cpphibernate/include/cpphibernate/driver/mariadb/driver.h

#pragma once

#include "impl/driver_impl.h"

namespace cpphibernate {
namespace mariadb {

    /**
     * @brief Mariadb driver.
     *
     * The normal cpphibernate context will be inherited from this class. So all methods
     * defined here will be part of the context class.
     */
    struct driver_t
    {
    private:
        driver_impl_t               _impl;          //!< Driver implementation.
        ::cppmariadb::connection *  _connection;    //!< Mariadb connection to use for queries.

    public:
        /**
         * @brief Constructor. Initializes the driver with the passed schema.
         *
         * @param[in] p_schema  Schema to use with this driver.
         */
        template<typename T_schema>
        inline driver_t(T_schema&& p_schema);

        /**
         * @brief Constructor. Initializes the driver with the passed schema.
         *
         * @param[in] p_schema      Schema to use with this driver.
         * @param[in] p_connection  Connection to the mariadb server to use for queries.
         */
        template<typename T_schema>
        inline driver_t(T_schema&& p_schema, ::cppmariadb::connection& p_connection);

        /**
         * @brief Print the schema of the driver to the passed stream.
         */
        inline std::ostream& print(std::ostream& os) const;

        /**
         * @brief Get the connection currently assigned to the driver.
         */
        inline ::cppmariadb::connection * connection() const;

        /**
         * @brief Set the connection to use for queries.
         *        This will invalidate all cached queries and strings.
         */
        inline void connection(::cppmariadb::connection * p_connection);

    protected:
        /**
         * @brief Get the imlementation object of the driver.
         */
        inline auto& impl() const;

/*
    public:
        using lock_type = std::unique_ptr<transaction_lock>;

    private:
        ::cppmariadb::connection*   _connection;
        schema_t                    _schema;
        filter_t                    _filter;

    public:
        template<typename T_schema>
        mariadb_driver_t(T_schema&& p_schema)
            : _schema(make_schema(std::forward<T_schema>(p_schema)))
            { }

        cpphibernate_copyable(mariadb_driver_t, delete);
        cpphibernate_moveable(mariadb_driver_t, default);

        inline const ::cppmariadb::connection& connection() const
            { return *_connection; }

        inline void connection(::cppmariadb::connection& p_connection)
            { _connection = &p_connection; }

        template<typename... T_args>
        inline void set_filter_inclusive(T_args&&... args)
            { _filter.set_inclusive(_schema, std::forward<T_args>(args)...); }

        template<typename... T_args>
        inline void set_filter_exclusive(T_args&&... args)
            { _filter.set_exclusive(_schema, std::forward<T_args>(args)...); }

        inline void clear_filter()
            { _filter.clear(); }

        inline lock_type lock()
            { return std::make_unique<transaction_lock>(*_connection); }

        template<typename T_modifiers>
        inline std::string build_query(const std::string& query, T_modifiers&& modifiers) const
        {
            auto where = build_where(_schema, modifiers).query(*_connection);
            std::ostringstream os;
            os << query;
            if (!where.empty())
                os << " " << where;
            return os.str();
        }

    protected:
        inline void init_impl(bool recreate) const
        {
            transaction_lock trans(*_connection);
            _schema.init(init_context(_schema, *_connection, recreate));
            trans.commit();
        }

        template<typename T_dataset>
        inline void create_impl(T_dataset& dataset) const
        {
            create_update_impl_t<T_dataset>::apply(
                create_update_context(dataset, _schema, *_connection, _filter, false));
        }

        template<typename T_dataset, typename T_modifiers>
        inline void read_impl(T_dataset& dataset, T_modifiers&& modifiers) const
        {
            using dataset_type      = mp::decay_t<T_dataset>;
            using real_dataset_type = misc::real_dataset_t<dataset_type>;

            auto  dataset_id = misc::get_type_id(hana::type_c<real_dataset_type>);
            auto& table      = _schema.table(dataset_id);
            auto  context    = make_read_context(dataset, _schema, *_connection, _filter);
            context.where    = build_where(_schema, modifiers).query(*_connection);
            context.limit    = build_limit(modifiers).query(*_connection);
            context.order_by = build_order_by(_schema, modifiers).query(*_connection);

            transaction_lock trans(*_connection);
            table.read(context);
            trans.commit();
        }

        template<typename T_dataset>
        inline void update_impl(T_dataset& dataset) const
        {
            create_update_impl_t<T_dataset>::apply(
                create_update_context(dataset, _schema, *_connection, _filter, true));
        }

        template<typename T_dataset>
        inline void destroy_impl(T_dataset& dataset) const
        {
            using dataset_type      = mp::decay_t<T_dataset>;
            using real_dataset_type = misc::real_dataset_t<dataset_type>;

            auto  dataset_id = misc::get_type_id(hana::type_c<real_dataset_type>);
            auto& table      = _schema.table(dataset_id);

            destroy_context context(dataset, _schema, *_connection);
            context.where = table.get_where_primary_key(context);

            destroy_impl_t<T_dataset>::apply(context);
        }
*/
    };

} }