Initial implementation

17 files changed, 955 insertions, 0 deletions

diff --git a/odb/mysql/connection-factory.cxx b/odb/mysql/connection-factory.cxx
new file mode 100644
index 0000000..64fdc57
--- /dev/null
+++ b/odb/mysql/connection-factory.cxx
@@ -0,0 +1,37 @@
+// file      : odb/mysql/connection-factory.cxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2009-2010 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#include <odb/mysql/connection-factory.hxx>
+
+namespace odb
+{
+  namespace mysql
+  {
+    //
+    // connection_factory
+    //
+
+    connection_factory::
+    ~connection_factory ()
+    {
+    }
+
+    //
+    // new_connection_factory
+    //
+
+    shared_ptr<connection> new_connection_factory::
+    connect ()
+    {
+      return shared_ptr<connection> (new (shared) connection (*db_));
+    }
+
+    void new_connection_factory::
+    database (database_type& db)
+    {
+      db_ = &db;
+    }
+  }
+}
diff --git a/odb/mysql/connection-factory.hxx b/odb/mysql/connection-factory.hxx
new file mode 100644
index 0000000..e316f18
--- /dev/null
+++ b/odb/mysql/connection-factory.hxx
@@ -0,0 +1,54 @@
+// file      : odb/mysql/connection-factory.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2009-2010 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef ODB_MYSQL_CONNECTION_FACTORY_HXX
+#define ODB_MYSQL_CONNECTION_FACTORY_HXX
+
+#include <odb/shared-ptr.hxx>
+
+#include <odb/mysql/forward.hxx>
+#include <odb/mysql/connection.hxx>
+
+namespace odb
+{
+  namespace mysql
+  {
+    class connection_factory
+    {
+    public:
+      virtual shared_ptr<connection>
+      connect () = 0;
+
+    public:
+      typedef mysql::database database_type;
+
+      virtual void
+      database (database_type&) = 0;
+
+      virtual
+      ~connection_factory ();
+    };
+
+    class new_connection_factory: public connection_factory
+    {
+    public:
+      new_connection_factory ()
+          : db_ (0)
+      {
+      }
+
+      virtual shared_ptr<connection>
+      connect ();
+
+      virtual void
+      database (database_type&);
+
+    private:
+      database_type* db_;
+    };
+  }
+}
+
+#endif // ODB_MYSQL_CONNECTION_FACTORY_HXX
diff --git a/odb/mysql/connection.cxx b/odb/mysql/connection.cxx
new file mode 100644
index 0000000..9edb814
--- /dev/null
+++ b/odb/mysql/connection.cxx
@@ -0,0 +1,44 @@
+// file      : odb/mysql/connection.cxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2005-2010 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#include <new> // std::bad_alloc
+
+#include <odb/mysql/database.hxx>
+#include <odb/mysql/connection.hxx>
+#include <odb/mysql/exceptions.hxx>
+
+namespace odb
+{
+  namespace mysql
+  {
+    connection::
+    connection (database& db)
+        : handle_ (&mysql_)
+    {
+      if (mysql_init (handle_) == 0)
+        throw std::bad_alloc ();
+
+      if (mysql_real_connect (handle_,
+                              db.host (),
+                              db.user (),
+                              db.passwd (),
+                              db.db (),
+                              db.port (),
+                              db.socket (),
+                              db.client_flags ()) == 0)
+      {
+        database_exception e (handle_);
+        mysql_close (handle_);
+        throw e;
+      }
+    }
+
+    connection::
+    ~connection ()
+    {
+      mysql_close (handle_);
+    }
+  }
+}
diff --git a/odb/mysql/connection.hxx b/odb/mysql/connection.hxx
new file mode 100644
index 0000000..e0f44a3
