Merge tag '0.49' into develop

Add get default transaction isolation level function (thanks volka)

_config.yml

@@ -0,0 +1 @@
+theme: jekyll-theme-minimal

connector_api/connection.h

@@ -29,6 +29,7 @@
 
 #include <string>
 #include <sqlpp11/connection.h>
+#include <sqlpp11/transaction.h>
 #include <sqlpp11/database/char_result.h>  // You may use char result or bind result or both
 #include <sqlpp11/database/bind_result.h>  // to represent results of select and prepared select
 
@@ -129,9 +130,20 @@ namespace sqlpp
         return t._prepare(*this);
       }
 
+
+      //! set the transaction isolation level for the current connection
+      /// time of effect is connector-specific, for most is will only affect new transactions
+      void set_default_isolation_level(sqlpp::isolation_level);
+
+      //! read the default transaction isolation level for the current connection
+      sqlpp::isolation_level get_default_isolation_level();
+
       //! start transaction
       void start_transaction();
 
+      //! start transaction with defined isolation level (optional only for connectors that support it)
+      void start_transaction(isolation_level isolation /* = isolation_level::undefined */);
+
       //! commit transaction (or throw transaction if the transaction has been finished already)
       void commit_transaction();
 

include/sqlpp11/connection_pool.h

@@ -0,0 +1,192 @@
+/*
+* Copyright (c) 2013 - 2017, Roland Bock, Frank Park
+* 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 SQLPP_CONNECTION_POOL_H
+#define SQLPP_CONNECTION_POOL_H
+
+#include <mutex>
+#include <stack>
+#include <unordered_map>
+#include <memory>
+#include <iostream>
+#include <chrono>
+#include <type_traits>
+#include <sqlpp11/exception.h>
+#include <sqlpp11/pool_connection.h>
+
+namespace sqlpp
+{
+	namespace reconnect_policy
+	{
+		struct auto_reconnect {
+			template<typename Connection>
+			void operator()(Connection* connection)
+			{
+				if(!connection->is_valid())
+					connection->reconnect()
+			}
+			template<typename Connection>
+			void clean(Connection* connection) {}
+		};
+
+		using namespace std::chrono_literals;
+		class periodic_reconnect
+		{
+		private:
+			std::chrono::seconds revalidate_after;
+			std::unordered_map<void*,std::chrono::time_point<std::chrono::system_clock> > last_checked;
+
+		public:
+			periodic_reconnect(const std::chrono::seconds r = 28800s) //default wait_timeout in MySQL
+				: revalidate_after(r), last_checked() {}
+
+			template<typename Connection>
+			void operator()(Connection* con)
+			{
+				auto last = last_checked.find(con);
+				auto now = std::chrono::system_clock::now();
+				if(last == last_checked.end())
+				{
+					if (!con->is_valid())
+					{
+						con->reconnect();
+					}
+					last_checked.emplace_hint(last, con, now);
+				}
+				else if(now - last->second > revalidate_after)
+				{
+					if (!con->is_valid())
+					{
+						con->reconnect();
+					}
+					last = now;
+				}
+			}
+			template<typename Connection>
+			void clean(Connection* con) {
+				auto itr = last_checked.find(con);
+				if(itr != last_checked.end())
+				{
+					last_checked.erase(itr);
+				}
+			}
+		};
+
+		struct never_reconnect {
