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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.
+
+/// \file utils/sqlite/database.hpp
+/// Wrapper classes and utilities for the SQLite database state.
+///
+/// This module contains thin RAII wrappers around the SQLite 3 structures
+/// representing the database, and lightweight.
+
+#if !defined(UTILS_SQLITE_DATABASE_HPP)
+#define UTILS_SQLITE_DATABASE_HPP
+
+#include "utils/sqlite/database_fwd.hpp"
+
+extern "C" {
+#include <stdint.h>
+}
+
+#include <cstddef>
+#include <memory>
+
+#include "utils/fs/path_fwd.hpp"
+#include "utils/optional_fwd.hpp"
+#include "utils/sqlite/c_gate_fwd.hpp"
+#include "utils/sqlite/statement_fwd.hpp"
+#include "utils/sqlite/transaction_fwd.hpp"
+
+namespace utils {
+namespace sqlite {
+
+
+/// Constant for the database::open flags: open in read-only mode.
+static const int open_readonly = 1 << 0;
+/// Constant for the database::open flags: open in read-write mode.
+static const int open_readwrite = 1 << 1;
+/// Constant for the database::open flags: create on open.
+static const int open_create = 1 << 2;
+
+
+/// A RAII model for the SQLite 3 database.
+///
+/// This class holds the database of the SQLite 3 interface during its existence
+/// and provides wrappers around several SQLite 3 library functions that operate
+/// on such database.
+///
+/// These wrapper functions differ from the C versions in that they use the
+/// implicit database hold by the class, they use C++ types where appropriate
+/// and they use exceptions to report errors.
+///
+/// The wrappers intend to be as lightweight as possible but, in some
+/// situations, they are pretty complex because of the workarounds needed to
+/// make the SQLite 3 more C++ friendly.  We prefer a clean C++ interface over
+/// optimal efficiency, so this is OK.
+class database {
+    struct impl;
+
+    /// Pointer to the shared internal implementation.
+    std::shared_ptr< impl > _pimpl;
+
+    friend class database_c_gate;
+    database(const utils::optional< utils::fs::path >&, void*, const bool);
+    void* raw_database(void);
+
+public:
+    ~database(void);
+
+    static database in_memory(void);
+    static database open(const fs::path&, int);
+    static database temporary(void);
+    void close(void);
+
+    const utils::optional< utils::fs::path >& db_filename(void) const;
+
+    void exec(const std::string&);
+
+    transaction begin_transaction(void);
+    statement create_statement(const std::string&);
+
+    int64_t last_insert_rowid(void);
+};
+
+
+}  // namespace sqlite
+}  // namespace utils
+
+#endif  // !defined(UTILS_SQLITE_DATABASE_HPP)