--- /dev/null
+++ b/odb/mysql/connection.hxx
@@ -0,0 +1,44 @@
+// file      : odb/mysql/connection.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2005-2010 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef ODB_MYSQL_CONNECTION_HXX
+#define ODB_MYSQL_CONNECTION_HXX
+
+#include <mysql/mysql.h>
+
+#include <odb/forward.hxx>
+#include <odb/shared-ptr.hxx>
+
+namespace odb
+{
+  namespace mysql
+  {
+    class connection: public shared_base
+    {
+    public:
+      connection (database&);
+
+      virtual
+      ~connection ();
+
+    public:
+      MYSQL*
+      handle ()
+      {
+        return handle_;
+      }
+
+    private:
+      connection (const connection&);
+      connection& operator= (const connection&);
+
+    private:
+      MYSQL mysql_;
+      MYSQL* handle_;
+    };
+  }
+}
+
+#endif // ODB_MYSQL_CONNECTION_HXX
diff --git a/odb/mysql/database.cxx b/odb/mysql/database.cxx
new file mode 100644
index 0000000..7902bcf
--- /dev/null
+++ b/odb/mysql/database.cxx
@@ -0,0 +1,174 @@
+// file      : odb/mysql/database.cxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2009-2010 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#include <odb/session.hxx>
+#include <odb/transaction.hxx>
+
+#include <odb/mysql/database.hxx>
+#include <odb/mysql/connection-factory.hxx>
+
+using namespace std;
+
+namespace odb
+{
+  namespace mysql
+  {
+    database::
+    ~database ()
+    {
+    }
+
+    database::
+    database (const char* user,
+              const char* passwd,
+              const char* db,
+              const char* host,
+              unsigned int port,
+              const char* socket,
+              unsigned long client_flags,
+              auto_ptr<connection_factory> factory)
+        : user_ (user ? user : ""),
+          passwd_str_ (passwd ? passwd : ""),
+          passwd_ (passwd ? passwd_str_.c_str () : 0),
+          db_ (db ? db : ""),
+          host_ (host ? host : ""),
+          port_ (port),
+          socket_str_ (socket ? socket : ""),
+          socket_ (socket ? socket_str_.c_str () : 0),
+          client_flags_ (client_flags),
+          factory_ (factory)
+    {
+      if (factory_.get () == 0)
+        factory_.reset (new new_connection_factory ());
+
+      factory_->database (*this);
+    }
+
+    database::
+    database (const string& user,
+              const string& passwd,
+              const string& db,
+              const string& host,
+              unsigned int port,
+              const string* socket,
+              unsigned long client_flags,
+              auto_ptr<connection_factory> factory)
+        : user_ (user),
+          passwd_str_ (passwd),
+          passwd_ (passwd_str_.c_str ()),
+          db_ (db),
+          host_ (host),
+          port_ (port),
+          socket_str_ (socket ? *socket : ""),
+          socket_ (socket ? socket_str_.c_str () : 0),
+          client_flags_ (client_flags),
+          factory_ (factory)
+    {
+      if (factory_.get () == 0)
+        factory_.reset (new new_connection_factory ());
+
+      factory_->database (*this);
+    }
+
+    database::
+    database (const string& user,
+              const string* passwd,
+              const string& db,
+              const string& host,
+              unsigned int port,
+              const string* socket,
+              unsigned long client_flags,
+              auto_ptr<connection_factory> factory)
+        : user_ (user),
+          passwd_str_ (passwd ? *passwd : ""),
+          passwd_ (passwd ? passwd_str_.c_str () : 0),