+			template<typename Connection>
+			void operator()(Connection*) {}
+			template<typename Connection>
+			void clean(Connection*) {}
+		};
+	}
+
+	template <typename Connection_config,
+		typename Reconnect_policy = reconnect_policy::auto_reconnect,
+		typename Connection = typename std::enable_if<std::is_class<Connection_config::connection>::value, Connection_config::connection>::type>
+	class connection_pool
+	{
+		friend pool_connection<Connection_config, Reconnect_policy, Connection>;
+
+	private:
+		std::mutex connection_pool_mutex;
+		const std::shared_ptr<Connection_config> config;
+		size_t maximum_pool_size = 0;
+		std::stack<std::unique_ptr<Connection>> free_connections;
+		Reconnect_policy reconnect_policy;
+
+		void free_connection(std::unique_ptr<Connection>& connection)
+		{
+			std::lock_guard<std::mutex> lock(connection_pool_mutex);
+			if (free_connections.size() >= maximum_pool_size)
+			{
+				// Exceeds default size, do nothign and let connection self destroy.
+			}
+			else
+			{
+				if (connection.get())
+				{
+					if (connection->is_valid())
+					{
+						free_connections.push(std::move(connection));
+					}
+					else
+					{
+						throw sqlpp::exception("Trying to free a connection with incompatible config.");
+					}
+				}
+				else
+				{
+					throw sqlpp::exception("Trying to free an empty connection.");
+				}
+			}
+		}
+
+	public:
+		connection_pool(const std::shared_ptr<Connection_config>& config, size_t pool_size)
+			: config(config), maximum_pool_size(pool_size), reconnect_policy(Reconnect_policy()) {}
+		~connection_pool() = default;
+		connection_pool(const connection_pool&) = delete;
+		connection_pool(connection_pool&& other)
+			: config(std::move(other.config)), maximum_pool_size(std::move(other.maximum_pool_size)),
+			reconnect_policy(std::move(other.reconnect_policy)) {}
+		connection_pool& operator=(const connection_pool&) = delete;
+		connection_pool& operator=(connection_pool&&) = delete;
+
+		pool_connection<Connection_config, Reconnect_policy, Connection> get_connection()
+		{
+			std::lock_guard<std::mutex> lock(connection_pool_mutex);
+			if (!free_connections.empty())
+			{
+				auto connection = std::move(free_connections.top());
+				free_connections.pop();
+				return pool_connection<Connection_config, Reconnect_policy, Connection>(connection, this);
+			}
+
+			try
+			{
+				return pool_connection<Connection_config, Reconnect_policy, Connection>(std::move(std::make_unique<Connection>(config)), this);
+			}
+			catch (const sqlpp::exception& e)
+			{
+				std::cerr << "Failed to spawn a new connection." << std::endl;
+				std::cerr << e.what() << std::endl;
+				throw;
+			}
+		}
+	};
+
+	template<typename Connection_config,
+		typename Reconnect_policy = reconnect_policy::auto_reconnect,
+		typename Connection = typename std::enable_if<std::is_class<Connection_config::connection>::value,Connection_config::connection>::type>
+	connection_pool<Connection_config, Reconnect_policy, Connection> make_connection_pool(
+		const std::shared_ptr<Connection_config>& config,
+		size_t max_pool_size)
+	{
+		return connection_pool<Connection_config, Reconnect_policy, Connection>(config, max_pool_size);
+	}
+}
+
+#endif

