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diff --git a/utils/sqlite/transaction.cpp b/utils/sqlite/transaction.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/transaction.hpp"
+
+#include "utils/format/macros.hpp"
+#include "utils/logging/macros.hpp"
+#include "utils/noncopyable.hpp"
+#include "utils/sanity.hpp"
+#include "utils/sqlite/database.hpp"
+#include "utils/sqlite/exceptions.hpp"
+#include "utils/sqlite/statement.ipp"
+
+namespace sqlite = utils::sqlite;
+
+
+/// Internal implementation for the transaction.
+struct utils::sqlite::transaction::impl : utils::noncopyable {
+    /// The database this transaction belongs to.
+    database& db;
+
+    /// Possible statuses of a transaction.
+    enum statuses {
+        open_status,
+        committed_status,
+        rolled_back_status,
+    };
+
+    /// The current status of the transaction.
+    statuses status;
+
+    /// Constructs a new transaction.
+    ///
+    /// \param db_ The database this transaction belongs to.
+    /// \param status_ The status of the new transaction.
+    impl(database& db_, const statuses status_) :
+        db(db_),
+        status(status_)
+    {
+    }
+
+    /// Destroys the transaction.
+    ///
+    /// This rolls back the transaction if it is open.
+    ~impl(void)
+    {
+        if (status == impl::open_status) {
+            try {
+                rollback();
+            } catch (const sqlite::error& e) {
+                LW(F("Error while rolling back a transaction: %s") % e.what());
+            }
+        }
+    }
+
+    /// Commits the transaction.
+    ///
+    /// \throw api_error If there is any problem while committing the
+    ///     transaction.
+    void
+    commit(void)
+    {
+        PRE(status == impl::open_status);
+        db.exec("COMMIT");
+        status = impl::committed_status;
+    }
+
+    /// Rolls the transaction back.
+    ///
+    /// \throw api_error If there is any problem while rolling the
+    ///     transaction back.
+    void
+    rollback(void)
+    {
+        PRE(status == impl::open_status);
+        db.exec("ROLLBACK");
+        status = impl::rolled_back_status;
+    }
+};
+
+
+/// Initializes a transaction object.
+///
+/// This is an internal function.  Use database::begin_transaction() to
+/// instantiate one of these objects.
+///
+/// \param db The database this transaction belongs to.
+sqlite::transaction::transaction(database& db) :
+    _pimpl(new impl(db, impl::open_status))
+{
+}
+
+
+/// Destructor for the transaction.
+sqlite::transaction::~transaction(void)
+{
+}
+
+
+/// Commits the transaction.
+///
+/// \throw api_error If there is any problem while committing the transaction.
+void
+sqlite::transaction::commit(void)
+{
+    _pimpl->commit();
+}
+
+
+/// Rolls the transaction back.
+///
+/// \throw api_error If there is any problem while rolling the transaction back.
+void
+sqlite::transaction::rollback(void)
+{
+    _pimpl->rollback();
+}