+          db_ (db),
+          host_ (host),
+          port_ (port),
+          socket_str_ (socket ? *socket : ""),
+          socket_ (socket ? socket_str_.c_str () : 0),
+          client_flags_ (client_flags),
+          factory_ (factory)
+    {
+      if (factory_.get () == 0)
+        factory_.reset (new new_connection_factory ());
+
+      factory_->database (*this);
+    }
+
+    database::
+    database (const string& user,
+              const string& passwd,
+              const string& db,
+              const string& host,
+              unsigned int port,
+              const string& socket,
+              unsigned long client_flags,
+              auto_ptr<connection_factory> factory)
+        : user_ (user),
+          passwd_str_ (passwd),
+          passwd_ (passwd_str_.c_str ()),
+          db_ (db),
+          host_ (host),
+          port_ (port),
+          socket_str_ (socket),
+          socket_ (socket_str_.c_str ()),
+          client_flags_ (client_flags),
+          factory_ (factory)
+    {
+      if (factory_.get () == 0)
+        factory_.reset (new new_connection_factory ());
+
+      factory_->database (*this);
+    }
+
+    database::
+    database (const string& user,
+              const string* passwd,
+              const string& db,
+              const string& host,
+              unsigned int port,
+              const string& socket,
+              unsigned long client_flags,
+              auto_ptr<connection_factory> factory)
+        : user_ (user),
+          passwd_str_ (passwd ? *passwd : ""),
+          passwd_ (passwd ? passwd_str_.c_str () : 0),
+          db_ (db),
+          host_ (host),
+          port_ (port),
+          socket_str_ (socket),
+          socket_ (socket_str_.c_str ()),
+          client_flags_ (client_flags),
+          factory_ (factory)
+    {
+      if (factory_.get () == 0)
+        factory_.reset (new new_connection_factory ());
+
+      factory_->database (*this);
+    }
+
+    transaction_impl* database::
+    begin_transaction ()
+    {
+      if (odb::transaction::has_current ())
+        throw already_in_transaction ();
+
+      if (session::has_current ())
+        return new transaction_impl (*this, session::current ());
+      else
+        return new transaction_impl (*this);
+    }
+
+    transaction_impl* database::
+    begin_transaction (session& s)
+    {
+      if (odb::transaction::has_current ())
+        throw already_in_transaction ();
+
+      return new transaction_impl (*this, s);
+    }
+  }
+}
diff --git a/odb/mysql/database.hxx b/odb/mysql/database.hxx
new file mode 100644
index 0000000..be939a7
--- /dev/null
+++ b/odb/mysql/database.hxx
@@ -0,0 +1,160 @@
+// file      : odb/mysql/database.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2009-2010 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef ODB_MYSQL_DATABASE_HXX
+#define ODB_MYSQL_DATABASE_HXX
+
+#include <string>
+#include <memory> // std::auto_ptr
+
+#include <mysql/mysql.h>
+
+#include <odb/shared-ptr.hxx>
+#include <odb/database.hxx>
+
+#include <odb/mysql/forward.hxx>
+#include <odb/mysql/connection.hxx>
+#include <odb/mysql/connection-factory.hxx>
+#include <odb/mysql/transaction-impl.hxx>
+
+namespace odb
+{
+  namespace mysql
+  {
+    class database: public odb::database
+    {
+    public:
+      typedef mysql::connection connection_type;
+
+    public:
+      // In MySQL NULL and empty string are treated as the same value
+      // for all the arguments except passwd and socket.