include/sqlpp11/for_update.h

@@ -0,0 +1,179 @@
+/*
+ * Copyright (c) 2017, Serge Robyns
+ * 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 SQLPP_FOR_UPDATE_H
+#define SQLPP_FOR_UPDATE_H
+
+#include <sqlpp11/detail/type_set.h>
+#include <sqlpp11/policy_update.h>
+#include <sqlpp11/type_traits.h>
+
+namespace sqlpp
+{
+  // FOR_UPDATE DATA
+  struct for_update_data_t
+  {
+  };
+
+  // FOR_UPDATE
+  struct for_update_t
+  {
+    using _traits = make_traits<no_value_t, tag::is_for_update>;
+    using _nodes = detail::type_vector<>;
+
+    // Data
+    using _data_t = for_update_data_t;
+
+    // Member implementation with data and methods
+    template <typename Policies>
+    struct _impl_t
+    {
+      // workaround for msvc bug https://connect.microsoft.com/VisualStudio/Feedback/Details/2091069
+      _impl_t() = default;
+      _impl_t(const _data_t& data) : _data(data)
+      {
+      }
+
+      _data_t _data;
+    };
+
+    // Base template to be inherited by the statement
+    template <typename Policies>
+    struct _base_t
+    {
+      using _data_t = for_update_data_t;
+
+      // workaround for msvc bug https://connect.microsoft.com/VisualStudio/Feedback/Details/2091069
+      template <typename... Args>
+      _base_t(Args&&... args) : for_update{std::forward<Args>(args)...}
+      {
+      }
+
+      _impl_t<Policies> for_update;
+      _impl_t<Policies>& operator()()
+      {
+        return for_update;
+      }
+      const _impl_t<Policies>& operator()() const
+      {
+        return for_update;
+      }
+
+      template <typename T>
+      static auto _get_member(T t) -> decltype(t.for_update)
+      {
+        return t.for_update;
+      }
+
+      using _consistency_check = consistent_t;
+    };
+  };
+
+  struct no_for_update_t
+  {
+    using _traits = make_traits<no_value_t, tag::is_noop>;
+    using _nodes = detail::type_vector<>;
+
+    // Data
+    using _data_t = no_data_t;
+
+    // Member implementation with data and methods
+    template <typename Policies>
+    struct _impl_t
+    {
+      // workaround for msvc bug https://connect.microsoft.com/VisualStudio/Feedback/Details/2091069
+      _impl_t() = default;
+      _impl_t(const _data_t& data) : _data(data)
+      {
+      }
+
+      _data_t _data;
+    };
+
+    // Base template to be inherited by the statement
+    template <typename Policies>
+    struct _base_t
+    {
+      using _data_t = no_data_t;
+
+      // workaround for msvc bug https://connect.microsoft.com/VisualStudio/Feedback/Details/2091069
+      template <typename... Args>
+      _base_t(Args&&... args) : no_for_update{std::forward<Args>(args)...}
+      {
+      }
+
+      _impl_t<Policies> no_for_update;
+      _impl_t<Policies>& operator()()
+      {
+        return no_for_update;
+      }
+      const _impl_t<Policies>& operator()() const
+      {
+        return no_for_update;
+      }
+
+      template <typename T>
+      static auto _get_member(T t) -> decltype(t.no_for_update)
+      {
+        return t.no_for_update;
+      }
+
+      using _database_t = typename Policies::_database_t;
+
+      template <typename Check, typename T>
+      using _new_statement_t = new_statement_t<Check, Policies, no_for_update_t, T>;
+
+      using _consistency_check = consistent_t;
+
+      auto for_update() const -> _new_statement_t<consistent_t, for_update_t>
+      {
+        return {static_cast<const derived_statement_t<Policies>&>(*this), for_update_data_t{}};
+      }
+    };
+  };
+
+  // Interpreters
+  template <typename Context>
+  struct serializer_t<Context, for_update_data_t>
+  {
+    using _serialize_check = serialize_check_of<Context>;
+    using T = for_update_data_t;
+
+    static Context& _(const T& t, Context& context)
+    {
+      context << " FOR UPDATE ";
+      return context;
+    }
+  };
+
+  template <typename T>
+  auto for_update(T&& t) -> decltype(statement_t<void, no_for_update_t>().for_update(std::forward<T>(t)))
+  {
+    return statement_t<void, no_for_update_t>().for_update(std::forward<T>(t));
+  }
+}
+
+#endif

