sqliteimpl.h

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/**********************************************************************
 * LeechCraft - modular cross-platform feature rich internet client.
 * Copyright (C) 2006-2014  Georg Rudoy
 *
 * Distributed under the Boost Software License, Version 1.0.
 * (See accompanying file LICENSE or copy at https://www.boost.org/LICENSE_1_0.txt)
 **********************************************************************/
 
#pragma once
 
#include <util/sll/visitor.h>
#include "oraltypes.h"
#include "oraldetailfwd.h"
#include "impldefs.h"
 
namespace LC::Util::oral::detail::SQLite
{
    using QSqlQuery_ptr = std::shared_ptr<QSqlQuery>;
 
    class InsertQueryBuilder final : public IInsertQueryBuilder
    {
        const QSqlDatabase DB_;
 
        std::array<QSqlQuery_ptr, InsertAction::StaticCount () + 1> Queries_;
        const QString InsertSuffix_;
    public:
        InsertQueryBuilder (const QSqlDatabase& db, const CachedFieldsData& data)
        : DB_ { db }
        , InsertSuffix_ { " INTO " + data.Table_ +
            " (" + data.Fields_.join (", ") + ") VALUES (" +
            data.BoundFields_.join (", ") + ");" }
        {
        }
 
        QSqlQuery_ptr GetQuery (InsertAction action) override
        {
            auto& query = Queries_ [action.Selector_.index ()];
            if (!query)
            {
                query = std::make_shared<QSqlQuery> (DB_);
                query->prepare (GetInsertPrefix (action) + InsertSuffix_);
            }
            return query;
        }
    private:
        QString GetInsertPrefix (InsertAction action)
        {
            return Visit (action.Selector_,
                    [] (InsertAction::DefaultTag) { return "INSERT"; },
                    [] (InsertAction::IgnoreTag) { return "INSERT OR IGNORE"; },
                    [] (InsertAction::Replace) { return "INSERT OR REPLACE"; });
        }
    };
 
    class ImplFactory
    {
    public:
        struct TypeLits
        {
            inline static const QString IntAutoincrement { "INTEGER PRIMARY KEY AUTOINCREMENT" };
            inline static const QString Binary { "BLOB" };
        };
 
        inline static const QString LimitNone { "-1" };
 
        auto MakeInsertQueryBuilder (const QSqlDatabase& db, const CachedFieldsData& data) const
        {
            return std::make_unique<InsertQueryBuilder> (db, data);
        }
    };
}
 
namespace LC::Util::oral
{
    using SQLiteImplFactory = detail::SQLite::ImplFactory;
}