+      //
+      database (const char* user,
+                const char* passwd,
+                const char* db,
+                const char* host = 0,
+                unsigned int port = 0,
+                const char* socket = 0,
+                unsigned long client_flags = 0,
+                std::auto_ptr<connection_factory> =
+                  std::auto_ptr<connection_factory> (0));
+
+      database (const std::string& user,
+                const std::string& passwd,
+                const std::string& db,
+                const std::string& host = "",
+                unsigned int port = 0,
+                const std::string* socket = 0,
+                unsigned long client_flags = 0,
+                std::auto_ptr<connection_factory> =
+                  std::auto_ptr<connection_factory> (0));
+
+      database (const std::string& user,
+                const std::string* passwd,
+                const std::string& db,
+                const std::string& host = "",
+                unsigned int port = 0,
+                const std::string* socket = 0,
+                unsigned long client_flags = 0,
+                std::auto_ptr<connection_factory> =
+                  std::auto_ptr<connection_factory> (0));
+
+      database (const std::string& user,
+                const std::string& passwd,
+                const std::string& db,
+                const std::string& host,
+                unsigned int port,
+                const std::string& socket,
+                unsigned long client_flags = 0,
+                std::auto_ptr<connection_factory> =
+                  std::auto_ptr<connection_factory> (0));
+
+      database (const std::string& user,
+                const std::string* passwd,
+                const std::string& db,
+                const std::string& host,
+                unsigned int port,
+                const std::string& socket,
+                unsigned long client_flags = 0,
+                std::auto_ptr<connection_factory> =
+                  std::auto_ptr<connection_factory> (0));
+
+    public:
+      const char*
+      user () const
+      {
+        return user_.c_str ();
+      }
+
+      const char*
+      passwd () const
+      {
+        return passwd_;
+      }
+
+      const char*
+      db () const
+      {
+        return db_.c_str ();
+      }
+
+      const char*
+      host () const
+      {
+        return host_.c_str ();
+      }
+
+      unsigned int
+      port () const
+      {
+        return port_;
+      }
+
+      const char*
+      socket () const
+      {
+        return socket_;
+      }
+
+      unsigned long
+      client_flags () const
+      {
+        return client_flags_;
+      }
+
+    public:
+      virtual transaction_impl*
+      begin_transaction ();
+
+      virtual transaction_impl*
+      begin_transaction (session&);
+
+    public:
+      shared_ptr<connection_type>
+      connection ();
+
+    public:
+      virtual
+      ~database ();
+
+    private:
+      const std::string user_;
+      const std::string passwd_str_;
+      const char* passwd_;
+      const std::string db_;
+      const std::string host_;
+      unsigned int port_;
+      const std::string socket_str_;
+      const char* socket_;
+      unsigned long client_flags_;
+      std::auto_ptr<connection_factory> factory_;
+    };
+  }
+}
+
+#include <odb/mysql/database.ixx>
+
+#endif // ODB_MYSQL_DATABASE_HXX
diff --git a/odb/mysql/database.ixx b/odb/mysql/database.ixx
new file mode 100644
index 0000000..8d927b5
--- /dev/null
+++ b/odb/mysql/database.ixx
@@ -0,0 +1,16 @@
+// file      : odb/mysql/database.ixx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2009-2010 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+namespace odb
+{
+  namespace mysql
+  {
+    inline shared_ptr<database::connection_type> database::
+    connection ()
+    {
+      return factory_->connect ();
+    }
+  }
+}
diff --git a/odb/mysql/exceptions.cxx b/odb/mysql/exceptions.cxx
new file mode 100644
index 0000000..4ee80fb
--- /dev/null
+++ b/odb/mysql/exceptions.cxx
@@ -0,0 +1,38 @@
+// file      : odb/mysql/exceptions.cxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2005-2010 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#include <sstream>