include/sqlpp11/pool_connection.h

@@ -0,0 +1,76 @@
+/*
+* Copyright (c) 2013 - 2017, Roland Bock, Frank Park
+* 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 SQLPP_POOL_CONNECTION_H
+#define SQLPP_POOL_CONNECTION_H
+
+#include <memory>
+
+namespace sqlpp
+{
+	template <typename Connection_config, typename Reconnect_policy, typename Connection,
+		typename Connection_pool = connection_pool<Connection_config, Reconnect_policy, Connection>>
+	struct pool_connection
+	{
+	private:
+		std::unique_ptr<Connection> _impl;
+		Connection_pool* origin;
+
+	public:
+		pool_connection(std::unique_ptr<Connection>& connection, Connection_pool* origin)
+			: _impl(std::move(connection)), origin(origin) {}
+
+		~pool_connection()
+		{
+			origin->free_connection(_impl);
+		}
+
+		template<typename... Args>
+		auto operator()(Args&&... args) -> decltype(_impl->args(std::forward<Args>(args)...))
+		{
+			return _impl->args(std::forward<Args>(args)...);
+		}
+
+		template <typename T>
+		auto operator()(const T& t) -> decltype(_impl->run(t))
+		{
+			return _impl->run(t);
+		}
+
+		Connection* operator->()
+		{
+			return &_impl;
+		}
+
+		pool_connection(const pool_connection&) = delete;
+		pool_connection(pool_connection&& other)
+			: _impl(std::move(other._impl)), origin(other.origin) {}
+		pool_connection& operator=(const pool_connection&) = delete;
+		pool_connection& operator=(pool_connection&&) = delete;
+	};
+}
+
+#endif

include/sqlpp11/select.h

@@ -40,6 +40,7 @@
 #include <sqlpp11/having.h>
 #include <sqlpp11/order_by.h>
 #include <sqlpp11/limit.h>
+#include <sqlpp11/for_update.h>
 #include <sqlpp11/offset.h>
 #include <sqlpp11/union.h>
 #include <sqlpp11/expression.h>
@@ -82,7 +83,8 @@ namespace sqlpp
                                      no_order_by_t,
                                      no_limit_t,
                                      no_offset_t,
-                                     no_union_t>;
+                                     no_union_t,
+                                     no_for_update_t>;
 
   inline blank_select_t<void> select()  // FIXME: These should be constexpr
   {

include/sqlpp11/transaction.h

@@ -28,12 +28,21 @@
 #define SQLPP_TRANSACTION_H
 
 #include <stdexcept>
+#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
   {
@@ -48,6 +57,12 @@ namespace sqlpp
       _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&&) = default;
     transaction_t& operator=(const transaction_t&) = delete;
@@ -88,7 +103,13 @@ namespace sqlpp
   template <typename Db>
   transaction_t<Db> start_transaction(Db& db, bool report_unfinished_transaction = report_auto_rollback)
   {
-    return {db, report_unfinished_transaction};
+      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};
   }
 }
 

include/sqlpp11/type_traits.h

@@ -200,6 +200,7 @@ namespace sqlpp
   SQLPP_VALUE_TRAIT_GENERATOR(is_having)
   SQLPP_VALUE_TRAIT_GENERATOR(is_order_by)
   SQLPP_VALUE_TRAIT_GENERATOR(is_limit)
+  SQLPP_VALUE_TRAIT_GENERATOR(is_for_update)
   SQLPP_VALUE_TRAIT_GENERATOR(is_offset)
   SQLPP_VALUE_TRAIT_GENERATOR(is_using_)
   SQLPP_VALUE_TRAIT_GENERATOR(is_column_list)

scripts/ddl2cpp

@@ -204,6 +204,7 @@ types = {
     'integer': 'integer',
     'int': 'integer',
     'serial': 'integer', # PostgreSQL
+    'mediumint' : 'integer',
     'bigint': 'bigint',
     'bigserial': 'bigint', # PostgreSQL
     'char': 'char_',

test_serializer/CMakeLists.txt

@@ -30,6 +30,7 @@ set(test_serializer_names
   Insert
 	TableAlias
   Where
+  ForUpdate
   )
 
 create_test_sourcelist(test_serializer_sources test_serializer_main.cpp ${test_serializer_names})

