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diff --git a/utils/sqlite/c_gate.cpp b/utils/sqlite/c_gate.cpp
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+// Copyright 2011 The Kyua Authors.
+// 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.
+// * Neither the name of Google Inc. nor the names of its contributors
+//   may be used to endorse or promote products derived from this software
+//   without specific prior written permission.
+//
+// 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
+// OWNER 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 "utils/sqlite/c_gate.hpp"
+
+#include "utils/fs/path.hpp"
+#include "utils/optional.ipp"
+#include "utils/sqlite/database.hpp"
+
+namespace sqlite = utils::sqlite;
+
+using utils::none;
+
+
+/// Creates a new gateway to an existing C++ SQLite database.
+///
+/// \param database_ The database to connect to.  This object must remain alive
+///     while the newly-constructed database_c_gate is alive.
+sqlite::database_c_gate::database_c_gate(database& database_) :
+    _database(database_)
+{
+}
+
+
+/// Destructor.
+///
+/// Destroying this object has no implications on the life cycle of the SQLite
+/// database.  Only the corresponding database object controls when the SQLite 3
+/// database is closed.
+sqlite::database_c_gate::~database_c_gate(void)
+{
+}
+
+
+/// Creates a C++ database for a C SQLite 3 database.
+///
+/// \warning The created database object does NOT own the C database.  You must
+/// take care to properly destroy the input sqlite3 when you are done with it to
+/// not leak resources.
+///
+/// \param raw_database The raw database to wrap temporarily.
+///
+/// \return The wrapped database without strong ownership on the input database.
+sqlite::database
+sqlite::database_c_gate::connect(::sqlite3* raw_database)
+{
+    return database(none, static_cast< void* >(raw_database), false);
+}
+
+
+/// Returns the C native SQLite 3 database.
+///
+/// \return A native sqlite3 object holding the SQLite 3 C API database.
+::sqlite3*
+sqlite::database_c_gate::c_database(void)
+{
+    return static_cast< ::sqlite3* >(_database.raw_database());
+}