+
+#include <odb/mysql/exceptions.hxx>
+
+using namespace std;
+
+namespace odb
+{
+  namespace mysql
+  {
+    database_exception::
+    ~database_exception () throw ()
+    {
+    }
+
+    database_exception::
+    database_exception (MYSQL* h)
+        : error_ (mysql_errno (h)),
+          sqlstate_ (mysql_sqlstate (h)),
+          message_ (mysql_error (h))
+    {
+      ostringstream ostr;
+      ostr << error_ << " (" << sqlstate_ << "): " << message_;
+      what_ = ostr.str ();
+    }
+
+    char const* database_exception::
+    what () const throw ()
+    {
+      return what_.c_str ();
+    }
+  }
+}
diff --git a/odb/mysql/exceptions.hxx b/odb/mysql/exceptions.hxx
new file mode 100644
index 0000000..a4e729b
--- /dev/null
+++ b/odb/mysql/exceptions.hxx
@@ -0,0 +1,54 @@
+// file      : odb/mysql/exceptions.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2005-2010 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef ODB_MYSQL_EXCEPTIONS_HXX
+#define ODB_MYSQL_EXCEPTIONS_HXX
+
+#include <string>
+
+#include <mysql/mysql.h>
+
+#include <odb/exceptions.hxx>
+
+namespace odb
+{
+  namespace mysql
+  {
+    struct database_exception: odb::database_exception
+    {
+      database_exception (MYSQL*);
+      ~database_exception () throw ();
+
+      unsigned int
+      error () const
+      {
+        return error_;
+      }
+
+      const std::string&
+      sqlstate () const
+      {
+        return sqlstate_;
+      }
+
+      const std::string&
+      message () const
+      {
+        return message_;
+      }
+
+      virtual char const*
+      what () const throw ();
+
+    private:
+      unsigned int error_;
+      std::string sqlstate_;
+      std::string message_;
+      std::string what_;
+    };
+  }
+}
+
+#endif // ODB_MYSQL_EXCEPTIONS_HXX
diff --git a/odb/mysql/forward.hxx b/odb/mysql/forward.hxx
new file mode 100644
index 0000000..41baa1c
--- /dev/null
+++ b/odb/mysql/forward.hxx
@@ -0,0 +1,20 @@
+// file      : odb/mysql/forward.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2005-2010 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef ODB_MYSQL_FORWARD_HXX
+#define ODB_MYSQL_FORWARD_HXX
+
+namespace odb
+{
+  namespace mysql
+  {
+    class database;
+    class connection;
+    class connection_factory;
+    class transaction;
+  }
+}
+
+#endif // ODB_MYSQL_FORWARD_HXX
diff --git a/odb/mysql/makefile b/odb/mysql/makefile
new file mode 100644
index 0000000..ce2204e
--- /dev/null
+++ b/odb/mysql/makefile
@@ -0,0 +1,68 @@
+# file      : odb/mysql/makefile
+# author    : Boris Kolpackov <boris@codesynthesis.com>
+# copyright : Copyright (c) 2009-2010 Code Synthesis Tools CC
+# license   : GNU GPL v2; see accompanying LICENSE file
+
+include $(dir $(lastword $(MAKEFILE_LIST)))../../build/bootstrap.make
+
+cxx_tun   :=           \
+connection.cxx         \
+connection-factory.cxx \
+database.cxx           \
+exceptions.cxx         \
+transaction.cxx        \
+transaction-impl.cxx
+
+cxx_obj   := $(addprefix $(out_base)/,$(cxx_tun:.cxx=.o))
+cxx_od    := $(cxx_obj:.o=.o.d)
+
+odb_mysql.l             := $(out_base)/odb-mysql.l
+odb_mysql.l.cpp-options := $(out_base)/odb-mysql.l.cpp-options
+
+default   := $(out_base)/
+install   := $(out_base)/.install
+clean     := $(out_base)/.clean
+
+# Import.
+#
+$(call import,\
+  $(scf_root)/import/libodb/stub.make,\
+  l: odb.l,cpp-options: odb.l.cpp-options)
+
+$(call import,\
+  $(scf_root)/import/libmysqlclient/stub.make,\
+  l: mysql.l,cpp-options: mysql.l.cpp-options)
+
+# Build.
+#
+$(odb_mysql.l): $(cxx_obj) $(odb.l) $(mysql.l)
+$(odb_mysql.l.cpp-options): value := -I$(src_root)
+$(odb_mysql.l.cpp-options): $(odb.l.cpp-options) $(mysql.l.cpp-options)
+
+$(cxx_obj) $(cxx_od): $(odb_mysql.l.cpp-options)
+
+$(call include-dep,$(cxx_od))
+
+# Convenience alias for default target.
+#
+$(out_base)/: $(odb_mysql.l)
+
+# Install.
+#
+$(install): $(odb_mysql.l)
+	$(call install-lib,$<,$(install_lib_dir)/$(ld_lib_prefix)odb-mysql$(ld_lib_suffix))
+	$(call install-dir,$(src_base),$(install_inc_dir)/odb/mysql,\
+'(' -name '*.hxx' -o -name '*.ixx' -o -name '*.txx' ')')
+
+# Clean.
