lmdbal/table.h

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// Squawk messenger.
// Copyright (C) 2019 Yury Gubich <blue@macaw.me>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
#ifndef CORE_TABLE_H
#define CORE_TABLE_H
#include "database.h"
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#include "serializer.h"
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class DataBase::_Table {
friend class DataBase;
protected:
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_Table(const std::string& name, DataBase* parent);
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virtual ~_Table();
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virtual int createTable(MDB_txn * transaction) = 0;
virtual int drop(MDB_txn * transaction);
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public:
virtual void drop();
virtual uint32_t count() const;
protected:
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MDB_dbi dbi;
DataBase* db;
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const std::string name;
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protected:
template <class T>
int makeTable(MDB_txn* transaction);
template <class T>
static std::string toString(const T& value);
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};
template <class K, class V>
class DataBase::Table : public DataBase::_Table {
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friend class DataBase;
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protected:
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Table(const std::string& name, DataBase* parent);
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~Table() override;
public:
using DataBase::_Table::drop;
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virtual void addRecord(const K& key, const V& value);
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virtual bool forceRecord(const K& key, const V& value); //returns true if there was addition, false if change
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virtual void changeRecord(const K& key, const V& value);
virtual void removeRecord(const K& key);
virtual bool checkRecord(const K& key) const; //checks if there is a record with given key
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virtual V getRecord(const K& key) const;
virtual std::map<K, V> readAll() const;
virtual void replaceAll(const std::map<K, V>& data);
virtual uint32_t addRecords(const std::map<K, V>& data, bool overwrite = false);
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protected:
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Serializer<K>* keySerializer;
Serializer<V>* valueSerializer;
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int createTable(MDB_txn* transaction) override;
};
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#include "table.hpp"
#endif // CORE_TABLE_H