test_serializer/ForUpdate.cpp

@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2017, Serge Robyns
+ * 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 "compare.h"
+#include "Sample.h"
+#include <sqlpp11/sqlpp11.h>
+
+#include <iostream>
+
+namespace
+{
+  auto getTrue() -> std::string
+  {
+    MockDb::_serializer_context_t printer = {};
+    return serialize(sqlpp::value(true), printer).str();
+  }
+
+  auto getFalse() -> std::string
+  {
+    MockDb::_serializer_context_t printer = {};
+    return serialize(sqlpp::value(false), printer).str();
+  }
+}
+
+int ForUpdate(int, char* [])
+{
+  const auto foo = test::TabFoo{};
+  const auto bar = test::TabBar{};
+
+  // Unconditionally
+  compare(__LINE__, select(foo.omega).from(foo).unconditionally().for_update(), "SELECT tab_foo.omega FROM tab_foo FOR UPDATE ");
+
+  // Never
+  compare(__LINE__, where(sqlpp::value(false)), " WHERE " + getFalse());
+
+
+  return 0;
+}

tests/MockDb.h

@@ -28,12 +28,19 @@
 
 #include <iostream>
 #include <sqlpp11/connection.h>
+#include <sqlpp11/transaction.h>
 #include <sqlpp11/data_types/no_value.h>
 #include <sqlpp11/schema.h>
 #include <sqlpp11/serialize.h>
 #include <sqlpp11/serializer_context.h>
 #include <sstream>
 
+// an object to store internal Mock flags and values to validate in tests
+struct InternalMockData {
+    sqlpp::isolation_level _last_isolation_level;
+    sqlpp::isolation_level _default_isolation_level;
+};
+
 template <bool enforceNullResultTreatment>
 struct MockDbT : public sqlpp::connection
 {
@@ -244,6 +251,38 @@ struct MockDbT : public sqlpp::connection
   {
     return {name};
   }
+
+  void start_transaction()
+  {
+      _mock_data._last_isolation_level = _mock_data._default_isolation_level;
+  }
+
+  void start_transaction(sqlpp::isolation_level level)
+  {
+    _mock_data._last_isolation_level = level;
+  }
+
+  void set_default_isolation_level(sqlpp::isolation_level level)
+  {
+      _mock_data._default_isolation_level = level;
+  }
+
+  sqlpp::isolation_level get_default_isolation_level()
+  {
+      return _mock_data._default_isolation_level;
+  }
+
+  void rollback_transaction(bool)
+  {}
+
+  void commit_transaction()
+  {}
+
+  void report_rollback_failure(std::string)
+  {}
+
+  // temporary data store to verify the expected results were produced
+  InternalMockData _mock_data;
 };
 
 using MockDb = MockDbT<false>;

tests/Select.cpp

@@ -107,6 +107,14 @@ int Select(int, char* [])
     std::cout << a << ", " << b << ", " << g << std::endl;
   }
 
+  for (const auto& row : db(select(all_of(t).as(t), t.gamma).from(t).where(t.alpha > 7).for_update()))
+  {
+    int64_t a = row.tabBar.alpha;
+    const std::string b = row.tabBar.beta;
+    const bool g = row.gamma;
+    std::cout << a << ", " << b << ", " << g << std::endl;
+  }
+
   for (const auto& row :
        db(select(all_of(t), all_of(f)).from(t.join(f).on(t.alpha > f.omega and not t.gamma)).unconditionally()))
   {
@@ -199,5 +207,22 @@ int Select(int, char* [])
     for_each_field(row, to_cerr{});
   }
 
+  {
+      auto transaction = start_transaction(db, sqlpp::isolation_level::read_committed);
+      if (db._mock_data._last_isolation_level != sqlpp::isolation_level::read_committed)
+      {
+          std::cout << "Error: transaction isolation level does not match expected level" << std::endl;
+      }
+
+  }
+  db.set_default_isolation_level(sqlpp::isolation_level::read_uncommitted);
+  {
+      auto transaction = start_transaction(db);
+      if (db._mock_data._last_isolation_level != sqlpp::isolation_level::read_uncommitted)
+      {
+          std::cout << "Error: transaction isolation level does not match default level" << std::endl;
+      }
+  }
+
   return 0;
 }