+#
+$(clean): $(odb_mysql.l).o.clean    \
+  $(odb_mysql.l.cpp-options).clean  \
+  $(addsuffix .cxx.clean,$(cxx_obj)) \
+  $(addsuffix .cxx.clean,$(cxx_od))
+
+# How to.
+#
+$(call include,$(bld_root)/cxx/o-l.make)
+$(call include,$(bld_root)/cxx/cxx-o.make)
+$(call include,$(bld_root)/cxx/cxx-d.make)
diff --git a/odb/mysql/transaction-impl.cxx b/odb/mysql/transaction-impl.cxx
new file mode 100644
index 0000000..fde19de
--- /dev/null
+++ b/odb/mysql/transaction-impl.cxx
@@ -0,0 +1,60 @@
+// file      : odb/mysql/transaction-impl.cxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2009-2010 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#include <mysql/mysql.h>
+
+#include <odb/mysql/database.hxx>
+#include <odb/mysql/connection.hxx>
+#include <odb/mysql/exceptions.hxx>
+#include <odb/mysql/transaction-impl.hxx>
+
+namespace odb
+{
+  namespace mysql
+  {
+    transaction_impl::
+    transaction_impl (database_type& db)
+        : odb::transaction_impl (db), connection_ (db.connection ())
+    {
+      MYSQL* h (connection_->handle ());
+
+      if (mysql_real_query (h, "begin", 5) != 0)
+        throw database_exception (h);
+    }
+
+    transaction_impl::
+    transaction_impl (database_type& db, session_type& s)
+        : odb::transaction_impl (db, s), connection_ (db.connection ())
+    {
+      MYSQL* h (connection_->handle ());
+
+      if (mysql_real_query (h, "begin", 5) != 0)
+        throw database_exception (h);
+    }
+
+    transaction_impl::
+    ~transaction_impl ()
+    {
+    }
+
+    void transaction_impl::
+    commit ()
+    {
+      MYSQL* h (connection_->handle ());
+
+      if (mysql_real_query (h, "commit", 6) != 0)
+        throw database_exception (h);
+    }
+
+    void transaction_impl::
+    rollback ()
+    {
+      MYSQL* h (connection_->handle ());
+
+      if (mysql_real_query (h, "rollback", 8) != 0)
+        throw database_exception (h);
+    }
+  }
+}
diff --git a/odb/mysql/transaction-impl.hxx b/odb/mysql/transaction-impl.hxx
new file mode 100644
index 0000000..1e611b8
--- /dev/null
+++ b/odb/mysql/transaction-impl.hxx
@@ -0,0 +1,50 @@
+// file      : odb/mysql/transaction-impl.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2009-2010 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef ODB_MYSQL_TRANSACTION_IMPL_HXX
+#define ODB_MYSQL_TRANSACTION_IMPL_HXX
+
+#include <odb/shared-ptr.hxx>
+#include <odb/transaction.hxx>
+
+#include <odb/mysql/forward.hxx>
+
+namespace odb
+{
+  namespace mysql
+  {
+    class transaction_impl: public odb::transaction_impl
+    {
+    protected:
+      friend class database;
+      friend class transaction;
+
+      typedef mysql::database database_type;
+      typedef mysql::connection connection_type;
+
+      transaction_impl (database_type&);
+      transaction_impl (database_type&, session_type&);
+
+      virtual
+      ~transaction_impl ();
+
+      virtual void
+      commit ();
+
+      virtual void
+      rollback ();
+
+      connection_type&
+      connection ();
+
+    private:
+      shared_ptr<connection_type> connection_;
+    };
+  }
+}
+
+#include <odb/mysql/transaction-impl.ixx>
+
+#endif // ODB_MYSQL_TRANSACTION_IMPL_HXX
diff --git a/odb/mysql/transaction-impl.ixx b/odb/mysql/transaction-impl.ixx
new file mode 100644
index 0000000..5f022d7
--- /dev/null
+++ b/odb/mysql/transaction-impl.ixx
@@ -0,0 +1,16 @@
+// file      : odb/mysql/transaction-impl.ixx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2009-2010 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+namespace odb
+{
+  namespace mysql
+  {
