_equal(__LINE__, db.is_transaction_active(), false);
      auto current_level = std::string(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);
      require_equal(__LINE__, db.is_transaction_active(), true);
      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.is_transaction_active(), false);
    }

    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;
}