+    inline transaction_impl::connection_type& transaction_impl::
+    connection ()
+    {
+      return *connection_;
+    }
+  }
+}
diff --git a/odb/mysql/transaction.cxx b/odb/mysql/transaction.cxx
new file mode 100644
index 0000000..ac8cd04
--- /dev/null
+++ b/odb/mysql/transaction.cxx
@@ -0,0 +1,26 @@
+// file      : odb/mysql/transaction.cxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2009-2010 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#include <odb/mysql/transaction.hxx>
+
+namespace odb
+{
+  namespace mysql
+  {
+    transaction& transaction::
+    current ()
+    {
+      // While the impl type can be of the concrete type, the transaction
+      // object can be created as either odb:: or odb::mysql:: type. To
+      // work around that we are going to hard-cast one two the other
+      // relying on the fact that they have the same representation and
+      // no virtual functions. The former is checked in the tests.
+      //
+      odb::transaction& b (odb::transaction::current ());
+      dynamic_cast<transaction_impl&> (b.implementation ());
+      return reinterpret_cast<transaction&> (b);
+    }
+  }
+}
diff --git a/odb/mysql/transaction.hxx b/odb/mysql/transaction.hxx
new file mode 100644
index 0000000..ebb62b3
--- /dev/null
+++ b/odb/mysql/transaction.hxx
@@ -0,0 +1,53 @@
+// file      : odb/mysql/transaction.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2009-2010 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef ODB_MYSQL_TRANSACTION_HXX
+#define ODB_MYSQL_TRANSACTION_HXX
+
+#include <odb/transaction.hxx>
+
+#include <odb/mysql/forward.hxx>
+
+namespace odb
+{
+  namespace mysql
+  {
+    class transaction_impl;
+
+    class transaction: public odb::transaction
+    {
+    public:
+      typedef mysql::database database_type;
+      typedef mysql::connection connection_type;
+
+      explicit
+      transaction (transaction_impl*);
+
+      // Return the database this transaction is on.
+      //
+      database_type&
+      database ();
+
+      // Return the underlying database connection for this transaction.
+      //
+      connection_type&
+      connection ();
+
+      // Return current transaction or throw if there is no transaction
+      // in effect.
+      //
+      static transaction&
+      current ();
+
+    public:
+      transaction_impl&
+      implementation ();
+    };
+  }
+}
+
+#include <odb/mysql/transaction.ixx>
+
+#endif // ODB_MYSQL_TRANSACTION_HXX
diff --git a/odb/mysql/transaction.ixx b/odb/mysql/transaction.ixx
new file mode 100644
index 0000000..d4f7cc8
--- /dev/null
+++ b/odb/mysql/transaction.ixx
@@ -0,0 +1,41 @@
+// file      : odb/mysql/transaction.ixx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2009-2010 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#include <odb/mysql/database.hxx>
+#include <odb/mysql/transaction-impl.hxx>
+
+namespace odb
+{
+  namespace mysql
+  {
+    inline transaction::
+    transaction (transaction_impl* impl)
+        : odb::transaction (impl)
+    {
+    }
+
+    inline transaction::database_type& transaction::
+    database ()
+    {
+      return static_cast<database_type&> (odb::transaction::database ());
+    }
+
+    inline transaction::connection_type& transaction::
+    connection ()
+    {
+      return implementation ().connection ();
+    }
+
+    inline transaction_impl& transaction::
+    implementation ()
+    {
+      // We can use static_cast here since we have an instance of
+      // mysql::transaction.
+      //
+      return static_cast<transaction_impl&> (
+        odb::transaction::implementation ());
+    }
+  }
+}